Anti-fog pressure balance air valve of car lamp

Abstract

An inner cavity of a valve body is arranged to be used for being communicated with an inner cavity of a vehicle lamp body, and the valve body is provided with a near-atmosphere channel communicated with the inner cavity and one end of the atmosphere side and a far-atmosphere channel communicated with the inner cavity and one end of the vehicle lamp side; a sealing assembly is arranged in an inner cavity of the valve body and is configured to selectively seal the far atmosphere channel and / or the near atmosphere channel according to the air pressure difference between the automobile lamp side and the atmosphere side of the valve body. According to the anti-fog pressure balance air valve for the automobile lamp, the sealing assembly in the valve body can completely seal a channel for communicating the automobile lamp side with the atmosphere side when the absolute value of the air pressure difference between the automobile lamp side and the atmosphere side of the valve body is lower than a set value, so that water vapor is thoroughly prevented from entering the automobile lamp, and the phenomenon of condensation in the automobile lamp is effectively avoided; and in addition, the sealing assembly is matched with the channel to realize conduction and closing of gas in the lamp and external atmosphere, so that pressure balance is ensured, and the problems of pressure change inside and outside the lamp body and condensation are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of car lamp anti-fog, in particular to a car lamp anti-fog pressure balance air valve. BACKGROUND

[0002] As a vehicle exterior part, the car lamp has the function of eye-catching decoration, and a well-designed car lamp can greatly improve the recognition of the vehicle. Under such a trend, the design of the car lamp tends to be more narrow and thin. Based on such a demand, the more complex car lamp will cause the air circulation in the car lamp to be more unsmooth, and the electronic components and LED lights in the car lamp will work and heat, causing the pressure in the car lamp to change, and the exchange of cold and hot air to cause the car lamp lens to produce fog. How to reduce the condensation to ensure the normal use of various functions of the car lamp is a unique challenge faced by car lamp manufacturers.

[0003] The common idea in the existing lamp anti-fog technology is to allow part of the water vapor to enter the car lamp, but the air convection inside and outside the car lamp needs to be strengthened to achieve cold and hot balance or water vapor release effect, thereby achieving the effect of preventing and treating the condensation of fog on the surface of the car lamp. Specifically, the current car lamp adopts a single waterproof and breathable film technology to reduce the amount of water vapor entering the car lamp, and the waterproof and breathable film can provide pressure balance and reliable protection for the car lamp components to achieve waterproof protection of the car lamp.

[0004] However, the above-mentioned existing technology is effective in a relatively dry air state, and under the condition of high external air humidity, it cannot effectively prevent water vapor from entering the lamp body from the outside of the car lamp, thereby causing the car lamp surface to still produce fog. Once the fog is generated, due to the limitation of the car lamp shape, the air cannot circulate effectively, which will directly cause the car lamp surface fog to be unable to dissipate, and even the current car lamp has a desiccant bag, which will be ineffective due to adsorption of too much water vapor.

[0005] Therefore, in order to solve the above problems, the present application provides a car lamp anti-fog pressure balance air valve which can ensure low water vapor content in the car lamp body and maintain pressure balance between the inside and outside of the car lamp body. SUMMARY

[0006] In order to solve the above-mentioned problems of the prior art, the present application provides a car lamp anti-fog pressure balance air valve.

[0007] According to one object of the present application, the present application provides a car lamp anti-fog pressure balance air valve, the two sides of the pressure balance air valve in the axial direction are respectively the car lamp side and the atmosphere side, and the pressure balance air valve comprises:

[0008] A valve body, an inner cavity of the valve body is arranged to communicate with an inner cavity of a lamp body of a vehicle lamp, the valve body is respectively provided with a near-atmosphere passage which communicates with the inner cavity and an atmospheric side, and a far-atmosphere passage which communicates with the inner cavity and a vehicle lamp side;

[0009] The valve body is provided with a sealing assembly which is configured to selectively seal the far-atmosphere passage and / or the near-atmosphere passage according to a pressure difference between the vehicle lamp side and the atmospheric side of the valve body;

[0010] When the pressure between the vehicle lamp side and the atmospheric side of the valve body is close, and the absolute value of the pressure difference is lower than a set value, the sealing assembly is in an intermediate balance position, and the sealing assembly simultaneously seals the near-atmosphere passage and the far-atmosphere passage;

[0011] When the pressure of the vehicle lamp side of the valve body is greater than the pressure of the atmospheric side, and the absolute value of the pressure difference exceeds the set value, the sealing assembly is in an atmospheric side position, the sealing assembly seals the far-atmosphere passage, and the near-atmosphere passage communicates the inside of the lamp body with the atmosphere;

[0012] When the pressure of the vehicle lamp side of the valve body is less than the pressure of the atmospheric side, and the absolute value of the pressure difference exceeds the set value, the sealing assembly is in a vehicle lamp side position, the sealing assembly seals the near-atmosphere passage, and the far-atmosphere passage communicates the inside of the lamp body with the atmosphere.

