CN214064811U - Prevent drier ventilated membrane subassembly of car light fogging - Google Patents
Prevent drier ventilated membrane subassembly of car light fogging Download PDFInfo
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- CN214064811U CN214064811U CN202023248400.4U CN202023248400U CN214064811U CN 214064811 U CN214064811 U CN 214064811U CN 202023248400 U CN202023248400 U CN 202023248400U CN 214064811 U CN214064811 U CN 214064811U
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Abstract
The utility model discloses a prevent drier ventilated membrane subassembly of car light hazing installs in the back of car light lamp body, and the back of car light lamp body is equipped with a plurality of air vents, including inside cavity and both ends open-ended casing, seal respectively at the waterproof ventilated membrane of first PTFE at casing both ends and the waterproof ventilated membrane of second PTFE that ventilative volume is greater than the waterproof ventilated membrane of first PTFE, fill at the inside reversible drier of casing, and be fixed in heater and the circuit board of the inside electricity of casing and be connected. The second PTFE waterproof breathable film is covered on the vent hole, and the heater can heat the reversible drying agent to release the generated water vapor to the outside through the first PTFE waterproof breathable film. The utility model discloses can reduce the suction of vapor, also can initiatively discharge vapor, make the car light not receive the influence of the environmental factor such as the difference in temperature round the clock or air humidity is very big, further eliminate the inside fog of car light, avoid arousing the condensation phenomenon.
Description
Technical Field
The utility model relates to an automobile lamp technical field, in particular to prevent drier ventilation membrane subassembly of car light fogging.
Background
Under weather conditions with large day-night temperature difference or large humidity, moisture in the external environment can diffuse into the air inside the vehicle lamp through three different transfer mechanisms: (1) water vapor adsorption of plastic parts and housing materials of vehicle lamps; (2) water vapor permeates the plastic housing and lens material of the vehicle lamp; (3) convection and diffusion through the ventilation system of the vehicle lamp transfers moisture to the air inside the vehicle lamp. If the water vapor in the lamp can not sufficiently flow and diffuse to the external environment, and the high humidity is still maintained, the fogging phenomenon occurs when the temperature of some areas in the lamp is lower than the local critical temperature of the water vapor. Fog appears in the car light can seriously influence the luminousness and the illuminating effect of car light, and then buries the potential safety hazard to driving safety.
How to effectively reduce the fog of the car lamp is always a pain point in the car lamp industry. The existing solutions to the problem of vehicle lamp fogging are effective to a certain extent, and their effectiveness depends mainly on random variables such as ambient temperature and pressure, operating/ambient conditions, etc., and whether the vehicle is in a moving or stationary state. At present, the main solutions are: (1) convective systems (rubber tubes/caps with labyrinth or open-cell foam, or breathable caps with non-woven cloth material) provide little diffusive moisture transport; (2) diffuser systems with e-PTFE membrane vents provide continuous pressure equalization and prevent dust and water ingress in many application scenarios. Membrane vents transfer moisture (by diffusion) out of the vehicle lamp housing, whether moving or stationary, however, such diffusion is a passive process that depends on environmental conditions and vehicle lamp internal conditions; (3) the antifogging coating can not remove any water, and water drops can not be attached to the surface of the antifogging coating by changing the tension of the surface of the lens in the automobile lamp; (4) non-regenerable desiccant sachets which, depending on the amount and relative humidity of the desiccant, can operate for weeks or months and become spent after they become saturated with water; (5) the fan (blowing hot air from the heat sink to the lens) dries the lens of the lamp faster, but does not lower the dew point or reduce the moisture in the lamp housing.
In the above scheme, the application and use of the PTFE waterproof breathable film and the structural components thereof are wide. Generally, the PTFE waterproof breathable film is mainly used for reducing the possibility that fog is absorbed into a lamp shell as much as possible by controlling the pressure difference between the inside and the outside of a vehicle lamp so as to relieve the fog, the fog is passively eliminated, and the possibility that the fog is absorbed still exists.
Disclosure of Invention
An object of the utility model is to provide a can reduce the suction of vapor, also can initiatively discharge vapor, make the interior outer air pressure difference of car light as little as possible prevent the drier ventilation membrane subassembly of car light fogging.
