Anti-fog devices, lights and vehicles

Abstract

This invention discloses an anti-fog device, a lamp, and a vehicle. The anti-fog device is installed on a lamp body, which has a lamp cavity. The anti-fog device includes a housing and an air valve. The housing defines a third vent hole for connecting the lamp cavity to the outside atmosphere. The air valve is located at the third vent hole and includes a cap. The edge of the cap seals against the housing to close the third vent hole. The cap has an inner side and an outer side, with a protrusion between the inner side and the housing. When the pressure on the inner side is greater than the pressure on the outer side, the edge of the cap separates from the housing and opens the third vent hole. When the pressure on the inner side is less than the pressure on the outer side, the edge of the cap lifts up around the protrusion and separates from the housing, opening the third vent hole. The anti-fog device of this invention simplifies the structure of the air valve and reduces its space occupation.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to an anti-fog device, a lamp, and a vehicle. Background Technology

[0002] Vehicle lights are used to illuminate vehicles while they are in motion. During use, the inside of the light body may experience high or low pressure relative to the outside atmosphere. In other words, there is a pressure difference between the inside of the light body and the outside atmosphere. If this pressure difference is not balanced in time, it can easily affect the lifespan of the light body.

[0003] Typically, a two-way air valve is installed in the lamp body to balance the pressure difference between the inside of the lamp body and the outside atmosphere. When the pressure difference between the inside of the lamp body and the outside atmosphere is balanced, the two-way air valve closes the vent that connects the inside of the lamp body and the outside atmosphere; when there is a pressure difference between the inside of the lamp body and the outside atmosphere, the two-way air valve opens the vent under the action of the pressure difference, so as to allow air to pass between the inside of the lamp body and the outside atmosphere, thereby achieving the balance of the pressure difference between the inside of the lamp body and the outside atmosphere.

[0004] In related technologies, the structure of a two-way air valve is relatively complex and occupies a large space in order to realize the two-way ventilation function of the vent. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an anti-fog device, a lamp, and a vehicle that can simplify the structure of the valve and reduce its space occupation.

[0006] In a first aspect, embodiments of the present invention provide an anti-fog device, which is used to be installed on a lamp body, the lamp body having a lamp cavity, and the anti-fog device includes: The housing defines a third vent, which is used to connect the lamp cavity to the outside atmosphere. An air valve is located at the third vent. The air valve includes a cap, the edge of which is sealed against the housing to close the third vent. The cap has an inner side and an outer side, with a protrusion between the inner side and the housing. When the pressure on the inner side is greater than the pressure on the outer side, the edge of the cap separates from the housing and opens the third vent. When the pressure on the inner side is less than the pressure on the outer side, the edge of the cap lifts up with the protrusion as a fulcrum and separates from the housing, opening the third vent.

[0007] The anti-fog device according to embodiments of the present invention has at least the following beneficial effects: Based on the umbrella-shaped structure of the cap, when the pressure on the inner side of the cap is greater than the pressure on the outer side, the inner side will experience a pushing force pointing from the inner side to the outer side. This causes the edge of the cap to deform and separate from the shell, creating a gap between the edge of the cap and the shell. This gap opens the third vent, allowing airflow between the lamp cavity and the outside atmosphere. This enables the valve to open in one ventilation direction. Furthermore, by creating a protrusion between the inner side of the cap and the shell, a lever mechanism is formed between the cap and the protrusion. When the pressure on the inner side of the cap is less than the pressure on the outer side, the outer side will... Subjected to a pushing force from the outer side to the inner side, the part of the umbrella cap located between its center and the protrusion can use the protrusion as a fulcrum to lift the edge of the umbrella cap, allowing the edge of the umbrella cap to deform and separate from the shell. In other words, the edge of the umbrella cap can be lifted with the protrusion as a fulcrum and separated from the shell, thus forming a gap between the edge of the umbrella cap and the shell to open the third vent hole and allow the lamp cavity to communicate with the outside atmosphere through the third vent hole. This realizes the opening action of the air valve in another venting direction. In this way, the bidirectional venting function of the air valve with a single valve core structure is realized. Its structure is simple, occupies less space, which is conducive to reducing the overall volume of the anti-fog device and has a low cost.

[0008] According to some embodiments of the present invention, a deformable space is defined between the inner side and the housing, the deformable space is in communication with a third vent, and the protrusion is located within the deformable space.

[0009] According to some embodiments of the present invention, the protrusion has an abutting surface located at the end of the protrusion away from the shell, the abutting surface abuts against the inner surface, and the distance between the abutting surface and the shell gradually decreases along the direction from the center of the umbrella cap to the edge of the umbrella cap.

[0010] According to some embodiments of the present invention, the number of protrusions is at least two, and the at least two protrusions are arranged at circumferential intervals along the umbrella cap; And / or, the number of third vents is at least two, and the at least two third vents are spaced apart circumferentially along the umbrella cap.

[0011] According to some embodiments of the invention, the outer surface defines a groove that is close to the edge of the umbrella cap relative to the protrusion.

[0012] According to some embodiments of the present invention, the groove extends circumferentially along the valve to form an annular shape.

[0013] According to some embodiments of the present invention, the protrusion is fixed to the housing, and the end of the protrusion away from the housing abuts against the umbrella cap.

[0014] According to some embodiments of the present invention, the protrusion has an abutting surface located at the end of the protrusion away from the shell, the abutting surface abuts against the inner surface, and the distance between the abutting surface and the shell gradually decreases along the direction from the center of the umbrella cap to the edge of the umbrella cap.

[0015] According to some embodiments of the present invention, the first opening pressure at which the gas valve opens the third vent when the gas pressure in the lamp cavity is greater than the gas pressure of the outside atmosphere is less than the second opening pressure at which the gas valve opens the third vent when the gas pressure in the lamp cavity is less than the gas pressure of the outside atmosphere.

[0016] According to some embodiments of the present invention, the housing further defines a connection hole; The valve also includes an umbrella handle, which passes through the connection hole and is connected to the inner side. The umbrella handle has a limiting end, which is located on the side of the housing away from the umbrella cap and abuts against the housing.

[0017] According to some embodiments of the present invention, a protective structure is provided on the side of the shell away from the umbrella cap, and the protective structure surrounds the outer periphery of the limiting end; According to some embodiments of the present invention, the third vent is located radially outside the connecting hole, or the third vent is located on the inner wall of the connecting hole and communicates with the connecting hole.

[0018] According to some embodiments of the present invention, the housing further defines a storage cavity and a first vent hole, the first vent hole and a third vent hole respectively communicating with the storage cavity, the first vent hole being used to connect the storage cavity with the outside atmosphere, and the umbrella cap being located in the storage cavity.

