Ultrasonic cleaning equipment based on Fresnel lens
By using a Fresnel lens in ultrasonic cleaning equipment to focus sound wave energy at a focal point, the problems of high energy consumption, poor cleaning effect, and thermal damage are solved, achieving a highly efficient and energy-saving cleaning effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI UNIVERSITY OF TECHNOLOGY
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-19
AI Technical Summary
Existing ultrasonic cleaning equipment suffers from high energy consumption, poor cleaning effect, limited cleaning range, and may cause heat damage or surface scratches to the items being cleaned.
By using a Fresnel lens to connect the ultrasonic transducer to the cleaning container, the focusing characteristics of the Fresnel lens are utilized to concentrate the sound wave energy at the focal point, achieving efficient cleaning at low power and avoiding thermal effects and surface damage.
Improve cleaning performance at low power, save energy, reduce thermal damage to samples, avoid surface damage, expand the cleaning range, and reduce system cost and installation complexity.
Smart Images
Figure CN224253694U_ABST
Abstract
Description
Technical Field
[0001] This application relates to ultrasonic cleaning equipment, and more particularly to an ultrasonic cleaning equipment based on a Fresnel lens. Background Technology
[0002] Ultrasonic waves are a form of mechanical vibration energy propagation. By utilizing the cavitation, acceleration, and direct flow effects of ultrasound waves in liquids, they can directly and indirectly act on liquids and contaminants, dispersing, emulsifying, and peeling off contaminant layers to achieve cleaning. Currently, ultrasonic cleaning is widely used in various industrial and civilian fields. High-frequency ultrasonic cleaning has become an indispensable process in high-end and precision technology fields.
[0003] Ultrasonic cleaners based on cavitation primarily achieve their cleaning effect through the generation of high-speed, high-pressure microjets and localized high temperatures and pressures within the liquid. However, high-frequency ultrasound requires higher power to reach the cavitation threshold and achieve the cavitation effect. Insufficient power not only weakens the cavitation intensity, reduces the cleaning effect, and limits the cleaning range, but also leads to excessively long processing times, resulting in accumulated heat effects that can damage heat-sensitive samples and waste energy. Furthermore, low power can still induce cavitation corrosion, and the fluctuations in cavitation intensity caused by low power increase the risk of micro-damage to the surface. Summary of the Invention
[0004] This application provides an ultrasonic cleaning device based on a Fresnel lens to solve the technical problems of existing ultrasonic cleaning devices, such as high energy consumption, poor cleaning effect, limited cleaning range, and heat damage or surface scratches to the cleaned items.
[0005] Embodiments of this application provide an ultrasonic cleaning device based on a Fresnel lens, comprising:
[0006] Ultrasonic generator;
[0007] Ultrasonic transducer;
[0008] Fresnel lens and cleaning container, wherein:
[0009] The Fresnel lens is located between the output end of the transducer and the cleaning container, with one end face of the Fresnel lens tightly attached to the outer shell of the cleaning container and the other end face of the Fresnel lens tightly attached to the output end of the ultrasonic transducer.
[0010] The object to be cleaned in the cleaning container is placed at the focal point of the Fresnel lens.
[0011] Furthermore, in this application, both the Fresnel lens and the output end of the ultrasonic transducer are circular, and the outer diameter of the Fresnel lens is approximately the same as the outer diameter of the output end of the ultrasonic transducer.
[0012] Furthermore, in this application, the Fresnel lens includes 2n concentric rings, each ring comprising an inner arc and an outer arc, and the radius dimensions of each arc are as follows:
[0013]
[0014] in,
[0015] n is a radius constant, representing the nth radial arc from the center of the Neifer lens;
[0016] λ is the propagation wavelength of ultrasound within the cleaning solvent in the cleaning container;
[0017] F0 is the focal length of the Fresnel lens.
[0018] Furthermore, in this application, the thickness of the Fresnel lens is greater than or equal to the thickness of the outer wall of the cleaning container at its contact position.
[0019] Furthermore, in this application, the thickness of the Fresnel lens is as follows:
[0020]
[0021] in,
[0022] The i is the Fresnel lens thickness design parameter, i = 1, 3, 5...;
[0023] The k L Let k be the wavenumber of the Fresnel lens material, and k L =2π / λ L ;
[0024] k0 is the wavenumber of the cleaning solvent in the cleaning container.
[0025] Furthermore, in this application, the Fresnel lens is fixed to the ultrasonic transducer and the cleaning container.
