CN211678638U - Claw type ultrasonic transducer - Google Patents
Claw type ultrasonic transducer Download PDFInfo
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- CN211678638U CN211678638U CN202020101150.2U CN202020101150U CN211678638U CN 211678638 U CN211678638 U CN 211678638U CN 202020101150 U CN202020101150 U CN 202020101150U CN 211678638 U CN211678638 U CN 211678638U
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- amplitude transformer
- shape
- electrode lead
- ultrasonic transducer
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Abstract
The utility model discloses a claw formula ultrasonic transducer, including sandwich type piezoelectricity ultrasonic transducer, amplitude transformer and claw formula omnidirectional radiator, amplitude transformer's one end and sandwich type piezoelectricity ultrasonic transducer fixed connection, amplitude transformer's the other end and claw formula omnidirectional radiator fixed connection, sandwich type piezoelectricity ultrasonic transducer includes back shroud, piezoceramics brilliant heap and front shroud, back shroud, piezoceramics brilliant heap and front shroud pass through stress bolt fastening together, claw formula omnidirectional radiator includes the claw end and the claw indicates, the one end and amplitude transformer fixed connection of claw end, claw indicates the other end of fixed connection at the claw end, the claw end is open type structure, the claw indicates to be provided with many, claw indicates along the circumference evenly distributed of claw end; the high-frequency high-power acoustic radiation device can realize 360-degree omnidirectional acoustic radiation through a high-order bending vibration mode while realizing high-frequency high power, so that the acoustic radiation efficiency and the acoustic field action range can be improved, and the uniformity of a radiation acoustic field can be improved.
Description
Technical Field
The utility model belongs to the technical field of ultrasonic transducer, concretely relates to claw formula ultrasonic transducer.
Background
The function of an ultrasonic transducer is to convert input electric power into mechanical power (i.e., ultrasonic waves) and transmit the mechanical power, and a small part of the power is consumed by the ultrasonic transducer. In the technical fields of high-power ultrasonic application such as ultrasonic cleaning, ultrasonic drug extraction, ultrasonic bio-fuel oil equipment, crude oil viscosity reduction, ultrasonic sewage treatment, sonochemical reaction and the like, the uniformity of an ultrasonic radiation sound field is always regarded as important in the industry. In particular, for ultrasonic treatment transducers for liquid media, in addition to a high acoustic power, a large volume deformation is required to increase the ultrasonic energy radiation efficiency and a radiated sound field as uniform as possible to increase the ultrasonic treatment effect. The realization of high power, high efficiency and uniform radiation sound field distribution is always the goal pursued in the industry.
The traditional longitudinal and bending composite mode ultrasonic transducer driven by complex frequency mainly has the following problems: 1. the power supply matching is difficult due to different electromechanical parameters under the common frequency of multiple vibration modes; 2. the stress and vibration speed distribution under various vibration modes are different, the displacement node positions are different, and the mechanical fixation is difficult; 3. there is mutual coupling between the various vibration modes. The existing rod-shaped and tube-shaped liquid processing ultrasonic transducer can realize stronger radiation sound power by mode conversion between longitudinal vibration or longitudinal-radial vibration and is widely applied, but the working principle of the rod-shaped and tube-shaped ultrasonic transducer is that longitudinal excitation is carried out on a rod or a tube to generate radial sound radiation, the longitudinal wave speed in the rod or the tube is higher, so the longitudinal wave wavelength is longer, a radiation sound field has larger nonuniformity along the length direction of the rod or the tube, and larger standing wave characteristics exist.
