Bidirectional balance type lamp anti-fog device and vehicle lamp

Abstract

The utility model discloses a bi-directional balance type lamp anti-fog device which comprises a lamp shell (1), one-way valves which are paired and opposite in through-flow direction are installed on the lamp shell (1) in a sealed mode so that the corresponding one-way valves can be opened through the internal and external pressure difference of the lamp shell (1) to achieve ventilation. The inlet part (6) of each one-way valve is provided with a first breathable waterproof and dustproof film (8), and the first breathable waterproof and dustproof film (8) has elasticity so that the fluid entering direction can be changed through elastic deformation. In addition, the utility model further discloses a vehicle lamp. The technical problem of fog prevention of the automobile lamp is thoroughly and effectively solved, and the service life of the automobile lamp is prolonged.

Description

Technical Field

[0001] The utility model relates to a lamp anti-fog device, in particular to a two-way balanced lamp anti-fog device. In addition, the utility model also relates to a vehicle lamp. Background Art

[0002] Lamps, especially vehicle lamps, are often used in humid environments. The anti-fog problem of vehicle lamps has always been a major technical problem that has plagued the lighting industry. Water vapor can penetrate almost anywhere, and various technical measures are almost unable to effectively solve the problem.

[0003] At present, in the lighting industry, the mainstream anti-fog technologies for headlights mainly include:

[0004] First, air convection is used (for example, vent holes, breathable membranes, and other structures are provided on the lamp housing) to reduce the temperature difference between the inside and outside of the lamp, thereby reducing the conditions for fog formation.

[0005] Second, the principle of moisture absorption is used (for example, a desiccant is placed inside the lamp) to reduce the humidity inside the lamp, thereby reducing the conditions for fog formation.

[0006] Third, through surface treatment technology (super hydrophilic coating), the conditions for fog condensation on the surface of the lamp are reduced.

[0007] However, the above three anti-fog methods for headlights have obvious disadvantages. Among them, (1) the air convection method requires a certain shielding structure because the lamp is required to be waterproof and dustproof, and the air flow is not smooth, and high-efficiency air convection cannot be achieved. At the same time, the air convection method easily brings moisture from the outside of the lamp into the inside of the lamp, thereby further aggravating the fogging phenomenon; (2) Using the principle of moisture absorption for anti-fog, although it can solve the fogging problem of the lamp by reducing the humidity of the air, since the desiccant is a chemical reaction and belongs to a one-way irreversible conversion, the fogging problem of the lamp cannot be solved after the desiccant fails; (3) Using surface treatment technology, although it can reduce the possibility of fog condensation by changing the surface tension of the lamp surface material, as the moisture inside the lamp increases, when the super-hydrophilic coating is saturated with water, the water film on the surface of the lamp is more likely to produce the negative impact of water film flow.

[0008] In addition to the above three anti-fog technologies, in recent years, some technologies have been proposed to start from controlling the water vapor content inside the lamp and design relevant anti-fog structures for vehicle lamps. For example, Chinese Patent CN110118336A has proposed a technical solution to control the water vapor content through a pressure-relief type sealing structure. However, when the pressure inside the vehicle lamp is relatively high and ventilation is required, the sealing structure is broken and external air enters. After ventilation, the sealing structure resumes sealing. However, after the external air enters, especially in a humid use environment, the water vapor that enters cannot be discharged at all due to the restoration of the sealing structure, resulting in a worse performance of the vehicle lamp and being unable to achieve the goals of dust and water protection for the lamp and controlling the water vapor content inside the lamp at all. In particular, this type of vehicle lamp using a pressure-relief type sealing structure has a short service life, often breaks for unknown reasons, and has extremely poor performance. However, the existing technical means cannot find out the cause at all and there is no way to solve it. This has formed a technical inertia among those skilled in the art in the anti-fog technology of vehicle lamps, and generally the pressure-relief type sealing technical means are no longer adopted.