[0019] According to some embodiments of the present invention, the housing further defines a receiving cavity, a first vent hole and a second vent hole, the first vent hole being used to connect the receiving cavity and the outside atmosphere, the second vent hole being used to connect with the lamp cavity, and the third vent hole being used to connect the receiving cavity and the lamp cavity. The anti-fog device also includes an elastic container located in the receiving cavity and connected to the housing. The elastic container defines a pressure regulating chamber, which communicates with a second vent. The elastic container is configured to extend axially to a first limit state or contract axially to a second limit state, thereby adjusting the gas volume of the pressure regulating chamber. When the elastic container extends to its first limit state and the air pressure in the lamp cavity is greater than the air pressure of the outside atmosphere, the edge of the umbrella cap separates from the shell; when the elastic container contracts to its second limit state and the air pressure in the lamp cavity is less than the air pressure of the outside atmosphere, the edge of the umbrella cap lifts up with the protrusion as the fulcrum and separates from the shell.

[0020] According to some embodiments of the present invention, the anti-fog device further includes a waterproof and breathable membrane, which covers the first vent.

[0021] Secondly, embodiments of the present invention also provide a lamp, the lamp including a lamp body and an anti-fog device as described in any of the above embodiments, the lamp body defining a mounting hole, and the housing being mounted in the mounting hole.

[0022] The lamps in this embodiment of the invention have the beneficial effect of an anti-fog device, which will not be elaborated here.

[0023] Thirdly, embodiments of the present invention also provide a vehicle, the vehicle including the lamps described above.

[0024] The vehicle in this embodiment of the invention has the beneficial effect of an anti-fog device, which will not be elaborated here.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the anti-fog device and lamp body assembly provided in one embodiment of the present invention; Figure 2 for Figure 1 The diagram shown is a structural schematic of the anti-fog device. Figure 3 for Figure 2 Enlarged view of part D; Figure 4 This is a schematic diagram of the structure of the housing and the valve in another embodiment of the present invention.

[0027] Figure label: Lighting fixtures 1000; Anti-fog device 100; housing 10; third vent 101; connecting hole 102; storage cavity 103; first vent 104; second vent 105; first side 10a; second side 10b; protrusion 11; contact surface 111; protective structure 12; first sub-shell 13; second sub-shell 14; limiting plate 15; isolation structure 16; air valve 20; groove 201; umbrella cap 21; umbrella handle 22; limiting end 221; inner side 211; outer side 212; deformation space 110; elastic container 30; pressure regulating cavity 301; fixed end 30a; free end 30b; sub-fold 30c; waterproof and breathable membrane 40; Lamp body 200; lamp cavity 210; mounting hole 220. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0032] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] In related technologies, some bidirectional air valves have a dual-valve-core structure, including a first sub-valve and a second sub-valve. The vent holes include a first sub-through hole and a second sub-through hole distributed radially. The first sub-valve is located in the first sub-through hole, and the second sub-valve is located in the second sub-through hole, with the first and second sub-valve installed in opposite directions. When the pressure difference between the inside of the lamp body and the outside atmosphere is balanced, the first sub-valve closes the first sub-through hole, and the second sub-valve closes the second sub-through hole. When the air pressure inside the lamp body is greater than the outside atmosphere pressure, the first sub-valve opens the first sub-through hole to allow exhaust gas from the inside of the lamp body to the outside atmosphere through the first sub-through hole; at this time, the second sub-valve closes the second sub-through hole. When the air pressure inside the lamp body is less than the outside atmosphere pressure, the second sub-valve opens the second sub-through hole to allow outside air to enter the inside of the lamp body through the second sub-through hole; at this time, the first sub-valve closes the first sub-through hole. This type of bidirectional air valve has a complex structural design, occupies a large space, and has a high cost.

[0034] In view of this, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the assembly of the anti-fog device 100 and the lamp body 200 according to one embodiment of the present invention. Figure 2 for Figure 1 The schematic diagram of the anti-fog device 100 shown in this embodiment of the invention provides an anti-fog device 100 for installation on a lamp body 200. The lamp body 200 has a lamp cavity 210. The anti-fog device 100 can balance the pressure difference between the lamp cavity 210 and the outside atmosphere.

[0035] Please combine Figure 3 , Figure 3 for Figure 2 The enlarged view of part D shows that the anti-fog device 100 includes a housing 10 and an air valve 20, with the air valve 20 installed on the housing 10. The housing 10 can be a separate structure from the lamp body 200, meaning the housing 10 and the lamp body 200 need to be assembled to fix each other; alternatively, the housing 10 can be an integral structure formed with the lamp body 200, meaning the housing 10 and the lamp body 200 are formed together as a single structure and fixed to each other. In this case, the housing 10 is a part of the lamp body 200, and the housing 10 and the lamp body 200 do not need to be assembled to fix each other.

[0036] The housing 10 defines a third vent 101, which is used to connect the lamp cavity 210 with the outside atmosphere.

[0037] The air valve 20 is located at the third vent 101. The air valve 20 includes an umbrella cap 21. The edge of the umbrella cap 21 is sealed against the housing 10 to close the third vent 101. Specifically, along the axial direction of the center line of the umbrella cap 21, the projection of the third vent 101 is located within the projection range of the umbrella cap 21. Thus, when the edge of the umbrella cap 21 is sealed against the housing 10, the umbrella cap 21 blocks the airflow between the lamp cavity 210 and the outside atmosphere, and the lamp cavity 210 and the outside atmosphere cannot communicate with each other through the third vent 101.

[0038] The umbrella cap 21 has an inner side 211 and an outer side 212, with a protrusion 11 between the inner side 211 and the housing 10. When the pressure on the inner side 211 is greater than the pressure on the outer side 212, the edge of the umbrella cap 21 separates from the housing 10 and opens the third vent hole 101, allowing ventilation between the lamp cavity 210 and the outside atmosphere. When the pressure on the inner side 211 is less than the pressure on the outer side 212, the edge of the umbrella cap 21 lifts up with the protrusion 11 as a fulcrum and separates from the housing 10, opening the third vent hole 101, allowing ventilation between the lamp cavity 210 and the outside atmosphere.

