CN111744755A - Novel ultrasonic bar - Google Patents
Novel ultrasonic bar Download PDFInfo
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- CN111744755A CN111744755A CN202010770685.3A CN202010770685A CN111744755A CN 111744755 A CN111744755 A CN 111744755A CN 202010770685 A CN202010770685 A CN 202010770685A CN 111744755 A CN111744755 A CN 111744755A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B3/02—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency involving a change of amplitude
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Abstract
The invention discloses a novel ultrasonic bar, which comprises an ultrasonic transducer, and the ultrasonic bar also comprises: a step-shaped amplitude changing device for amplifying longitudinal amplitude; slotting the circular tube to generate bending vibration of the tube wall; the stepped amplitude changing device and the slotted round pipe are sequentially arranged at the output end of the ultrasonic transducer. The invention adds a step amplitude changing device and a slotted round pipe on the basis of the transducer. According to the vibration theory, compared with the longitudinal vibration, under the same resonance frequency, for a vibrator with a large aspect ratio, the bending vibration of the vibrator generally works in a higher-order vibration mode, the number of wave crests in a unit length is more, the amplitude is larger, and therefore the volume deformation of a radiator is larger, the sound radiation efficiency is higher, and a radiation sound field is more uniform. In the field of liquid medium treatment such as water treatment, medicine extraction and sonochemical reaction, the product practicality is strong in the existing cylindrical ultrasonic transducer, and the structure is simple, and the manufacturing process difficulty is lower.
Description
Technical Field
The invention relates to the technical field of ultrasonic transducer application, in particular to a longitudinal bending vibration mode conversion ultrasonic rod.
Background
The high-power ultrasonic transducer has wide application prospect in the fields of ultrasonic cleaning, organic wastewater degradation, medicine extraction and the like. As a liquid ultrasonic treatment transducer, on the one hand, a large power capacity is required; on the other hand, as large a volume deformation as possible is required to improve the sound radiation efficiency; in addition, a radiation sound field which is as uniform as possible is required to increase the effect of the ultrasound effect.
In the prior art, the patent number is ZL 200520075667.4, the utility model patent of "high-power ultrasonic transducer" is formed by sleeving a multistage radial polarization piezoelectric ceramic round tube in a longer metal round tube, and the transducer can obtain a more uniform radiation sound field in the radius direction of the round tube. The defects that the piezoelectric ceramic circular tube in the transducer is polarized in the radial direction, the transverse electromechanical coupling coefficient k31 is small, and the electromechanical conversion efficiency of the transducer is low; in addition, the metal circular tube shell of the transducer is of a double-layer structure, and the middle is filled with oil. Due to the fact that the difference between acoustic impedance differences of oil and metal is large, large sound transmission attenuation exists inside the transducer, and radiation efficiency of the transducer is reduced.
The patent No. ZL 200520057492.4, entitled "ultrasonic bar for tank washing", implements radial vibration and radiation by bonding a series of longitudinal vibration transducers to the inner wall of a circular or polygonal section pipe. The ultrasonic rod is internally driven by a group of longitudinal composite transducers, and the power capacity can be larger. But for the low-frequency ultrasonic rod, the diameter of the low-frequency ultrasonic rod is larger, and the equipment is heavier; in addition, the transducer is required to have high water tightness.
The patent number is ZL 200910102269.X, and the invention patent named as a high-power ultrasonic composite tube is formed by axially connecting a group of piezoelectric transducers of the short composite tube in series. The inside of the energy converter adopts a cylindrical piezoelectric ceramic crystal stack ring group, and the metal elastic account sleeve inside is cooperated with an external metal round pipe to apply enough radial prestress to the cylindrical piezoelectric ceramic crystal stack ring group in the middle so as to improve the power capacity of the energy converter. The composite tube transducer has the advantages of high power density, high electromechanical conversion efficiency and good distribution uniformity of a radial radiation sound field. However, the structure of the transducer is complex, the process requirement is high, and particularly, the magnitude of prestress generated by each elastic account sleeve in the transducer is difficult to control, so that the consistency of the resonant frequency of each transducer unit in the transducer is difficult to control; furthermore, the transducer also has a high requirement for water tightness.
