Patent ID: 9534496
Date: 2017-01-03
CPC Classifications: E21F

Claim:
1. A tunnel air ventilation system installed on a tunnel, said system comprising: two fan subsystems; wherein each of said two fan subsystems are located at two ends of said tunnel, outside said tunnel, which are called a first fan subsystem and a second fan subsystem; wherein each of said two fan subsystems comprises: a filter, a vibration damping device, and at least one fan; a main duct; wherein said first fan subsystem is connected to said main duct; wherein said main duct stretches from a first end of said tunnel to middle of said tunnel; wherein said first fan subsystem pushes air into said main duct through length of said tunnel from said first end of said tunnel toward said middle of said tunnel; multiple outlet units; wherein said multiple outlet units are located on said main duct; wherein each of said multiple outlet units has one or more air funnels for passing air into said tunnel; wherein said tunnel is divided into three main regions; wherein said three main regions comprise: a) first entrance region and second entrance region, b) first side region and second side region, and c) a middle tunnel region; wherein in said middle tunnel region, the density of number of said multiple outlet units on said main duct, per unit length of said main duct, is Dmiddle; wherein in said first side region, the density of number of said multiple outlet units on said main duct, per unit length of said main duct, is Dside; wherein in said first entrance region, the density of number of said multiple outlet units on said main duct, per unit length of said main duct, is Dentrance; wherein said Dmiddle is larger than Dside, and said Dside is larger than Dentrance; wherein direction of air flow inside said tunnel is symmetric with respect to center of said tunnel; wherein for a first part of said middle tunnel region, located in close proximity of said middle of said tunnel, said one or more air funnels are positioned perpendicular to said tunnel's length axis; and wherein for any parts of said tunnel other than said first part of said middle tunnel region, said one or more air funnels are positioned inclined with respect to said perpendicular to said tunnel's length axis, pointing toward either said first end of said tunnel or a second end of said tunnel which is closer to said one or more air funnels.