[0039] In this embodiment of the invention, based on the umbrella-shaped structure of the umbrella cap 21, when the pressure on the inner side 211 of the umbrella cap 21 is greater than the pressure on the outer side 212, the inner side 211 will be subjected to a pushing force along the inner side 211 towards the outer side 212, causing the edge of the umbrella cap 21 to deform and separate from the shell 10, thereby forming a gap between the edge of the umbrella cap 21 and the shell 10 to open the third vent 101, allowing ventilation between the lamp cavity 210 and the outside atmosphere through the third vent 101, thus realizing the opening action of the air valve 20 in one ventilation direction. Furthermore, by providing a protrusion 11 between the inner side 211 of the umbrella cap 21 and the shell 10, a lever mechanical structure can be formed between the umbrella cap 21 and the protrusion 11, so that the pressure on the inner side 211 of the umbrella cap 21 is less than that on the outer side 212. When subjected to pressure, its outer surface 212 will be subjected to a pushing force along the outer surface 212 towards the inner surface 211. The part of the umbrella cap 21 located between its center and the protrusion 11 can lift the edge of the umbrella cap 21 with the protrusion 11 as the fulcrum, so that the edge of the umbrella cap 21 can deform and separate from the shell 10. That is, the edge of the umbrella cap 21 can lift up with the protrusion 11 as the fulcrum and separate from the shell 10, thereby forming a gap between the edge of the umbrella cap 21 and the shell 10 to open the third vent 101 and allow the lamp cavity 210 to communicate with the outside atmosphere through the third vent 101. This realizes the opening action of the air valve 20 in another ventilation direction. In this way, the bidirectional ventilation function of the air valve 20 with a single valve core structure is realized. Its structure is simple, occupies less space, which is conducive to reducing the overall volume of the anti-fog device 100 and has a low cost.

[0040] Understandably, the installation direction of the air valve 20 can be set according to actual needs, such as... Figure 1 and Figure 3 As shown, the umbrella cap 21 is located on the side of the housing 10 away from the lamp cavity 210, and the inner side 211 of the umbrella cap 21 is disposed facing the lamp cavity 210; or, the umbrella cap 21 is located on the side of the housing 10 facing the lamp cavity 210, and the outer side 212 of the umbrella cap 21 is disposed facing the lamp cavity 210.

[0041] like Figure 3 As shown, with the umbrella cap 21 located on the side of the housing 10 away from the lamp cavity 210 and the inner side 211 of the umbrella cap 21 facing the lamp cavity 210 as an example, the working principle of the gas valve 20 is explained by way of example.

[0042] When the air pressure in the lamp cavity 210 is greater than the air pressure of the outside atmosphere, the pressure on the inner side 211 of the umbrella cap 21 will be greater than the pressure on its outer side 212. At this time, under the action of the pressure difference, the inner side 211 of the umbrella cap 21 will be subjected to a pushing force along the inner side 211 to the outer side 212, so that the edge of the umbrella cap 21 can deform and separate from the shell 10, thereby forming a gap between the edge of the umbrella cap 21 and the shell 10, so as to open the third vent hole 101 and allow the gas in the lamp cavity 210 to be discharged to the outside atmosphere through the third vent hole 101, thereby reducing the air pressure in the lamp cavity 210 to a certain extent, so as to realize the depressurization of the lamp cavity 210, and thus achieve the balance of the pressure difference between the lamp cavity 210 and the outside atmosphere.

[0043] When the air pressure in the lamp cavity 210 is less than the air pressure of the outside atmosphere, the pressure on the inner side 211 of the umbrella cap 21 will be less than the pressure on its outer side 212. At this time, under the action of the pressure difference, the outer side 212 of the umbrella cap 21 will be subjected to a pushing force along the outer side 212 towards the inner side 211, so that the part of the umbrella cap 21 located between its center and the protrusion 11 can lift the edge of the umbrella cap 21 with the protrusion 11 as the fulcrum. That is, the edge of the umbrella cap 21 will lift up with the protrusion 11 as the fulcrum and separate from the shell 10, thereby forming a gap between the edge of the umbrella cap 21 and the shell 10 to open the third vent 101 and allow the gas of the outside atmosphere to enter the lamp cavity 210 through the third vent 101, thereby increasing the air pressure of the lamp cavity 210 to a certain extent, so as to realize the pressure replenishment of the lamp cavity 210, and thus achieve the balance of the pressure difference between the lamp cavity 210 and the outside atmosphere.

[0044] like Figure 3 As shown, in some embodiments, a deformable space 110 is defined between the inner surface 211 and the housing 10. The deformable space 110 is connected to the third vent 101. The protrusion 11 is located within the deformable space 110. The inner surface 211 and the opposite surfaces of the housing 10 jointly define the deformable space 110.

[0045] With the above settings, the portion between the edge and center of the umbrella cap 21 and the shell 10 are spaced apart, and the protrusion 11 can provide a certain support between the umbrella cap 21 and the shell 10, so that the deformation space 110 can be maintained at a certain size in the initial state. The deformation space 110 reduces the contact area between the inner surface 211 of the umbrella cap 21 and the shell 10, preventing adhesion due to excessive contact area. This facilitates deformation of the edge of the umbrella cap 21, separating it from the shell 10, when the inner surface 211 is subjected to a pushing force pointing from the inner surface 211 to the outer surface 212. Simultaneously, the deformation space 110 also provides a recessed space between the center of the umbrella cap 21 and the protrusion 11, allowing the edge of the umbrella cap 21 to be lifted using the protrusion 11 as a fulcrum. Figure 3 As shown, in some embodiments, there are at least two protrusions 11, which are spaced apart circumferentially along the umbrella cap 21. In this way, when the pressure on the inner side 211 of the umbrella cap 21 is less than the pressure on its outer side 212, the part of the umbrella cap 21 located between its center and the protrusions 11 can lift the edge of the umbrella cap 21 with each protrusion 11 as a fulcrum. This is beneficial for the edge of the umbrella cap 21 to lift up with each protrusion 11 as a fulcrum and separate from the shell 10 as a whole and synchronously. This allows the umbrella cap 21 to be supported by the distributed protrusions more evenly, avoiding stress concentration at a single protrusion that could cause irreversible indentation or plastic deformation of the umbrella cap 21, and ensuring that the umbrella cap 21 can return to its original position after the pressure difference disappears.

[0046] Of course, in other embodiments, the number of protrusions 11 may be only one.

[0047] In some embodiments, the number of third vent holes 101 is at least two, and the at least two third vent holes 101 are arranged at intervals along the circumference of the umbrella cap 21. In this way, the gas in the lamp cavity 210 or the gas in the outside atmosphere can flow through each third vent hole 101 in a dispersed manner, thereby improving the uniformity of gas flow and reducing the possibility of local turbulence on the inner surface 211, so that the umbrella cap 21 can be subjected to the force of airflow more evenly. It is understandable that the shape of the third vent 101 can be set according to actual needs. For example, the third vent 101 can be columnar or arc-shaped. The arc-shaped third vent 101 can be formed by extending along the circumference of the umbrella cap 21.

