Multi-sound-source atomization device and method

Abstract

The invention relates to the technical field of fine atomization of large-flow liquid, in particular to a multi-sound-source atomization device and method.The multi-sound-source atomization device comprises an ultrasonic output module, a liquid supply module, an ultrasonic transducer multi-sound-source array and a multi-sound-source matching resonance atomization cavity; the ultrasonic output module is used for outputting a high-frequency signal and converting the high-frequency signal into an alternating signal with constant frequency and increased amplitude, the liquid supply module is used for stably outputting liquid drops, the ultrasonic transducer multi-sound-source array is used for converting the alternating signal into a high-frequency large-amplitude ultrasonic signal, and the multi-sound-source matching resonance atomization cavity is used for coupling and superposing the ultrasonic signal. And an enhanced sound field is output to realize superfine atomization of large-flow liquid. According to the multi-sound-source cooperative non-contact atomization device and method, aiming at the atomization scene of large-flow and viscous liquid, the particle size concentration ratio can be guaranteed, meanwhile, the problem of spray hole blockage can be effectively solved, meanwhile, by obtaining higher sound field intensity, fine atomization of the large-flow liquid is achieved, and the atomization efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fine atomization of large-flow liquid, and in particular to a multi-sound source atomization device and method. Background Art

[0002] Ultrasonic atomization technology is an efficient and important atomization technology. It is a process that disperses liquid into tiny droplets to form an atomized state through ultrasonic high-frequency vibration. It has the characteristics of high atomization precision and has broad application prospects in the fields of drug atomization delivery, pesticide spraying, environmental humidification, semiconductor film spraying, etc.

[0003] At present, the commonly used ultrasonic atomization methods mainly include ultrasonic atomization based on piezoelectric ceramic transducers and dynamic micropore atomization methods. Transducer atomization uses the inverse piezoelectric effect of piezoelectric ceramics to convert the input electrical signal into a high-frequency vibration signal, and then outputs high-frequency and high-amplitude mechanical oscillations through the amplification effect of the horn, and transfers the energy to the surface of the liquid film at the end of the transducer, so that it produces high-frequency vibrations and then breaks to produce droplets. The droplet size produced by ultrasonic atomization based on piezoelectric ceramic transducers is large, and the particle size concentration cannot be guaranteed. The dynamic micropore atomization method uses piezoelectric ceramics to drive a vibrating film with a micropore array to produce high-frequency reciprocating vibrations, and then squeezes the liquid in the liquid storage cavity to spray out from the vibrating micropore array to form uniform tiny droplets. It has excellent droplet size and concentration. However, the size of the micropores directly affects the characteristics of the droplets. Too small micropores increase the risk of nozzle blockage during the atomization process. In addition, the atomization flow rate is limited due to the size of the micropores, which restricts its application to a certain extent. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a multi-sound source atomization device and method.

[0005] The multi-sound source atomization device of the present invention comprises an ultrasonic output module, a liquid supply module, an ultrasonic transducer multi-sound source array and a multi-sound source matching resonant atomization cavity; The ultrasonic output module is used to output a high-frequency signal and convert it into an alternating signal with a constant frequency and increased amplitude; The liquid supply module is used to stably output liquid droplets; The ultrasonic transducer multi-source array is used to convert the alternating signal into a high-frequency and large-amplitude ultrasonic signal; The multi-sound source matching resonant atomization cavity is used to couple and superimpose ultrasonic signals, output an enhanced sound field, and realize ultra-fine atomization of a large flow rate of liquid.

[0006] The ultrasonic output module includes an ultrasonic generating unit and an ultrasonic driving unit. The ultrasonic generating unit is used to output a high-frequency signal. The ultrasonic driving unit is used to drive the ultrasonic transducer multi-source array to convert the high-frequency signal into an alternating voltage signal with a constant frequency and increased amplitude.

[0007] The alternating voltage signal may be a sinusoidal or square wave periodic signal.

[0008] The liquid supply module comprises a liquid pump controller, a liquid supply pump and a liquid supply microneedle, and stably outputs liquid droplets at the end of the liquid supply microneedle.

