AIR-ASSISTED ELECTROSTATIC ULTRASONIC ATOMIZATION NOZZLE AND METHOD

Abstract

An air-assisted electrostatic ultrasonic atomization nozzle includes an intake sleeve, a Laval tube, a resonant body and a jet element body. The left end of the intake sleeve is equipped with the air intake, and the right end of the air inlet sleeve is connected with the left end of the Laval tube. The right end of the Laval tube is connected with the left end of the resonant body. The right end of the resonant body is connected with the left end of the jet element body. The sealing surface of the resonant tube is arranged between the resonant body and the jet element body. The sealing surface of the resonant tube obstructs the gas-liquid in the axial direction of the resonant body and the jet element body. The resonant body has a resonant chamber, and the sidewall of the resonant body is equipped with a V-shaped resonant tube.

Claims

1. An air-assisted electrostatic ultrasonic atomization nozzle, comprising an intake sleeve, a Laval tube, a resonant body and a jet element body; wherein a left end of the intake sleeve is equipped with an air intake, and a right end of the intake sleeve is connected with a left end of the Laval tube; a right end of the Laval tube is connected with a left end of the resonant body, and a right end of the resonant body is connected with a left end of the jet element body; a sealing surface of the resonant tube is arranged between the resonant body and the jet element body and allows gas in the resonant body to enter the jet element body through a gas diversion hole of a V-shaped resonant tube; the resonant body has a resonant chamber, and a sidewall of the resonant body is equipped with the V-shaped resonant tube; the V-shaped resonant tube is connected with a gas diversion hole of the jet element body; the jet element body is also equipped with a liquid inlet and a diversion chamber, liquid enters the diversion chamber through the liquid inlet, and then is blown by the gas entered by the gas diversion hole to the rotating device to be ejected through an air-mist outlet.

2. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 1, wherein the rotating device comprises a piezoelectric sphere and a vortex blade; wherein the piezoelectric sphere is ellipsoidal, and an outer contour is covered with piezoelectric material; several vortex blades are provided on the piezoelectric sphere.

3. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 1, wherein the rotary device is arranged in a piezoelectric sphere moving chamber, and the rotary device is supported by a supporting rod; the piezoelectric sphere moving chamber is arranged in the jet element body.

4. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 2, wherein the rotary device is arranged in a piezoelectric sphere moving chamber, and the rotary device is supported by a supporting rod; the piezoelectric sphere moving chamber is arranged in the jet element body.

5. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 3, wherein a middle section of the piezoelectric sphere moving chamber is a contraction and expanding tube, and a left end of the middle section of the piezoelectric sphere is expanded gradually; a right end of the middle section of the piezoelectric sphere moving chamber is gradually tapered and contracted.

6. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 4, wherein the outer contour of the piezoelectric sphere and an inner contour of the piezoelectric sphere moving chamber are based on parameters of the Laval tube.

7. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 1, wherein a structure of the resonant chamber is step type, a left end diameter and a middle section diameter of the resonant chamber are 9 to 11 mm and 5 to 7 mm, respectively; a right expansion end diameter is 8 to 10 mm.

8. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 1, wherein the liquid inlet is arranged up and down relative to the gas diversion hole.

9. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 1, wherein a gap is formed between an outlet of the diversion chamber and the sealing surface of the resonant tube, the gap is 1 to 2 mm, and a height difference of upper and lower wall surfaces of the diversion chamber is 2 to 3 mm.

10. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 2, wherein a twist angle of the vortex blade is set to 45°.

11. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 2, wherein after a certain pressure of gas enters into the Laval tube through the air intake, it is rapidly accelerated from subsonic to supersonic, and the supersonic flow is formed at the exit of the Laval tube, then supersonic air flows into a stepped resonant chamber, and at the same time a shock wave is generated at the entrance of the resonant chamber, as the pressure in the resonance chamber increases, the shock wave gradually moves away from the entrance, therefore, the ultrasonic vibration of the high-speed gas flow in the stepped resonant chamber causes the ultrasonic vibration of the sealing surface on the right side of the resonant tube, at the same time, the droplets flow from the outlet of the diversion cavity through the liquid inlet to the outer end of the sealing surface of the resonance tube, which causes the droplet to produce ultrasonic vibration and break, as the static pressure of the sidewall orifice of the resonant body gradually decreases, the gas flows out of the V-shaped resonant tube, and the gas flows through the gas diversion hole to reach the second atomization after converging with the liquid drops at the left side face of the jet element, subsequently, the high-speed gas-liquid mixture hits the vortex blade, causing the gas-liquid mixture to swirl into the vortex at a high speed, at the same time, the piezoelectric sphere is driven to rotate rapidly and accelerate the fluid in a short time, at this time, the fluid exerts a certain pressure on the surface of the piezoelectric sphere so that the piezoelectric material produces a positive piezoelectric effect on the surface of the piezoelectric sphere, both the inner and outer surfaces of the piezoelectric material have positive and negative charges, and the droplets are positively charged through the surface of the piezoelectric sphere, the high-speed gas-liquid mixture is accelerated to supersonic speed through the Laval tube formed by the outer wall of the piezoelectric sphere and the inner wall of the piezoelectric sphere moving chamber, therefore, the mist droplets are further atomized in this process, and finally, the electrostatistically charged supersonic mist droplets are ejected from the air-mist outlet.

12. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 4, wherein a middle section of the piezoelectric sphere moving chamber is a contraction and expanding tube, and a left end of the middle section of the piezoelectric sphere is expanded gradually; a right end of the middle section of the piezoelectric sphere moving chamber is gradually tapered and contracted.

13. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 11, wherein the rotary device is arranged in a piezoelectric sphere moving chamber, and the rotary device is supported by a supporting rod; the piezoelectric sphere moving chamber is arranged in the jet element body.

14. The air-assisted electrostatic ultrasonic atomization nozzle according to claim 11, wherein a twist angle of the vortex blade is set to 45°.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a structural diagram of the gas-assisted electrostatic ultrasonic atomization nozzle of the present invention;

[0025] FIG. 2 is a left view of the piezoelectric sphere and the vortex blade of the present invention;

[0026] FIG. 3 is a schematic diagram of the piezoelectric sphere with the inner wall of the moving chamber of the piezoelectric sphere forming a Laval tubular shape and connecting the top of the piezoelectric sphere with the center of the supporting rod.

[0027] FIG. 4 is a schematic diagram of the Laval tube flow line of the present invention.

[0028] In these figures, the elements are numbered as follows: 1—air intake, 2—intake sleeve, 3—Laval tube, 4—resonant body, 5—resonant chamber, 6—sealing surface of the resonance tube, 7—liquid inlet, 8—diversion chamber, 9—jet element body, 10—air-mist outlet, 11—supporting rod, 12—piezoelectric sphere, 13—vortex blade, 14—gas diversion hole, 15—AV-shaped resonant tube, and 16—piezoelectric sphere moving chamber.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Embodiments of the proposed device are described in detail below, and examples of the embodiment are shown in the accompanying drawings. From the beginning to the end, the same and similar label denotes the same and similar element or element having the same or similar functions. The embodiments described below in conjunction with the drawings are exemplary to explain the invention and should not be construed as limiting the present invention.

[0030] There are some positional words in the writing of the present invention, such as lower, upper, sidewall, inner wall, left end, right end, one end, and the other end of the position words, which are only for the convenience of description and understanding of the schematic diagram. However, this does not mean that the actual object needs to strictly follow the requirements for operation. In addition, there are some simple commonly used terms in the present invention, such as fixed, installed, connected and other terms that should be taken as the meaning of the general understanding. For example, the word “connected” can be understood as the connection between two parts of thread or glue. Professional and technical personnel need to understand this issue under specific circumstances.

[0031] In the present invention, unless otherwise specified and limited, the terms “installation”, “connection”, “connection”, “fixing”, etc. should be understood in a broad sense. For example, connections can be fixed, detachable, or monolithic. More importantly, it can also be a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate, or an internal connection between two components. A person of ordinary skill in this field can understand the specific meaning of the above terms in the present invention.

[0032] Embodiments of the present invention will be described in combination with the accompanying drawings.

