Dual frequency high power liquid handling ultrasonic transducer

Abstract

The embodiment of the present application relates to a kind of dual-frequency high-power liquid processing ultrasonic transducer, comprising: one end of amplitude transformer is connected with sandwich transducer to form longitudinal displacement output structure;Metallic pipe is provided with mounting hole in side surface, mounting hole is connected with amplitude transformer by connecting piece arranged in the conical end of amplitude transformer, both ends of metallic pipe are provided with concave flexure shell;The half-wave mode and full-wave mode of longitudinal displacement output structure make the radial vibration and axial vibration of metallic pipe, form the complex frequency operating mode of ultrasonic transducer.The embodiment of the present application excites the radial vibration and longitudinal vibration of metallic pipe by the half-wave and full-wave mode of longitudinal displacement output structure respectively, realizes the dual-frequency operating mode of ultrasonic transducer;Concave flexure shell amplifies the radial vibration displacement of metallic pipe in phase, increases the acoustic radiation area of metallic pipe axial vibration, improves the acoustic radiation power of ultrasonic transducer and the uniformity of transducer radiation sound field.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic transducer technology, and more particularly to a dual-frequency high-power liquid processing ultrasonic transducer. Background Technology

[0002] High-power ultrasound (HPU) is a promising green emerging technology with broad application prospects and great potential, playing a vital role in industrial production. It can be used to clean precision components, remove surface dirt and oxides, and improve product quality and production efficiency. The ultrasonic transducer is the core component of HPU technology, and research on its transmission efficiency, power capacity, and ultrasonic intensity is a hot topic in the industry. Currently, the most widely used type in high-power ultrasound is the sandwich piezoelectric transducer, which can convert mechanical energy into electrical energy through the piezoelectric effect, offering advantages such as high mechanical strength, large vibration displacement, and high electromechanical efficiency.

[0003] The most widely used vibration elements are mostly round bars, tubes, rings, circular or rectangular plates, or combinations thereof, with stable or variable cross-sections. For example, a metal bar with a variable cross-section can be used as an amplitude transformer in high-power applications to amplify the vibration displacement of the transducer, while round tubes, rings, or spherical metal structures can be used as ultrasonic radiators to generate different modes of vibration and increase the radiation range of the transducer.

[0004] Traditional multi-frequency driven longitudinal-bending composite mode ultrasonic transducers mainly suffer from the following problems: 1. Differences in electromechanical parameters at the common frequency of multiple vibration modes lead to difficulties in power supply matching; 2. Different stress and velocity distributions and displacement node positions in multiple vibration modes make mechanical fixation difficult; 3. Mutual coupling exists between multiple vibration modes. Existing rod-shaped and tubular liquid handling ultrasonic transducers have been widely used because they achieve strong radiated acoustic power through mode switching between longitudinal vibration or longitudinal-radial vibration. However, the working principle of these rod-shaped and tubular transducers is to longitudinally excite the rod or tube to generate radial acoustic radiation. Due to the high longitudinal wave velocity in the rod or tube, its longitudinal wave wavelength is long, resulting in significant non-uniformity of the radiated sound field along the length of the rod or tube, large standing wave characteristics, and insufficient power.

[0005] Therefore, it is necessary to improve one or more of the problems existing in the above-mentioned related technical solutions.

[0006] It should be noted that this section is intended to provide background or context for the technical solutions of the invention as set forth in the claims. The description herein does not imply acceptance as prior art simply because it is included in this section. Summary of the Invention

[0007] The purpose of this invention is to provide a dual-frequency high-power liquid processing ultrasonic transducer, thereby overcoming at least to some extent one or more problems caused by the limitations and defects of related technologies.

[0008] According to an embodiment of this disclosure, a dual-frequency high-power liquid processing ultrasonic transducer is provided, comprising:

[0009] It includes a sandwich transducer, an amplitude transformer, and a metal tube;

[0010] The amplitude transformer is a stepped amplitude transformer composed of a conical part and a cylindrical part connected longitudinally to a piezoelectric ceramic crystal. One end of the amplitude transformer is connected to the sandwich transducer to form a longitudinal displacement output structure.

[0011] The side of the metal tube is provided with a mounting hole. The mounting hole connects the metal tube to the amplitude rod through a connector provided on the top surface of the conical part of the amplitude rod. Both ends of the metal tube are provided with concave tension shells, and the concave part of the concave tension shell is provided inside the metal tube.