[0013] Preferably, the sealing assembly comprises:

[0014] A valve core and a sealing structure arranged between the valve body and the valve core, the valve core is movably mounted in the inner cavity of the valve body along the axial direction of the valve body in cooperation with the sealing structure, wherein the valve core is configured to move according to the pressure difference between the vehicle lamp side and the atmospheric side of the valve body, the valve core is provided with three working states of an intermediate balance position, an atmospheric side position and a vehicle lamp side position, and the valve core is provided with an elastic reset member configured to keep the valve core in the intermediate balance position;

[0015] When the pressure between the vehicle lamp side and the atmospheric side of the valve body is close, and the absolute value of the pressure difference is lower than a set value, the valve core is in an intermediate balance position state, and the sealing structure on the valve core simultaneously seals the near-atmosphere passage and the far-atmosphere passage;

[0016] When the pressure of the vehicle lamp side of the valve body is greater than the pressure of the atmospheric side, and the absolute value of the pressure difference exceeds the set value, the valve core is in an atmospheric side position state, the sealing structure on the valve core seals the far-atmosphere passage, and the atmospheric side of the valve body, the near-atmosphere passage, the inner cavity and the vehicle lamp side are sequentially communicated;

[0017] When the air pressure on the lamp side of the valve body is less than the air pressure on the atmospheric side, and the absolute value of the air pressure difference exceeds the set value, the valve core is in the lamp side position, the sealing structure on the valve core seals the near-atmosphere passage, and the atmospheric side, the inner cavity, the far-atmosphere passage and the lamp side of the valve body are sequentially communicated.

[0018] Preferably, two through holes are arranged on the inner wall of the valve body in the circumferential direction and are arranged in the axial direction, and the inner walls of the two through holes surround the near-atmosphere passage and the far-atmosphere passage, respectively, and the near-atmosphere passage and the far-atmosphere passage are staggered in the axial direction of the valve body.

[0019] The sealing structure comprises a far-atmosphere sealing ring assembly and a near-atmosphere sealing ring assembly arranged on the radial outer side of the valve core, the far-atmosphere sealing ring assembly and the near-atmosphere sealing ring assembly are arranged in the axial direction of the valve core, the far-atmosphere sealing ring assembly is configured to seal the near-atmosphere passage, and the near-atmosphere sealing ring assembly is configured to seal the far-atmosphere passage.

[0020] Preferably, the near-atmosphere passage and the far-atmosphere passage are respectively provided with openings in the inner cavity of the valve body, the far-atmosphere sealing ring assembly and the corresponding opening of the near-atmosphere passage are sealingly matched, and the near-atmosphere sealing ring assembly and the corresponding opening of the far-atmosphere passage are sealingly matched.

[0021] In the axial direction of the valve body, the size of the sealing ring is greater than and close to the size of the opening of the inner cavity of the valve body.

[0022] Preferably, the far-atmosphere sealing ring assembly and the near-atmosphere sealing ring assembly each comprise a plurality of sealing rings, and the sealing rings are sequentially and spacedly arranged in the axial direction of the valve core.

[0023] The plurality of sealing rings of the far-atmosphere sealing ring assembly and the near-atmosphere passage are sealingly matched.

[0024] The plurality of sealing rings of the near-atmosphere sealing ring assembly and the far-atmosphere passage are sealingly matched.

[0025] Preferably, the valve core is provided as a whole, the atmospheric side and the lamp side of the valve core are respectively provided with a mounting groove, the mounting groove is used to provide a limit for one end of an elastic return member, the other end of the elastic return member abuts against the end of the valve body, and each mounting groove is provided with an elastic return member.

[0026] Preferably, the valve core is provided in a split manner, the valve core is divided into a valve core one and a valve core two which are arranged in the axial direction of the valve body, the outer side of the valve core one is provided with the far-atmosphere sealing ring assembly, and the outer side of the valve core two is provided with the near-atmosphere sealing ring assembly.

