Kitchen Ventilation System With Fan Having Positive Pressure-To-Output Characteristic Applied Thereto

Abstract

The present invention relates to a kitchen ventilation system to which a fan having a positive pressure-to-output characteristic is applied. More particularly, the present invention relates to a system for maximizing efficiency of exhausting polluted air at minimum costs by applying a fan having a positive pressure-to-output characteristic to a hood, to improve a ventilation system which is installed vertically in an apartment house to discharge polluted air from kitchen hoods on respective floors to the top of an exhaust duct. The kitchen ventilation system of the present invention comprises an exhaust duct 100 provided at one side of an apartment house, and a hood 200 which is provided in the kitchen on each floor and includes a fan 210 having a positive pressure-to-output characteristic to collect surrounding air and discharge the collected air to the exhaust duct 100 . According to the present invention, noise can be reduced and economical efficiency and ventilation performance can also be improved by maximizing efficiency of exhausting polluted air at minimum costs.

1 . A kitchen ventilation system, comprising: 
 an exhaust duct vertically provided at one side of an apartment house; and    a hood for collecting surrounding air and discharging the collected air to the exhaust duct, said hood being provided in a kitchen on each floor of the apartment house and including a fan having a positive pressure-to-output characteristic.    
   
   
       2 . The kitchen ventilation system as claimed in  claim 1 , wherein the fan, which is provided in the hood and has a positive pressure-to-output characteristic, is driven by a fan driving circuit which includes a 3-phase induction motor for driving the fan, a power unit for applying electric power to the 3-phase induction motor, a capacitor C 2  connected with the 3-phase induction motor for producing a phase difference between two phases, and an impedance unit connected in series with the 3-phase induction motor for producing a constant amount of air discharged even though load applied to the fan is changed.  
   
   
       3 . The kitchen ventilation system as claimed in  claim 2 , wherein the impedance unit includes a capacitor C 1 , and a resistor R 1  connected in parallel with the capacitor C 1 .  
   
   
       4 . The kitchen ventilation system as claimed in  claim 2 , wherein the fan driving circuit further comprises a resistor R 2  connected in series with the impedance unit and a switch installed in parallel with the resistor R 2 , thereby interrupting a current flowing along the resistor R 2 .