[0009] In summary, the current anti-fog technologies for lamps cannot effectively solve the problem of lamp fogging, which has become a technical problem in the field of vehicle lamps. In view of this, it is necessary to design a more scientific and effective anti-fog structure for vehicle lamps. Utility Model Content

[0010] The technical problem to be solved by the present utility model is to provide a two-way balanced lamp anti-fog device and its vehicle lamp, which can not only effectively solve the anti-fog problem of the vehicle lamp, but also extend the service life of the vehicle lamp.

[0011] To solve the above technical problem, the present utility model provides a two-way balanced lamp anti-fog device, including a lamp housing. It is characterized in that a pair of one-way valves with opposite flow directions are hermetically installed on the lamp housing, so as to be able to open the corresponding one-way valve through the pressure difference inside and outside the lamp housing to achieve ventilation. A first breathable, waterproof and dustproof film is installed at the inlet part of each one-way valve, and the first breathable, waterproof and dustproof film has elasticity, so as to be able to change the fluid inlet direction through elastic deformation.

[0012] Preferably, a second breathable, waterproof and dustproof film is installed at the outlet part of each one-way valve, and the second breathable, waterproof and dustproof film has elasticity, so as to be able to change the fluid outflow direction through elastic deformation.

[0013] More preferably, the internal flow channels of each one-way valve are formed into a plurality of flow branches at least at both ends.

[0014] Specifically, the one-way valve includes a valve body hermetically connected to the lamp housing. A valve core is movably installed in the valve core cavity of the valve body. Circumferential flanges that contact the inner peripheral surface of the valve core cavity are respectively formed on the outer peripheries of both end portions of the valve core. A plurality of flow passages are formed through the circumferential flanges along the length direction of the valve core at circumferentially spaced intervals.

[0015] More specifically, a spring is provided between the valve core and the valve body. The valve core is pressed against the inlet portion by the elastic pressure of the spring, so that the sealing portion of the valve core forms a sealing contact with the circumferential sealing rib of the inlet portion.

[0016] Particularly preferably, the distribution density of the filter micropores on the first breathable, waterproof and dustproof membrane and the second breathable, waterproof and dustproof membrane decreases from the central region to the edge region.

[0017] Particularly preferably, the pore diameter of the filter micropores on the first breathable, waterproof and dustproof membrane and the second breathable, waterproof and dustproof membrane increases from the central region to the edge region.

[0018] Typically, the first breathable, waterproof and dustproof membrane and the second breathable, waterproof and dustproof membrane are Gore-Tex membranes.

[0019] Preferably, the first breathable, waterproof and dustproof membrane and the second breathable, waterproof and dustproof membrane are detachably fixed to the one-way valve.

[0020] In addition, the present invention also provides a vehicle lamp, which includes the two-way balanced lamp anti-fog device according to any one of the above technical solutions.

[0021] The two-way balanced anti-fog device of the present invention uses a two-way balanced structure to cleverly solve the air exchange problem under positive pressure and negative pressure of the vehicle lamp, greatly extending the service life of the vehicle lamp. At the same time, by providing an elastic waterproof and dustproof membrane and cleverly using the elasticity of the waterproof and dustproof membrane to change the flow direction of the fluid, it effectively prevents water vapor from entering the interior of the vehicle lamp due to various reasons during the air exchange process, controls the water content of the air inside the lamp, so as to achieve the purpose of preventing water vapor inside the lamp from condensing into fog, and solves the technical problems of the prior art. The two-way balanced lamp anti-fog device of the present invention can be widely applied to various lamp lighting industries, especially suitable for the vehicle lamp lighting industry, and effectively solves problems such as the decline of lighting performance and service life caused by fogging of the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional structural view of the two-way balanced lamp anti-fog device in the specific embodiment of the present invention;

[0023] Figure 2 is Figure 1Exploded structural schematic diagram of the two-way balanced anti-fog device for lamps

[0024] Figure 3 is Figure 1 Stereoscopic structural schematic diagram of the two-way balanced anti-fog device for lamps observed in one direction