[0027] Preferably, there is one elastic reset member, which is disposed between valve core one and valve core two, wherein valve core one and valve core two are provided with a mounting groove for limiting the end of the elastic reset member on their opposite sides.

[0028] Preferably, a drying component is provided on the headlight side of the valve body;

[0029] The drying assembly includes a drying container located at one end of the valve body on the headlight side. A desiccant pack is placed inside the drying container. An opening for the desiccant pack to enter and exit is provided on the side of the drying container away from the valve body. A valve cover is provided for opening and closing the opening. Both the valve cover and the drying container have holes that connect the inner cavity of the valve body to the atmospheric passage.

[0030] Preferably, a waterproof and breathable membrane is provided on the atmospheric side of the valve body;

[0031] A valve cover 2 is provided on the atmospheric side of the valve body. The valve cover 2 has a hole that connects the near-atmosphere channel and the inner cavity of the valve body. The waterproof and breathable membrane covers the side of the valve cover 2 that is in contact with the outside atmosphere.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This anti-fog pressure balancing valve for automotive lights provides waterproof protection for the light headlight side. During use, the sealing component inside the valve body completely seals the channel connecting the light headlight and atmospheric sides when the absolute value of the air pressure difference between the light headlight and atmospheric sides is lower than a set value. This completely prevents moisture from entering the light headlight. By strictly controlling the moisture content inside the headlight, condensation is effectively avoided. In addition, the sealing component matches the channel to conduct and close the gas inside the headlight to the external atmosphere, effectively ensuring pressure balance. This effectively protects the structure of the headlight housing, achieving the goal of protecting automotive original equipment manufacturers and lighting equipment suppliers at all levels, improving the reliability of components, and extending the service life of headlight components.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of an embodiment 1 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0036] Figure 2 This is a schematic diagram of the intermediate balance position in Embodiment 1 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0037] Figure 3This is a schematic diagram of the atmospheric side position in Embodiment 1 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0038] Figure 4 This is a schematic diagram of the side position of the vehicle headlight in Embodiment 1 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0039] Figure 5 This is a schematic diagram of an embodiment 2 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0040] Figure 6 This is a cross-sectional schematic diagram of Embodiment 2 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0041] Figure 7 This is a schematic diagram of the intermediate balance position in Embodiment 2 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0042] Figure 8 This is a schematic diagram of the side position of the vehicle headlight in Embodiment 2 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0043] Figure 9 This is a schematic diagram of the atmospheric side position in Embodiment 2 of the vehicle headlight anti-fog pressure balancing valve of the present invention;

[0044] Figure 10 This is a schematic diagram of an embodiment 3 of the vehicle headlight anti-fog pressure balancing valve described in this invention. Detailed Implementation

[0045] The following description is intended to provide a detailed account of the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0046] This invention provides a technical solution: a vehicle lamp anti-fog pressure balancing valve, which adopts a slide valve structure system. By utilizing the three different positions of the valve core 2 relative to the valve body 1, the conduction and disconnection states of the air passage are changed, thereby achieving a low water vapor content and a relatively balanced internal environment of the lamp body with pressure inside and outside the lamp.

[0047] Please refer to the details. Figures 1-10 A headlight anti-fog pressure balancing valve, wherein the two axial sides of the pressure balancing valve are the headlight side (a) and the atmospheric side (b), and the pressure balancing valve includes:

[0048] The valve body 1 has an outer wall configured for mounting a vehicle lamp housing, and an inner cavity configured for communicating with the inner cavity of the vehicle lamp housing. The valve body 1 is provided with a near-atmosphere channel 101 communicating with the inner cavity and one end of the atmospheric side b, and a far-atmosphere channel 102 communicating with the inner cavity and one end of the vehicle lamp side a.

[0049] The valve body 1 is provided with a sealing assembly in its inner cavity. The sealing assembly is configured to selectively seal the far atmospheric passage 102 and / or the near atmospheric passage 101 based on the air pressure difference between the headlight side a and the atmospheric side b of the valve body 1.

[0050] When the air pressure between the headlight side a and the atmospheric side b of the valve body 1 is close and the absolute value of the air pressure difference is lower than the set value, the sealing assembly is in the intermediate equilibrium position, and the sealing assembly simultaneously seals the near atmospheric channel 101 and the far atmospheric channel 102.