[0009] The transducer multi-sound source array includes a plurality of transducers.

[0010] The transducer may be one or more of a piezoelectric transducer and a magnetostrictive transducer.

[0011] The piezoelectric transducer is composed of a piezoelectric ceramic stack, front and rear end covers, and a horn; the entire transducer length should meet 1 / 4 wavelength or an integer multiple of 1 / 4 wavelength, thereby reducing the impedance of the connecting surface under resonance; the horn is made of a material with excellent acoustic properties, which can be aluminum, aluminum alloy or titanium alloy.

[0012] The multi-sound source matching resonance atomization cavity can be a multi-sound source rectangular atomization cavity, a multi-sound source cylindrical atomization cavity or a multi-sound source spherical atomization cavity according to experimental requirements, atomization nozzle size requirements, flow requirements or atomization scale requirements.

[0013] The multi-sound source atomization method of the present invention specifically comprises the following steps: Step 1: Build an atomization experimental platform, connect and fix the ultrasonic transducer multi-sound source array and the matching multi-sound source matching resonant atomization cavity on the experimental table, and connect the ultrasonic drive unit and the liquid supply module; Step 2, turn on the ultrasonic driving unit, input the input voltage and frequency of the multiple transducers of the ultrasonic transducer multi-source array; first output the high-frequency signal through the ultrasonic generating unit of the ultrasonic output module, and then drive the multiple transducers of the ultrasonic transducer multi-source array to generate an alternating signal with a constant frequency and increased amplitude through the ultrasonic driving unit of the ultrasonic output module, so as to obtain a high-frequency and high-amplitude sound wave; Step 3: Adjust the parameters of each transducer and the multi-sound source matching resonant atomization cavity to achieve a stable enhanced sound field in the cavity; through the multi-sound source matching resonant atomization cavity, the high-frequency and high-amplitude sound waves are coupled and superimposed to form an enhanced stable sound field, and the multi-source sound field is further enhanced; Step 4: Turn on the liquid pump controller and the liquid supply pump to allow the end of the liquid supply microneedle to stably output droplets, thereby breaking up and atomizing the droplets stably outputted from the end of the liquid supply microneedle in the cavity to achieve fine atomization.

[0014] The parameters that need to be adjusted in step 3 are: For the multi-sound source rectangular atomization chamber, the parameters that need to be adjusted are: the distance H between the piezoelectric transducer or magnetostrictive transducer and the lower wall of the atomization chamber, the height D of the multi-sound source rectangular atomization chamber, the inner cavity length Ls of the multi-sound source rectangular atomization chamber, and the height h of the multi-sound source matching resonance atomization chamber; For the multi-sound source cylindrical atomization chamber, the parameters that need to be adjusted are: the distance H between the piezoelectric transducer or magnetostrictive transducer and the lower wall of the atomization chamber, the diameter R of the multi-sound source cylindrical atomization chamber, the inner length Ls of the multi-sound source cylindrical atomization chamber, and the height h of the multi-sound source matching resonance atomization chamber; For the multi-sound source spherical atomization cavity, the parameters that need to be adjusted are: the radius r of the multi-sound source spherical atomization cavity and the height h of the multi-sound source matching resonance atomization cavity.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: Fine atomization technology usually has extremely high requirements on the particle size and concentration of atomized droplets. Traditional transducer atomization and vibrating film microporous atomization cannot guarantee the particle size concentration and there is a risk of nozzle blockage. The present invention proposes a multi-sound source coordinated atomization device and method for atomization scenarios of large flow and viscous liquids. The non-contact atomization device using multi-sound source coordination can ensure the particle size concentration while effectively solving the nozzle blockage problem. At the same time, by obtaining a higher sound field intensity, fine atomization of large flow liquids can be achieved, thereby improving atomization efficiency.

[0016] The present invention simultaneously inputs sound waves through multiple transducers and utilizes a resonant atomization cavity matched therewith to couple and superimpose multiple sound sources inside the cavity, thereby forming an enhanced stable sound field.