[0025] Figure 4 is Figure 1 Stereoscopic structural schematic diagram of the two-way balanced anti-fog device for lamps observed in the other direction

[0026] Figure 5 Stereoscopic structural schematic diagram of the valve core of the two-way balanced anti-fog device for lamps of the present utility model

[0027] Figure 6 Stereoscopic structural schematic diagram of the inlet part of the two-way balanced anti-fog device for lamps of the present utility model

[0028] Explanation of the reference numerals in the drawings of the present utility model

[0029] 1 Lamp housing 2 Sealing ring

[0030] 3 Valve body 4 Sealing part

[0031] 5 Valve core 5a Flow-through branch channel

[0032] 5b Circumferential flange 6 Inlet part

[0033] 6a Circumferential sealing rib 7 Spring

[0034] 8 First breathable, dust-proof and waterproof film 9 Second breathable, dust-proof and waterproof film Specific embodiments

[0035] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present utility model, and are not intended to limit the present utility model.

[0036] First of all, it should be noted that although in the description of the specific embodiments of the present utility model below, descriptions such as "part" are used, such as the inlet part, the outlet part, and the sealing part, these parts can either be formed as separate components and fixed to the valve body or the valve core by means of welding, bonding, etc., or be integrally formed, and these obvious variant forms all fall within the protection scope of the present utility model.

[0037] In the research and development process of the present utility model, regarding the anti-fog technology of the pressure-relievable sealing structure, those skilled in the art have long been unable to find the reasons for the significant shortening of the service life of the lamps and their easy damage. Therefore, the research and development team of this project has carried out a large number of trial productions and studies. Even in the test process, there have been situations where some lamps inexplicably burst. This inexplicable bursting has made the test infeasible. In order to find the reasons, the research and development team has expanded the research scope and conducted a large number of tests in terms of temperature, pressure, stress, materials, etc. Finally, it is found that the existing pressure-relievable sealing structure mainly functions under positive pressure, that is, in the sealed state of the lamp, due to reasons such as the lamp emitting light and heat and the use environment, the pressure inside the lamp increases. That is, when the pressure inside the lamp is greater than the ambient air pressure (positive pressure), ventilation is carried out. However, in some other environments of the lamp, such as when the external use environment temperature is relatively high, a negative pressure will also appear inside the lamp, that is, when the pressure inside the lamp is less than the ambient air pressure. At this time, ventilation cannot be effectively carried out to balance the pressure difference inside and outside the lamp. When the structural strength of the lamp is insufficient to support the pressure difference inside and outside, it will cause the lamp to be damaged and the service life of the lamp to be shortened. In addition, during the ventilation process, due to convection, the humid use environment, accidental reasons, etc., the air entering the lamp inevitably contains a large amount of water vapor, but it is very difficult to control the water vapor during this ventilation process.

[0038] See Figure 1 , through a large number of studies and trial productions, the two-way balanced lamp anti-fog device in the basic implementation mode of the present utility model includes a lamp housing 1. Among them, a pair of one-way valves with opposite flow directions are hermetically installed on the lamp housing 1 so as to be able to open the corresponding one-way valve through the pressure difference inside and outside the lamp housing 1 to achieve ventilation. A first breathable, waterproof and dustproof film 8 is installed at the inlet part 6 of each one-way valve. The first breathable, waterproof and dustproof film 8 has elasticity so as to be able to change the fluid inlet direction through elastic deformation.