The patent with the application number of CN200520075667.4 entitled "high-power ultrasonic transducer" discloses a high-power transducer capable of generating radial vibration in the circumferential direction, which has a relatively comprehensive radiation range, but the rigidity of the assembled structure is far less than that of an integrated structure, which means that the power of the transducer will be limited, and the problem of low uniformity of the radiation sound field also exists; the patent with the application number of CN201711137711.3 named as a high-power ultrasonic transducer with controllable sound field discloses a transducer system for realizing the controllable focusing sound field through a signal delay system and multi-channel power amplification, the principle is that the dynamic regulation and control of the sound field of a tubular transducer are realized by changing the phase difference of excitation signals, and a signal delay system, a multi-channel power amplifier, a linear array composite driving system and the like are needed, so the power supply integration difficulty is higher; the application number is CN201610777589.5 entitled "a rod type transducer for generating multi-dimensional ultrasonic wave in water", and discloses a tube-rod combined ultrasonic transducer for longitudinal-radial vibration mode conversion, which can realize high-power sound amplitude to a certain extent, but cannot meet the requirement of high-efficiency application because of single sound radiation direction and further improved sound field uniformity.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a claw formula ultrasonic transducer's technical scheme to the not enough of prior art existence, when realizing high frequency high power, realize 360 all-round acoustic radiation through the bending vibration mode of high order, can improve acoustic radiation efficiency and sound field scope of action, can improve the homogeneity of radiation sound field again to can improve the treatment effeciency in supersound liquid fields such as supersound sewage treatment, supersound medicine extraction, supersound biofuel preparation, ultrasonic cleaning by a wide margin.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a claw-type ultrasonic transducer, characterized by: the sandwich type piezoelectric ultrasonic transducer comprises a sandwich type piezoelectric ultrasonic transducer, an amplitude transformer and a claw type omnidirectional radiator, wherein one end of the amplitude transformer is fixedly connected with the sandwich type piezoelectric ultrasonic transducer, the other end of the amplitude transformer is fixedly connected with the claw type omnidirectional radiator, the sandwich type piezoelectric ultrasonic transducer comprises a rear cover plate, a piezoelectric ceramic crystal stack and a front cover plate, the rear cover plate, the piezoelectric ceramic crystal stack and the front cover plate are fixed together through stress bolts, the claw type omnidirectional radiator comprises a claw bottom and claw fingers, one end of the claw bottom is fixedly connected with the amplitude transformer, the claw fingers are fixedly connected to the other end of the claw bottom, the claw bottom is of an open structure, a plurality of claw fingers are arranged, the claw fingers are uniformly distributed along the circumferential direction of the claw bottom, and the resonance frequency is changed by changing the thickness, the width and the length of the claw fingers; the amplitude transformer is a metal rod-shaped energy collector, plays a role in amplitude amplification, can convert longitudinal vibration into bending vibration along the axial direction through the open design of the claw bottom, and realizes high displacement amplitude and high-order vibration of the claw fingers, so that a radiation sound field with high sound radiation efficiency and high uniformity is realized.
Under the same frequency condition, the wavelength of bending waves is shorter, the bending vibration order of the same claw finger is greatly higher than the longitudinal vibration order, so that the distance between the bending wave crests is far smaller than that between the longitudinal wave crests, correspondingly, the radiation sound field along the length direction of the claw finger is more uniform, in addition, as the bending wave number in the claw finger is more, the claw finger has larger displacement amplitude and volume deformation, the sound radiation efficiency is greatly improved, and each claw finger is discrete and is uniformly distributed along the circumferential direction of the claw bottom, the inward and outward omnidirectional radiation can be realized.
Further, the piezoelectric ceramic crystal stack is formed by stacking a plurality of piezoelectric ceramic crystal wafers polarized in thickness; is made of PZT series piezoelectric ceramic materials.
Furthermore, the piezoelectric ceramic wafers are of a circular ring-shaped structure, and the number of the piezoelectric ceramic wafers is even.
Further, annular electrode plates are clamped between every two adjacent piezoelectric ceramic wafers, between the piezoelectric ceramic wafers and the front cover plate and between the piezoelectric ceramic wafers and the rear cover plate and respectively serve as a positive electrode lead end and a negative electrode lead end, the positive electrode lead end and the negative electrode lead end are arranged alternately, the positive electrode lead end is connected with the positive electrode lead end, the negative electrode lead end is connected with the negative electrode lead end, and the positive electrode lead end and the negative electrode lead end are respectively in contact connection with the front cover plate and the rear cover plate through leads.