[0026] Furthermore, in this application, there are multiple combinations of transducers and Fresnel lenses, and the focal point of each Fresnel lens is located at a corresponding cleaning station within the cleaning container, with each cleaning station being separated from the others.
[0027] Furthermore, in this application, the frequency f of the ultrasonic generator is ≥ 500 kHz.
[0028] Furthermore, in this application, the Fresnel lens is made of the same material as the cleaning container at its contact point.
[0029] Beneficial effects
[0030] This invention, by placing a Fresnel lens between the cleaning container and the ultrasonic transducer, enables ultrasonic focusing to increase the sound pressure and intensity in the focused area under low power conditions, thereby generating a cavitation effect in the focused area. Precise energy control achieves local high energy density, enhances the cavitation effect, reduces the overall power requirements of the system, improves the cleaning effect, and saves energy.
[0031] Compared to commonly used ultrasonic transducer arrays and system controls, the focusing method is lower in cost, wider in applicability, lower in application threshold, easier to install and replace, smaller in size, and more flexible in installation and operation.
[0032] This device can increase the sound pressure and sound intensity in the aggregation zone, reduce the time of a single cleaning, avoid damage to the sample due to the accumulation of thermal effects, and also avoid damage to the surface of the cleaned items caused by uneven cavitation due to low power. Attached Figure Description
[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:
[0034] Figure 1 This is a top view of the Fresnel lens used in the embodiments of this application;
[0035] Figure 2 This is a focusing principle diagram of the Fresnel lens used in the embodiments of this application;
[0036] Figure 3 This is a schematic diagram of the cleaning equipment in the embodiments of this application;
[0037] Figure 4 This is a cross-sectional view of the core working area of the cleaning equipment in an embodiment of this application;
[0038] Figure 5 This is a sound pressure distribution diagram without Fresnel lens used in the embodiments of this application;
[0039] Figure 6 This is a sound pressure distribution diagram using a Fresnel lens in an embodiment of this application.
[0040] The meanings of the various reference numerals in the figure are as follows:
[0041] 1. Ultrasonic transducer; 2. Cleaning container; 3. Bottom of cleaning container; 4. Fresnel lens; 5. Connecting bar; 6. Ultrasonic generator; 7. Focal point. Detailed Implementation
[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0043] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0045] like Figure 3 The diagram shown is a structural schematic of an ultrasonic cleaning device based on a Fresnel lens 3 according to an embodiment of this application. Figure 3 It can be seen that the cleaning equipment includes:
[0046] The ultrasonic generator 4 mainly converts electrical energy into a high-frequency AC signal that matches the ultrasonic transducer 1 by using a linear amplifier circuit or a switching power supply circuit.
[0047] Transducer 1 refers to a device that converts electrical energy into acoustic energy. In this embodiment, it specifically refers to a transmitting transducer 1 that converts electrical energy into acoustic energy, that is, it converts high-frequency electrical energy into mechanical vibration through transducer 1. In this embodiment, the transducer 1 is a piezoelectric transducer 1, which converts electrical signals into mechanical vibration through the piezoelectric effect. It has advantages such as high electroacoustic conversion efficiency, low raw material price, convenient manufacturing, and resistance to aging.
[0048] Cleaning container 2 is used to hold the cleaning solvent and the items to be cleaned. Commonly used cleaning solvents include water-based solvents and solvent-based solvents. Water-based solvents, such as pure water, alkaline or acidic aqueous solutions, and aqueous solutions with added surfactants, are suitable for most cleaning tasks, especially in situations requiring high cleanliness, such as for precision mechanical parts and electronic components. Solvent-based solvents include hydrocarbon solvents (such as gasoline and kerosene), alcohol solvents (such as ethanol and isopropanol), and ketone and ether solvents, which are suitable for removing contaminants such as grease and oil.
[0049] In this embodiment, a Fresnel lens 3 is also provided, such as... Figure 1 The diagram shows a schematic representation of the Fresnel lens 3 used in an embodiment of this application. Fresnel lenses 3 mainly include two types: Soret FZP and Phase Reversal FZP. They can be made from various materials, but are often manufactured using PLA 3D printing, typically consisting of multiple concentric rings with smooth surfaces on both sides. Fresnel lenses 3 are characterized by low cost and good focusing ability. Figure 1 As shown, this embodiment uses a circular Fresnel lens 3, which includes several concentric rings, and the rings are connected to each other by connecting strips 31 to ensure the concentricity of the rings.