[0039] In the above basic embodiment, the utility model found the cause of the damaged lamp through a lot of time, and uniquely set one-way valves with opposite flow directions. When the positive pressure or negative pressure exceeding the threshold appears in the lamp, the corresponding one-way valve opens to ventilate with the external environment, achieving pressure balance and avoiding lamp damage or affecting the service life. Under this technical measure of two-way pressure change, although the lamp is normally in a fully sealed state, during the ventilation process, even when ventilating with positive pressure, due to the humid use environment, convection or accidental reasons, the water vapor in the external air will inevitably enter the interior of the lamp. In addition, during the negative pressure ventilation process, the external air directly enters the interior of the lamp. How to control the water vapor is a very difficult problem. Therefore, the R & D team of the utility model fixes the first breathable waterproof and dustproof film 8 at the inlet part 6 of the one-way valve. The waterproof and dustproof film itself has the performance of waterproofing and dustproofing, but it is still not enough for the lamp to prevent fog. The R & D team of the utility model has carried out a large number of fluid simulation tests, conducted a large number of experiments, and used various waterproof and dustproof films. Finally, it is found that the waterproof and dustproof film has elasticity and can completely and effectively prevent water vapor from entering and control the moisture content. Through microscopic photography observation, the principle is mainly that during the ventilation process, due to the pressure difference, the waterproof and dustproof film will elastically deform. This elastic deformation will make the filter surface of the waterproof and dustproof film form an arc shape, and thus make the micropores on the waterproof and dustproof film twist and deform into micropores with irregular internal microstructures. And for the water vapor in the air, the water molecules themselves are heavier and have binding properties with each other. When passing through the waterproof and dustproof film, due to the twisting and deformation of the micropores, the flow direction of the fluid changes, the water molecules are blocked and aggregated and then precipitate from the surface of the waterproof and dustproof film. When the quantity is large, even water droplets will slide off. Through use tests, it is confirmed that the two-way balanced lamp anti-fog structure in the basic embodiment of the utility model can still control the air moisture content in the lamp well even when used in a very humid environment, and the pressure in the lamp can be controlled relatively accurately, the service life is significantly extended, and there is no phenomenon of unknown damage.

[0040] See Figures 1 to 6 , as a preferred embodiment, a second breathable waterproof and dustproof film 9 is also installed at the outlet part of each one-way valve. The second breathable waterproof and dustproof film 9 has elasticity so as to be able to change the fluid outflow direction through elastic deformation. The setting of the second breathable waterproof and dustproof film 9 further enhances the reliability of waterproof and dustproof, and more reliably achieves the purpose of controlling the moisture content in the air. The principle is the same as that of the above first waterproof and dustproof film 9, and will not be elaborated here.

[0041] Typically, the first breathable, waterproof and dustproof membrane 8 and the second breathable, waterproof and dustproof membrane 9 can be made of common Gore membranes (such as commercially available GORE-TEX Gore membranes on the market), or of course, other types of waterproof and dustproof membranes can also be used. Generally speaking, the breathable, waterproof and dustproof membranes of the present utility model are elastic membranes with pore diameters larger than gas molecules in the air (such as oxygen and / or nitrogen molecules) and smaller than condensed water droplets.

[0042] As a preferred structural form, refer to Figure 5 , the internal flow channels of each one-way valve are formed into multiple flow branches 5a at least at both ends. Specifically, the one-way valve may include a valve body 3 (through a sealing ring 2) sealedly connected to the lamp housing 1. A valve core 5 is movably installed in the valve core cavity of the valve body 3. Circumferential flanges 5b that contact the inner peripheral surface of the valve core cavity are respectively formed on the outer peripheries of both end portions of the valve core 5. A plurality of the flow branches 5a distributed at circumferential intervals are formed through the circumferential flanges along the length direction of the valve core. This design of the dispersed flow branches 5a can effectively disperse the fluid impact on the first waterproof and dustproof membrane 8 and the second waterproof and dustproof membrane 9, and extend the service life of the waterproof and dustproof membranes.

[0043] More specifically, a spring 7 is provided between the valve core 5 and the valve body 3. The valve core 5 is pressed against the inlet portion by the elastic pressure of the spring, so that the sealing portion 4 of the valve core 5 forms a sealing contact with the circumferential sealing rib 6a of the inlet portion. This sealing structural form makes the sealing reliability better under normal sealing conditions, and avoids accidental entry of water vapor into the lamp interior due to unreliable sealing.

