Ventilation check valve for bathrooms and toilets

Abstract

A check valve for bathrooms and toilets to improve air ventilation and prevent insects and viruses from entering the bathrooms and toilets includes an elbow duct which has an inlet end on one side communicating with a ventilation vent, and a cylinder extended outwards from the inlet end to couple with a padding on the inner rim. There is an outlet end on other end of the elbow duct positioned in a diagonal and upper manner relative to the cylinder. The elbow duct has an inclined side on the bottom. The inclined side has an upper end bent to form a conical cavity. The elbow duct houses a ball which may roll automatically on the inclined side to close the ventilation vent. When air is dispelled through the ventilation vent, airflow pushes the ball to the conical cavity to form a passage in the elbow duct.

1 . A ventilation check valve for bathrooms and toilets located on one side of a ventilation vent, comprising an elbow duct which has an inlet end on one side and an outlet end on other side, the inlet end being extended outwards to form a cylinder, the outlet end being located in a diagonal and upper manner relative to the cylinder, the elbow duct further having a sloped side on the bottom that has one end bent to form a conical cavity and a passage in the interior, the passage holding a ball which rolls automatically to close the inlet end to prevent outdoor foul air and filthy gases from entering a toilet.  
   
   
       2 . The ventilation check valve of  claim 1 , wherein the inlet end communicates with the ventilation vent of the toilet.  
   
   
       3 . The ventilation check valve of  claim 1 , wherein the cylinder has an inner rim to couple with a padding.  
   
   
       4 . The ventilation check valve of  claim 1 , wherein the sloped side has an inclined angle ranging from 5 degree to 10 degree.  
   
   
       5 . The ventilation check valve of  claim 1 , wherein the conical cavity has two ends that are formed respectively an arched portion and a zigzag edge.  
   
   
       6 . The ventilation check valve of  claim 1 , wherein the outlet end is coupled with a filter.  
   
   
       7 . The ventilation check valve of  claim 1 , wherein the check valve includes a large duct which houses a small duct, the large duct having an opening on one end and an outlet end on other end, the small duct having an inlet end on one end that has a flange, slots on the periphery that are opposing and corresponding to each other, and a closed surface on other end thereof, the closed surface having an aperture at a diameter smaller than the inner diameter of the smaller duct, the small duct further housing a ball.  
   
   
       8 . The ventilation check valve of  claim 7 , wherein the large duct has a cavity running through the interior thereof.  
   
   
       9 . The ventilation check valve of  claim 7 , wherein the small duct is positioned at an inclined angle.  
   
   
       10 . The ventilation check valve of  claim 9 , wherein the inclined angle ranges from 5 degree to 10 degree.