[0051] When the air pressure on the headlight side a of valve body 1 is greater than the air pressure on the atmospheric side b, and the absolute value of the air pressure difference exceeds the set value, the sealing assembly is in the atmospheric side position, and the sealing assembly seals the far atmospheric channel 102, while the near atmospheric channel 101 connects the inside of the headlight body to the atmosphere.

[0052] When the air pressure on the headlight side a of valve body 1 is less than the air pressure on the atmospheric side b, and the absolute value of the air pressure difference exceeds the set value, the sealing assembly is in the headlight side position, and the sealing assembly seals the near-atmosphere channel 101, while the far-atmosphere channel 102 connects the inside of the headlight body to the atmosphere.

[0053] This anti-fog pressure balancing valve for automotive lights provides waterproof protection for the headlight side (a). During use, the sealing component inside the valve body 1 completely seals the channel connecting the headlight side (a) and the atmospheric side (b) when the pressure difference between them is lower than a set value. This completely prevents moisture, including water vapor, from entering the headlight. By strictly controlling the moisture content inside the headlight, condensation is effectively avoided. Furthermore, the sealing component matches the channel to allow for the opening and closing of the gas inside the headlight and the external atmosphere, effectively ensuring pressure balance. This provides effective protection for the headlight housing structure, thereby protecting the original equipment manufacturer (OEM) and lighting equipment suppliers at all levels, improving component reliability, and extending the lifespan of headlight components.

[0054] See Figure 1 and 5 The sealing assembly includes:

[0055] The sealing assembly includes:

[0056] The valve core 2 and the sealing structure 3 disposed between the valve body 1 and the valve core 2 are provided. The valve core 2 is movably installed in the inner cavity of the valve body 1 along the axial direction of the valve body 1 in cooperation with the sealing structure 3. The valve core 2 is configured to move according to the air pressure difference between the headlight side a and the atmospheric side b of the valve body 1. The valve core 2 is provided with three working states: intermediate balance position, atmospheric side position and headlight side position. The valve core 2 is provided with an elastic reset member 4 configured to keep the valve core 2 in the intermediate balance position.

[0057] When the air pressure between the headlight side a and the atmospheric side b of the valve body 1 is close and the absolute value of the air pressure difference is lower than the set value, the valve core 2 is in the intermediate balance position state, and the sealing structure 3 on the valve core 2 simultaneously seals the near atmospheric channel 101 and the far atmospheric channel 102.

[0058] When the air pressure on the headlight side a of valve body 1 is greater than the air pressure on the atmospheric side b, and the absolute value of the air pressure difference exceeds the set value, the valve core 2 is in the atmospheric side position, and the sealing structure 3 on the valve core 2 seals the far atmospheric passage 102. The atmospheric side b of valve body 1, the near atmospheric passage 101, the inner cavity and the headlight side a are connected in sequence.

[0059] When the air pressure on the headlight side a of valve body 1 is less than the air pressure on the atmospheric side b, and the absolute value of the air pressure difference exceeds the set value, the valve core 2 is in the headlight side position. The sealing structure 3 on the valve core 2 seals the near-atmosphere channel 101. The atmospheric side b, the inner cavity, the far-atmosphere channel 102, and the headlight side a of valve body 1 are connected in sequence.

[0060] See also Figure 1 and 5 The inner wall of the valve body 1 is provided with two through holes spaced apart in the circumferential direction and arranged along its axial direction. The inner walls of the two through holes respectively form the near-atmosphere channel 101 and the far-atmosphere channel 102. In the axial direction of the valve body 1, the near-atmosphere channel 101 and the far-atmosphere channel 102 are arranged alternately.

[0061] The sealing structure 3 includes a far-atmosphere sealing ring assembly 301 and a near-atmosphere sealing ring assembly 302 sleeved on the radially outer side of the valve core 2. The far-atmosphere sealing ring assembly 301 and the near-atmosphere sealing ring assembly 302 are spaced apart in the axial direction of the valve core 2. The far-atmosphere sealing ring assembly 301 is configured to seal the near-atmosphere passage 101, and the near-atmosphere sealing ring assembly 302 is configured to seal the far-atmosphere passage 102.