In addition, a sandwich type transducer is mainly adopted to excite a long metal rod with a stepped disk, and longitudinal vibration of the transducer is converted into radial vibration of the long metal rod through the Poisson effect. The cylindrical transducer is driven by the sandwich type longitudinal piezoelectric transducer, so that the power capacity is large, but the longitudinal wave velocity is large, and the vibration has obvious standing wave characteristics along the length direction of the rod, so that the radiation sound field is large in nonuniformity.
Disclosure of Invention
In view of the above, in order to solve the above problems, a primary object of the present invention is to provide a novel ultrasonic bar capable of generating bending vibration, which has a larger number of peaks per unit length, a larger amplitude, and a higher sound radiation efficiency than the conventional longitudinal vibration at the same resonance frequency.
Another object of the present invention is to provide a novel ultrasonic bar, wherein the ultrasonic bar is provided with a slotted circular tube and an amplitude varying device independently outside an ultrasonic transducer, and the longitudinal vibration of the ultrasonic transducer and the amplitude varying device is converted into the planar bending vibration of a slotted circular tube end cover connected with the ultrasonic transducer and the amplitude varying device through vibration mode conversion, so that the wall of the slotted circular tube generates the transverse bending vibration to realize more uniform sound radiation, and meanwhile, a high-intensity line focusing sound field can be formed inside the slotted circular tube.
It is yet another object of the present invention to provide a novel ultrasonic wand which is capable of having a larger displacement amplitude and volume deformation, greatly improving the efficiency of acoustic radiation.
In order to achieve the purpose, the invention provides the following technical scheme:
a novel ultrasonic bar comprises an ultrasonic transducer, and is characterized in that the ultrasonic bar further comprises:
a step-shaped amplitude changing device for amplifying longitudinal amplitude;
the slotted round pipe can generate bending vibration of the pipe wall;
the stepped amplitude changing device and the slotted round pipe are sequentially arranged at the output end of the ultrasonic transducer.
The invention adds a step amplitude-changing device and a slotted round pipe on the basis of the transducer, the step amplitude-changing device can be used as an impedance matcher of the transducer to amplify the output amplitude of a front cover plate of the transducer, the slotted round pipe generates pipe wall bending vibration, and the bending vibration is transmitted to a rear cover plate of the slotted round pipe through a step transition section to realize longitudinal-bending vibration mode conversion. Compared with a single longitudinal vibration mode transducer, under the same resonance frequency, the bending vibration radiator with the same size usually works in a high-order vibration mode, the number of wave crests in a unit length is larger, the amplitude is larger, and therefore the volume change of the radiator is large, the radiation efficiency is higher, and the radiation sound field is more uniform.
Further, the total length of the ultrasonic transducer is a half wavelength, and the length of the stepped amplitude changing device is a half wavelength.
Furthermore, the length of the slotted circular tube is half of the bending vibration wavelength of the tube wall or integral multiple of half of the bending vibration wavelength of the tube wall, and the slotted circular tube can be used as an impedance matching combination to improve the radiation efficiency of the transducer.
Further, the step-shaped amplitude-changing device comprises an arc transition section and a step-shaped amplitude-changing rod; the stepped amplitude transformer is arranged at the output end of the ultrasonic transducer, and the arc transition section is connected between the stepped amplitude transformer and the slotted circular tube.
Furthermore, the lower part of the step-type amplitude transformer is of a reducing rod-shaped structure, meanwhile, the arc-shaped transition section is tightly connected with the reducing rod-shaped structure, and the transition arc plays a role in reducing stress concentration.
Furthermore, the arc transition section and the stepped amplitude transformer are integrally manufactured and formed, and the stepped amplitude transformer can be any one of a conical amplitude transformer, an exponential amplitude transformer or an energy-gathering amplitude transformer.
The ultrasonic transducer comprises a piezoelectric ceramic vibrator component, a negative electrode lead, a positive electrode lead, a transducer front cover plate and a transducer rear cover plate, wherein the piezoelectric ceramic vibrator component is driven longitudinally; the transducer front cover plate, the transducer rear cover plate and the ultrasonic transducer are respectively provided with an axial concentric hole and are tightly connected by screwing a prestressed bolt in the axial concentric holes; a rear end cover of the slotted circular pipe and a front end cover of the slotted circular pipe are arranged at two ends of the slotted circular pipe, an arc transition section is arranged between the rear end cover of the slotted circular pipe and the stepped amplitude transformer, and straight slits with the same size are uniformly distributed along the periphery of the wall on the pipe wall of the slotted circular pipe; the transducer front cover plate, the stepped amplitude transformer, the arc transition section and the slotted circular tube rear end cover are tightly matched through connecting bolts.