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model provides a prevent drier ventilated membrane subassembly of car light fogging installs in the back of car light lamp body, the back of car light lamp body is equipped with a plurality of air vents, prevent drier ventilated membrane subassembly of car light fogging includes: the waterproof drying device comprises a shell, a first PTFE waterproof breathable film, a second PTFE waterproof breathable film, a heater and a circuit board, wherein the shell is hollow, two ends of the shell are opened, the first PTFE waterproof breathable film is sealed at one end of the shell, the second PTFE waterproof breathable film is sealed at the other end of the shell, the air permeability of the second PTFE waterproof breathable film is larger than that of the first PTFE waterproof breathable film, the second PTFE waterproof breathable film covers the air vent, a reversible drying agent is filled in the shell, the heater and the circuit board are electrically connected and fixed in the shell, and the heater can heat the reversible drying agent to enable generated water vapor to be released to the outside through the first PTFE waterproof breathable film. The ventilative volume of the waterproof ventilated membrane of second PTFE is greater than the ventilative volume of the waterproof ventilated membrane of first PTFE, and it is right to help reducing the waterproof ventilated membrane of second PTFE the utility model discloses a prevent the interference of the ventilative volume of the drier ventilated membrane subassembly of car light fogging, make the utility model discloses a prevent that the size of the ventilative volume of the drier ventilated membrane subassembly of car light fogging mainly by the waterproof ventilated membrane control of first PTFE, avoid the waterproof ventilated membrane of second PTFE to influence pressure balance's time, lead to pressure differential uncontrollable.
Preferably, the first PTFE waterproof and breathable film has a protection rating of IPX7 or IPX8 and an air permeability in the range of 100 to 5000ml/cm @ min @70 mbar.
Preferably, the protection grade of the first PTFE waterproof and breathable film is IP68, and the air permeability is 800-1500 ml/cm/min @70 mbar.
Preferably, the protection grade of the first PTFE waterproof and breathable film is IP67, and the air permeability is 2000-3000 ml/cm/min @70 mbar.
Preferably, the first PTFE waterproof and breathable film is an E-PTFE waterproof and breathable film, or a waterproof and breathable film formed by compounding PTFE + polyester non-woven fabric, PTFE + polypropylene non-woven fabric, PTFE + PP grids, or PTFE + polyester fabric.
Preferably, the first PTFE waterproof breathable film and the second PTFE waterproof breathable film are sealed at two ends of the shell in a welding mode, and the welding mode is ultrasonic welding, hot melting welding or high-frequency welding.
Preferably, the material of the shell is a PP polymer resin, or a PBT polymer resin, or a PA polymer resin, or a PC polymer resin, or a glass fiber reinforced polycarbonate composite.
Preferably, the reversible desiccant is an alumina desiccant or a silica gel desiccant, and the filling amount of the reversible desiccant in the shell is 80-100%.
Preferably, the second PTFE waterproof breathable film is a waterproof breathable film formed by compounding PTFE + polyester non-woven fabric, and the micropore size of the second PTFE waterproof breathable film is 2-10 mu m.
Preferably, the heater comprises at least two electric heating elements which are perpendicular to each other, the circuit board is provided with a plurality of mounting holes, and the electric heating elements are vertically fixed on the circuit board through the mounting holes.
Adopt above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a prevent that drier permeable membrane subassembly of car light fogging can reduce the suction of vapor, also can initiatively discharge vapor, make the car light not receive the influence of the environmental factor such as the difference in temperature round the clock or air humidity is very big, further eliminate the inside fog of car light, avoid arousing the condensation phenomenon.
2. The utility model discloses a protection level of the waterproof ventilated membrane of first PTFE can reach IPX7 or IPX8, selects suitable ventilative volume, enables the utility model discloses a prevent that drier ventilated membrane subassembly of car light fogging is little as far as possible at the pressure differential of car light during operation both sides, makes in still less vapor is inhaled the car light, can effectively reduce the water uptake of reversible drier, prevents the too early inefficacy of reversible drier. When the automobile lamp works, the metal heating sheet heats the reversible drying agent, positive pressure difference is formed between the inside and the outside of the automobile lamp, and water vapor is released to the outside of the shell, so that the drying agent recovers the effect of absorbing the water vapor.
Drawings
Fig. 1 is a schematic perspective view of a preferred embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a preferred embodiment of the present invention.
The waterproof drying device comprises a shell 1, a first PTFE waterproof breathable film 2, a second PTFE waterproof breathable film 3, a heater 4, a circuit board 5 and a reversible drying agent 6.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
As shown in fig. 1 and 2, the desiccant breathable membrane assembly for preventing fog of the vehicle lamp comprises a shell 1, a first PTFE waterproof breathable membrane 2, a second PTFE waterproof breathable membrane 3, a heater 4, a circuit board 5 and a reversible desiccant 6. The inside cavity and both ends opening of casing 1, the one end of casing 1 is sealed has first waterproof ventilated membrane of PTFE 2, and the other end is sealed has waterproof ventilated membrane of second PTFE 3, and the ventilative volume of waterproof ventilated membrane of second PTFE 3 is greater than the ventilative volume of first waterproof ventilated membrane of PTFE 2, and casing 1 is inside to be fixed with circuit board 5 and the heater 4 of being connected with circuit board 5 electricity to at the inside reversible drier 6 of packing of casing 1. The utility model discloses a prevent drier ventilated membrane subassembly that car light hazed from installing in the back of car light lamp body, the back of car light lamp body is equipped with a plurality of air vents, and the waterproof ventilated membrane 3 of second PTFE covers on this a plurality of air vents, and heater 4 is used for heating reversible drier 6, makes the vapor of production release the external world through the waterproof ventilated membrane 2 of first PTFE.
