| 摘要 |
The purpose of the present invention is to provide a jet fan mounted on a tunnel, and more particularly, a jet fan which includes at least two impellers but satisfies spatial constraints so as to increase air volume in order to promote smooth and rapid ventilation by increasing air volume and reduce a cross sectional area of the tunnel by providing an improved function, thereby reducing construction expenses, the number of facilities, a construction period. In order to achieve the above purpose, the jet fan having the venturi nozzle according to the present invention comprises a main body casing having a motor which is fixed and mounted by means of multiple first fixing rods to provide rotary power when electricity is applied and forming an air passage; a silencing part having an inlet external silencer and an outlet external silencer respectively connected and assembled to an inlet side and an outlet side of the main body casing and an inlet internal silencer and an outlet internal silencer respectively mounted inside the inlet external silencer and the outlet external silencer by means of second fixing rods; and multiple impellers having first and second hubs which are connected with a driving shaft of the motor to be rotated and multiple rotating wings each of which one end is assembled to a connection hole formed in a combined surface between the first and second hubs which face each other and are combined integrally with each other. The jet fan further comprises a venturi nozzle mounted in the main body casing at the downstream side of the air flow. |