[0033] As shown in FIG. 1, the air-assisted electrostatic ultrasonic atomization nozzle of the present invention is composed of the following: air intake 1, intake sleeve 2. Laval tube 3, resonant body 4, resonant chamber 5, sealing surface of the resonance tube 6, liquid inlet 7, the diversion chamber 8, jet element body 9, air-mist outlet_10, supporting rod 11, piezoelectric sphere 12, vortex blade 13, gas diversion hole 14, V-shaped resonant tube 15, and piezoelectric sphere moving chamber 16.

[0034] Air inlet 1 is installed at the center of the left end of air inlet sleeve 2, the right end of intake sleeve 2 is connected to the left end of Laval tube 3, and the right end of Laval tube 3 is connected to the left end of resonant body 4. The interior of resonant body 4 is equipped with stepped resonant chamber 5 to improve the resonance effect of the air flow in the resonant chamber. The sidewall of resonant body 4 is equipped with V-shaped resonant tube 15, and the right end of resonant body 4 is the sealing surface of resonant tube 6. Moreover, the right end of resonant body 4 is connected with the left end of jet element body 9. The purpose is to prevent the gas in resonant body 4 from directly entering jet element body 9, and the airflow enters through gas diversion hole 14 in jet element body 9, thus blowing the liquid in jet element body 9 to the rotating device. The jet element body 9 material of the present invention is polytetrafluoroethylene (PTFE), which has the advantages of corrosion resistance, high temperature resistance, good wear resistance, and good electrical insulation performance. The torsion angle of the vortex blade is set to 45° so that the high-speed gas-liquid mixing effect is better.

[0035] The upper sidewall of jet element body 9 is equipped with liquid inlet 7, liquid inlet 7 is connected with diversion chamber 8, and diversion chamber 8 is located on the upper wall of jet element body 9. There is a distance of 1 to 2 mm between the liquid outlet of diversion chamber 8 and the sealing surface of resonant tube 6. To ensure that the outflowing droplets can be fully ultrasonically vibrated on the sealing surface of resonant tube 6 and broken into fine droplets. Gas diversion hole 14 on the lower left side of jet element body 9 is connected with a V-shaped resonant tube 15, wherein the center part of jet element body 9 is equipped with piezoelectric sphere moving chamber 16, and six vortex blades 13 are arranged on the surface of piezoelectric sphere 12. The right end of piezoelectric sphere 12 is equipped with a tip contact. Both ends of supporting rod 11 are fixedly installed at the maximum diameter of the expansion end of the inner wall of piezoelectric sphere moving chamber 16, the center of supporting rod 11 is connected with the tip contact, and the center of the right end of jet element body 9 is equipped with air-mist outlet 10.

[0036] As shown in FIG. 2, the shape of piezoelectric sphere 12 is ellipsoid. The two ends of piezoelectric sphere 12 have different sizes. Vortex blade 13 is installed at the large end of piezoelectric sphere 12, and vortex blade 13 is designed to ensure the introduction of a gas-liquid mixture into it by rotation of the blade. At the same time, under the action of a high-speed gas-liquid mixture, vortex blade 13 can be driven to rotate piezoelectric sphere 12 and form a short acceleration time to the fluid.

[0037] As shown in FIG. 3, piezoelectric sphere 12 forms a Laval tube shape with the inner wall of piezoelectric sphere moving chamber 16. The tip of piezoelectric sphere 12 connects with the center of supporting rod 11. The piezoelectric sphere moving chamber 16 is in the shape of an inner wall contraction and expansion tube. The outer contour of the piezoelectric sphere 12 and the inner contour of the piezoelectric sphere moving chamber 16 were designed according to the parameters of Laval tube 3. However, the upper and lower tubes formed by piezoelectric sphere 12 and the inner wall of the middle segment of piezoelectric sphere moving chamber 16. To facilitate the Laval effect of the gas-liquid mixture through the formed channel, the gas-liquid mixture is further accelerated to a supersonic ejection. The outer surface of piezoelectric sphere 12 is covered with a layer of piezoelectric material. When a certain pressure is applied to piezoelectric sphere 12 by the gas liquid mixture, the piezoelectric material generates a positive piezoelectric effect. The end of piezoelectric sphere 12 is provided with a tip, which is connected to the center of supporting rod 11. Supporting rod 11 is fixed at the maximum diameter of the expansion end of the inner wall of piezoelectric sphere moving chamber 16 to ensure the normal rotation of piezoelectric sphere 12.