The shell 1 is made of a high-temperature-resistant, aging-resistant and thermal deformation-resistant polymer composite material and can be used at 150 ℃ for a long time, and PP (polypropylene) polymer resin, PBT (polybutylene terephthalate) polymer resin, PA (polyamide) polymer resin, PC (polycarbonate) polymer resin or glass fiber reinforced polycarbonate can be selected.
The first PTFE waterproof breathable film 2 has a protection level of IPX7 or IPX8, and a breathable amount in the range of 100 to 5000 ml/cm/min @70mbar, and the type thereof can be selected from an E-PTFE waterproof breathable film, a waterproof breathable film formed by combining PTFE and polyester non-woven fabrics, a waterproof breathable film formed by combining PTFE and polypropylene non-woven fabrics, a waterproof breathable film formed by combining PTFE and PP meshes, or a waterproof breathable film formed by combining PTFE and polyester fabrics. The proper air permeability is selected for the first PTFE waterproof breathable film 2 with different protection grades, so that the pressure difference between the inner side and the outer side of the assembly is as small as possible, a small pressure difference is formed, less water vapor is absorbed, the water absorption capacity of the reversible desiccant 6 is effectively reduced, and the premature failure of the desiccant is prevented. The utility model discloses a preferred protection grade of waterproof ventilated membrane 2 of PTFE is IP67 and IP68, and when the protection grade was IP67, the ventilative volume was selected in 2000 ~ 3000 ml/cm/min @70mbar scope, when the protection grade was IP68, the ventilative volume was selected in 800 ~ 1500 ml/cm/min @70mbar scope, help reducing the pressure differential inside and outside the casing 1 to the maximum extent like this, made the inspiratory capacity of vapor reach fewest.
The waterproof ventilated membrane 3 of second PTFE prevents that the piece of drier from getting into the car light lamp body inside, forms "hanging on the speculum of car light and flows", and then influences the reflection of light effect of car light. The air permeability of the second PTFE waterproof breathable film 3 is far greater than that of the first PTFE waterproof breathable film 2, the size of the micropores can be selected within the range of 2-10 microns, and the interference of the second PTFE waterproof breathable film 3 on the air permeability is favorably eliminated, so that the time of pressure discharge balance is influenced, and the pressure difference is uncontrollable. In this embodiment, the second PTFE waterproof breathable film 3 is a waterproof breathable film formed by combining PTFE and polyester non-woven fabric, and the gram weight of the polyester non-woven fabric is 100g/m, which can increase the stiffness of the second PTFE waterproof breathable film 3.
Generally speaking, the joining of the PTFE waterproof breathable film and other components is mainly performed by means of bonding and welding, and in some cases, welding is more practical than bonding.
The working temperature range of the heater 4 is between room temperature and 150 ℃, and the selection of the specific temperature depends on the physical characteristics of the reversible drying agent 6 filled in the shell 1. In this embodiment, the heater 4 includes at least two mutually perpendicular electrical heating elements, and the circuit board 5 is provided with a plurality of mounting holes through which the electrical heating elements are perpendicularly fixed on the circuit board 5. It can be understood that the heater 4 and the circuit board 5 can be fixed in various ways such as clamping, for example, the clamping can be designed into a clamping groove in the mounting hole of the circuit board 5, the electric heating element is provided with a corresponding buckle, the circuit board 5 and the electric heating element are fixedly connected through the clamping groove buckle, and the electric heating element can be stably fixed on the circuit board 5 because the electric heating elements which are perpendicular to each other form a stable supporting structure. As shown in fig. 1, the heater 4 is located at the center of the housing 1, and the heater 4 can be in full contact with the reversible drying agent 6, so that the reversible drying agent 6 can be heated more uniformly, and the heating effect of the heater 4 is better.
The utility model discloses a reversible desiccant 6, the filling volume in casing 1 is 80% ~ 100%, for not containing inflammable solvent, high, the incombustible organic solid of melting point, optional alumina desiccant or silica gel desiccant, when reversible desiccant 6's drying temperature is less than 120 ℃, preferred drying temperature is 110 ℃'s silica gel desiccant. When the reversible drying agent 6 is used, the operating temperature of the heater 4 is strictly controlled so as not to cause melting or decomposition of the reversible drying agent 6, depending on the drying temperature of the reversible drying agent 6.