[0012] The half-wavelength mode of the longitudinal displacement output structure causes the metal tube to vibrate radially, while the full-wavelength mode causes the metal tube to vibrate axially, thus forming a dual-frequency operating mode of the ultrasonic transducer.

[0013] In one embodiment of the present invention, the sandwich transducer includes a piezoelectric ceramic crystal stack, a metal block, and a metal base, wherein the piezoelectric ceramic crystal stack, the metal block, and the metal base are fixedly connected by stress bolts.

[0014] In one embodiment of the present invention, the piezoelectric ceramic stack is formed by stacking multiple PZT-4 blocks.

[0015] In one embodiment of the present invention, in the sandwich transducer, the radius of the metal base is 15.5mm-30.5mm, the height of the metal base is 2mm-32mm, the radius of the metal block is 15.5mm-30.5mm, and the height of the metal block is 3mm-33mm.

[0016] In one embodiment of the present invention, in the amplitude transformer, the radius of the cylindrical part is 15.5mm-30.5mm, the height of the cylindrical part is 15mm-30mm, the radius of the top circle of the conical part is 5mm-13mm, and the height of the conical part is 45mm-65mm.

[0017] In one embodiment of the present invention, the inner diameter of the metal tube is 33mm-45mm, the outer diameter of the metal tube is 55mm-74mm, and the length of the metal tube is 90mm-100mm.

[0018] In one embodiment of the present invention, the concave tension shell is composed of a basin-shaped shell and a truncated cone. One end of the basin bottom of the basin-shaped shell is connected to one end of the large end face of the truncated cone to form an integral concave tension shell. The bottom of the basin shell and the truncated cone form the bottom of the concave tension shell.

[0019] In one embodiment of the present invention, the basin-shaped shell has a bottom radius of 15mm-30mm, the small end face radius of the truncated cone is 2mm-15mm, the depth of the basin-shaped shell is 4mm-10mm, the bottom thickness of the concave bending shell is 3mm-8mm, the side thickness of the basin-shaped shell is 2mm-5mm, and the rim thickness of the basin-shaped shell is 2mm-6mm.

[0020] In one embodiment of the present invention, the frequency of the half-wavelength mode is 14.5KHz-16KHz.

[0021] In one embodiment of the present invention, the frequency of the full-wavelength mode is 28KHz-30KHz.

[0022] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0023] This invention provides a dual-frequency high-power ultrasonic transducer for liquid processing. On the one hand, by exciting the radial and longitudinal vibrations of a metal tube in half-wavelength and full-wavelength modes of the longitudinal displacement output structure, the dual-frequency working mode of the ultrasonic transducer is realized. On the other hand, the concave bending shells at both ends of the metal tube amplify the radial vibration displacement of the metal tube in phase, increasing the acoustic radiation area of ​​the axial vibration of the metal tube and improving the acoustic radiation power and uniformity of the radiated sound field of the ultrasonic transducer. Furthermore, compared with traditional longitudinal tubular or rod-type ultrasonic transducers, the longitudinally and radially coupled metal tube, as a radiator, effectively reduces the one-dimensional size, making the ultrasonic transducer structure more compact. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 This diagram illustrates the structure of a dual-frequency high-power liquid processing ultrasonic transducer according to an exemplary embodiment of the present invention.

[0026] Figure 2This diagram shows a cross-sectional view of a dual-frequency high-power liquid processing ultrasonic transducer according to an exemplary embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the cross-section of a metal circular tube with a concave bending shell in an exemplary embodiment of the present invention;

[0028] Figure 4 This diagram shows a cross-sectional view of the concave bending shell in an exemplary embodiment of the present invention.

[0029] Figure 5 The diagram shows a half-section model of the longitudinal displacement output structure and a quarter-section model of the metal circular tube with a concave bending shell in the simulation experiment of this disclosure.

[0030] Figure 6 The first and second frequency mode shapes of the longitudinal displacement output structure in the simulation experiment of this disclosure are shown.

[0031] Figure 7 The radial and axial vibration mode diagrams of a metal circular tube with a concave bending shell are shown in the simulation experiment of this disclosure.