Furthermore, the section of the amplitude transformer is in one of a conical shape, an exponential shape, a step shape, a catenary shape or a Gaussian shape, a flange plate is arranged at the displacement amplitude joint surface of the amplitude transformer, and the flange plate is one of a threaded flange, a perforated flange or a skirt flange; the flange is used for mechanical fixation.
Further, one end of the amplitude transformer is provided with a screw hole, and the amplitude transformer is fixedly connected with the other amplitude transformer or the claw bottom through a screw rod; the amplitude transformer can be connected in multiple stages to realize the change of the total length of the amplitude transformer.
Furthermore, the shape of the bottom of the claw is one of a cross shape, a meter shape, a bowl shape, a disc shape or a cup shape, and the section of the claw is one of a square shape, a round shape, a trapezoid shape and a fan shape, and the section of the claw is a column with the same section or a column with variable section.
Furthermore, the claw fingers and the claw bottom are of an integrated structure or a split structure, and when the claw fingers and the claw bottom are of the split structure, the claw bottom and the claw fingers are fixedly connected through bolts.
Furthermore, the claw fingers and the claw bottom are processed by one or more of stainless steel, aluminum alloy and titanium alloy.
Further, the amplitude transformer is fixedly connected with the claw bottom through a high-strength screw rod, and the radiation area of the front end of the amplitude transformer is smaller than the area of the claw bottom; the condition that the radiation area of the front end of the amplitude transformer is smaller than the area of the claw bottom is that bending vibration is generated, so that the bending vibration of the claw bottom can drive the bending vibration of the claw fingers.
The utility model discloses owing to adopted above-mentioned technical scheme, following beneficial effect has:
the utility model discloses well amplitude transformer is the metal rod-like energy collector, play amplitude amplification effect, open type design through the claw bottom can convert longitudinal vibration into along axial bending vibration, realize the high displacement amplitude and the high-order vibration that the claw indicates, thereby realize the radiation sound field of the high homogeneity of high acoustic radiation efficiency, thickness through changing the claw indicates, width and length change its vibration frequency, realize with sandwich type piezoelectricity ultrasonic transducer's the same frequency resonance, sandwich type piezoelectricity ultrasonic transducer among the device can utilize the special construction of claw formula omnidirectional radiator to realize the conversion of vertical-crooked compound mode, this device claw indicates that displacement amplitude and vibration order that thickness reduction obtained are obviously higher than the traditional tubulose ultrasonic transducer of similar frequency, same length and pipe wall.
Under the same frequency condition, the wavelength of bending waves is shorter, the bending vibration order of the same claw finger is greatly higher than the longitudinal vibration order, so that the distance between the bending wave crests is far smaller than that between the longitudinal wave crests, correspondingly, the radiation sound field along the length direction of the claw finger is more uniform, in addition, as the bending wave number in the claw finger is more, the claw finger has larger displacement amplitude and volume deformation, the sound radiation efficiency is greatly improved, and each claw finger is discrete and is uniformly distributed along the circumferential direction of the claw bottom, the inward and outward omnidirectional radiation can be realized.
The utility model discloses in when realizing high frequency high power, realize 360 all-round acoustic radiation through the bending vibration mode of high order, can improve acoustic radiation efficiency and sound field effect scope, can improve the homogeneity of radiation sound field again to can improve the treatment effeciency in supersound liquid fields such as supersound sewage treatment, supersound medicine extraction, supersound biofuel preparation, ultrasonic cleaning by a wide margin.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
fig. 1 is a schematic structural diagram of a claw-type ultrasonic transducer according to the present invention;
FIG. 2 is a schematic view of the connection between the variable-amplitude rod and the claw-type omnidirectional radiator of the present invention
FIG. 3 is a vibration mode diagram of the middle finger of the present invention with a thickness of 10 mm;
FIG. 4 is a vibration mode diagram of the middle finger of the present invention with a thickness of 5 mm;
FIG. 5 is a vibration mode diagram of a conventional tubular ultrasonic transducer with a tube wall thickness of 10 mm;
fig. 6 is a vibration mode diagram of a conventional tubular ultrasonic transducer having a 5mm tube wall thickness.