The utility model discloses a theory of operation does: the car light during operation, the utility model discloses a heater 4 heats reversible drier 6, and simultaneously, the temperature in the car light also slowly risees, forms the normal pressure, and reversible drier 6 is released the vapor that releases because of the heating in being released the outer atmospheric environment of car light through the waterproof ventilated membrane 2 of first PTFE, and then makes reversible drier 6 resume the effect of adsorbing vapor again. When the car light is turned off, the electric heater stops heating, at the moment, the first PTFE waterproof breathable film 2 starts to play a role in pressure balance, and under the condition that the expected protection level is met, the larger the air permeability of the first PTFE waterproof breathable film 2 is, the shorter the pressure balance time is, and the smaller the formed pressure difference is, so that only a small amount of water vapor can enter the shell 1 through the first PTFE waterproof breathable film 2 and is absorbed by the reversible drying agent 6, and the phenomenon that condensation is caused when the mist enters the car light is further eliminated.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a prevent drier ventilated membrane subassembly of car light fogging installs in the back of car light lamp body, the back of car light lamp body is equipped with a plurality of air vents, its characterized in that includes:
a housing which is hollow and has two open ends;
the first PTFE waterproof and breathable film is sealed at one end of the shell;
the second PTFE waterproof breathable film is sealed at the other end of the shell, the air permeability of the second PTFE waterproof breathable film is greater than that of the first PTFE waterproof breathable film, and the second PTFE waterproof breathable film covers the vent hole;
the reversible drying agent is filled in the shell;
the heater can heat the reversible drying agent, so that generated water vapor is released to the outside through the first PTFE waterproof and breathable film.
2. The desiccant vent assembly for preventing fog from being generated in automotive lights according to claim 1, wherein the first PTFE waterproof vent membrane has a protection rating of IPX7 or IPX8 and has a vent amount ranging from 100 to 5000 ml/cm/min @70 mbar.
3. The desiccant vent assembly for preventing fog from being emitted from vehicle lamps according to claim 2, wherein said first waterproof and breathable PTFE membrane has a protection rating of IP68 and a vent volume of 800-1500 ml/cm/min @70 mbar.
4. The desiccant vent assembly for preventing fog from being generated in automotive lights according to claim 2, wherein said first PTFE waterproof vent membrane has a protection rating of IP67 and a vent volume of 2000-3000 ml/cm/min @70 mbar.
5. The desiccant breathable membrane assembly for preventing fog from occurring in the automobile lamp according to any one of claims 1 to 4, wherein the first PTFE waterproof breathable membrane is an E-PTFE waterproof breathable membrane, or a waterproof breathable membrane formed by combining PTFE + polyester nonwoven fabric, PTFE + polypropylene nonwoven fabric, PTFE + PP mesh, or PTFE + polyester fabric.
6. The desiccant vent assembly for preventing fog from occurring in a vehicular lamp as claimed in claim 1, wherein said first and second PTFE waterproof vent membranes are sealed at both ends of said housing by welding, said welding being ultrasonic welding, thermal welding or high frequency welding.
7. The desiccant vent assembly for preventing fogging of a vehicular lamp according to claim 1, wherein the material of said housing is a PP polymer resin, or a PBT polymer resin, or a PA polymer resin, or a PC polymer resin, or a glass fiber reinforced polycarbonate composite.
8. The desiccant vent assembly for preventing fogging of a vehicular lamp according to claim 1, wherein the reversible desiccant is an alumina desiccant or a silica gel desiccant, and the filling amount thereof in the housing is 80% to 100%.
9. The desiccant permeable membrane assembly for preventing fog from occurring in the automotive lamp according to claim 1, wherein the second PTFE waterproof permeable membrane is a waterproof permeable membrane formed by combining PTFE and polyester non-woven fabrics, and the size of the micropores of the second PTFE waterproof permeable membrane is 2-10 μm.
10. The assembly of claim 1, wherein the heater comprises at least two electrical heating elements perpendicular to each other, the circuit board has a plurality of mounting holes, and the electrical heating elements are vertically fixed on the circuit board through the mounting holes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023248400.4U CN214064811U (en) | 2020-12-29 | 2020-12-29 | Prevent drier ventilated membrane subassembly of car light fogging |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023248400.4U CN214064811U (en) | 2020-12-29 | 2020-12-29 | Prevent drier ventilated membrane subassembly of car light fogging |
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| CN214064811U true CN214064811U (en) | 2021-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992574A (en) * | 2022-06-06 | 2022-09-02 | 江苏文光车辆附件有限公司 | Air outlet structure for reducing fogging inside automobile lamp |
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- 2020-12-29 CN CN202023248400.4U patent/CN214064811U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992574A (en) * | 2022-06-06 | 2022-09-02 | 江苏文光车辆附件有限公司 | Air outlet structure for reducing fogging inside automobile lamp |
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