Further, the driving vibrator in the ultrasonic transducer is not limited to the piezoelectric ceramic vibrator assembly, and may be a magnetostrictive transducer.
Furthermore, the transducer front cover plate is made of aluminum or titanium alloy, the transducer rear cover plate is made of steel, aluminum or titanium alloy, and the piezoelectric ceramic vibrator assembly is made of PZT series materials.
Further, the number of the piezoelectric ceramic vibrator assemblies is even.
Furthermore, the piezoelectric ceramic vibrator assembly comprises a positive electrode lead and two negative electrode leads, and the materials of the positive electrode lead and the negative electrode lead are thin copper sheets or silver-plated metal sheets.
The slotted pipe can generate sound radiation inside and outside the pipe; the high-intensity line focusing sound field can be formed in the slotted circular tube, at least two straight slits which are arranged in parallel and equal in length are symmetrically formed in the wall of the slotted circular tube, the straight slits are distributed along the longitudinal direction of the slotted circular tube, and the length of the straight strip of the cambered surface between every two adjacent straight slits meets the integral multiple of the half wavelength of high-order bending vibration.
Furthermore, a plurality of straight slits with the same size are uniformly distributed on the side wall of the slotted circular tube along the axis, and the length of the straight slits does not exceed the length of the circular tube. The slotted circular tube can change the resonance frequency of the radiation head by adjusting the width and the number of the straight slots, so that the same-frequency resonance with the ultrasonic transducer is realized.
Furthermore, the end of the straight seam of the slotted round pipe has a certain distance with the end of the slotted round pipe.
Further, the slotted round pipe is provided with at least one end cover, and the end cover is fixed on the slotted round pipe or integrally formed with the slotted round pipe.
Furthermore, the end surface radius of the end cover of the slotted circular tube is not less than the radius of the front end radiation surface of the arc transition section connected with the end cover, so that the end cover generates plane bending vibration and the plane bending vibration is converted into transverse bending vibration of the tube wall of the slotted circular tube. The end cover of the slotted pipe end connected with the amplitude transformer and the slotted round pipe can be arranged separately or integrated, and the end cover can be arranged at the other end of the slotted round pipe or not.
Still further, the end cap ports may vary in shape, including but not limited to cylindrical, hemispherical, conical, cup-shaped.
Furthermore, the material of the slotted round pipe is one of aluminum alloy, titanium alloy or stainless steel.
Furthermore, the slotted round pipe is tightly connected with the stepped amplitude transformer through a connecting bolt.
Compared with the prior art, the invention has the beneficial effects that:
according to the ultrasonic bar, the stepped amplitude transformer is used as an impedance matcher of the transducer to amplify the output amplitude of the front cover plate of the transducer, the slotted circular tube is coupled with the front cover plate of the oscillator under the transition of the stepped amplitude transformer, and the longitudinal vibration of the transducer is converted into the bending vibration of the tube wall of the slotted circular tube. Especially for the circular tube slot, its advantage lies in: (1) the bending vibration of the pipe wall is realized, the volume deformation is larger, the radiation efficiency is higher, and the radiation sound field is more uniform; (2) and forming a high-intensity focused sound field in the tube to enhance the ultrasonic treatment effect.
Because the wave velocity of the bending vibration wave has dispersion characteristics, the wave velocity of the bending vibration wave can be far smaller than the wave velocity of the longitudinal wave by design. Therefore, under the same frequency condition, the wavelength of the bending wave is shorter, the more dense the wave peaks appearing in the same size, the bending vibration order of the same rod is higher than the longitudinal vibration order of the same rod, and correspondingly, the radiation sound field along the length direction of the rod is more uniform.
The utility model has the advantages of can more effectual improvement sound field homogeneity and job stabilization nature when normal during operation, especially in liquid medium processing fields such as water processing, drug composition extraction and sonochemistry reaction, the product practicality is strong in current cylindricality ultrasonic transducer, and simple structure, and the manufacturing process degree of difficulty is lower, has fine application prospect.
In addition, because the curved wave crest quantity of the pipe wall of the slotted round pipe is more, and the slotted round pipe has larger displacement amplitude and volume deformation, the sound radiation efficiency of the transducer can be greatly improved.
