Ventilation valve

Abstract

A ventilation valve, comprising a cylindrical valve body ( 1 ), a gear box ( 2 ), a plurality of fan-shaped vanes ( 3 ) and a drive device ( 4 ), the gear box ( 2 ) being arranged in the center of the valve body ( 1 ), and a geared mechanism being provided inside the gear box ( 2 ). The drive device ( 4 ), by means of a geared drive mechanism, cause the vanes ( 3 ) to rotate in a same direction, each around its own central shaft; the vanes ( 3 ) are arranged within the valve body ( 1 ) in a uniform distribution; the geared mechanism comprises a first central gear ( 23 ) and a second central gear ( 24 ) fitted on a same supporting shaft ( 25 ); between the first central gear ( 23 ) and the second central gear ( 24 ) are provided a plurality of gears, one each of which is arranged at the end of one of said central shafts which extends to within the gear box ( 2 ), each of said gears engaging with both said first central gear ( 23 ) and said second central gear ( 24 ). Also arranged within the valve body ( 1 ) is one or a plurality of airflow meters ( 6 ), the distance between the central axis of each of said one or plurality of airflow meters ( 6 ) and the central axis of the valve body ( 1 ) is different. The present ventilation valve precisely controls airflow and is safe and reliable, while featuring improved geared mechanism security and reduced wear and tear, thus prolongs the service life of the ventilation valve.

1 . A ventilation valve, comprising a cylindrical valve body, a gear box, a plurality of fan-shaped vanes and a drive device, a sealing device on an inner surface of said valve body, the gear box disposed in said valve body, and a geared mechanism inside said gear box; said drive device drives said geared mechanism to rotate the vanes around an axis; the vanes are uniformly arranged in said valve body, and one end of said vanes is adjacent the outer wall of said gear box; wherein said geared mechanism includes a first central gear and a second central gear on a support shaft, a plurality of gears between said first central gear and said second central gear and fitted at one end of each central shaft extending into said gear box, each of the plurality of gears are simultaneously engaged with said first central gear and said second central gear;
 one or a plurality of airflow meters within said valve body, and when a plurality of airflow meters are in said valve body, the distances of the axis of said plurality of airflow meters to the axis of said valve body are different to facilitate measurement of air volumes flowing through the ventilation valve at different rotation radii.   
     
     
         2 . The ventilation valve according to  claim 1 , wherein said ventilation valve is arranged with a control device. 
     
     
         3 . The ventilation valve according to  claim 1 , wherein said first central gear and said second central gear are respectively connected with said support shaft through a first bearing and a second bearing. 
     
     
         4 . The ventilation valve according to  claim 3 , wherein a support tube fitted on the support shaft is arranged between said first bearing and said second bearing, and the two ends of said support tube are respectively abutted with said first bearing and said second bearing. 
     
     
         5 . The ventilation valve according to  claim 1 , wherein one of the plurality of vanes is an active vane, said drive device is connected with the central shaft of said active vane. 
     
     
         6 . The ventilation valve according to  claim 1 , wherein said gears are bevel gears. 
     
     
         7 . The ventilation valve according to  claim 3 , wherein said first central gear and said second central gear both have disc structures, and one side of said first central gear and said second central gear that meshes with said bevel gears is provided with teeth that mesh with said bevel gears. 
     
     
         8 . The ventilation valve according to  claim 1 , wherein one or more reinforcing ribs are provided at the bottom of said valve body. 
     
     
         9 . The ventilation valve according to  claim 8 , wherein the center of one or more reinforcing ribs is provided with a fixing portion for fixing said gear box. 
     
     
         10 . The ventilation valve according to  claim 9 , wherein a first positioning portion is arranged on said fixing portion, and a second positioning portion corresponding to said positioning portion is arranged at a corresponding position on an upper box body or a lower box body of said gear box.