[0050] In this embodiment, as Figure 2 As shown, the Fresnel lens 3 is located between the output end of the transducer 1 and the cleaning container 2, and one end face of the Fresnel lens 3 is tightly attached to the outer shell of the cleaning container 2, while the other end face of the Fresnel lens 3 is tightly attached to the output end of the transducer 1; the object to be cleaned in the cleaning container 2 is placed at the focal point 5 of the Fresnel lens 3.
[0051] By tightly fitting the Fresnel lens 3 to the output end of the transducer 1 and the outer shell of the cleaning container 2, the acoustic energy output from the ultrasonic transducer 1 directly enters the Fresnel lens 3 and then directly into the cleaning container 2. The medium through which the acoustic waves pass is simple, which can efficiently exert the effect of the Fresnel lens 3. If the fit is not tight, there will be gaps or other unnecessary structures between the Fresnel lens and the transducer 1 or between the Fresnel lens and the cleaning container 2, which can easily lead to energy dissipation and even affect the waveform, resulting in uncontrollable focusing and cleaning effects.
[0052] To achieve the aforementioned tight fit, in some preferred embodiments, the Fresnel lens 3 is fixed to the transducer 1 and the cleaning container 2. The fixing method is typically mechanical, for example, by using a locking structure with a through hole to engage the Fresnel lens 3 within the through hole, and fixing both ends of the through hole to the outer shells of the ultrasonic transducer 1 and the cleaning container 2 respectively, thus achieving the fixing effect between the Fresnel lens 3 and the two components. Alternatively, a simpler method is to apply adhesive to both ends of the Fresnel lens 3 to adhere it to the outer shells of the ultrasonic transducer 1 and the cleaning container 2. The specific form of the fixing method can vary, and those skilled in the art can choose according to their needs; this embodiment does not impose specific limitations in this regard.
[0053] This embodiment utilizes the focusing characteristics of Fresnel lens 3. By placing Fresnel lens 3 at the output end of transducer 1, the ultrasonic waves emitted from ultrasonic transducer 1 are focused, thereby concentrating energy at focal point 5. This results in higher sound pressure and sound intensity at focal point 5, making it easier to generate cavitation effect in the focusing area. The energy distribution in non-focal point 5 areas is less, thus improving energy utilization and the cleaning effect in the focal point 5 area.
[0054] To ensure the cleaning effect, the frequency of the ultrasonic generator 4 should be as high as possible. Since the Fresnel lens 3 is used in this application for focusing effect, high-frequency ultrasonic waves can still be focused and cavitation effect can be generated under controllable power. Therefore, in this embodiment, the frequency f of the ultrasonic generator 4 is preferably ≥ 500 kHz.
[0055] In some preferred embodiments, both the Fresnel lens 3 and the output end of the ultrasonic transducer 1 are circular, and the outer diameter of the Fresnel lens 3 is approximately the same as the outer diameter of the output end of the ultrasonic transducer 1. This design aims to maximize the collection and focusing of the energy output by the ultrasonic transducer 1, thereby achieving high energy utilization and good cleaning effect.
[0056] In addition to the outer diameter design, the dimensions of the inner ring of the Fresnel lens 3 also have corresponding design requirements, such as... Figure 1 As shown, the Fresnel lens 3 includes 2n concentric rings, each ring comprising an inner arc and an outer arc, and the radius dimensions of each arc are as follows:
[0057]
[0058] in,
[0059] n is a radius constant, representing the nth radial arc from the center of the Neifer lens;
[0060] λ is the propagation wavelength of ultrasound in the solution within cleaning container 2;
[0061] F0 is the focal length of Fresnel lens 3.
[0062] In some preferred embodiments, in order to reduce the influence of the wall thickness of the cleaning container 2 on the position of the focal point 5 of the Fresnel lens 3, the thickness of the cleaning container 2 should ideally be as small as possible. However, in order to ensure the reliability of the cleaning container 2, the thickness of the cleaning container 2 is preferably between 1.0 mm and 1.2 mm.
[0063] In this embodiment, the thickness of the Fresnel lens 3 should ideally be as large as possible to mitigate the influence of the thickness of the cleaning container 2. However, to consider factors such as the cost of the Fresnel lens 3, its thickness is set to be greater than or equal to the thickness of the outer wall of the cleaning container 2 at its contact point. In some preferred embodiments, the material of the Fresnel lens 3 is the same as the material of the cleaning container 2 at its contact point to reduce the impact of different media on sound wave transmission.
