Ultrasonic filtration device for extractor hood
View Patent ↗An ultrasonic filtration device may be incorporated into or otherwise installed in an extractor hood in a cooking environment. The ultrasonic filtration device aids in the elimination and/or reduction of contaminants in the air produced as a byproduct of cooking. Particulate contaminants are bombarded with high-energy pressure waves, thereby breaking up the particulates and reducing their size until they are no longer noticeable and/or hazardous to the user.
1. A ventilation hood comprising:
a canopy having an open mouth disposed above a cooking surface and an exit duct;
a fan operatively connected to the canopy and configured to produce an airstream flowing through the open mouth to the exit duct;
an array of ultrasonic transducers disposed adjacent the airstream and configured to direct ultrasonic pressure waves into the airstream, and
a reflective surface disposed opposite the array of ultrasonic inducers.
2. The ventilation hood of claim 1 , wherein the array of ultrasonic transducers comprises a first array disposed on a first interior surface of the canopy.
3. The ventilation hood of claim 2 , wherein the array of ultrasonic transducers further comprises a second array disposed on a second interior surface of the canopy.
4. The ventilation hood of claim 3 , wherein the first interior surface is opposite the second interior surface.
5. The ventilation hood of claim 1 , wherein each transducer of the array of ultrasonic transducers is configured to emit sound waves at a frequency greater than 20 kiloHertz (kHz).
6. The ventilation hood of claim 1 , wherein each transducer of the array of ultrasonic transducers is configured to emit sound waves at an intensity of at least 100 decibels (dB).
7. A filtration system comprising:
a fan disposed in a duct having an outlet, wherein the duct is coupled to a ventilation hood having an inlet, such that the fan is configured to produce an airstream flowing from the inlet to the outlet;
an array of ultrasonic transducers disposed adjacent the airstream and configured to direct ultrasonic pressure waves into the airstream;
a mechanical baffle filter disposed in the airstream and configured to remove particulates from the airstream, and
a reflective surface disposed opposite the array of ultrasonic transducers.
8. The system of claim 7 , wherein the array of ultrasonic transducers comprises a first array disposed on a first interior surface of the ventilation hood.
9. The system of claim 8 , wherein the array of ultrasonic transducers further comprises a second array disposed on a second interior surface of the ventilation hood.
10. The system of claim 8 , wherein each transducer of the array of ultrasonic transducers is configured to emit sound waves at an intensity of at least 100 decibels (dB).