Rear cover of vehicle lamp having valve structure and infrared radiation drying and air discharging function

1. A rear cover of a vehicle lamp having a valve structure and infrared radiation drying and air discharging function, comprising:

an end cover provided with a plurality of air vents;

a connecting base for connecting with a vehicle lamp housing;

a membrane module for infrared radiation drying and air discharging, wherein the end cover and the connecting base are assembled and connected to form the rear cover of the vehicle lamp, the membrane module is built in a cavity of the rear cover of the vehicle lamp; and

at least one valve provided on a path of air circulation inside and outside the vehicle lamp housing through the rear cover of the vehicle lamp, and the at least one valve automatically opens and closes under impulse of air pressure difference.

2. The rear cover according to claim 1 , wherein the valve is only provided on the end cover, or the valve is provided on both the end cover and the connecting base.

3. The rear cover according to claim 2 , wherein a microporous membrane is provided on a periphery of the valve for protecting the valve in a clean state.

4. The rear cover according to claim 1 , wherein the valve is fixed in a partial fixation manner or in a full fixation manner around the periphery of the valve, when the partial fixation is adopted, an unfixed portion automatically opens and closes under effect of air pressure difference, and when full fixation around the periphery is adopted, an opening in the form of a flap formed on the valve automatically opens and closes the valve under effect of air pressure difference.

5. The rear cover according to claim 1 , wherein the valve is a silicone sheet or a plastic film.

6. The rear cover according to claim 1 , wherein the membrane module for infrared radiation drying and air discharging comprises a cylindrical body and microporous membranes, wherein end faces on both sides of the cylindrical body are connected with the microporous membranes, an interior of the cylindrical body is in the form of straight through bores separated by honeycomb hollows, and the interior is filled with a mixture of a reversible moisture-absorbing micro-grain substance and substance micro-powder particles that efficiently absorb far-infrared radiation energy.

7. The rear cover according to claim 6 , wherein the microporous membranes are membranes having two-way convection capability and water vapor permeable channels.

8. The rear cover according to claim 7 , wherein when the end faces on both sides of the cylindrical body are connected with the membranes having two-way convection capability and water vapor permeable channels, moisture in the vehicle lamp housing enters the interior of the cylindrical body through the water vapor permeable channels, passes through the mixture of the reversible moisture-absorbing micro-grain substance and the substance micro-powder particles that efficiently absorb far-infrared radiation energy, and is discharged from the water vapor permeable channels, and

air from outside is dried and filtered through the membrane module and then enters an interior of the vehicle lamp housing, the air entering the vehicle lamp housing is dry air, at least one valve is provided on the path of air circulation inside and outside the vehicle lamp housing.

9. The rear cover according to claim 6 , wherein the reversible moisture-absorbing micro-grain substance is one or more of a reversible desiccant, bentonite, silica aerogel, carbon molecular sieve, carbon aerogel adsorbent and water-absorbing resin; and the substance micro-powder particles that efficiently absorb far-infrared radiation energy comprise one or more of a carbon element product, biochar, tourmaline, far-infrared ceramics, zirconium carbide, metallic oxide, and silicon carbide.