[0064] For greater precision, the thickness of the Fresnel lens 3 can be calculated using the following formula:
[0065]
[0066] in,
[0067] The i is the design parameter for the thickness of the Fresnel lens 3, i = 1, 3, 5...;
[0068] The k L Let k be the wavenumber of the Fresnel lens material 3, and k L =2π / λ L ;
[0069] k0 is the wavenumber of the cleaning solvent in the cleaning container 2.
[0070] In some preferred embodiments, if the size of the cleaning container 2 allows, multiple items to be cleaned can be cleaned simultaneously within the same cleaning container 2. Therefore, multiple combinations of ultrasonic transducers 1 and Fresnel lenses 3 can be provided. The focal length of each Fresnel lens 3 corresponds to a cleaning station within the cleaning container 2. To avoid affecting the cleaning effect between them, the cleaning stations should be separated from each other. Figure 4 For example, Figure 4The illustration shows a combination of an ultrasonic transducer 1 and a Fresnel lens 3 positioned at the center of the bottom 21 of the cleaning container 2. Multiple such combinations can be arranged in an array on the bottom 21 of the cleaning container 2, or on the side walls of the cleaning container 2, as needed. Each combination can use the same ultrasonic transmitter or each combination can be equipped with its own ultrasonic generator 4 to accommodate the cleaning needs of multiple items. Although the arrangement of the multiple combinations is not shown in the accompanying drawings of this embodiment, those skilled in the art will understand the solution described in this embodiment based on the description in this application.
[0071] by Figure 4 The embodiment of the scheme is used to perform ultrasonic energy simulation to obtain, as Figure 6 The diagram shown. Figure 4 After removing Fresnel lens 3, ultrasonic energy simulation was performed to obtain results such as... Figure 5 The diagram shown is attached. Figure 5 and Figure 6 In the image above, the cross-section column represents a simulation of the interior of cleaning container 2; acoustic energy is displayed in purple for comparison. Figure 5 and Figure 6 It can be seen that with the addition of Fresnel lens 3, the sound wave energy is focused, and the energy distribution at positions other than focal point 5 is less. Without Fresnel lens 3, the sound wave energy is dispersed. Therefore, the simulation image can prove that the ultrasonic cleaner with Fresnel lens 3 has the advantages of energy focusing and good cleaning effect.
[0072] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A Fresnel lens-based ultrasonic cleaning apparatus, characterized by comprising: include: Ultrasonic generator; Ultrasonic transducer; Fresnel lens and cleaning container, wherein: The Fresnel lens is located between the output end of the ultrasonic transducer and the cleaning container, with one end face of the Fresnel lens tightly attached to the outer shell of the cleaning container and the other end face of the Fresnel lens tightly attached to the output end of the ultrasonic transducer. The object to be cleaned in the cleaning container is placed at the focal point of the Fresnel lens.
2. The cleaning apparatus according to claim 1, characterized in that Both the Fresnel lens and the output end of the ultrasonic transducer are circular, and the outer diameter of the Fresnel lens is approximately the same as the outer diameter of the output end of the ultrasonic transducer.
3. The cleaning apparatus of claim 2, wherein The Fresnel lens comprises 2n concentric rings, each ring consisting of an inner arc and an outer arc, and the radii of each arc are as follows: in, n is a radius constant, representing the nth radial arc from the center of the Neifer lens; λ is the propagation wavelength of ultrasound within the cleaning solvent in the cleaning container; F0 is the focal length of the Fresnel lens.
4. The cleaning apparatus of claim 1, wherein The thickness of the Fresnel lens is greater than or equal to the thickness of the outer wall of the cleaning container at its contact point.
5. The cleaning apparatus of claim 4, wherein The thickness of the Fresnel lens is as follows: in, The i is the Fresnel lens thickness design parameter, i = 1, 3, 5...; The k L is the wave number of the Fresnel lens material, and k L = 2π / λ L ; k0 is the wavenumber of the cleaning solvent in the cleaning container.
6. The cleaning apparatus of claim 1, wherein The Fresnel lens is fixed to the ultrasonic transducer and the cleaning container.
7. The cleaning apparatus of claim 1, wherein The combination of transducer and Fresnel lens is multiple, and the focal point of each Fresnel lens is located at the corresponding cleaning station within the cleaning container, with each cleaning station separated from the others.
8. The cleaning apparatus of claim 1, wherein, The frequency f of the ultrasonic generator is ≥ 500 kHz.
9. The cleaning apparatus of claim 1, wherein, The Fresnel lens is made of the same material as the cleaning container at its contact point.