Blower and ventilation system

Abstract

Provided is a blower installed at a manhole opening, with which it is possible to facilitate an entry or an exit of a worker or an import or an export of an article. The present invention provides a ventilation system comprising a frame and a single or a plurality of airflow generation means arranged at the frame, a direction of an airflow is adjusted so that the airflow generated from the airflow generation means flows along with a virtual axis penetrating a virtual surface which the frame is regarded as to periphery, and the airflow flows while swallowing up the surrounding air of the virtual axis, and an air volume more than two times of total fluid volume of the airflow is generated.

1 . A blower comprising:
 a frame;   a single or a plurality of airflow generation fans arranged at said frame; and   an installation tool configured to install said airflow generation fan or fans on said frame, wherein   a direction of an airflow is adjusted so that said airflow generated from said airflow generation fan or fans flows along with a virtual axis penetrating a virtual surface which said frame is regarded as periphery, said airflow flows while swallowing up the surrounding air of said virtual axis, and an air volume more than two times of total fluid volume of said airflow is generated, and   said installation tool is configured to adjust an angle of said airflow generation fan or fans against said virtual surface such that an incident angle of said airflow against said virtual surface becomes 16 to 24 degrees.   
     
     
         2 . A blower according to  claim 1 , wherein
 said virtual axis vertically intersects said virtual surface at a center point of the same.   
     
     
         3 . A blower according to  claim 1 , wherein
 said plurality of airflow generation fans are arranged at said frame, and   a direction of each airflow is adjusted so that each airflow generated by said plurality of airflow generation fans flows toward one point on said virtual axis.   
     
     
         4 . A blower according to  claim 3 , wherein
 said plurality of airflow generation fans are arranged at a symmetric position having a center which is an intersection point of said virtual surface and said virtual axis.   
     
     
         5 . A blower according to  claim 1 , wherein
 said airflow generation fan or fans comprise a generation source and an injection nozzle having a conical part for converging the airflow sent from said generation source, and a cylindrical part positioned at a top end of said conical part.   
     
     
         6 . A blower according to  claim 5 , wherein
 said injection nozzle is configured to adjust a direction of said airflow.   
     
     
         7 . A blower according to  claim 1 , further comprising
 a blockage member for blocking a gap between a circumferential area of a manhole opening and said frame.   
     
     
         8 . A blower according to  claim 1 , further comprising
 an airflow reflection plate which is installed through a manhole opening, the airflow reflection plate being positioned in a lower part in a manhole to convert a direction of airflow from a vertical direction to a horizontal direction.   
     
     
         9 . A ventilation system using the blower according to  claim 1 , wherein
 said blower is installed in an entrance or an exit of a pipe conduit, a pipe line or a path, or at least one of an entrance and an exit of a manhole connected to the pipe conduit or the pipe line, or the manhole.   
     
     
         10 . A ventilation system according to  claim 9 , further comprising
 an airflow direction conversion plate for converting a direction of the airflow from a vertical direction to a horizontal direction, or from the horizontal direction to the vertical direction, at an entrance or an exit to which said blower is installed, or at a bottom of the manhole.   
     
     
         11 . A ventilation system according to  claim 9 , further comprising
 an airflow direction conversion fan for generating a second airflow different from the airflow from said blower, and said second airflow is joined in a different direction from the airflow from said blower and the direction of said airflow is converted.   
     
     
         12 . A ventilation system according to  claim 9 , wherein
 an exhaust fan is installed on at least one of an entrance, an exit and a manhole which is different from the entrance, the exit or the manhole on which said blower is installed.   
     
     
         13 . A ventilation system according to  claim 12 , wherein
 said exhaust fan is installed on a first entrance, exit or manhole which is located downstream relative to the entrance, the exit or the manhole on which said blower is installed.   
     
     
         14 . The ventilation system according to  claim 12 , further comprising
 an airflow direction conversion plate for converting a direction of the airflow from a vertical direction to a horizontal direction, or from the horizontal direction to the vertical direction, at the entrance, the exit or a bottom of the manhole to which said exhaust fan is installed.