Drawings
Fig. 1 is a schematic perspective view of the novel ultrasonic bar of the present invention.
Fig. 2 is an axial cross-sectional view of the novel ultrasonic bar slotted round tube of the present invention.
Fig. 3 is a schematic view of the vibration mode of a non-slotted round tube driven by the composite piezoelectric transducer of the present invention.
Fig. 4 is a schematic view of the vibration mode of the composite piezoelectric transducer driving the lower slotted round tube.
In the figure: 1. a prestressed bolt; 2. a transducer back cover plate; 3. a negative electrode lead; 4. a piezoelectric ceramic vibrator assembly; 5. a positive electrode lead; 6. a transducer front cover plate; 7. an ultrasonic transducer; 8. a stepped horn; 9. an arc transition section; 10. slotting circular tube rear end cover; 11. straight sewing; 12. slotting a circular tube; 13. and (4) slotting a circular tube front end cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1-2 show a novel ultrasonic bar according to the present invention, which includes a slotted circular tube 12, an arc-shaped transition section 9, a stepped horn 8, and an ultrasonic transducer 7 disposed at the front end of the stepped horn 8. The ultrasonic transducer 7 comprises a piezoelectric ceramic vibrator component 4, a negative electrode lead 3, a positive electrode lead 5, a transducer front cover plate 6 and a transducer rear cover plate 2, wherein the piezoelectric ceramic vibrator component 4 is driven longitudinally, and the transducer front cover plate and the transducer rear cover plate are respectively arranged at two ends of the ultrasonic transducer 7; the transducer front cover plate 6, the transducer rear cover plate 2 and the ultrasonic transducer 7 are respectively provided with an axial concentric hole, and are tightly connected by screwing the prestressed bolt 1 into the axial concentric holes.
The transducer front cover plate 6, the stepped amplitude transformer 8, the arc transition section 9 and the slotted circular tube rear end cover 10 are tightly matched through connecting bolts.
The upper part of the step-type amplitude transformer 8 and the front cover plate 6 of the transducer have the same diameter and are tightly connected together, the lower part of the step-type amplitude transformer 8 is contracted into a reducing rod-shaped structure, and the arc transition section 9 is tightly connected with the reducing rod-shaped structure, so that the stress concentration is reduced.
It should be noted that: the arc transition section 9 and the step-shaped amplitude transformer 8 are integrally manufactured and formed, and cannot be installed in sections. In other implementations, the stepped horn 8 may also be one of a conical horn, an exponential horn, or an energy-concentrating horn.
The stepped amplitude transformer 8 serving as an impedance matcher of the ultrasonic transducer 7 can amplify the output amplitude of the front cover plate 6 of the transducer, and the output amplitude is transmitted to the rear end cover 10 of the slotted circular tube through the arc transition section 9 to realize longitudinal bending vibration mode conversion.
The lower part of the arc transition section 9 is fixed with the rear end cover 10 of the slotted circular tube.
A slotted circular tube rear end cover 10 and a slotted circular tube front end cover 13 are arranged at two ends of the slotted circular tube 12, an arc transition section 9 is arranged between the slotted circular tube rear end cover 10 and the stepped amplitude transformer 8, and it is noted that the slotted circular tube rear end cover 10 and the slotted circular tube 12 connected with the amplitude transformer can be integrated or can be separately arranged; in other implementations, the slotted round tube front end cap 13 may not be provided and does not affect the normal operation of the slotted round tube 12. When the front end cover 13 of the slotted round pipe is arranged, the front end cover 13 of the slotted round pipe is fixed at the tail end of the slotted round pipe 12 through a lateral stress bolt, or the front end cover and the slotted round pipe are directly fixed through a metal welding method.
For a slotted round tube 12, the tube length should meet one-half or an integer multiple of one-half of the tube wall bend wavelength.
The slotted round pipe can generate sound radiation inside and outside the pipe; the inside of the slotted round tube can form a high-intensity line focusing sound field. A plurality of straight slits 11 which are same in size and are arranged in parallel are uniformly distributed on the side wall of the slotted circular tube along the axial direction, and the length of each straight slit does not exceed the length of the circular tube. The end of the straight seam of the slotted round tube has a certain distance with the end of the slotted round tube. The resonance frequency of the radiation head can be changed by adjusting the width and the number of the straight slits 11, so that the same-frequency resonance with the ultrasonic transducer is realized. Under the working state, a rod which does pure bending motion can be seen between any two straight seams 11, and the two-way sound radiation outside and inside the pipe can be realized, thereby improving the energy radiation efficiency.