[0048] Of course, in other embodiments, the number of third vent holes 101 may be only one.

[0049] like Figure 3As shown, in some embodiments, the outer surface 212 defines a groove 201, which is located near the edge of the umbrella cap 21 relative to the protrusion 11. That is, the groove 201 is recessed from the outer surface 212 in the direction of the outer surface 212 toward the inner surface 211.

[0050] By setting the groove 201, the portion of the umbrella cap 21 near its edge can be thinned and its weight reduced, making it easier for the edge of the umbrella cap 21 to separate from the shell 10 under the action of pressure difference, thus improving the opening sensitivity of the umbrella cap 21. Specifically, when the pressure on the inner side 211 of the umbrella cap 21 is greater than the pressure on its outer side 212, the portion of the umbrella cap 21 located at the groove 201 can form a flexible hinge structure, allowing the edge of the umbrella cap 21 to bend and deform around the groove 201 to a certain extent, making it easier for the edge of the umbrella cap 21 to separate from the shell 10 under the action of pressure difference.

[0051] In some embodiments, the groove 201 extends circumferentially along the valve 20 to form an annular shape. Thus, the portion of the cap 21 located at the groove 201 can form an annular flexible hinge structure. Under the action of pressure difference, the edge of the cap 21 can rise synchronously and uniformly along the annular groove 201, thereby forming a uniform annular gap between the edge of the cap 21 and the housing 10, which is conducive to the uniform flow of air. After the pressure difference disappears, the edge of the cap 21 can synchronously and uniformly abut against the housing 10 along the annular groove 201.

[0052] In some embodiments, the protrusion 11 is fixed to the housing 10, and the end of the protrusion 11 away from the housing 10 abuts against the umbrella cap 21 to provide support for the umbrella cap 21. The protrusion 11 can be integrally formed with the housing 10, or it can be fixed to the housing 10 by means of bonding, hot melting, welding or other methods.

[0053] By fixing the protrusion 11 to the housing 10, the weight of the umbrella cap 21 can be reduced. When the inner side 211 is subjected to a pushing force along the inner side 211 to the outer side 212, the edge of the umbrella cap 21 is easily separated from the housing 10. At the same time, since the protrusion 11 and the umbrella cap 21 are only in contact, when the outer side 212 is subjected to a pushing force along the inner side 211 to the inner side 211, the inner side 211 can slide a certain amount relative to the protrusion 11 on the protrusion 11, so that the part of the umbrella cap 21 located between its center and the protrusion 11 is easily recessed along the outer side 212 to the inner side 211, thereby making it easier for the edge of the umbrella cap 21 to separate from the housing 10.

[0054] like Figure 3As shown, in some embodiments, the protrusion 11 has an abutment surface 111 located at the end of the protrusion 11 away from the housing 10. The abutment surface 111 abuts against the inner side surface 211. The distance between the abutment surface 111 and the housing 10 gradually decreases along the direction from the center of the umbrella cap 21 to the edge of the umbrella cap 21.

[0055] With the above settings, the contact surface 111 can be adapted to the inner side 211 of the umbrella-shaped cap 21, so that the contact surface 111 can fit as closely as possible to the inner side 211 of the cap 21, so as to provide better support for the cap 21. This helps the cap 21 maintain its umbrella-shaped structure without external force. Furthermore, when the part of the cap 21 located between its center and the protrusion 11 lifts the edge of the cap 21 with the protrusion 11 as the fulcrum, the cap 21 is easy to separate from the side of the contact surface 111 near the edge of the cap 21, and a line contact is formed on the other side of the contact surface 111 away from the edge of the cap 21. This helps to reduce the frictional force between the cap 21 and the protrusion 11, making it easier to lift the edge of the cap 21.

[0056] The contact surface 111 can be either an arc surface or an inclined plane.

[0057] It is understandable that the protrusion 11 can be columnar; the protrusion 11 can also extend circumferentially along the cap 21 to make the protrusion 11 arc-shaped.

[0058] In some embodiments, the first opening pressure at which the gas valve 20 opens the third vent 101 when the gas pressure in the lamp cavity 210 is greater than the outside atmospheric pressure is less than the second opening pressure at which the gas valve 20 opens the third vent 101 when the gas pressure in the lamp cavity 210 is less than the outside atmospheric pressure.

[0059] Specifically, when the air pressure in the lamp cavity 210 minus the air pressure of the outside atmosphere is greater than or equal to the first opening pressure, the umbrella cap 21 will open the third vent hole 101 under the action of the pressure difference, and the gas in the lamp cavity 210 will be exhausted to the outside through the third vent hole 101; when the air pressure in the outside atmosphere minus the air pressure in the lamp cavity 210 is greater than or equal to the second opening pressure, the umbrella cap 21 will open the third vent hole 101 under the action of the pressure difference, and the gas in the outside atmosphere will be introduced into the lamp cavity 210 through the third vent hole 101.

[0060] In this embodiment, by making the first opening pressure less than the second opening pressure, the pressure difference required for the umbrella cap 21 to open the third vent 101 to allow air from the outside atmosphere to enter the lamp cavity 210 is greater than the pressure difference required for the umbrella cap 21 to open the third vent 101 to allow air from the lamp cavity 210 to exhaust from the outside atmosphere. That is, compared to the case where the air pressure in the lamp cavity 210 is greater than the air pressure in the outside atmosphere, when the air pressure in the lamp cavity 210 is less than the air pressure in the outside atmosphere, the umbrella cap 21 is less likely to open the third vent 101. In this way, the possibility of air from the outside atmosphere entering the lamp cavity 210 can be reduced, thereby limiting the entry of water vapor from the outside atmosphere into the lamp cavity 210 under the action of pressure difference, reducing the possibility of fogging in the lamp body 200, and ensuring the anti-fog capability of the anti-fog device 100.

[0061] like Figure 3 As shown, in some embodiments, the housing 10 further defines a connection hole 102. The air valve 20 also includes an umbrella handle 22, which passes through the connecting hole 102 and is connected to the inner side 211. The umbrella handle 22 has a limiting end 221, which is located on the side of the housing 10 away from the umbrella cap 21 and abuts against the housing 10. That is to say, in the initial state, the edge of the umbrella cap 21 and the limiting end 221 abut against the opposite sides of the housing 10, so that there is a certain pre-tightening force between the edge of the umbrella cap 21 and the housing 10, so that the edge of the umbrella cap 21 abuts against the housing 10, thereby allowing the third vent hole 101 to be in a closed state. Furthermore, when the air valve 20 is subjected to a force along the inner side 211 pointing to the outer side 212, the abutting fit between the limiting end 221 and the housing 10 can restrict the air valve 20 from disengaging from the connecting hole 102 in the direction from the inner side 211 to the outer side 212, so that the air valve 20 can be stably installed at the connecting hole 102.