In the figure: 1-sandwich piezoelectric ultrasonic transducer; 2-an amplitude transformer; 3-a claw omnidirectional radiator; 4-rear cover plate; 5-piezoelectric ceramic crystal stack; 6-front cover plate; 7-paw bottom; 8-paw finger; 9-piezoelectric ceramic wafer; 10-ring-shaped electrode slice; 11-positive electrode lead end; 12-negative electrode lead terminal.
Detailed Description
As shown in fig. 1 to 4, for the claw type ultrasonic transducer of the present invention, comprising a sandwich type piezoelectric ultrasonic transducer 1, an amplitude transformer 2 and a claw type omnidirectional radiator 3, one end of the amplitude transformer 2 is fixedly connected with the sandwich type piezoelectric ultrasonic transducer 1, the other end of the amplitude transformer 2 is fixedly connected with the claw type omnidirectional radiator 3, the sandwich type piezoelectric ultrasonic transducer 1 comprises a back cover plate 4, a piezoelectric ceramic crystal stack 5 and a front cover plate 6, the back cover plate 4, the piezoelectric ceramic crystal stack 5 and the front cover plate 6 are fixed together through stress bolts, the claw type omnidirectional radiator 3 comprises a claw bottom 7 and claw fingers 8, one end of the claw bottom 7 is fixedly connected with the amplitude transformer 2, the claw fingers 8 are fixedly connected to the other end of the claw bottom 7, the claw bottom 7 is of an open structure, a plurality of claw fingers 8 are arranged, the claw fingers 8 are uniformly distributed along the circumferential direction of the claw bottom 7, and the resonance frequency is changed by changing the thickness, the width and the length of the claw fingers 8; the amplitude transformer 2 is a metal rod-shaped energy concentrator, plays a role in amplitude amplification, can convert longitudinal vibration into bending vibration along the axial direction through the open design of the claw bottom 7, and realizes high displacement amplitude and high-order vibration of the claw fingers 8, so that a radiation sound field with high sound radiation efficiency and high uniformity is realized, the vibration frequency of the claw fingers 8 is changed by changing the thickness, the width and the length of the claw fingers, and the same-frequency resonance with the sandwich type piezoelectric ultrasonic transducer 1 is realized.
Under the same frequency condition, the wavelength of bending waves is shorter, the bending vibration order of the same claw finger 8 is greatly higher than the longitudinal vibration order, so that the distance between the bending wave crests is far smaller than that between the longitudinal wave crests, correspondingly, the radiation sound field along the length direction of the claw finger 8 is more uniform, in addition, the bending waves in the claw finger 8 are more in number and have larger displacement amplitude and volume deformation, the sound radiation efficiency is greatly improved, each claw finger 8 is discrete and is circumferentially and uniformly distributed along the claw bottom 7, and inward and outward omnidirectional radiation can be realized.
The piezoelectric ceramic crystal stack 5 is formed by stacking a plurality of piezoelectric ceramic wafers 9 polarized in thickness; is made of PZT series piezoelectric ceramic materials.
The piezoelectric ceramic wafers 9 are in a ring-shaped structure, and the number of the piezoelectric ceramic wafers 9 is even.
The section of the amplitude transformer 2 is in one of a conical shape, an exponential shape, a step shape, a catenary shape or a Gaussian shape, a flange plate is arranged at the displacement amplitude joint surface of the amplitude transformer 2, and the flange plate is one of a threaded flange, a perforated flange or a skirt flange; the flange is used for mechanical fixation.
One end of the amplitude transformer 2 is provided with a screw hole, and the amplitude transformer 2 is fixedly connected with the other amplitude transformer 2 or the claw bottom 7 through a screw rod; the amplitude transformer 2 can be connected in multiple stages to realize the change of the total length of the amplitude transformer 2.