The straight slits 11 are mirror images along the axial center plane of the slotted round tube 12. And the length of the straight strip of the cambered surface between the two adjacent straight seams meets the integral multiple of the half wavelength of the high-order bending vibration.
For the ultrasonic transducer 7, two adjacent elements in the piezoelectric ceramic vibrator component 4 are opposite in the same pole, and a thin copper sheet is clamped in the middle to be used as an electrode lead end of the ultrasonic transducer 7; the contact surface of the piezoelectric ceramic vibrator component 4 and the lower end of the transducer back cover plate 2 is a negative electrode, and a thin copper sheet is clamped in the negative electrode to be used as a first negative electrode lead end of the ultrasonic transducer 7; the negative electrode surface of the other one of the piezoelectric ceramic vibrator components 4 is the equal number division surface of the piezoelectric ceramic vibrator components 4, and a thin copper sheet is clamped in the middle to be used as a second negative electrode lead end of the ultrasonic transducer 7; thin copper sheets are also clamped at the opposite positions of the positive electrodes of two elements in the piezoelectric ceramic vibrator component 4 and are respectively used as a first positive electrode lead end and a second positive electrode lead end of the ultrasonic transducer 7; the positive electrode lead 5 is connected with a first positive electrode lead end and a second positive electrode lead end of the ultrasonic transducer 7; the negative electrode lead 3 is connected to both a first negative lead terminal and a second negative lead terminal of the ultrasonic transducer 7. The number of the piezoelectric ceramic vibrator units 4 is even. The piezoelectric ceramic vibrator assembly 4 comprises a positive electrode lead 5 and two negative electrode leads 3, and the materials of the positive electrode lead 5 and the negative electrode lead 3 are thin copper sheets or silver-plated metal sheets.
The diameters of the axial concentric holes at the front ends of the transducer front cover plate 6, the transducer rear cover plate 2, the piezoelectric ceramic vibrator assembly 4 and the slotted circular tube 12 are consistent. The transducer front cover plate 6 is made of aluminum, the transducer rear cover plate 2 is made of No. 45 steel, and the piezoelectric ceramic vibrator assembly 4 is made of PZT series materials.
In other implementations, the driving vibrator in the ultrasonic transducer 7 is not limited to the piezoelectric ceramic vibrator assembly 4, and may be a magnetostrictive transducer.
In order to better realize the longitudinal-bending vibration mode conversion, the total length of the ultrasonic transducer 7 is half wavelength, the length of the stepped amplitude transformer 8 is half wavelength, and the length of the slotted circular tube 12 is half of the bending vibration wavelength of the tube wall or integral multiple of half of the bending vibration wavelength of the tube wall.
A high-strength line focusing sound field can be formed in the slotted circular tube 12, a straight slot 11 formed in the wall of the slotted circular tube 12 meets the integral multiple of half-wavelength of high-order bending vibration, and under the matching of the arc transition section 9 and the slotted circular tube rear end cover 10, the conversion of a longitudinal bending vibration mode of the transducer can be realized, the uniformity of the sound field is improved, and the sound radiation efficiency is improved.
The slotted round pipe 12 is connected with the slotted round pipe rear end cover 10 in a split or integrated mode, and the slotted round pipe front end cover 13 is selectively covered. When the end cover is not installed on the slotted round pipe, the slotted end of the straight slot has a certain distance with the pipe orifice.
The end surface radius of the rear end cover 10 of the slotted circular tube is not less than the radius of the front end radiation surface of the arc transition section 9. So that the end cover generates plane bending vibration and converts the plane bending vibration into transverse bending vibration of the pipe wall of the slotted circular pipe.
The material of the body of the slotted round tube 12 is one of aluminum alloy, titanium alloy or stainless steel. The slotted circular pipe is tightly and fixedly connected with the stepped amplitude transformer through the connecting bolt. It should be noted that the slotted circular tube is not connected with the front cover plate of the transducer by means of internal threads, so that the phenomenon of 'knot shedding' is avoided.
The shape of the end of the slotted tubular rear end cap 10 can be varied, including but not limited to cylindrical, hemispherical, conical, or cup-shaped.
