Aroma diffuser

An aroma diffuser, comprising:

• a shell, comprising:
• an upper cover;
• and
• a bottom cover connected to the upper cover, and defining a first mist outlet for spraying out essential oil mist;
• a liquid storage bottle containing essential oil therein, mounted in the upper cover with a bottle mouth thereof facing downward, for supplying the essential oil by gravity;
• a control circuit board installed in the bottom cover;
• an atomizer assembly installed in the bottom cover, comprising:
• a first functional sheet, which is a circular metal sheet, defining a liquid through hole with a diameter of 2 mm or less;
• a second functional sheet, which is a circular metal sheet with a protrusion forming a liquid storage chamber;
• wherein the second functional sheet is electrically connected to the control circuit board via a negative wire, and has one side attached to the first functional sheet;
• the liquid through hole of the first functional sheet serves as a liquid inlet, is located in and communicates with the liquid storage chamber, and is used to inject essential oil into the liquid storage chamber;
• and the protrusion defines atomization micropores in communication with the liquid storage chamber;
• a first transducer, which is a piezoelectric ceramic transducer ring with a first through hole therein;
• wherein the first transducer is electrically connected to the control circuit board via a positive wire and is attached to the other side of the second functional sheet;
• the first transducer and the second functional sheet are combined to generate ultrasonic vibration to perform atomization;
• the protrusion of the second functional sheet is fitted in the first through hole of the first transducer;
• and
• a rubber ring, fixing and sealing peripheries of the first functional sheet, the second functional sheet and the first transducer;
• wherein the first functional sheet, the second functional sheet and the first transducer are resonantable at the same frequency;
• an atomizing cavity for accommodating the atomizer assembly;
• wherein a front pressure plate and a rear pressure plate are snapped together to form the atomizing cavity therebetween;
• the first functional sheet, the second functional sheet and the first transducer are axially stacked between the front pressure plate and the rear pressure plate, and have the peripheries thereof tightly sealed and pressed between the front pressure plate and the rear pressure plate via the rubber ring;
• the front pressure plate defines a second mist outlet communicating the atomizing cavity with the first mist outlet;
• and the protrusion of the second functional sheet passes through the first through hole of the first transducer and protrudes toward the second mist outlet;
• a connector, installed on a top open of the bottom cover, detachably connecting the bottle mouth of the liquid storage bottle, and defines a liquid channel therein which is communicated with the liquid storage bottle;
• and
• a liquid guide pipe, connecting the connector and the rear pressure plate, and in communication with the liquid channel of the connector and the atomizing cavity;
• wherein the first functional sheet, the second functional sheet and the first transducer are arranged adjacent to each other;
• the essential oil in the liquid storage bottle flows out from the bottle mouth under gravity of the essential oil, flows through the liquid channel in the connector into the liquid guide pipe, then is transported into the atomizing cavity and contacts the first functional sheet;
• when the aroma diffuser in operation, the first functional sheet, the second functional sheet and the first transducer resonate at the same frequency and generate the ultrasonic vibration, the essential oil is injected into the liquid storage chamber through the liquid through hole of the first functional sheet and is atomized into mist under the ultrasonic vibration, the mist is then discharged out from the atomization micropores, passes through the second mist outlet and then sprayed out of the shell through the first mist outlet.