[0062] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of the housing 10 and the air valve 20 in another embodiment of the present invention. In some embodiments, the housing 10 is provided with a protective structure 12 on the side away from the umbrella cap 21. The protective structure 12 surrounds the radial outer side of the limiting end 221, so that the limiting end 221 is located inside the protective structure 12. The protective structure 12 can provide structural protection for the limiting end 221, prevent the limiting end 221 from contacting external objects, and avoid the limiting end 221 being pushed by external objects, causing the air valve 20 to disengage from the connection hole 102. This facilitates the transportation and storage of the anti-fog device 100 after assembly.

[0063] like Figure 3 As shown, in some embodiments, the third vent 101 is located radially outside the connecting hole 102. Thus, the distance between the third vent 101 and the gap between the edge of the umbrella cap 21 and the housing 10 is shorter, which can shorten the gas flow path to a certain extent and improve the ventilation efficiency.

[0064] like Figure 4 As shown, in some other embodiments, the third vent 101 is located on the inner wall of the connecting hole 102 and communicates with the connecting hole 102. This makes the radial layout of the third vent 101 and the connecting hole 102 more compact, reduces the space occupied by the third vent 101 and the connecting hole 102 in the radial direction, and helps to reduce the coverage area of ​​the umbrella cap 21, that is, reduce the volume of the umbrella cap 21.

[0065] like Figure 2 As shown, in some embodiments, the housing 10 further defines a receiving cavity 103 and a first vent 104. The connecting hole 102, the first vent 104, and the third vent 101 are respectively connected to the receiving cavity 103. The first vent 104 is used to connect the receiving cavity 103 and the outside atmosphere, so that the lamp cavity 210 and the outside atmosphere can be vented to each other through the first vent 104, the receiving cavity 103, and the third vent 101. The umbrella cap 21 is located in the receiving cavity 103. The housing 10 can provide structural protection for the umbrella cap 21, preventing the umbrella cap 21 from contacting external objects and avoiding permanent deformation and loss of elasticity due to collisions with external objects.

[0066] like Figure 2 and Figure 3 As shown, in some embodiments, the housing 10 further defines a receiving cavity 103, a first vent 104 and a second vent 105. The first vent 104 is used to connect the receiving cavity 103 to the outside atmosphere, the second vent 105 is used to connect to the lamp cavity 210, and the third vent 101 is used to connect the receiving cavity 103 and the lamp cavity 210.

[0067] The anti-fog device 100 also includes an elastic container 30, which is located in the receiving cavity 103 and connected to the housing 10. The elastic container 30 defines a pressure regulating cavity 301, which is connected to a second vent 105. That is, the pressure regulating cavity 301 is connected to the lamp cavity 210 through the second vent 105. The elastic container 30 is configured to be able to extend along its axial direction to a first limit state or contract along its axial direction to a second limit state, and adjust the gas volume of the pressure regulating cavity 301 to balance the pressure difference between the lamp cavity 210 and the outside atmosphere, thereby limiting the entry of water vapor from the outside atmosphere into the interior of the lamp 1000 under the action of the pressure difference, thereby reducing the possibility of fogging in the lamp body 200.

[0068] When the elastic container 30 extends to its first limit state and the air pressure in the lamp cavity 210 is greater than the air pressure of the outside atmosphere, the edge of the umbrella cap 21 separates from the shell 10. When the elastic container 30 contracts to its second limit state and the air pressure in the lamp cavity 210 is less than the air pressure of the outside atmosphere, the edge of the umbrella cap 21 lifts up with the protrusion 11 as the fulcrum and separates from the shell 10.

[0069] In this embodiment, through the coordinated operation of the gas valve 20 and the elastic container 30, when there is a pressure difference between the lamp cavity 210 and the outside atmosphere, the pressure regulating chamber 301 of the elastic container 30 can preferentially communicate with the lamp cavity 210 through the second vent 105 to achieve the initial balance of the pressure difference between the lamp cavity 210 and the outside atmosphere. When the elastic container 30 extends to the first limit state or contracts to the second limit state, that is, when the elastic container 30 can no longer achieve the balance of the pressure difference between the lamp cavity 210 and the outside atmosphere, the gas valve 20 opens the third vent 101 under the action of the pressure difference to allow gas to flow between the lamp cavity 210 and the outside atmosphere, thereby achieving the secondary balance of the pressure difference between the lamp cavity 210 and the outside atmosphere and preventing the lamp cavity 210 from being kept in a high-pressure or low-pressure state.

[0070] The working principle of the anti-fog device 100 will be described by way of example below. For ease of explanation, the space between the outer surface of the elastic container 30 and the inner wall of the receiving cavity 103 will be referred to as the air cavity.

[0071] In the initial state, the air pressure in the lamp cavity 210 is in equilibrium with the air pressure of the outside atmosphere, and the elastic container 30 is in a natural expansion and contraction state. That is, the elastic container 30 does not expand or contract under the action of pressure difference.

[0072] When the air pressure in the lamp cavity 210 is greater than the air pressure of the outside atmosphere, some of the gas inside the lamp cavity 210 will preferentially be discharged to the pressure regulating chamber 301 through the second vent 105 to depressurize the lamp cavity 210. During the inflation process, the air pressure inside the elastic container 30 increases, causing the elastic container 30 to stretch and deform, and the gas volume of the pressure regulating chamber 301 increases. At the same time, during the stretching process, the elastic container 30 will displace the gas in the air chamber, causing some of the gas in the air chamber to be discharged to the outside atmosphere through the first vent 104. When the pressure difference between the lamp cavity 210 and the outside atmosphere is balanced, the pressure difference effect disappears, the elastic container 30 stops stretching, the lamp cavity 210 stops venting to the pressure regulating chamber 301, and the air chamber stops venting to the outside atmosphere, thus achieving the initial balance of the pressure difference between the lamp cavity 210 and the outside atmosphere by the elastic container 30.