[0017] The present invention supplies liquid to the atomization cavity through a microneedle, and liquid droplets at the end of the microneedle use acoustic energy to achieve ultrafine and high-precision atomization, thereby improving the atomization accuracy and the interchangeability of the device.

[0018] The device of the present invention has a simple structure, strong stability, and low cost, and has great optimization and expansion space. It can couple and superimpose any number of sound sources and match corresponding resonant atomization devices to meet different practical needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow chart of the multi-sound source atomization method of the present invention; Figure 2 It is a cross-sectional view of a rectangular atomization chamber with multiple sound sources; Figure 3 It is a cross-sectional view of a multi-sound source cylindrical atomization chamber; Figure 4 It is a cross-sectional view of a multi-sound source spherical atomization chamber; In the figure, 1. ultrasonic output module; 11. ultrasonic generating unit; 12. ultrasonic driving unit; 2. liquid supply module; 21. liquid pump controller; 22. liquid supply pump; 23. liquid supply microneedle; 3. ultrasonic transducer multi-source array; 31. transducer A; 32. transducer B; 4. multi-source matching resonant atomization cavity; 42. multi-source rectangular atomization cavity; 43. multi-source cylindrical atomization cavity; 44. multi-source spherical atomization cavity. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with specific embodiments and drawings, but the protection scope of the present invention is not limited by the specific embodiments and drawings. Example

[0021] The multi-sound source atomization device of the present invention comprises an ultrasonic output module 1, a liquid supply module 2, an ultrasonic transducer multi-sound source array 3 and a multi-sound source matching resonant atomization chamber 4; the ultrasonic output module 1 is used to output a high-frequency signal and convert it into an alternating signal with a constant frequency and an increased amplitude; the liquid supply module 2 is used to stably output droplets; the ultrasonic transducer multi-sound source array 3 is used to convert the alternating signal into a high-frequency and large-amplitude ultrasonic signal; the multi-sound source matching resonant atomization chamber 4 is used to couple and superimpose the ultrasonic signals, output an enhanced sound field, and realize ultrafine atomization of a large flow of liquid.

[0022] The ultrasonic output module 1 includes an ultrasonic generating unit 11 and an ultrasonic driving unit 12. The ultrasonic generating unit 11 is used to output a high-frequency signal. The ultrasonic driving unit 12 is used to drive the ultrasonic transducer multi-sound source array 3 to convert the above-mentioned high-frequency signal into an alternating voltage signal with a constant frequency and increased amplitude. The alternating voltage signal can be a sinusoidal or square wave periodic signal.

[0023] The liquid supply module 2 includes a liquid pump controller 21 , a liquid supply pump 22 and a liquid supply microneedle 23 , and liquid droplets are stably outputted at the end of the liquid supply microneedle 23 .

[0024] The ultrasonic transducer multi-source array 3 includes multiple piezoelectric transducers, which are composed of a piezoelectric ceramic stack, front and rear end covers, and a horn; the entire transducer length should meet 1 / 4 wavelength or an integer multiple of 1 / 4 wavelength, thereby reducing the impedance of the connecting surface under resonance; the horn is made of a material with excellent acoustic properties, such as aluminum, aluminum alloy or titanium alloy.

[0025] Figure 2 It is a cross-sectional view of a multi-sound source rectangular atomization chamber. As shown in the figure, in this embodiment, the multi-sound source matching resonant atomization chamber 4 selects a multi-sound source rectangular atomization chamber 42 according to experimental requirements, atomization nozzle size requirements, flow requirements or atomization scale requirements. Example

[0026] The difference from Example 1 is that the horn is made of one of aluminum, aluminum alloy or titanium alloy with excellent acoustic properties.