[0038] As shown in FIG. 4, a schematic diagram of the Laval tube flow line of the present invention, the inlet diameter of Laval tube 3 is 12 to 14 mm, the throat diameter is 3 to 4 mm, and the outlet diameter is 9 to 11 mm. Under normal working conditions, the flow passes through the contraction phase at a subsonic speed. It passes through the throat of the acceleration phase at a sonic speed and into the expansion phase at a supersonic speed until the exit. The formula is as follows:

[00001]$\frac{\mathrm{dA}}{A}=\frac{u}{a^2}\mathrm{du}-\frac{\mathrm{du}}{u}=\frac{u^2}{a^2}\frac{\mathrm{du}}{u}-\frac{\mathrm{du}}{u}=\left(M^2-1\right)\frac{\mathrm{du}}{u}$

[0039] where “M” is the Mach number of the airflow. It can be seen from the formula that in the subsonic flow phase, when “M<1”, if “du>0”, then “dA<0”; and if “du<0”, then “dA>0”. The above results show that when the subsonic flow accelerates along the streamline of Laval tube 3, the cross-sectional area of the flow must decrease gradually. When air flows at supersonic speeds, the moment when “M>1”, if “du>0”, then “dA>0”; and if “du<0”, then “dA<0”. The above results show that when the supersonic flow accelerates along the streamline of Laval tube 3, the cross-sectional area of the fluid increases slowly, and the supersonic flow is inversely proportional to the subsonic flow. In conclusion, the effect is best when the Mach number “M=1” at the throat of Laval tube 3.

[0040] According to the embodiment of the present invention, the working process of an air-assisted electrostatic ultrasonic atomization nozzle is as follows.

[0041] After a certain pressure of gas enters Laval tube 3 through air inlet 1, it rapidly accelerates from subsonic to supersonic and forms a supersonic flow at the exit of Laval tube 3. Then, supersonic air flows into stepped resonant chamber 5, and a shock wave is generated at the entrance of resonant chamber 5. As the pressure in the cavity increases, the shock wave gradually moves away from the entrance. Therefore, the ultrasonic vibration of the high-speed gas flow in stepped resonant chamber 5 leads to the ultrasonic vibration of the right side of the sealing surface of resonant tube 6. At the same time, the liquid droplet flows from outlet diversion chamber 8 through liquid inlet 7. The outer end of the sealing surface of resonance tube 6 causes the droplet to generate ultrasonic vibration and break. As the static pressure of the sidewall orifice of resonant body 4 decreases gradually, the gas flows out of the V-shaped resonator 15 through gas diversion hole 14 to reach secondary atomization after converging with the liquid drops at the left side face of jet element 9. Then, the high-speed gas-liquid mixture hits vortex blade 13 so that the gas-liquid mixture spirals into the vortex at a high speed. At the same time, piezoelectric sphere 12 is driven to rotate rapidly, and the fluid is accelerated in a short time. At this time, the fluid exerts a certain pressure on the surface of piezoelectric sphere 12, which makes the piezoelectric material produce a positive piezoelectric effect on the surface of piezoelectric sphere 12. Both the inner and outer surfaces of the piezoelectric material have positive and negative charges, and the droplets are positively charged through the surface of the piezoelectric sphere 12. The high-speed gas-liquid mixture is accelerated to supersonic speed through the Laval tube formed by the outer wall of piezoelectric sphere 12 and the inner wall of the moving chamber of piezoelectric sphere 12. Therefore, the mist droplets are further atomized in this process, and finally, the supersonic mist droplets with charged electrostatic electricity are ejected from the air-mist outlet.

[0042] In the description of this specification, descriptions referring to the terms “one embodiment”, “some embodiments”, “examples”, “concrete examples”, or “some examples” refer to the specific features, structures, materials, or characteristics described in combination with the embodiments or examples that are included in at least one embodiment or example of the invention. The indicated representations of the above terms in this specification do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments and examples in a suitable manner.

[0043] The abovementioned embodiment is the preferred embodiment of the proposed device present invention, but the present invention is not limited to the above embodiment. Any obvious improvement, substitution or modification that a person skilled in the art can make without departing from the gist of the present invention is applicable. It belongs to the embodiment of the present invention and the protection scope of the present invention.