The shape of the claw bottom 7 is one of a cross shape, a meter shape, a bowl shape, a disc shape or a cup shape, and the section of the claw finger 8 is one of a square shape, a round shape, a trapezoid shape and a fan shape with the same section or a variable section column.
The claw finger 8 and the claw bottom 7 are of an integrated structure or a split structure, and when the claw finger 8 and the claw bottom 7 are of the split structure, the claw bottom 7 and the claw finger 8 are fixedly connected through bolts.
The claw fingers 8 and the claw bottom 7 are made of one or more of stainless steel, aluminum alloy and titanium alloy.
The amplitude transformer 2 is fixedly connected with the claw bottom 7 through a high-strength screw, and the radiation area of the front end of the amplitude transformer 2 is smaller than the area of the claw bottom 7; the condition that the radiation area of the front end of the amplitude transformer 2 is smaller than the area of the claw bottom 7 is that bending vibration is generated, and the bending vibration of the claw bottom 7 can drive the bending vibration of the claw finger 8.
The amplitude transformer 2 is a metal rod-shaped energy concentrator, plays a role in amplitude amplification, can convert longitudinal vibration into bending vibration along the axial direction through the open design of the claw bottom 7, and realizes high displacement amplitude and high-order vibration of the claw fingers 8, so that a radiation sound field with high sound radiation efficiency and high uniformity is realized, the vibration frequency of the claw fingers 8 is changed by changing the thickness, the width and the length of the claw fingers, and the same-frequency resonance with the sandwich type piezoelectric ultrasonic transducer 1 is realized.
Under the same frequency condition, the wavelength of bending waves is shorter, the bending vibration order of the same claw finger 8 is greatly higher than the longitudinal vibration order, so that the distance between the bending wave crests is far smaller than that between the longitudinal wave crests, correspondingly, the radiation sound field along the length direction of the claw finger 8 is more uniform, in addition, the bending waves in the claw finger 8 are more in number and have larger displacement amplitude and volume deformation, the sound radiation efficiency is greatly improved, each claw finger 8 is discrete and is circumferentially and uniformly distributed along the claw bottom 7, and inward and outward omnidirectional radiation can be realized.
When the arrow points to the characteristic frequency of 21718Hz and the thickness of the claw finger 8 is 10mm in FIG. 3, the maximum total displacement generated by the bending vibration of the claw finger 8 is 4.6(10^ 12m), when the circled out part in FIG. 5 is 22100Hz and the thickness of the pipe wall is 10mm, the maximum total displacement generated by the vibration of the pipe wall is 2.1(10^ 12m), when the arrow points to the characteristic frequency of 22146Hz and the thickness of the claw finger 8 is 5mm in FIG. 4, the maximum total displacement generated by the bending vibration of the claw finger 8 is 3.8(10^ 12m), when the arrow points to the characteristic frequency of 22366Hz and the thickness of the claw finger 8 is 5mm in FIG. 6, the maximum total displacement generated by the bending vibration of the claw finger 8 is 2.6(10^ 12m), comparing FIG. 3 with FIGS. 5 and 4 with FIG. 6 respectively, it can be known that the thickness of the pipe wall is equal to the characteristics, claws or fingers 8 of similar frequency, the displacement amplitude of the device is obviously higher than that of the traditional tubular ultrasonic transducer, and as can be seen by comparing fig. 3 with fig. 4, under the conditions of similar frequency and same length, the displacement amplitude of the device is influenced by changing the thickness of the claw fingers 8.
The utility model discloses in when realizing high frequency high power, realize 360 all-round acoustic radiation through the bending vibration mode of high order, can improve acoustic radiation efficiency and sound field effect scope, can improve the homogeneity of radiation sound field again to can improve the treatment effeciency in supersound liquid fields such as supersound sewage treatment, supersound medicine extraction, supersound biofuel preparation, ultrasonic cleaning by a wide margin.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made on the basis of the present invention to achieve substantially the same technical effects are all covered by the scope of the present invention.