[0044] Due to the elastic deformation of the waterproof and dustproof membranes of the present utility model, it is necessary to balance the breathable smoothness and the waterproof and dustproof performance of the waterproof and dustproof membranes. Therefore, the project team of the present utility model has carried out a large number of optimized designs on the waterproof and dustproof membranes. Research has confirmed that the distribution density of the filter micropores on the first breathable, waterproof and dustproof membrane 8 and the second breathable, waterproof and dustproof membrane 9 decreases from the central region to the edge region; or the pore diameters of the filter micropores on the first breathable, waterproof and dustproof membrane 8 and the second breathable, waterproof and dustproof membrane 9 increase from the central region to the edge region. This preferred technical solution has the best use effect in practice. Due to the elastic deformation of the waterproof and dustproof membranes, the central region deforms the most, and the edge region deforms relatively less. This structural arrangement enables the waterproof and dustproof membranes to not only have better waterproof and dustproof functions during the elastic deformation process, but also make the filtration more balanced and the breathability better.

[0045] In addition, for the convenience of lamp maintenance, the first breathable, waterproof and dustproof film 8 and the second breathable, waterproof and dustproof film 9 are both detachably fixed to the one-way valve. Due to the special structural design of the breathable, waterproof and dustproof film of the present utility model, its general service life can be replaced simultaneously with the life of the vehicle tire. This structural design facilitates the replacement of the waterproof and dustproof film in case of accidental damage under special circumstances.

[0046] Furthermore, the present utility model also provides a vehicle lamp, wherein the vehicle lamp includes the two-way balanced lamp anti-fog device described in any of the above technical solutions.

[0047] The two-way balanced lamp anti-fog device of the present utility model and its vehicle lamp are described above in a hierarchical and progressive manner. For the convenience of understanding the present utility model, the following refers to Figures 1 to 6 to describe a relatively preferred and comprehensive specific embodiment of the present utility model.

[0048] See Figures 1 to 6 . Regarding the basic elements of water vapor condensation, the present utility model starts from controlling the water vapor content of the air inside the lamp, so that the air inside the lamp can never reach the saturated water vapor pressure, and thus the air inside the air cannot condense into fog. The two-way balanced lamp anti-fog device of the present utility model includes a valve body 3, a valve core 5, a first breathable, waterproof and dustproof film 8 and a second breathable, waterproof and dustproof film 9. The two-way balanced lamp anti-fog device is arranged on the lamp housing 1 and is in a tightly sealed connection state with the lamp housing 1 through a sealing ring 2. In the initial state of lamp assembly, under the action of the built-in spring 7, the sealing part 4 of the valve core 5 of the two-way balanced lamp anti-fog device is closely attached to the circumferential sealing rib 6a of the inlet part 6 of the valve body 3, thus being in a sealed state. Since the operating temperature range of the lamp is very large, when the temperature inside the lamp rises, the gas inside the lamp is heated and extruded to form a high-pressure state. At this time, the air pressure inside the lamp overcomes the pressure of the spring 7, pushes open the sealing part 4, and discharges the compressed gas inside the lamp through the flow passage 5a of the valve core 5, so as to achieve the effect of balancing the pressure inside and outside the lamp. During the process of the high-pressure gas inside the lamp pushing open the valve core 5, in order to prevent dust, impurities or moisture accumulated at the inlet part 6 from entering the lamp interior during long-term use, the first breathable, waterproof and dustproof film 8 and the second breathable, waterproof and dustproof film 9 are respectively arranged at the ends of the valve body 3, the inlet part 6 and the outlet part. Moreover, the first breathable, waterproof and dustproof film 8 and the second breathable, waterproof and dustproof film 9 are elastic and can elastically deform to change the fluid direction, so that the lamp has unexpected waterproof and dustproof performance. Structures or components (such as sponge and other microporous components) equivalent to the waterproof and dustproof film are regarded as equivalent structures by the present utility model and are used on the valve body 3 and the valve port to achieve the dustproof and waterproof functions.