[0062] The staggered layout of the two channels places the far-atmosphere sealing ring assembly 301 and the near-atmosphere sealing ring assembly 302 in different axial positions, allowing the valve core 2 to control the opening and closing of the two channels in stages and segments. Specifically, in the intermediate balance position, the valve core 2 is in the middle position under the action of the elastic reset member 4. At this time, the two sealing rings can simultaneously block their corresponding staggered through holes to achieve absolute isolation. In the non-intermediate balance position, when the valve core 2 moves, due to the staggered arrangement of the channels, the sealing ring assembly only opens one channel while still sealing the other channel, achieving pressure balance and reducing the cross-contamination of gas and water vapor.

[0063] Furthermore, the near-atmosphere channel 101 and the far-atmosphere channel 102 are respectively provided with openings in the inner cavity of the valve body 1, the far-atmosphere sealing ring assembly 301 and the corresponding opening of the near-atmosphere channel 101 are sealed together, and the near-atmosphere sealing ring assembly 302 and the corresponding opening of the far-atmosphere channel 102 are sealed together.

[0064] In the axial direction of the valve body 1, the size of the sealing ring is slightly larger than the size of the opening of the inner cavity of the valve body 1.

[0065] Regarding the valve core 2 and the sealing structure 3, the present invention provides the following embodiments;

[0066] Example 1

[0067] See Figure 1 The valve core 2 is configured as a whole and is cylindrical. The valve core 2 has an installation groove on the atmospheric side b and the headlight side a respectively. The installation groove is used to limit one end of the elastic reset member 4. The other end of the elastic reset member 4 abuts against the end of the valve body 1. There are two elastic reset members 4, and one elastic reset member 4 is provided in each installation groove.

[0068] An air chamber is formed between the far-atmosphere sealing ring assembly 301 and the near-atmosphere sealing ring assembly 302. In use, when the valve core 2 is in the atmospheric side position or the headlight side position, the air chamber connects to the channel that needs to be sealed, thereby sealing the corresponding channel and ensuring that only one channel is open.

[0069] Example 2

[0070] See Figure 5 Compared to the previous embodiment, the difference is that the valve core 2 is set in two parts. The valve core 2 is divided into valve core one 201 and valve core two 202, which are spaced apart along the axial direction of the valve body 1. The outer side of the valve core one 201 is provided with the far atmosphere sealing ring assembly 301, and the outer side of the valve core two 202 is provided with the near atmosphere sealing ring assembly 302.

[0071] The number of elastic reset members 4 is one, and the elastic reset member 4 is disposed between the valve core one 201 and the valve core two 202. The valve core one 201 and the valve core two 202 are provided with a mounting groove for providing a limit for the end of the elastic reset member 4 on their opposite sides.

[0072] In use, the two separate valve cores 2 can move independently, see [reference]. Figures 7-9 .

[0073] Example 3

[0074] This embodiment is designed based on embodiments 2 and 1 above. In embodiments 2 and 1, each sealing ring corresponds to one channel. The difference in this embodiment is that... (See...) Figure 10 Both the far-atmosphere sealing ring assembly 301 and the near-atmosphere sealing ring assembly 302 include multiple sealing rings, which are arranged sequentially at intervals along the axial direction of the valve core 2.

[0075] The multiple sealing rings of the far-atmosphere sealing ring assembly 301 and the near-atmosphere channel 101 are sealed together.

[0076] The near-atmosphere sealing ring assembly 302 has multiple sealing rings that are sealed together with the far-atmosphere channel 102.

[0077] In Examples 2 and 3, the two valve cores move independently. One valve core moves to open to the atmosphere and the inner cavity of the headlight, while the other valve core remains stationary to maintain a seal.

[0078] In the above embodiments, the elastic reset member 4 is a columnar spring. Alternatively, the elastic reset member 4 can also be a flat spring, or other components with elastic functions.

[0079] In addition, a drying component 5 and a waterproof and breathable membrane 7 are provided on both sides of the valve body 1. The drying component 5 is provided on the lamp side a of the valve body 1, and the waterproof and breathable membrane 7 is provided on the atmosphere side b of the valve body 1, so as to further remove moisture from the gas when the gas inside the lamp is connected to the outside atmosphere, and ensure that the lamp body is dry.

[0080] This technical solution requires replacement of the desiccant pack in case of failure. Compared to existing technologies that only use a waterproof membrane, this solution uses a sliding valve structure system to achieve ventilation, ensuring a dry and isobaric balanced environment inside the lamp, thereby guaranteeing the reliability of the components inside the lamp and extending the service life of the vehicle lamp components.