[0073] During the initial pressure differential balancing process of the above elastic container 30, the pressure differential effect is mainly concentrated in the elastic container 30, and the air valve 20 can still remain in the state of closing the third vent 101. If the elastic container 30 is stretched to its first limit state and the air pressure in the lamp cavity 210 is still greater than the air pressure of the outside atmosphere, the lamp cavity 210 cannot continue to exhaust air into the pressure regulating chamber 301 to relieve pressure. At this time, the pressure difference will mainly be concentrated on the air valve 20. Under the action of the pressure difference, the air valve 20 will deform and open the third vent 101, so that the lamp cavity 210 and the receiving chamber 103 are connected to each other through the third vent 101. In this way, the lamp cavity 210 can continue to exhaust air into the outside atmosphere through the third vent 101, the receiving chamber 103 and the first vent 104 in sequence to continue to relieve pressure until the pressure difference between the lamp cavity 210 and the outside atmosphere is balanced. When the pressure difference disappears, the air valve 20 will restore its deformation and close the third vent 101. The lamp cavity 210 will stop exhausting air through the third vent 101, thereby achieving a secondary balance of the pressure difference between the lamp cavity 210 and the outside atmosphere by the air valve 20.

[0074] When the air pressure in the lamp cavity 210 is lower than the air pressure of the outside atmosphere, the gas in the pressure regulating chamber 301 will preferentially flow into the lamp cavity 210 through the second vent 105 to replenish the pressure of the lamp cavity 210. During the degassing process, the air pressure inside the elastic container 30 decreases, causing the elastic container 30 to contract and deform, and the gas volume of the pressure regulating chamber 301 decreases. At the same time, during the contraction process of the elastic container 30, the gas volume of the air cavity increases, and the gas from the outside atmosphere enters the air cavity through the first vent 104. When the pressure difference between the lamp cavity 210 and the outside atmosphere is balanced, the pressure difference effect disappears, the elastic container 30 stops contracting and entering the lamp cavity 210, and the outside atmosphere stops entering the air cavity, thereby achieving the initial balance of the pressure difference between the lamp cavity 210 and the outside atmosphere by the elastic container 30.

[0075] During the initial pressure balance process of the elastic container 30, the pressure difference effect of the lamp cavity 210 is mainly concentrated in the elastic container 30, and the air valve 20 can still remain in the state of closing the third vent 101. If the elastic container 30 contracts to its second limit state, and the air pressure in the lamp cavity 210 is still lower than the air pressure of the outside atmosphere, the pressure regulating chamber 301 cannot continue to supply air to the pressure regulating chamber 301 to replenish the pressure of the lamp cavity 210. At this time, the pressure difference effect will mainly be concentrated on the air valve 20. Under the action of the pressure difference, the air valve 20 will deform and open the third vent 101, so that the lamp cavity 210 and the receiving chamber 103 are connected to each other through the third vent 101. In this way, the outside atmosphere can continue to supply air to the lamp cavity 210 through the first vent 104, the receiving chamber 103 and the third vent 101 in sequence to replenish the pressure of the lamp cavity 210 until the pressure difference between the lamp cavity 210 and the outside atmosphere is balanced. When the pressure difference effect disappears, the air valve 20 returns to its deformation and closes the third vent 101. The outside atmosphere stops supplying air to the lamp cavity 210, thereby achieving a secondary balance of the pressure difference between the lamp cavity 210 and the outside atmosphere through the air valve 20.

[0076] In some embodiments, the elastic container 30 has a fixed end 30a and a free end 30b that are axially opposite to each other. The fixed end 30a is connected to the housing 10 and is fixed relative to the housing 10. The elastic container 30 can extend in the direction from the fixed end 30a to the free end 30b, so that the free end 30b gradually moves away from the fixed end 30a and increases the gas volume of the pressure regulating chamber 301, or contract in the direction from the free end 30b to the fixed end 30a, so that the free end 30b gradually moves closer to the fixed end 30a and decreases the gas volume of the pressure regulating chamber 301.

[0077] Specifically, when the elastic container 30 extends along its axial direction to the first limit state, the free end 30b can basically no longer move away from the fixed end 30a along the axial direction, and the distance between the free end 30b and the fixed end 30a is the largest, that is, the elastic container 30 has the largest size in its axial direction; the elastic container 30 can also contract along its axial direction to the second limit state, at which point the free end 30b can basically no longer move towards the fixed end 30a along the axial direction, and the distance between the free end 30b and the fixed end 30a is the smallest, that is, the elastic container 30 has the smallest size in its axial direction.

[0078] With the above settings, during the reciprocating expansion and contraction process of the elastic container 30, which is the positional change process of the free end 30b moving away from or closer to the fixed end 30a along the axial direction of the elastic container 30, the elastic deformation path of the elastic container 30 is repeatable and controllable, which is beneficial to the long-term stable use of the elastic container 30.

[0079] Furthermore, during the expansion and contraction of the elastic container 30 along its axial direction, its main change is in its axial dimension, while its radial dimension remains largely unchanged or changes relatively little. Consequently, its radial space occupancy is relatively small. This allows for a suitable reduction in the radial dimension of the shell 10, making its radial structure more compact with that of the elastic container 30, thereby reducing the overall volume of the anti-fog device 100.

[0080] The opening of the pressure regulating chamber 301 is located at the fixed end 30a.

[0081] like Figure 2 As shown, in some embodiments, a crease is provided between the fixed end 30a and the free end 30b. The crease includes multiple sub-creases 30c, which are arranged along the axial direction of the elastic container 30 and connected sequentially. When the elastic container 30 extends in the direction from the fixed end 30a to the free end 30b, each pair of adjacent sub-creases 30c moves away from each other along the axial direction of the elastic container 30, so that the free end 30b gradually moves away from the fixed end 30a and increases the gas volume of the pressure regulating chamber 301. When the elastic container 30 contracts in the direction from the free end 30b to the fixed end 30a, each pair of adjacent sub-creases 30c moves closer to each other along the axial direction of the elastic container 20, so that the free end 30b gradually moves closer to the fixed end 30a and decreases the gas volume of the pressure regulating chamber 301. By setting the sub-folds 30c, the elastic container 30 is formed into a 100-fold structure. In this way, the elastic container 30 has a strong directional expansion and contraction capability. Under the action of pressure difference, the elastic container 30 can expand and contract along its axis, realizing the repeatability and controllability of the elastic deformation path of the elastic container 30, which is conducive to the long-term stable use of the elastic container 30.

[0082] Specifically, the multiple sub-folds 30c include multiple inner folds and multiple outer folds. The bending direction of the inner folds is opposite to that of the outer folds. The inner folds are closer to the central axis of the elastic container 30 than the outer folds. Both the inner and outer folds are arranged around the central axis of the elastic container 30. The inner and outer folds are alternately distributed along the axial direction of the elastic container 30, thereby forming a 100-fold structure for the elastic container 30.

