초록 ▼

An airflow booster fan and control device therefor, the booster fan, preferably of the centrifugal, axial flow type, adapted for in-line installation into a length of duct or at the remotely located end of the duct in an air transfer duct system. The duct system may be one which removes heated and m

An airflow booster fan and control device therefor, the booster fan, preferably of the centrifugal, axial flow type, adapted for in-line installation into a length of duct or at the remotely located end of the duct in an air transfer duct system. The duct system may be one which removes heated and moistened air from a clothes dryer and particularly where the duct system is remotely located from the dryer. The control device delivers electrical power to the booster fan when an air pressure signal from within the duct system in close proximity to, or within, the booster fan is sufficient, as indicative of e.g. clothes dryer operation, to activate the control device to do so. However, a time delay relay in the control device maintains the booster fan in operation after each activating pressure signal for a predetermined length of time, after which the booster fan will be shut off. If there is still air pressure buildup in the duct system, the booster fan will be reactivated for another time to shut off delay period. The control device may be mounted directly to the booster fan housing or to adjacent or remote building support structure, the only requirement therebetween being the interconnection of electric power transfer cable between an electric power outlet and the control device and between the control device and the booster fan, as well as an air pressure transfer conduit from the booster fan or adjacent duct and the control device.

대표청구항 ▼

[ What is claimed is:] [2.] A control device for an air duct booster fan which operates to increase airflow through a length of duct into which an inlet and an outlet of the booster fan is operably connected, said control device comprising:electrical connection means positioned electrically between

[ What is claimed is:] [2.] A control device for an air duct booster fan which operates to increase airflow through a length of duct into which an inlet and an outlet of the booster fan is operably connected, said control device comprising:electrical connection means positioned electrically between the booster fan and an electric power supply and also having a pressure relay pneumatically connected for receiving a pressure signal from an inlet of the booster fan whereby an initial electrical connection is made between the electric power supply and the booster fan when there is sufficient air pressure in the inlet;time delay means operably connected to said electrical connection means for maintaining the electrical connection between the electric power supply and the booster fan for a predetermined length of time after each initial electrical connection is made.