[0081] See Figure 1The drying assembly 5 includes a drying container 501, which is disposed at one end of the valve body 1 on the headlight side (a). A desiccant pack 502 is disposed inside the drying container 501. An opening for the desiccant pack 502 to enter and exit is provided on the side of the drying container 501 away from the valve body 1, and a valve cover 6 for opening and closing the opening is provided. Both the valve cover 6 and the drying container 501 have holes that connect the inner cavity of the valve body 1 and the atmospheric passage 102. The valve cover 6 is detachably connected to the drying container 501 to facilitate replacement of the desiccant pack 502. The drying assembly 5 does not extend radially beyond the valve body 1. Preferably, the radial outer side of the drying assembly 5 is flush with the radial outer side of the valve body 1.

[0082] The valve body 1 is also provided with a valve cover 2 8 on the atmospheric side b. The valve cover 2 8 is provided with a hole that connects the near-atmosphere channel 101 and the inner cavity of the valve body 1. The waterproof and breathable membrane 7 covers the side of the valve cover 2 8 that is in contact with the outside atmosphere or directly covers the end of the valve body 1 that is in contact with the outside atmosphere. Preferably, the waterproof and breathable membrane 7 covers the side of the valve cover 2 8 that is away from the valve body 1.

[0083] In Embodiment 1, the end of the elastic reset member 4 abuts against the center of the valve cover 8 and the drying container 501.

[0084] In embodiment 2, the valve cover 8 and the valve body 1 are integrally formed into a whole, and the waterproof and breathable membrane 7 covers the atmospheric side b of the whole.

[0085] How to use:

[0086] Taking Example 1 as an example, the venting pressure valve generally includes a waterproof membrane, a valve cover, a valve body 1, an elastic reset member 4, a valve core 2 fitted with a sealing ring, and a drying assembly 5. The valve core 2 is installed inside the valve body 1, which has venting channels, via the elastic reset member 4 and an end cap. The drying assembly 5 is installed on the valve body 1 near the inner end of the lamp body, i.e., the lamp side a, and on the outer end of the lamp body, i.e., the atmospheric side b, a waterproof membrane covers it. Two through holes inside the valve body 1 form two channels. One through hole connects the atmosphere and the inner cavity of the valve body 1 and can be sealed by the far-atmosphere sealing ring assembly 301. The other vent hole connects the inside of the lamp body and the inner cavity of the valve body 1 and can be sealed by the near-atmosphere sealing ring assembly 302. Under the action of the elastic reset member 4, the valve core 2 maintains a stable relative position within the valve body 1, and the two vent holes are sealed by the sealing ring. Figure 2 As shown, this state is taken as the initial state;

[0087] When the internal gas pressure of the lamp body increases due to environmental factors, the valve core 2 moves towards the atmospheric side b, and the through hole sealed by the far-atmosphere sealing ring assembly 301 is opened, that is, the near-atmosphere channel 101 is opened. The near-atmosphere sealing ring assembly 302 cooperates with the far-atmosphere sealing ring assembly 301 to maintain the seal of the far-atmosphere channel 102, and the interior of the lamp body is connected to the atmosphere. Figure 3 As shown;

[0088] When the internal pressure of the lamp body decreases and reaches equilibrium, that is, when the pressure difference between the inside and outside of the lamp is lower than the set value range, the valve core 2 is reset under the action of the elastic reset member 4, and the atmospheric sealing ring assembly 301 seals the near atmospheric passage 101.

[0089] When the internal gas pressure of the lamp body decreases due to environmental factors, the valve core 2 moves towards the lamp side a, and the through hole sealed by the near-atmosphere sealing ring assembly 302 is opened, that is, the far-atmosphere passage 102 is opened. The near-atmosphere sealing ring assembly 302, together with the far-atmosphere sealing ring assembly 301, maintains the seal of the near-atmosphere passage 101, and the interior of the lamp body is connected to the atmosphere. Figure 4 As shown;

[0090] After the internal pressure of the lamp body rises to equilibrium, the valve core 2 is reset under the action of the elastic reset member 4, and the sealing assembly simultaneously seals the near-atmosphere channel 101 and the far-atmosphere channel 102.

[0091] The waterproof membrane and desiccant pack further ensure that the inside of the lamp body remains dry. The valve core 2 can be maintained in different positions relative to the valve body 1 by one or more springs, thereby changing the opening and closing of the vent of the valve body 1, thus achieving a state of pressure balance inside the lamp body.

