Ultrasonic stepping motor device for generating ultra-fine single droplet

Patent metadata

Field	Value
Publication number	US-11779958-B2
Application number	US-202117638227-A
Country	US
Kind code	B2
Filing date	Nov 29, 2021
Priority date	Dec 24, 2020
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

An ultrasonic stepping motor device for generating ultra-fine single droplet includes a valve housing, a valve core, and a spring. 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. The valve housing is connected with a injector through a catheter, and the catheter is driven for linear operation by the inverse piezoelectric effect of piezoelectric ceramics through an ultrasonic linear motor. A right end of the catheter is equipped with a rubber piston, and the rubber piston is arranged in a cavity of the injector and matched with the injector. Since the piezoelectric vibrator driven catheter can produce nano feed length, and the volume of droplets overflowed each time can reach micron level, which can meet the requirements of producing micro droplets.

First claim

What is claimed is:

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:

π
4

⁢

d
1
2

⁢
x

=

π
6

⁢

d
2
3

where, x is a feed length of the catheter, d 1 is the diameter of the cavity, and d 2 is a diameter of an outlet hole of the injector.

2. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 1 , wherein the first piezoelectric ceramic is a semicircular ring, with a total of eight pieces; the second piezoelectric ceramic is a circular ring, with four pieces in total; every two pieces of the first piezoelectric ceramics are spliced to in a ring shape, mounted on the double end stud, and polarization directions of upper and lower first piezoelectric ceramics in a same plane are opposite; a driving voltage phase difference is 180 degrees; upper and lower polarization directions of the second piezoelectric ceramics are the same, and a phase difference of a driving voltage is 180 degrees; a phase difference of a driving voltage between the first piezoelectric ceramic and the second piezoelectric ceramic is 90 degrees.

3. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 1 , wherein the cavity of the injector close to the outlet hole is a herringbone guide hole.

4. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 1 , wherein a length of the outlet hole of the injector is 2-4 mm and a length of the cavity is 8-10 mm.

5. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 1 , wherein a shape of the shaft sleeve is an outward expanding horn shape.

6. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 1 , wherein a retaining ring is arranged on a right side of the shifting teeth, and the catheter.

7. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 6 , wherein a diameter of the retaining ring is 4-5 mm and a width of the retaining ring is 1-2 mm.

8. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 1 , wherein the liquid inlet has a diameter of 5-6 mm and a length of 6-10 mm; the first infusion hole has a diameter of 3-4 mm and a length of 16-20 mm; and a second infusion hole has a diameter of 1-1.5 mm and a length of 75-85 mm.

9. The ultrasonic stepping motor device for generating ultra-fine single droplet according to claim 1 , wherein the catheter is clamped by the rubber gasket and the shifting teeth; the rubber gasket is provided with an end cap; the shifting teeth, the rubber gasket and the end cap are successively connected from bottom to top by bolts.

Assignees

• Univ Jiangsu

Inventors

• Gao Jianmin
• Xu Ke

Classifications

• B06B1/0611 Primary

  in a pile · CPC title

• B06B1/0651

  of circular shape · CPC title

• H02N2/001 Primary

  Driving devices, e.g. vibrators · CPC title

• H02N2/021

  using intermittent driving, e.g. step motors, piezoleg motors · CPC title

• B05B17/06

  using ultrasonic {or other kinds of} vibrations · CPC title