Claims (9)
1. A claw-type ultrasonic transducer, characterized by: the sandwich type piezoelectric ultrasonic transducer comprises a sandwich type piezoelectric ultrasonic transducer, an amplitude transformer and a claw type omnidirectional radiator, wherein one end of the amplitude transformer is fixedly connected with the sandwich type piezoelectric ultrasonic transducer, the other end of the amplitude transformer is fixedly connected with the claw type omnidirectional radiator, the sandwich type piezoelectric ultrasonic transducer comprises a rear cover plate, a piezoelectric ceramic crystal stack and a front cover plate, the rear cover plate, the piezoelectric ceramic crystal stack and the front cover plate are fixed together through a stress bolt, the claw type omnidirectional radiator comprises a claw bottom and a plurality of claw fingers, one end of the claw bottom is fixedly connected with the amplitude transformer, the claw fingers are fixedly connected to the other end of the claw bottom, the claw bottom is of an open structure, the claw fingers are uniformly distributed along the circumferential direction of the claw bottom, and the resonance frequency is changed by changing the thickness, the width and the length of the claw fingers.
2. The ultrasonic jaw transducer of claim 1, wherein: the piezoelectric ceramic crystal stack is formed by stacking a plurality of piezoelectric ceramic crystal wafers polarized in thickness.
3. The ultrasonic jaw transducer of claim 2, wherein: the piezoelectric ceramic wafers are of a circular ring-shaped structure, and the number of the piezoelectric ceramic wafers is even.
4. The ultrasonic jaw transducer of claim 2, wherein: annular electrode plates are clamped between every two adjacent piezoelectric ceramic wafers, between the piezoelectric ceramic wafers and the front cover plate and between the piezoelectric ceramic wafers and the rear cover plate respectively and serve as positive electrode lead ends and negative electrode lead ends respectively, the positive electrode lead ends and the negative electrode lead ends are arranged alternately, the positive electrode lead ends are connected with the positive electrode lead ends, the negative electrode lead ends are connected with the negative electrode lead ends, and the two ends of the positive electrode lead ends and the two ends of the negative electrode lead ends are respectively in contact connection with the front cover plate and the rear cover plate.
5. The ultrasonic jaw transducer of claim 1, wherein: the section of the amplitude transformer is in one of a conical shape, an exponential shape, a step shape, a catenary shape or a Gaussian shape, a flange plate is arranged at a displacement amplitude joint surface of the amplitude transformer, and the flange plate is one of a threaded flange, a perforated flange or a skirt flange.
6. The ultrasonic jaw transducer of claim 1, wherein: one end of the amplitude transformer is provided with a screw hole, and the amplitude transformer is fixedly connected with the other amplitude transformer or the claw bottom through a screw rod.
7. The ultrasonic jaw transducer of claim 1, wherein: the shape of the bottom of the claw is one of a cross shape, a meter shape, a bowl shape, a disc shape or a cup shape, and the section of the claw is a column with the same section or a column with the same section, which is one of a square shape, a round shape, a trapezoid shape and a fan shape.
8. The ultrasonic jaw transducer of claim 1, wherein: the claw finger and the claw bottom are of an integrated structure or a split structure, and when the claw finger and the claw bottom are of the split structure, the claw bottom is fixedly connected with the claw finger through a bolt.
9. The ultrasonic jaw transducer of claim 1, wherein: the amplitude transformer is fixedly connected with the claw bottom through a high-strength screw rod, and the radiation area of the front end of the amplitude transformer is smaller than that of the claw bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020101150.2U CN211678638U (en) | 2020-01-17 | 2020-01-17 | Claw type ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020101150.2U CN211678638U (en) | 2020-01-17 | 2020-01-17 | Claw type ultrasonic transducer |
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| Publication Number | Publication Date |
|---|---|
| CN211678638U true CN211678638U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020101150.2U Expired - Fee Related CN211678638U (en) | 2020-01-17 | 2020-01-17 | Claw type ultrasonic transducer |
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|---|---|
| CN (1) | CN211678638U (en) |
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2020
- 2020-01-17 CN CN202020101150.2U patent/CN211678638U/en not_active Expired - Fee Related
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