Referring to fig. 3-4, by controlling the variable of whether to perform slotting, the vibration modes and the amplitude distributions of the two seamless round pipes and the slotted round pipe 12 with the same size are controlled by the same driving device:
as shown in fig. 3, which is a schematic view of the vibration mode of the circular tube that is not slit and driven by the ultrasonic transducer 7 shown in fig. 1, it can be seen from fig. 3 that, in the non-slit state, the tube body of the metal circular tube exhibits a longitudinal-radial coupled vibration mode, the number of peaks on the tube body is small, and the relative amplitudes of the peaks and the troughs are small (maximum 3.21 × 10-9m, minimum 2.17 × 10-9 m), which indicates that the non-uniformity of the radiation sound field of the metal circular tube is high.
Fig. 4 is a schematic view of the vibration mode of the slotted round tube 12 of fig. 3 with the same size driven by the ultrasonic transducer 7 shown in fig. 1, and it can be seen from fig. 4 that in the slotted state, the tube body of the metal round tube exhibits a bending vibration mode, the bending vibration has a shorter wavelength compared to the longitudinal vibration, when the tube body parameters are consistent, the bending vibration has a larger number of peaks and a denser density, and the relative amplitude of the peaks and valleys is larger (the maximum vibration amplitude during the slotting is 5.36 × 10-9 m).
In a word, the novel ultrasonic rod is simple in manufacturing process, can realize 360-degree omnidirectional ultrasonic radiation, greatly improves the sound radiation efficiency and the uniformity of sound field distribution, is suitable for the field of high-efficiency treatment of liquid media such as water and the like, and meets the application requirements of industrial enterprises on ultrasonic transducers.
Water body treatment usually consumes chemical treatment reagents in large quantities, so that the water body treatment not only easily causes secondary pollution to the environment, but also is not beneficial to responding to the central call for green innovation development. According to the novel ultrasonic bar provided by the invention, the slotted circular tube is coupled with the front cover plate of the vibrator under the transition of the stepped amplitude transformer, and the longitudinal vibration of the transducer is converted into the bending vibration of the slotted circular tube. Compared with longitudinal vibration, the wavelength generated by bending vibration is shorter, more vibration wave crests appear on the metal pipe body, and the better sound field uniformity can effectively improve the radiation sound field range and the high-power working stability during normal working. In the field of water body treatment, the product practicability is higher than that of a common column amplitude transformer, the structure is simple, the manufacturing process difficulty is lower, the application prospect is very wide, and a new solution is provided for the water body treatment problem.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (13)
1. A novel ultrasonic bar comprises an ultrasonic transducer, and is characterized in that the ultrasonic bar further comprises:
a step-shaped amplitude changing device for amplifying longitudinal amplitude;
slotting the circular tube to generate bending vibration of the tube wall;
the stepped amplitude changing device and the slotted round pipe are sequentially arranged at the output end of the ultrasonic transducer.
2. The novel ultrasonic wand of claim 1, wherein the total length of the ultrasonic transducer is a half wavelength and the stepped horn is a half wavelength.
3. The novel ultrasonic wand of claim 2, wherein the length of the slotted round tube is one-half or an integral multiple of one-half of the bending vibration wavelength of the tube wall, and the slotted round tube can be used as an impedance matching combination to improve the radiation efficiency of the transducer.
4. A novel ultrasonic rod as defined in claim 1 in which said stepped horn means comprises an arcuate transition section, a stepped horn; the stepped amplitude transformer is arranged at the output end of the ultrasonic transducer, and the arc transition section is connected between the stepped amplitude transformer and the slotted circular tube.
5. The novel ultrasonic rod of claim 4 wherein the lower portion of the stepped horn is a reduced diameter rod-like structure and the arcuate transition section is in close engagement with the reduced diameter rod-like structure, the transition arc serving to reduce stress concentration.
6. The novel ultrasonic bar of claim 5 wherein the curved transition section and the stepped horn are integrally formed, and the stepped horn is any one of a conical horn, an exponential horn or an energy-variable horn.