[0092] In summary, the anti-fog pressure balancing valve of this vehicle lamp, under the action of the elastic reset member 4, can cooperate with the sealing ring to seal all the channels on the valve body 1 to achieve isolation between the inside and outside of the lamp body. When the internal pressure decreases or increases due to environmental changes, the valve core 2 moves in the valve body 1 under the influence of the imbalance between the internal and external pressures, thereby opening the corresponding channels and keeping the internal pressure of the lamp body in a state of intermediate balance.

[0093] It is evident that the connection between the inside and outside of the lamp body only occurs under conditions of pressure imbalance, which significantly reduces the time for water vapor to enter the lamp body. The valve body 1 integrates the drying component 5, which further reduces the water vapor content inside the lamp body.

[0094] The anti-fog pressure balancing valve for vehicle lights can effectively prevent fogging on the outer surface of the lights, improve the reliability of the components inside the lights, and extend the service life of the vehicle light components.

[0095] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A pressure balancing valve for vehicle headlights, wherein the two axial sides of the pressure balancing valve are respectively the headlight side (a) and the atmospheric side (b), characterized in that, The pressure balancing valve includes: The valve body (1) has an inner cavity configured to connect to the inner cavity of the vehicle lamp. The valve body (1) is provided with a near-atmosphere channel (101) connecting the inner cavity and one end of the atmospheric side (b), and a far-atmosphere channel (102) connecting the inner cavity and one end of the vehicle lamp side (a). The valve body (1) is provided with a sealing assembly in its inner cavity. The sealing assembly is configured to selectively seal the far atmospheric passage (102) and / or the near atmospheric passage (101) based on the air pressure difference between the headlight side (a) and the atmospheric side (b) of the valve body (1). When the air pressure between the headlight side (a) and the atmospheric side (b) of the valve body (1) is close and the absolute value of the air pressure difference is lower than the set value, the sealing assembly is in the intermediate equilibrium position, and the sealing assembly simultaneously seals the near atmospheric channel (101) and the far atmospheric channel (102). When the air pressure on the lamp side (a) of the valve body (1) is greater than the air pressure on the atmospheric side (b), and the absolute value of the air pressure difference exceeds the set value, the sealing assembly is in the atmospheric side position, the sealing assembly seals the far atmospheric channel (102), and the near atmospheric channel (101) connects the inside of the lamp body to the atmosphere. When the air pressure on the headlight side (a) of the valve body (1) is less than the air pressure on the atmospheric side (b), and the absolute value of the air pressure difference exceeds the set value, the sealing assembly is in the headlight side position, and the sealing assembly seals the near-atmosphere channel (101), while the far-atmosphere channel (102) connects the interior of the headlight body to the atmosphere.

2. The vehicle headlight anti-fog pressure balancing valve according to claim 1, characterized in that, The sealing assembly includes: The valve core (2) and the sealing structure (3) disposed between the valve body (1) and the valve core (2) are provided. The valve core (2) is installed in the inner cavity of the valve body (1) along the axial direction of the valve body (1) in cooperation with the sealing structure (3). The valve core (2) is configured to move according to the air pressure difference between the headlight side (a) and the atmospheric side (b) of the valve body (1). The valve core (2) is provided with three working states: intermediate balance position, atmospheric side position and headlight side position. The valve core (2) is provided with an elastic reset member (4) configured to keep the valve core (2) in the intermediate balance position. When the air pressure between the headlight side (a) and the atmospheric side (b) of the valve body (1) is close and the absolute value of the air pressure difference is lower than the set value, the valve core (2) is in the intermediate balance position state, and the sealing structure (3) on the valve core (2) simultaneously seals the near atmospheric channel (101) and the far atmospheric channel (102). When the air pressure on the headlight side (a) of the valve body (1) is greater than the air pressure on the atmospheric side (b), and the absolute value of the air pressure difference exceeds the set value, the valve core (2) is in the atmospheric side position, and the sealing structure (3) on the valve core (2) seals the far atmospheric channel (102). The atmospheric side (b), the near atmospheric channel (101), the inner cavity and the headlight side (a) of the valve body (1) are connected in sequence. When the air pressure on the headlight side (a) of the valve body (1) is less than the air pressure on the atmospheric side (b), and the absolute value of the air pressure difference exceeds the set value, the valve core (2) is in the headlight side position. The sealing structure (3) on the valve core (2) seals the near-atmosphere channel (101). The atmospheric side (b), inner cavity, far-atmosphere channel (102) and headlight side (a) of the valve body (1) are connected in sequence.

