Low-frequency ultrasonic triple atomization nozzle

The invention discloses a low-frequency ultrasonic triple atomization nozzle which comprises an ultrasonic transducer, an amplitude transformer, a flange, a liquid inlet hole, a liquid outlet hole, an eccentric ball, a pressing block, a limit spring and support frame, wherein the upper end surface of the ultrasonic transducer is bonded together with the lower end surface of the amplitude transformer; the conical upper end surface of the amplitude transformer is connected with the flange into a whole; the upper end surface of the flange is welded together with the support frame; the plane on which the support frame is located passes through the axis of the low-frequency ultrasonic triple atomization nozzle; one end of the limit spring is welded at the upper part on the inner side of the support frame; the other end of the limit spring is welded together with the pressing block; the pressing block, the length direction of the limit spring and the axis of the low-frequency ultrasonic triple atomization nozzle are collinear; and the eccentric ball is pressed in a nozzle groove by the pressing block. The low-frequency ultrasonic triple atomization nozzle performs tertiary atomization of a nutrient solution on the basis of secondary atomization, breaks through the bottleneck that a low-frequency ultrasonic atomization nozzle can hardly generate superfine droplets and enables the low-frequency ultrasonic atomization nozzle to achieve a better development prospect in the field of aeroponic culture.