[0027] Figure 3 It is a cross-sectional view of a multi-sound source cylindrical atomization chamber. As shown in the figure, in this embodiment, the multi-sound source matching resonant atomization chamber 4 selects a multi-sound source cylindrical atomization chamber 43 according to experimental requirements, atomization nozzle size requirements, flow requirements or atomization scale requirements. Example

[0028] The ultrasonic transducer multi-source array 3 includes a plurality of transducers, such as: transducer A31, transducer B32, etc.; Figure 4 It is a cross-sectional view of a multi-sound source spherical atomization chamber. As shown in the figure, in this embodiment, the multi-sound source matching resonant atomization chamber 4 selects a multi-sound source spherical atomization chamber 44 according to experimental requirements, atomization nozzle size requirements, flow requirements or atomization scale requirements.

[0029] Figure 1 The flowchart of the multi-sound source atomization method of the present invention is shown in the figure. The multi-sound source atomization method of the present invention specifically includes the following steps: Step 1: Build an atomization experimental platform, connect and fix the ultrasonic transducer multi-source array 3 and the matching multi-source matching resonant atomization cavity 4 on the experimental table, and connect the ultrasonic drive unit 12 and the liquid supply module 2; Step 2, turn on the ultrasonic driving unit 12, input and set the input voltage and frequency of multiple transducers of the ultrasonic transducer multi-source array 3, that is, the input voltage and frequency of transducer A31 and transducer B32; first output a high-frequency signal through the ultrasonic generating unit 11 of the ultrasonic output module 1, and then drive the multiple transducers of the ultrasonic transducer multi-source array 3 to generate an alternating signal with a constant frequency and increased amplitude through the ultrasonic driving unit 12 of the ultrasonic output module 1, so as to obtain a high-frequency and high-amplitude sound wave; Step 3: Adjust the parameters of each transducer and the multi-sound source matching resonant atomization cavity 4 to achieve a stable enhanced sound field in the cavity; through the multi-sound source matching resonant atomization cavity 4, the high-frequency and high-amplitude sound waves are coupled and superimposed to form an enhanced stable sound field, and the multi-source sound field is further enhanced; The parameters that need to be adjusted are: For the multi-sound source rectangular atomization chamber 42, the parameters that need to be adjusted are: the distance H between the piezoelectric transducer or magnetostrictive transducer and the lower wall of the atomization chamber, the height D of the multi-sound source rectangular atomization chamber 42, the inner cavity length Ls of the multi-sound source rectangular atomization chamber, and the height h of the multi-sound source matching resonance atomization chamber; For the multi-sound source cylindrical atomization chamber 43, the parameters that need to be adjusted are: the distance H between the piezoelectric transducer or magnetostrictive transducer and the lower wall of the atomization chamber, the diameter R of the multi-sound source cylindrical atomization chamber 43, the inner length Ls of the multi-sound source cylindrical atomization chamber, and the height h of the multi-sound source matching resonance atomization chamber; For the multi-sound source spherical atomization cavity 44, the parameters that need to be adjusted are: the radius r of the multi-sound source spherical atomization cavity, and the height h of the multi-sound source matching resonance atomization cavity.

[0030] Step 4: Turn on the liquid pump controller 21 and the liquid supply pump 22 to allow the end of the liquid supply microneedle 23 to stably output droplets, thereby breaking up and atomizing the droplets stably outputted from the end of the liquid supply microneedle 23 in the cavity to achieve fine atomization.

Claims

1. A multi-sound source atomization device, characterized in that: It includes an ultrasonic output module, a liquid supply module, an ultrasonic transducer multi-sound source array and a multi-sound source matching resonant atomization cavity; The ultrasonic output module is used to output a high-frequency signal and convert it into an alternating signal with a constant frequency and increased amplitude; The liquid supply module is used to stably output liquid droplets; The ultrasonic transducer multi-source array is used to convert the alternating signal into a high-frequency and large-amplitude ultrasonic signal; The multi-sound source matching resonant atomization cavity is used to couple and superimpose ultrasonic signals, output an enhanced sound field, and realize ultra-fine atomization of a large flow rate of liquid.

2. The multi-sound source atomization device according to claim 1, characterized in that: The ultrasonic output module includes an ultrasonic generating unit and an ultrasonic driving unit. The ultrasonic generating unit is used to output a high-frequency signal. The ultrasonic driving unit is used to drive the ultrasonic transducer multi-source array to convert the high-frequency signal into an alternating voltage signal with a constant frequency and increased amplitude.