[0032] Reference numerals: 100, metal circular tube; 101, concave bending shell; 200, amplitude transformer; 201, stepped amplitude transformer; 300, sandwich transducer; 301, metal block; 302, metal base; 400, piezoelectric ceramic crystal stack. Detailed Implementation

[0033] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the invention will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0034] Furthermore, the accompanying drawings are merely illustrative diagrams of embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0035] This example embodiment provides a dual-frequency high-power ultrasonic transducer for liquid treatment, referenced... Figure 1 As shown, the dual-frequency high-power liquid processing ultrasonic transducer may include: a metal circular tube 100, an amplitude transformer 200, and a sandwich transducer 300.

[0036] The amplitude transformer 200 is formed by a stepped amplitude transformer 201 composed of a conical part and a cylindrical part, which is connected to the piezoelectric ceramic crystal in the longitudinal direction. One end of the amplitude transformer 200 is connected to the sandwich transducer 300 to form a longitudinal displacement output structure.

[0037] The metal tube 100 has a mounting hole on its side. The mounting hole connects the metal tube 100 to the amplitude rod 200 through a connector provided on the top circular surface of the conical part of the amplitude rod 200. Both ends of the metal tube 100 are provided with concave bending shells 101, and the concave part of the concave bending shells 101 is provided inside the metal tube 100.

[0038] The half-wavelength mode of the longitudinal displacement output structure causes the metal tube 100 to vibrate radially, while the full-wavelength mode causes the metal tube 100 to vibrate axially, thus forming a dual-frequency operating mode of the ultrasonic transducer.

[0039] It should be understood that, compared with traditional longitudinal tubular or rod-type ultrasonic transducers, the metal circular tube 100 of this application is set as the longitudinal diameter of the radiator and connected to the amplitude transformer 200, which effectively reduces the one-dimensional size and makes the ultrasonic transducer structure more compact.

[0040] It is also important to understand that the sandwich transducer 300 is a longitudinal sandwich piezoelectric ultrasonic transducer.

[0041] It is also necessary to understand that in the longitudinal displacement output structure composed of the sandwich transducer 300 and the amplitude transformer 200 and the metal tube 100 with concave tension shell 101, the first-order axial frequency of the longitudinal displacement output structure is approximately equal to the radial frequency of the metal tube 100 with concave tension shell 101. Thus, the first-order axial frequency of the longitudinal displacement output structure excites the radial vibration of the metal tube 100 with concave tension shell 101. The second-order axial frequency of the longitudinal displacement output structure is approximately equal to the axial frequency of the metal tube 100 with concave tension shell 101. Thus, the second-order axial frequency of the longitudinal displacement output structure excites the axial vibration of the metal tube 100 with concave tension shell 101.

[0042] By using a dual-frequency high-power liquid-processed ultrasonic transducer, on the one hand, the radial and longitudinal vibrations of the metal tube 100 are excited by the half-wavelength and full-wavelength modes of the longitudinal displacement output structure, respectively, thus realizing the dual-frequency working mode of the ultrasonic transducer; on the other hand, the concave bending shells 101 at both ends of the metal tube 100 amplify the radial vibration displacement of the metal tube 100 in phase, increasing the acoustic radiation area of ​​the axial vibration of the metal tube 100 and improving the acoustic radiation power and uniformity of the radiated sound field of the ultrasonic transducer; furthermore, compared with traditional longitudinal tubular or rod-type ultrasonic transducers, the metal tube 100 with its longitudinal diameter set, connected to the amplitude transformer 200 as a radiator, effectively reduces the one-dimensional size, making the ultrasonic transducer structure more compact.

[0043] Below, we will refer to Figures 1 to 6 The various parts of the dual-frequency high-power liquid processing ultrasonic transducer described in this exemplary embodiment will be explained in more detail.

[0044] In one embodiment, the sandwich transducer 300 includes a piezoelectric ceramic crystal stack 400, a metal block 301, and a metal base 302, which are fixedly connected by stress bolts. The piezoelectric ceramic crystal stack 400 is composed of multiple PZT-4 chips stacked together. It should be understood that by cascading the piezoelectric ceramic crystal stack 400 and the stepped amplitude transformer 201, a higher vibration displacement output and a larger power capacity are achieved compared to traditional sandwich transducers. It should also be understood that the piezoelectric ceramic crystal stack 400 uses PZT-4 chips, stacked from four PZT-4 chips. PZT-4 has good stability, high precision, high energy conversion efficiency, fast response speed, and its mechanical quality factor, piezoelectric coefficient, and electromechanical coupling constant are significantly better than those of lead-free piezoelectric ceramic crystal stacks.