[0083] In other embodiments, the elastic container 30 may also be in other shapes and structures, and is not limited to the pleated structure described above. For example, the elastic container 30 may be spherical or bulb-shaped.

[0084] In some embodiments, the flexible container 30 is made of silicone.

[0085] like Figure 2As shown, in some embodiments, the housing 10 includes a first sub-shell 13 and a second sub-shell 14 that are separately configured. The elastic container 30 is connected to the first sub-shell 13, and the second sub-shell 14 is connected to the first sub-shell 13. The first sub-shell 13 and the second sub-shell 14 together cover the elastic container 30, and the first sub-shell 13 and the second sub-shell 14 together define a storage cavity 103. By using the separately configured first sub-shell 13 and the second sub-shell 14, during assembly, the elastic container 30 can be fixed to the first sub-shell 13 first for assembly, and then the second sub-shell 14 can be fixed to the first sub-shell 13. This achieves the feasibility of assembling the housing 10 and the elastic container 30. Furthermore, when the elastic container 30 is assembled with the first sub-shell 13, the second sub-shell 14 does not obstruct the assembly position of the elastic container 30, providing a larger operating space and facilitating assembly.

[0086] like Figure 2 As shown, regarding the location layout of each vent, in some embodiments, the housing 10 has a first side 10a and a second side 10b that are axially opposite to each other along the elastic container 30. The second vent 105 is located on the first side 10a, and the second vent 105 and the third vent 101 are respectively located on the second side 10b. The first side 10a is set away from the lamp body 200, and the second side 10b is set towards the lamp body 200.

[0087] With the above arrangement of the vent positions, on the one hand, during installation, the anti-fog device 100 can be installed on the lamp body 200 along the axial direction of the elastic container 30 with its first side 10a facing the lamp body 200. This allows the first vent 104 to be exposed on the first side 10a of the housing 10 away from the lamp body 200 after the anti-fog device 100 is installed on the lamp body 200, so as to allow ventilation with the outside atmosphere. The second vent 105 and the third vent 101 can be connected to the lamp cavity 210 respectively, so as to allow ventilation with the lamp cavity 210. On the other hand, when the air valve 20 opens the third vent 101, the direction of the pressure difference is consistent with the axial direction of the elastic container 30. Gas can flow from the first side 10a to the second side 10b, or from the second side 10b to the first side 10a, along the axial direction of the elastic container 30, which can increase the gas flow rate and facilitate the exhaust or intake of the lamp cavity 210.

[0088] It is understandable that, due to the elastic properties of the elastic container 30, it may still undergo excessive bending deformation, which is not conducive to the stability of the elastic container 30 in its axial reciprocating expansion and contraction. For example, when the anti-fog device 100 is installed on the vehicle's lamp body 2000, if the vehicle experiences undulation or turning during driving, the free end 30b of the elastic container 30 may deviate from the axial direction under its own inertial force, resulting in excessive bending deformation of the elastic container 30.

[0089] In view of this, such as Figure 2 As shown, in some embodiments, the housing 10 is provided with a limiting structure located radially outside the elastic container 30. The limiting structure is used to restrict the elastic container 30 from deviating from its axial direction. Thus, when the free end 30b of the elastic container 30 deviates from its axial direction, the limiting structure can correct the deviation of the free end 30b, so that the free end 30b is reset under the elastic force of the elastic container 30 itself, thereby achieving the limiting effect on the elastic container 30, preventing excessive bending deformation of the elastic container 30, and helping to ensure the stability of the elastic container 30 in its axial reciprocating expansion and contraction.

[0090] like Figure 2 As shown, in some embodiments, the limiting structure includes a limiting plate 15, which and the inner wall of the receiving cavity 103 together surround the radial outer side of the elastic container 30 and are used to limit the elastic container 30 from deviating from the axial direction of the elastic container 30.

[0091] With the above configuration, the inner walls of the limiting plate 15 and the receiving cavity 103 surround the elastic container 30 along the circumference of the elastic container 30. No matter which radial direction the free end 30b deviates from the axial direction of the elastic container 30, it can be corrected by the limiting plate 15 or the inner wall of the receiving cavity 103. Furthermore, by using the inner wall of the receiving cavity 103 of the housing 10 itself to cooperate with the limiting plate 15, the area enclosed by the limiting plate 15 on the elastic container 30 can be reduced, and the space occupied by the limiting plate 15 in the receiving cavity 103 can be reduced, which helps to make the overall structure of the anti-fog device 100 more compact.

[0092] In some embodiments, the air valve 20 is located radially outside the elastic container 30, and the air valve 20 and the limiting plate 15 are spaced apart along the axial direction of the elastic container 30.

[0093] With the above settings, the air valve 20 and the limiting plate 15 are located on the same side of the elastic container 30 in the radial direction. The limiting plate 15 can restrict the elastic container 30 from deviating to the side where the air valve 20 is located during the extension and retraction process, so as to avoid the elastic container 30 affecting the airflow on the side where the air valve 20 is located. At the same time, the radial layout of the limiting plate 15 and the air valve 20 is relatively compact, reducing the space occupied by the limiting plate 15 and the air valve 20 in the radial direction, which is conducive to reducing the overall volume of the anti-fog device 100.

[0094] To avoid interference between the crease and the valve 20, such as Figure 2 and Figure 3As shown, in some embodiments, the housing 10 is provided with an isolation structure 16, which is located radially outside the air valve 20. Along the axial direction of the elastic container 30, the projection of the isolation structure 16 is at least partially located within the projection of the elastic container 30. The isolation structure 16 is used to isolate the crease and the air valve 20 in the axial direction of the elastic container 30, thereby providing isolation protection for the air valve 20. In this way, even if the elastic container 30 contracts along its axial direction and the crease gradually approaches the air valve 20, the crease will be stopped by the isolation structure 16 when it moves a certain distance, so as to prevent the crease from interfering with the air valve 20 and avoid the crease from affecting the normal operation of the air valve 20.

[0095] In some embodiments, the isolation structure 16 extends circumferentially along the air valve 20, thereby providing better isolation protection for the air valve 20 in the circumferential direction.

[0096] Since the first vent 104 needs to be in contact with the outside atmosphere, after the gas from the outside atmosphere enters the receiving cavity 103 through the first vent 104, the water vapor carried by the gas from the outside atmosphere will also enter the receiving cavity 103. Therefore, the water vapor from the outside atmosphere needs to be isolated at the first vent 104.