3. The vehicle headlight anti-fog pressure balancing valve according to claim 2, characterized in that, The inner wall of the valve body (1) is provided with two through holes spaced apart in the circumferential direction and arranged along its axial direction. The inner walls of the two through holes respectively form the near-atmosphere channel (101) and the far-atmosphere channel (102). In the axial direction of the valve body (1), the near-atmosphere channel (101) and the far-atmosphere channel (102) are arranged alternately. The sealing structure (3) includes a far-atmosphere sealing ring assembly (301) and a near-atmosphere sealing ring assembly (302) sleeved on the radially outer side of the valve core (2). The far-atmosphere sealing ring assembly (301) and the near-atmosphere sealing ring assembly (302) are spaced apart in the axial direction of the valve core (2). The far-atmosphere sealing ring assembly (301) is configured to seal the near-atmosphere passage (101), and the near-atmosphere sealing ring assembly (302) is configured to seal the far-atmosphere passage (102).

4. The vehicle headlight anti-fog pressure balancing valve according to claim 3, characterized in that, The near-atmosphere channel (101) and the far-atmosphere channel (102) are respectively provided with openings in the inner cavity of the valve body (1). The far-atmosphere sealing ring assembly (301) and the opening corresponding to the near-atmosphere channel (101) are sealed together, and the near-atmosphere sealing ring assembly (302) and the opening corresponding to the far-atmosphere channel (102) are sealed together. In the axial direction of the valve body (1), the size of the sealing ring is larger than and close to the size of the inner cavity opening of the valve body (1).

5. A vehicle headlight anti-fog pressure balancing valve according to claim 3, characterized in that, Both the far-atmosphere sealing ring assembly (301) and the near-atmosphere sealing ring assembly (302) include multiple sealing rings, which are arranged sequentially at intervals along the axial direction of the valve core (2); The multiple sealing rings of the far-atmosphere sealing ring assembly (301) and the near-atmosphere channel (101) are sealed together; The near-atmosphere sealing ring assembly (302) has multiple sealing rings that are sealed to the far-atmosphere channel (102).

6. A vehicle headlight anti-fog pressure balancing valve according to claim 1, characterized in that, The valve core (2) is configured as a whole. The atmospheric side (b) and the headlight side (a) of the valve core (2) are respectively provided with a mounting groove. The mounting groove is used to provide a limit for one end of the elastic reset member (4). The other end of the elastic reset member (4) abuts against the end of the valve body (1). Each mounting groove is provided with an elastic reset member (4).

7. A vehicle headlight anti-fog pressure balancing valve according to claim 1, characterized in that, The valve core (2) is a split unit, which is divided into valve core one (201) and valve core two (202) spaced apart along the axial direction of the valve body (1). The outer side of the valve core one (201) is provided with the far atmosphere sealing ring assembly (301), and the outer side of the valve core two (202) is provided with the near atmosphere sealing ring assembly (302).

8. A vehicle headlight anti-fog pressure balancing valve according to claim 7, characterized in that, The number of the elastic reset member (4) is one. The elastic reset member (4) is disposed between the valve core one (201) and the valve core two (202). The valve core one (201) and the valve core two (202) are provided with a mounting groove for providing a limit for the end of the elastic reset member (4) on opposite sides.

9. A vehicle headlight anti-fog pressure balancing valve according to claim 1, characterized in that, A drying component (5) is provided on the headlight side (a) of the valve body (1); The drying assembly (5) includes a drying container (501), which is located at one end of the valve body (1) on the headlight side (a). A desiccant pack (502) is provided inside the drying container (501). An opening for the desiccant pack (502) is provided on the side of the drying container (501) away from the valve body (1), and a valve cover (6) for opening and closing the opening is provided. Both the valve cover (6) and the drying container (501) have holes that connect the inner cavity of the valve body (1) and the atmospheric passage (102).

10. A vehicle headlight anti-fog pressure balancing valve according to claim 1, characterized in that, A waterproof and breathable membrane (7) is provided on the atmospheric side (b) of the valve body (1). A valve cover (8) is provided on the atmospheric side (b) of the valve body (1). The valve cover (8) has a hole that connects the near-atmosphere channel (101) and the inner cavity of the valve body (1). The waterproof and breathable membrane (7) covers the side of the valve cover (8) that is in contact with the outside atmosphere.

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