[0045] In one embodiment, in the sandwich transducer 300, the radius of the metal base 302 is R1, 15.5mm≤R1≤30.5mm, the height of the metal base 302 is L1, 2mm≤L1≤32mm, the radius of the metal block 301 is R4, 15.5mm≤R4≤30.5mm, and the height of the metal block 301 is L3, 3mm≤L3≤33mm. It should be understood that the piezoelectric ceramic crystal stack 400 uses PZT-4, which is composed of multiple stacked PZT-4 blocks. The inner diameter of each PZT-4 is R2=8mm, the outer diameter of each PZT-4 is R3=25mm, and the height of each PZT-4 is L2=5mm. The sandwich transducer 300 and the amplitude transformer 200 are connected in series along the longitudinal mechanical end to form the longitudinal displacement output structure of the ultrasonic transducer. By changing the geometry of the longitudinal displacement output structure and the relative positions of the two sets of piezoelectric ceramic stacks 400, the fundamental half-wavelength mode and the first harmonic full-wavelength mode of its longitudinal vibration both have a large effective electromechanical coupling coefficient.

[0046] In one embodiment, in the amplitude transformer 200, the radius of the cylindrical portion is R5, 15.5mm≤R5≤30.5mm, and the height of the cylindrical portion is L4, 15mm≤L4≤30mm. The radius of the top circle of the conical portion is R6, 5mm≤R6≤13mm, and the height of the conical portion is L5, 45mm≤L5≤65mm. It should be understood that the amplitude transformer 200, consisting of a stepped amplitude transformer 201 composed of a conical and cylindrical portion, is longitudinally connected to a piezoelectric ceramic crystal. The amplitude transformer 200 increases the power capacity of the sandwich transducer 300 and the secondary amplification of the longitudinal vibration displacement output. The conical portion of the amplitude transformer 200 reduces the connection area between the amplified vibration displacement output end and the metal tube 100, which is more conducive to exciting pure radial and axial vibrations of the metal tube 100. The introduction of the piezoelectric ceramic crystal stack 400 into the amplitude transformer 200 aims to further increase the power capacity and longitudinal displacement output of the ultrasonic transducer.

[0047] In one embodiment, such as Figures 3-4 As shown, the inner diameter of the metal tube 100 is R7, 33mm≤R7≤45mm; the outer diameter of the metal tube 100 is R8, 55mm≤R8≤74mm; and the length of the metal tube 100 is L6, 90mm≤L6≤100mm. It should be understood that by designing the geometry of the metal tube 100 so that its radial and axial vibration frequencies are approximately equal to the fundamental frequency and first harmonic frequency of the longitudinal displacement output system, respectively, the half-wavelength mode of the longitudinal displacement output system excites the radial vibration of the metal tube 100, corresponding to the low-frequency mode of the ultrasonic transducer. The full-wavelength mode of the longitudinal displacement output system excites the axial vibration of the metal tube 100, corresponding to the high-frequency mode of the ultrasonic transducer, thereby realizing the complex-frequency operating mode of the ultrasonic transducer. When the longitudinal displacement output structure excites the radial vibration of the metal tube 100 in half-wavelength mode, the ultrasonic transducer is in low-frequency mode. At this time, the radial vibration of the metal tube 100 drives the concave bending shell 101 to produce bending vibration. The radial vibration displacement of the metal tube 100 is amplified by the concave bending shell 101 to produce a larger axial displacement (ΔS). A >ΔS R When the metal tube 100 expands and contracts radially, the concave bending shell 101 expands and contracts in phase. The radiated sound pressures of the metal tube 100 and the concave bending shell 101 in the sound field are superimposed in phase, resulting in high-power radiation from both the metal tube 100 and the concave bending shell 101. When the full-wavelength mode of the longitudinal displacement output structure excites the axial vibration of the metal tube 100, the ultrasonic transducer is in high-frequency mode. The concave bending shell 101, as the sound radiation surface of the axial vibration of the metal tube 100, increases the end face radiation area of ​​the axial vibration of the metal tube 100, improves the sound radiation efficiency of the ultrasonic transducer, and enables the ultrasonic transducer to achieve high-power radiation in both operating modes.

