A nasal filter includes a main body, a cover, and a filtering medium. The main body has a hollow cylinder, a boss connected to a spherical member, a flange, and a plurality of internal guide vanes. The hollow cylinder has a front and a rear opening. A first threaded portion is formed on the outer surface at the front end portion of the hollow cylinder. A thru hole is formed on the cover and aligns correspondingly to the front opening of the hollow cylinder. A second threaded portion is formed on the inner surface of the cover for mating to the first threaded portion on the hollow cylinder. The filtering medium is held in between the cover and the hollow cylinder and covers the thru hole. A filter pad is further included to provide additional functions. Accordingly, the nasal filter offers air purification and doe not cover the mouth.
1. A nasal filter, comprising:
a main body having a hollow cylinder, the hollow cylinder having a front opening and a rear opening, a boss connected to a rear end portion of the hollow cylinder, a spherical member connected to a top end of the boss for insertion into a nostril of a user, a flange formed on an outer surface of the hollow cylinder, a plurality of guide vanes arranged in intervals on an inner wall of the hollow cylinder, and a first threaded portion formed on the outer surface at a front end portion of the hollow cylinder;
a cover having a thru hole aligned with the front opening of the hollow cylinder and a second threaded portion formed on an inner wall of the cover for mating to the first threaded portion of the main body; and
a filtering medium disposed in between the cover and the main body that covers the thru hole.
2. The nasal filter of claim 1 , wherein the hollow cylinder has an internal ring portion and the guide vanes are connected in between the ring portion of the inner wall of the hollow cylinder.
3. The nasal filter of claim 2 , wherein a receiving space is formed by the inner wall of the hollow cylinder and the ring portion, the receiving space is located in front of the guide vanes for holding a filter pad.
4. The nasal filter of claim 1 , wherein the flange slopes away from the boss.
5. The nasal filter of claim 1 , wherein a grid is formed on the cover at the thru hole.