[0049] The valve core 5 is arranged inside the valve body 3 and can slide freely. The sealing part 4 is assembled at the end of the valve core 5 and is connected to the valve core 5 as a whole by means of tight fitting or bonding. Under the action of the spring 7, the sealing part 4 of the valve core 5 is in close contact with the inlet part 6 to achieve the sealing effect. The inlet part 6 and the valve body 3 are combined as a whole by means of welding or bonding. Shallow grooves are respectively formed on the end faces of the valve body 3, the inlet part 6 and the outlet part for installing the first breathable waterproof and dustproof film 8 and the second breathable waterproof and dustproof film 8. The waterproof and dustproof film is assembled in the end face grooves of the valve body 3, the inlet part 6 and the outlet part by means of bonding or welding. After the two-way balanced lamp anti-fog device of the present utility model is assembled on the lamp housing 1 by means of screws or welding, the lamp is isolated from the outside air by the sealing combination formed by the sealing ring 2 and the sealing part 4. After the lamp assembly is completed, the water vapor content of the air inside the lamp is locked due to the sealing effect of the two-way balanced lamp anti-fog device of the present utility model. When the lamp is heated by lighting inside the lamp, the air inside the lamp expands due to heat. Since the lamp is sealed by the anti-fog air pressure balance device, the pressure inside the lamp gradually increases. When the air pressure inside the lamp rises high enough to resist the elastic force of the spring 7, the sealing part 4 is pushed up by the air pressure inside the lamp, so that the gas inside the lamp is discharged to achieve the purpose of releasing the pressure inside the lamp. After the pressure inside the lamp decreases, the sealing part 4 is tightly pressed against the circumferential sealing rib 6a arranged at the valve port 6 under the action of the spring 7 to form a sealing effect again.

[0050] Similarly, the two-way balanced lamp anti-fog device of the present utility model further includes a one-way valve reversely installed on the lamp housing 1. When the air pressure inside the lamp body decreases to such an extent that the pressure difference between the inside and outside of the lamp is sufficient to overcome the elastic force of the spring force 7, the sealing part 4 is pushed up by the air pressure outside the lamp, so that the pressure difference between the inside and outside of the lamp is reduced. Since the waterproof and dustproof films are arranged at both ends of the anti-fog air pressure balance device of the present utility model and the waterproof and dustproof films have a special structure, the condensed water vapor is effectively blocked outside the anti-fog air pressure balance device, and only a very small amount of air can enter the inside of the lamp. Moreover, since the opening time of the anti-fog air pressure balance device of the present utility model is very short, the purpose of controlling the water vapor content inside the lamp is achieved.

[0051] The two-way balanced lamp anti-fog device of the present utility model can effectively control the water vapor content inside the lamp, and further can effectively control the fogging condition of the lamp. At the same time, under the condition of effectively controlling the water vapor inside the lamp, the situation of pressure imbalance between the inside and outside of the lamp caused by huge temperature differences inside the lamp is better solved, ensuring the assembly and structural strength of the lamp.

[0052] As can be seen from the above description, through a large amount of research and development, the present utility model has analyzed and found the factors affecting the service life of the lamp. By uniquely setting one-way valves with opposite flow directions, when a positive pressure or negative pressure exceeding the threshold appears inside the lamp, the corresponding one-way valve opens to exchange air with the external environment, achieving pressure balance and avoiding damage to the lamp or affecting its service life. Moreover, under this technical measure of two-way pressure exchange, the research and development team of the present utility model fixes the first breathable waterproof and dustproof membrane 8 at the inlet part 6 of the one-way valve, and uniquely makes the waterproof and dustproof membrane elastic to completely and effectively prevent water vapor from entering and control the moisture content. Due to the pressure difference, the waterproof and dustproof membrane will elastically deform during use, and this elastic deformation will cause the filtering surface of the waterproof and dustproof membrane to form an arc shape, and thus the micropores on the waterproof and dustproof membrane will be distorted and deformed into micropores with irregular internal microstructures. The water vapor in the air, the water molecules themselves are relatively heavy and have binding properties with each other. When passing through the waterproof and dustproof membrane, due to the distortion and deformation of the micropores, the flow direction of the fluid changes, the water molecules are blocked and aggregated and then precipitate from the surface of the waterproof and dustproof membrane, and even become water droplets and slide off when the quantity is large. Through use tests, it is confirmed that the two-way balanced lamp anti-fog structure of the basic embodiment of the present utility model can still control the air moisture content inside the lamp well even when used in a very humid environment, and the pressure inside the lamp can be controlled relatively accurately, the service life is significantly extended, and there is no phenomenon of unclear damage.