[0048] In one embodiment, such as Figure 3 As shown, the concave tension shell 101 is composed of a basin-shaped shell and a truncated cone. One end of the basin bottom of the basin-shaped shell is connected to one end of the large end face of the truncated cone, forming an integral concave tension shell 101. The bottom of the basin-shaped shell and the truncated cone form the bottom of the concave tension shell 101. The basin bottom radius of the basin-shaped shell is R9, 15mm≤R9≤30mm; the small end face radius of the truncated cone is R10, 2mm≤R10≤15mm; the depth of the basin-shaped shell is h1, 4mm≤h1≤10mm; the bottom thickness of the concave tension shell 101 is h2, 3mm≤h2≤8mm; the side thickness of the basin-shaped shell is h3, 2mm≤h3≤5mm; and the rim thickness of the basin-shaped shell is h4, 2mm≤h4≤6mm. It is important to understand that concave bending shells 101 are attached to both ends of the metal tube 100 radiator. Different parts of the concave bending shell 101 will have different thicknesses to accommodate the functional requirements of different sections. In particular, the bottom region of the concave bending shell 101 will also use a truncated cone of unequal thickness. The first-order longitudinal vibration of the longitudinal vibration system excites the radial vibration of the metal tube 100, driving the bending structure. The second-order longitudinal vibration of the longitudinal vibration system excites the axial vibration of the metal tube 100, driving the bending structure, while simultaneously satisfying the requirement for high-power radiation.

[0049] It is also necessary to understand that R and R′ are the radii of the upper end of the concave bending shell of the metal tube before and after the stretching motion, respectively. The upper end of the basin-shaped shell is the end corresponding to the bottom of the basin, i.e., ΔS R This represents the change in radius at the upper end of the basin-shaped shell of the concave bending shell before and after the metal tube's stretching motion.

[0050] r is the size of the inner diameter of the concave flat bottom of the bending shell, which is the radius of the bottom of the basin-shaped shell. It can be assumed that the metal tube remains unchanged before and after stretching.

[0051] L is the length of the inverted conical surface of the bent shell, which is the side length of the basin-shaped shell. It is also assumed that the metal tube remains unchanged before and after stretching.

[0052] h and h′ represent the depth of the concave surface of the concave bending shell before and after the metal tube's stretching motion, respectively; that is, the depth of the basin-shaped shell of the concave bending shell before and after the metal tube's stretching motion.

[0053] ΔS A This represents the change in the depth of the concave surface of the concave tension shell before and after the stretching motion of the metal tube.

[0054] According to the model, we have: ΔS R =R′-R, ΔSA =h′-h

[0055] Based on the state of the metal tube before it stretches, we have: (Rr)² + h² = L²

[0056] Based on the state of the stretched metal tube, we have: (R′-r)²+h′²=L²

[0057] Then we have: (Rr)² + h² = (R′ - r)² + h′²

[0058] Let ΔR = R′ - R, ΔS A Substituting h′-h into (Rr)²+h²=(R′-r)²+h′²

[0059] Organized

[0060] Continue organizing

[0061] Ignore ΔR 2 Infinitesimals, when rearranged, yield:

[0062]

[0063] To achieve ΔSA > ΔSR, it is necessary to control the depth h of the concave shell so that the values ​​of R and Rr are much greater than h. Therefore, the radial vibration of the piezoelectric metal tube can be excited to generate a larger amplitude of bending shell vibration.

[0064] In one embodiment, the frequency of the half-wavelength mode is 14.5 kHz to 16 kHz, and the frequency of the full-wavelength mode is 28 kHz to 30 kHz. It should be understood that by utilizing the sandwich transducer 300 and the amplitude transformer 200 to construct a longitudinal displacement output structure, the half-wavelength and full-wavelength modes respectively excite the radial and longitudinal vibrations of the metal tube 100, achieving a dual-frequency operating mode for the ultrasonic transducer. The concave bending shell 101 amplifies the radial vibration displacement of the metal tube 100 in phase, increasing the acoustic radiation area of ​​the axial vibration of the metal tube 100, which can effectively improve the acoustic radiation power of the ultrasonic transducer. The conical amplitude transformer 200 reduces the connection area with the metal tube 100 at its vibration displacement amplification output end, which is more conducive to exciting pure radial and axial vibrations of the metal tube 100.

