US 11,779,958 B2
Ultrasonic stepping motor device for generating ultra-fine single droplet
Jianmin Gao, Zhenjiang (CN); and Ke Xu, Zhenjiang (CN)
Assigned to JIANGSU UNIVERSITY, Zhenjiang (CN)
Appl. No. 17/638,227
Filed by JIANGSU UNIVERSITY, Zhenjiang (CN)
PCT Filed Nov. 29, 2021, PCT No. PCT/CN2021/133969
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2022/135069, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 202011550157.3 (CN), filed on Dec. 24, 2020.
Prior Publication US 2023/0158544 A1, May 25, 2023
Int. Cl. B06B 1/06 (2006.01)
CPC B06B 1/0611 (2013.01) [B06B 1/0651 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An ultrasonic stepping motor device for generating ultra-fine single droplet, comprising a valve core, a spring, a valve housing, a rubber gasket, a catheter, a rubber piston, an injector, an injector bracket, a floor, a motor bracket, shifting teeth and an ultrasonic linear motor; wherein
the valve core and the spring are installed inside the valve housing, and the valve core abuts against a liquid inlet of the valve housing under an elastic force of the spring; a first infusion hole of the valve housing is connected and communicated with the catheter through threads; a right end of the catheter is equipped with the rubber piston, and the rubber piston is arranged in a cavity of the injector and matched with the injector;
the injector is supported by the injector bracket installed on the floor; the motor bracket is installed on the floor by threaded connection; the ultrasonic linear motor is installed on the motor bracket;
the ultrasonic linear motor comprises a first piezoelectric ceramic, a second piezoelectric ceramic, a shaft sleeve, a double end stud, a partition and a nut;
the double end stud is fixed on the motor bracket, the first piezoelectric ceramic and the second piezoelectric ceramic are symmetrically mounted on the double end stud; the second piezoelectric ceramic is located near a center of the double end stud, and the first piezoelectric ceramic is placed outside the second piezoelectric ceramic; the partition is arranged between the first piezoelectric ceramic, the second piezoelectric ceramic and the shaft sleeve; the shaft sleeve is arranged on both ends of the double end stud, and the shaft sleeve is compressed by the nut;
the shifting teeth are arranged between the shaft sleeve and the nut;
the catheter is installed on an upper end of the shifting teeth;
a diameter of the cavity is calculated from a diameter of droplets produced and a size of a single feed of the catheter, and the diameter of the cavity is determined by the following formula:

OG Complex Work Unit Math
where, x is a feed length of the catheter, d1 is the diameter of the cavity, and d2 is a diameter of an outlet hole of the injector.