3. The multi-sound source atomization device according to claim 2, characterized in that: The alternating voltage signal may be a sinusoidal or square wave periodic signal.

4. The multi-sound source atomization device according to claim 1, characterized in that: The liquid supply module comprises a liquid pump controller, a liquid supply pump and a liquid supply microneedle, and stably outputs liquid droplets at the end of the liquid supply microneedle.

5. The multi-sound source atomization device according to claim 1, characterized in that: The ultrasonic transducer multi-source array includes a plurality of transducers.

6. The multi-sound source atomization device according to claim 5, characterized in that: The transducer may be one or more of a piezoelectric transducer and a magnetostrictive transducer.

7. The multi-sound source atomization device according to claim 6, characterized in that: The piezoelectric transducer is composed of a piezoelectric ceramic stack, front and rear end covers, and a horn; the entire transducer length should satisfy 1 / 4 wavelength or an integer multiple of 1 / 4 wavelength, thereby reducing the impedance of the connection surface under resonance; The horn is made of a material with excellent acoustic properties, which may be aluminum, aluminum alloy or titanium alloy.

8. The multi-sound source atomization device according to claim 1, characterized in that: The multi-sound source matching resonance atomization cavity can be a multi-sound source rectangular atomization cavity, a multi-sound source cylindrical atomization cavity or a multi-sound source spherical atomization cavity according to experimental requirements, atomization nozzle size requirements, flow requirements or atomization scale requirements.

9. A multi-sound source atomization method, characterized in that: The specific steps include: Step 1: Build an atomization experimental platform, connect and fix the ultrasonic transducer multi-sound source array and the matching multi-sound source matching resonant atomization cavity on the experimental table, and connect the ultrasonic drive unit and the liquid supply module; Step 2, turn on the ultrasonic driving unit, input the input voltage and frequency of the multiple transducers of the ultrasonic transducer multi-source array; first output the high-frequency signal through the ultrasonic generating unit of the ultrasonic output module, and then drive the multiple transducers of the ultrasonic transducer multi-source array to generate an alternating signal with a constant frequency and increased amplitude through the ultrasonic driving unit of the ultrasonic output module, so as to obtain a high-frequency and high-amplitude sound wave; Step 3: Adjust the parameters of each transducer and the multi-sound source matching resonant atomization cavity to achieve a stable enhanced sound field in the cavity; through the multi-sound source matching resonant atomization cavity, the high-frequency and high-amplitude sound waves are coupled and superimposed to form an enhanced stable sound field, and the multi-source sound field is further enhanced; Step 4: Turn on the liquid pump controller and the liquid supply pump to allow the end of the liquid supply microneedle to stably output droplets, thereby breaking up and atomizing the droplets stably outputted from the end of the liquid supply microneedle in the cavity to achieve fine atomization.

10. The multi-sound source atomization method according to claim 9, characterized in that: The parameters that need to be adjusted in step 3 are: For the multi-sound source rectangular atomization chamber, the parameters that need to be adjusted are: the distance H between the piezoelectric transducer or magnetostrictive transducer and the lower wall of the atomization chamber, the height D of the multi-sound source rectangular atomization chamber, the inner cavity length Ls of the multi-sound source rectangular atomization chamber, and the height h of the multi-sound source matching resonance atomization chamber; For the multi-sound source cylindrical atomization chamber, the parameters that need to be adjusted are: the distance H between the piezoelectric transducer or magnetostrictive transducer and the lower wall of the atomization chamber, the diameter R of the multi-sound source cylindrical atomization chamber, the inner length Ls of the multi-sound source cylindrical atomization chamber, and the height h of the multi-sound source matching resonance atomization chamber; For the multi-sound source spherical atomization cavity, the parameters that need to be adjusted are: the radius r of the multi-sound source spherical atomization cavity and the height h of the multi-sound source matching resonance atomization cavity.

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