[0065] To further verify the effectiveness of the dual-frequency high-power liquid treatment ultrasonic transducer proposed in this disclosure, the following simulation experiments were conducted:

[0066] In the simulation experiment, in the longitudinal sandwich piezoelectric ultrasonic transducer, the metal base 302 has a radius R1 = 25.5 mm and a height L1 = 20 mm, the piezoelectric ceramic ring, i.e., PZT-4, has an inner diameter R2 = 8 mm, an outer diameter R3 = 25 mm, and a height L2 = 5 mm, and the metal block 301 has a radius R4 = 25.5 mm and a height L3 = 15 mm.

[0067] In the amplitude transformer 200, the radius of the cylindrical part is R5 = 25.5 mm and the height is L4 = 21 mm, while the radius of the upper circular surface of the conical part is R6 = 9 mm and the height is L5 = 54 mm.

[0068] In the metal tube 100, the inner diameter R7 = 44 mm, the outer diameter R8 = 60 mm, and the height L6 = 96 mm.

[0069] In the concave bending shell 101, the radius of the bottom of the basin-shaped shell is R9 = 30 mm, the radius of the small end face of the truncated cone is R10 = 15 mm, the depth of the basin-shaped shell is h1 = 6 mm, the thickness of the bottom of the concave bending shell 101 is h2 = 5 mm, the thickness of the side of the basin-shaped shell is h3 = 2.33 mm, and the thickness of the rim of the basin-shaped shell is h4 = 2 mm.

[0070] The half-wavelength mode of the longitudinal displacement output structure is 15198Hz, corresponding to the first-order frequency of the longitudinal displacement output structure, and the full-wavelength mode of the longitudinal displacement output structure is 28786Hz, corresponding to the second-order frequency of the longitudinal displacement output structure.

[0071] In the longitudinal displacement output structure composed of the sandwich transducer 300 and the amplitude transformer 200, and the metal tube 100 with longitudinal-radial coupled vibration of the concave tension shell 101, the first-order axial frequency of the longitudinal displacement output structure is approximately equal to the radial frequency of the metal tube 100 with the concave tension shell 101, and the second-order axial frequency of the longitudinal displacement output structure is approximately equal to the axial frequency of the metal tube 100 with the concave tension shell 101. Thus, the radial vibration of the metal tube 100 with the concave tension shell 101 is excited by the first-order axial frequency of the longitudinal displacement output structure, and the axial vibration of the metal tube 100 with the concave tension shell 101 is excited by the second-order axial frequency of the longitudinal displacement output structure.

[0072] like Figure 5 As shown, Figure 5 The left side shows the 1 / 2 section model of the longitudinal displacement output structure. Figure 5 Model a 1 / 4 section of the metal circular tube 100 with a concave bending shell 101 on the right.

[0073] like Figure 6 As shown, Figure 6 The first-order frequency of the longitudinal displacement output structure on the left is 15198Hz. Figure 6 The second-order frequency of the longitudinal displacement output structure on the right is 28786Hz.

[0074] like Figure 7 As shown, Figure 7 The left image shows the radial vibration mode diagram of the metal tube 100 with a concave bending shell 101, with a radial frequency of 15446 Hz. When the longitudinal displacement output structure excites the radial vibration of the metal tube 100 in half-wavelength mode, the ultrasonic transducer is in low-frequency mode. At this time, the radial vibration of the metal tube 100 causes the concave bending shell 101 to produce bending vibration. The radial vibration displacement of the metal tube 100 is amplified by the concave bending shell 101, resulting in a larger axial displacement ΔS. A It is 0.107796e - 8 m, displacement ΔS R It is 0.520499e -10 m, satisfying ΔS A >ΔS R When the metal tube 100 expands and contracts radially, the bending and amplifying mechanism expands and contracts in phase. The radiated sound pressure of the metal tube 100 and the concave bending shell 101 in the sound field is superimposed in phase, thereby realizing the in-phase high-power radiation of the metal tube 100 and the concave bending shell 101.

[0075] Figure 7 The right side shows the axial vibration mode diagram of the metal tube 100 with the concave bending shell 101, with an axial frequency of 28898Hz. When the full-wavelength mode of the longitudinal displacement output structure excites the axial vibration of the metal tube 100, the ultrasonic transducer is in high-frequency mode. The concave bending shell 101 serves as the acoustic radiation surface for the axial vibration of the metal tube 100, increasing the end face radiation area of ​​the axial vibration of the metal tube 100 and improving the acoustic radiation efficiency of the ultrasonic transducer. This allows the ultrasonic transducer to achieve high-power radiation in both operating modes.