[0053] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solutions of the present utility model, and these simple modifications all belong to the protection scope of the present utility model.

[0054] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present utility model will not describe various possible combination methods separately.

[0055] In addition, any combination can be made between various different embodiments of the present utility model as long as it does not violate the idea of the present utility model, and it should also be regarded as the content disclosed by the present utility model.

Claims

1. A two-way balanced anti-fog device for a lamp, comprising a lamp housing (1), characterized in that, A pair of one-way valves with opposite flow directions are hermetically installed on the lamp housing (1) so that the corresponding one-way valve can be opened by the pressure difference inside and outside the lamp housing (1) to achieve ventilation. A first breathable, waterproof and dustproof membrane (8) is installed at the inlet part (6) of each one-way valve. The first breathable, waterproof and dustproof membrane (8) is elastic so that the fluid inlet direction can be changed by elastic deformation.

2. The two-way balanced anti-fog device for lamps according to claim 1, characterized in that, A second breathable, waterproof and dustproof membrane (9) is installed at the outlet part of each one-way valve. The second breathable, waterproof and dustproof membrane (9) is elastic so that the fluid outflow direction can be changed by elastic deformation.

3. The two-way balanced anti-fog device for lamps according to claim 2, characterized in that, The internal flow channels of each one-way valve are formed into a plurality of flow branches (5a) at least at both ends.

4. The two-way balanced lamp anti-fog device according to claim 3, characterized in that The one-way valve includes a valve body (3) hermetically connected to the lamp housing (1). A valve core (5) is installed in the valve core cavity of the valve body (3) so that it can move back and forth. Circumferential flanges (5b) that contact the inner peripheral surface of the valve core cavity are respectively formed on the outer circumferences of both end parts of the valve core (5). A plurality of the flow branches (5a) that are circumferentially spaced apart are formed through the circumferential flanges along the length direction of the valve core.

5. The two-way balanced anti-fog device for lamps according to claim 4, characterized in that, A spring (7) is provided between the valve core (5) and the valve body (3). The valve core (5) is pressed against the inlet part by the elastic pressure of the spring so that the sealing part (4) of the valve core (5) forms a sealing contact with the circumferential sealing rib (6a) of the inlet part.

6. The two-way balanced anti-fog device for lamps according to any one of claims 2 to 5, characterized in that, The distribution density of the filter micropores on the first breathable, waterproof and dustproof membrane (8) and the second breathable, waterproof and dustproof membrane (9) decreases from the central area to the edge area.

7. The two-way balanced anti-fog device for lamps according to claim 6, characterized in that, The pore diameter of the filter micropores on the first breathable, waterproof and dustproof membrane (8) and the second breathable, waterproof and dustproof membrane (9) increases from the central area to the edge area.

8. The two-way balanced anti-fog device for lamps according to claim 6, characterized in that, The first breathable, waterproof and dustproof membrane (8) and the second breathable, waterproof and dustproof membrane (9) are Gore membranes.

9. The two-way balanced anti-fog device for lamps according to claim 6, wherein, The first breathable, waterproof and dustproof membrane (8) and the second breathable, waterproof and dustproof membrane (9) are detachably fixed to the one-way valve.

10. A vehicle lamp, characterized in that, This vehicle lamp includes a two-way balanced lamp anti-fog device according to any one of claims 1 to 9.

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