[0097] like Figure 2 As shown, the anti-fog device 100 also includes a waterproof and breathable membrane 40, which covers the first vent 104. The waterproof and breathable membrane 40 has dual functions of waterproofing and breathability. While allowing gas to enter and exit the receiving cavity 103, it can isolate external moisture and prevent external moisture from entering the receiving cavity 103 through the first vent 104, which could cause the receiving cavity 103 to become damp or even accumulate water. This prevents external atmospheric moisture from entering the lamp cavity 210 through the third vent 101 when the air valve 20 opens, thereby reducing the possibility of fogging in the lamp body 200.

[0098] Of course, in addition to being waterproof, the waterproof and breathable membrane 40 can also prevent dust and other debris from entering the storage cavity 103.

[0099] like Figure 1 As shown, this embodiment of the invention also provides a lamp 1000, which includes the lamp body 200 and the anti-fog device 100 described above. The lamp body 200 defines a mounting hole 220, and the housing 10 is mounted in the mounting hole 220. During installation, the first side 10a of the housing 10 extends into the lamp cavity 210 through the mounting hole 220, and the second side 10b of the housing 10 is located outside the mounting hole 220.

[0100] The lamp 1000 of this embodiment of the invention has the beneficial effects of the anti-fog device 100, which will not be described in detail here.

[0101] This invention also provides a vehicle, which includes the aforementioned lamp 1000.

[0102] The vehicle of this embodiment of the invention has the beneficial effects of the anti-fog device 100, which will not be described in detail here.

[0103] It should be noted that the vehicles referred to in the embodiments of the present invention can be private cars, such as sedans, SUVs, MPVs, or pickup trucks. Vehicles can also be commercial vehicles, such as vans, buses, or trucks. Vehicles can be gasoline-powered vehicles or new energy vehicles. When a vehicle is a new energy vehicle, it can be a hybrid vehicle or a pure electric vehicle.

[0104] It should be noted that the vehicle provided in the embodiments of the present invention only shows the part related to the technical problem to be solved by the embodiments of the present invention. It can be understood that the vehicle provided in the embodiments of the present invention also includes other structures for realizing the functions of the vehicle, including but not limited to the vehicle body.

[0105] Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of the invention. Furthermore, embodiments of the invention and features thereof can be combined with each other, unless otherwise specified.

Claims

1. Anti-fog device for mounting on a lamp body, said lamp body having a lamp cavity, characterized in that, include: The housing defines a third vent, which is used to connect the lamp cavity to the outside atmosphere; An air valve is provided at the third vent. The air valve includes an umbrella cap, the edge of which is sealed against the housing to close the third vent. The umbrella cap has an inner side and an outer side, and a protrusion is provided between the inner side and the housing. When the pressure on the inner side is greater than the pressure on the outer side, the edge of the umbrella cap separates from the housing and opens the third vent. When the pressure on the inner side is less than the pressure on the outer side, the edge of the umbrella cap rises with the protrusion as a fulcrum and separates from the housing, opening the third vent.

2. The anti-fog device according to claim 1, characterized in that, A deformation space is defined between the inner side and the shell, the deformation space is connected to the third vent, and the protrusion is located within the deformation space.

3. The anti-fog device according to claim 1, characterized in that, The number of protrusions is at least two, and the at least two protrusions are spaced apart circumferentially along the umbrella cap; And / or, the number of the third vent holes is at least two, and the at least two third vent holes are arranged at circumferential intervals along the umbrella cap.

4. The anti-fog device according to claim 1, characterized in that, The outer surface defines a groove that is close to the edge of the umbrella cap relative to the protrusion.

5. The anti-fog device according to claim 4, characterized in that, The groove extends circumferentially along the valve to form a ring shape.

6. The anti-fog device according to claim 1, characterized in that, The protrusion is fixed to the housing, and the end of the protrusion away from the housing abuts against the umbrella cap.

7. The anti-fog device according to claim 6, characterized in that, The protrusion has an abutting surface located at the end of the protrusion away from the housing. The abutting surface abuts against the inner side surface. The distance between the abutting surface and the housing gradually decreases along the direction from the center of the umbrella cap to the edge of the umbrella cap.

8. The anti-fog device according to claim 1, characterized in that, The first opening pressure at which the gas valve opens the third vent when the gas pressure in the lamp cavity is greater than the outside atmospheric pressure is less than the second opening pressure at which the gas valve opens the third vent when the gas pressure in the lamp cavity is less than the outside atmospheric pressure.

9. The anti-fog device according to claim 1, characterized in that, The housing also defines a connection hole; The air valve also includes an umbrella handle, which passes through the connecting hole and is connected to the inner side. The umbrella handle has a limiting end, which is located on the side of the housing away from the umbrella cap and abuts against the housing.

10. The anti-fog device according to claim 9, characterized in that, The shell has a protective structure on the side opposite to the umbrella cap, and the protective structure surrounds the outer periphery of the limiting end.

11. The anti-fog device according to claim 9, characterized in that, The third vent is located radially outside the connecting hole, or the third vent is located on the inner wall of the connecting hole and communicates with the connecting hole.

12. The anti-fog device according to claim 1, characterized in that, The housing further defines a storage cavity and a first vent hole, the first vent hole and the third vent hole being respectively connected to the storage cavity. The first vent hole is used to connect the storage cavity to the outside atmosphere, and the umbrella cap is located in the storage cavity.

13. The anti-fog device according to claim 1, characterized in that, The housing further defines a storage cavity, a first vent hole and a second vent hole, the first vent hole being used to connect the storage cavity to the outside atmosphere, the second vent hole being used to connect to the lamp cavity, and the third vent hole being used to connect the storage cavity and the lamp cavity. The anti-fog device further includes an elastic container located in the receiving cavity and connected to the housing. The elastic container defines a pressure regulating cavity that communicates with the second vent. The elastic container is configured to extend to a first limit state or retract to a second limit state, and to adjust the gas volume of the pressure regulating cavity. When the elastic container extends to the first limit state and the air pressure in the lamp cavity is greater than the air pressure of the outside atmosphere, the edge of the umbrella cap separates from the shell; when the elastic container contracts to the second limit state and the air pressure in the lamp cavity is less than the air pressure of the outside atmosphere, the edge of the umbrella cap lifts up with the protrusion as the fulcrum and separates from the shell.

14. The anti-fog device according to claim 12 or 13, characterized in that, The anti-fog device also includes a waterproof and breathable membrane, which covers the first vent.

15. A lighting fixture, characterized in that, The device includes a lamp body and an anti-fog device as described in any one of claims 1 to 14, wherein the lamp body defines a mounting hole and the housing is mounted in the mounting hole.

16. A vehicle, characterized in that, Including the luminaire as described in claim 15.

Images