7. The novel ultrasonic bar according to claim 1, wherein the ultrasonic transducer comprises a piezoelectric ceramic vibrator assembly driven longitudinally, a negative electrode lead, a positive electrode lead, and a transducer front cover plate and a transducer back cover plate respectively arranged at two ends of the ultrasonic transducer; the transducer front cover plate, the transducer rear cover plate and the ultrasonic transducer are respectively provided with an axial concentric hole and are tightly connected by screwing a prestressed bolt in the axial concentric holes; a rear end cover of the slotted circular pipe and a front end cover of the slotted circular pipe are arranged at two ends of the slotted circular pipe, an arc transition section is arranged between the rear end cover of the slotted circular pipe and the stepped amplitude transformer, and straight slits with the same size are uniformly distributed along the periphery of the wall on the pipe wall of the slotted circular pipe; the transducer front cover plate, the stepped amplitude transformer, the arc transition section and the slotted circular tube rear end cover are tightly matched through connecting bolts.
8. The novel ultrasonic rod of claim 7, wherein the number of the piezoelectric ceramic vibrator assemblies is an even number of pieces; the piezoelectric ceramic vibrator component comprises a positive electrode lead and two negative electrode leads, wherein the positive electrode lead and the negative electrode leads are made of thin copper sheets or silver-plated metal sheets.
9. The novel ultrasonic rod according to claim 1, wherein the slotted pipe has a circular pipe capable of radiating sound waves into and out of the pipe, and the circular pipe has a high-intensity line-focused sound field inside, the pipe wall of the slotted pipe is symmetrically provided with at least two straight slits arranged in parallel and equal in length, the straight slits are distributed along the longitudinal direction of the slotted pipe, and the length of the straight arc-shaped bar between two adjacent straight slits satisfies an integral multiple of half-wavelength of high-order bending vibration.
10. The novel ultrasonic probe according to claim 9, wherein a plurality of straight slits with the same size are uniformly distributed on the side wall of the slotted round tube along the axial direction, and the length of the straight slits does not exceed the length of the round tube; the straight seam end of the slotted round pipe and the end part of the slotted round pipe have a certain distance.
11. The novel ultrasonic wand of claim 10 wherein the slotted round tube has at least one end cap that is affixed to or integrally formed with the slotted round tube.
12. The novel ultrasonic wand of claim 11, wherein the radius of the end face of the end cap of the slotted round tube is not smaller than the radius of the front radiation face of the arc-shaped transition section connected with the end cap, so that the end cap generates plane bending vibration and converts the plane bending vibration into transverse bending vibration of the wall of the slotted round tube.
13. The novel ultrasonic wand of claim 12, wherein the end cap port shape includes but is not limited to cylindrical, hemispherical, conical, cup-shaped.
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| CN202010770685.3A CN111744755A (en) | 2020-08-04 | 2020-08-04 | Novel ultrasonic bar |
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| CN202010770685.3A CN111744755A (en) | 2020-08-04 | 2020-08-04 | Novel ultrasonic bar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113331912A (en) * | 2021-07-20 | 2021-09-03 | 昆明理工大学 | Vibration actuator for removing cerebral thrombosis and thrombus removing equipment |
| CN113663980A (en) * | 2021-08-20 | 2021-11-19 | 陕西师范大学 | Ultrasonic transducer, ultrasonic cleaning device and cleaning method capable of vibrating in multiple directions |
| CN113843132A (en) * | 2021-08-20 | 2021-12-28 | 湖北信安通科技有限责任公司 | Piezoelectric transducer combined with axial bending and transverse vibration and cleaning device and method |
| CN114733740A (en) * | 2022-05-17 | 2022-07-12 | 中国科学院宁波材料技术与工程研究所 | Modular high-power ultrasonic transducer |
-
2020
- 2020-08-04 CN CN202010770685.3A patent/CN111744755A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113331912A (en) * | 2021-07-20 | 2021-09-03 | 昆明理工大学 | Vibration actuator for removing cerebral thrombosis and thrombus removing equipment |
| CN113663980A (en) * | 2021-08-20 | 2021-11-19 | 陕西师范大学 | Ultrasonic transducer, ultrasonic cleaning device and cleaning method capable of vibrating in multiple directions |
| CN113843132A (en) * | 2021-08-20 | 2021-12-28 | 湖北信安通科技有限责任公司 | Piezoelectric transducer combined with axial bending and transverse vibration and cleaning device and method |
| CN114733740A (en) * | 2022-05-17 | 2022-07-12 | 中国科学院宁波材料技术与工程研究所 | Modular high-power ultrasonic transducer |
| CN114733740B (en) * | 2022-05-17 | 2023-08-08 | 中国科学院宁波材料技术与工程研究所 | Modularized high-power ultrasonic transducer |
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