[0076] 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" in the above description indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0077] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0078] In the embodiments of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0079] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0081] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

Claims

1. A dual-frequency high-power liquid processing ultrasonic transducer comprising a sandwich transducer, a horn and a metal pipe, characterized in that: the horn is connected with the piezoelectric ceramic crystal in the longitudinal direction and is composed of a stepped horn composed of a conical part and a cylindrical part, one end of the horn is connected with the sandwich transducer to form a longitudinal displacement output structure; the side of the metal pipe is provided with a mounting hole, the mounting hole connects the metal pipe with the horn through a connecting piece arranged on the top surface of the conical part of the horn, both ends of the metal pipe are provided with a concave flexural shell, and the concave part of the concave flexural shell is arranged in the metal pipe; wherein the half-wave mode of the longitudinal displacement output structure makes the metal pipe produce radial vibration, the full-wave mode of the longitudinal displacement output structure makes the metal pipe produce axial vibration, forming a dual-frequency working mode of the ultrasonic transducer; when the half-wave mode of the longitudinal displacement output structure excites the radial vibration of the metal pipe, the ultrasonic transducer is in a low-frequency mode, the radial vibration of the metal pipe drives the concave flexural shell to produce flexural vibration, the concave flexural shell vibrates in phase, and the radiation sound pressure of the metal pipe and the concave flexural shell in the sound field is in phase and superimposed, realizing high-power radiation; when the full-wave mode of the longitudinal displacement output structure excites the axial vibration of the metal pipe, the ultrasonic transducer is in a high-frequency mode, the concave flexural shell serves as the sound radiation surface of the axial vibration of the metal pipe, increasing the end surface radiation area of the axial vibration of the metal pipe, and realizing high-power radiation. The sandwich transducer comprises a piezoelectric ceramic crystal stack, a metal block and a metal base, and the piezoelectric ceramic crystal stack, the metal block and the metal base are fixedly connected through stress bolts. The piezoelectric ceramic crystal stack is stacked by multiple PZT-4s. In the sandwich transducer, the radius of the metal base is 15.5mm-30.5mm, the height of the metal base is 2mm-32mm, the radius of the metal block is 15.5mm-30.5mm, and the height of the metal block is 3mm-33mm. In the horn, the radius of the cylindrical part is 15.5mm-30.5mm, the height of the cylindrical part is 15mm-30mm, the radius of the top surface of the conical part is 5mm-13mm, and the height of the conical part is 45mm-65mm. The inner diameter of the metal pipe is 33mm-45mm, the outer diameter of the metal pipe is 55mm-74mm, and the length of the metal pipe is 90mm-100mm.

2. The dual frequency high power liquid handling ultrasonic transducer of claim 1, wherein, The concave flexural shell is composed of a basin-shaped shell and a conical frustum, one end of the basin bottom of the basin-shaped shell is connected with one end of the large end surface of the conical frustum to form an integrated concave flexural shell, and the bottom of the basin-shaped shell and the conical frustum form the bottom of the concave flexural shell.

3. The dual frequency high power liquid handling ultrasonic transducer of claim 2, wherein, ​ 4. The dual frequency high power liquid handling ultrasonic transducer of claim 2, wherein, ​ 5. The dual frequency high power liquid handling ultrasonic transducer of claim 1, wherein, ​ 6. The dual frequency high power liquid handling ultrasonic transducer of claim 1, wherein, ​ 7. The dual frequency high power liquid handling ultrasonic transducer of claim 1, wherein, ​ 8. The dual frequency high power liquid handling ultrasonic transducer of claim 7, wherein, The bottom radius of the basin-shaped shell is 15mm-30mm, the small end radius of the circular truncated cone is 2mm-15mm, the depth of the basin-shaped shell is 4mm-10mm, the thickness of the bottom of the concave shell is 3mm-8mm, the side thickness of the basin-shaped shell is 2mm-5mm, and the basin thickness of the basin-shaped shell is 2mm-6mm.

9. The dual frequency high power liquid handling ultrasonic transducer of claim 1, wherein, The frequency of the half-wave mode is 14.5KHz-16KHz.

10. The dual frequency high power liquid handling ultrasonic transducer of claim 1, wherein, The frequency of the full-wave mode is 28KHz-30KHz.

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