CN105689249A - Compound drive piezoelectric ultrasonic-pipe-shaped transducer - Google Patents
Compound drive piezoelectric ultrasonic-pipe-shaped transducer Download PDFInfo
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- CN105689249A CN105689249A CN201610163820.1A CN201610163820A CN105689249A CN 105689249 A CN105689249 A CN 105689249A CN 201610163820 A CN201610163820 A CN 201610163820A CN 105689249 A CN105689249 A CN 105689249A
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- 150000001875 compounds Chemical class 0.000 title abstract 3
- 239000013078 crystal Substances 0.000 claims abstract description 71
- 239000002184 metal Substances 0.000 claims abstract description 62
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Classifications
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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
- B06B1/0607—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 using multiple elements
- B06B1/0622—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 using multiple elements on one surface
- B06B1/064—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 using multiple elements on one surface with multiple active layers
Abstract
The invention provides a compound drive piezoelectric ultrasonic-pipe-shaped transducer and relates to the field of transducers. The compound drive piezoelectric ultrasonic-pipe-shaped transducer comprises a round-pipe-shaped metal shell, a prestress applying device, inner end vibration matching blocks, outer end vibration matching blocks and piezoelectric crystal stacks. At least three sets of piezoelectric crystal stacks are arranged. Each piezoelectric crystal stack comprises an odds number of metal electrode plates and an even number of piezoelectric ceramic crystals, wherein the metal electrode plates and the piezoelectric ceramic crystals are stacked at intervals. The adjacent electrode plates are connected with electrodes opposite in polarity. The prestress applying device comprises a center supporting block and screws. Columnar protrusions are arranged on the circumferential face of the center supporting block, wherein the number of the columnar protrusions is the same as that of the piezoelectric crystal stacks. An inserting hole is formed in each columnar protrusion. A threaded hole is formed in one end of each inner end vibration matching block, and the other end of each inner end vibration matching block is in butt joint with one end of the corresponding set of piezoelectric crystal stack. One end of each outer end vibration matching block is fixedly connected with the shell, and the other end of each outer end vibration matching block is fixedly connected with the other end of the corresponding piezoelectric crystal stack. One end of each screw stretches in the corresponding inserting hole, and the other end of each screw is in threaded connection with a threaded hole. The technical problem that the power of an existing transducer is low is solved.
Description
Technical field
The present invention relates to field of transducer, especially relate to a kind of tubular transducer of composite flooding piezoelectric supersonic。
Background technology
The function of ultrasonic transducer is the electrical power of input to convert to mechanical output (i.e. ultrasound wave) pass again, and a part of power that autophage is little。
Along with constantly bringing forth new ideas of ultrasonic technique, improving constantly of application level, power ultrasonic obtains a wide range of applications in fields such as industrial and agricultural production, health care, bio-pharmaceuticals and food processings。Ultrasonic transducer is as the core component of ultrasound processing equipment, and the quality of its performance directly decides the application effect of power ultrasonic。
At present, in ultrasound processing equipment, widely used transducer is extensional vibration sandwich piezoelectric transducer。This is because the simple in construction of this type of transducer, stable performance, and have that power capacity is big and electromechanical conversion efficiency advantages of higher。; development along with new high-tech industry; the raising of environment for human survival quality and material requirement, produces and power ultrasonic used of living processes equipment and the power capacity of its transducer, acoustic radiation efficiency, acoustic wave action scope etc. are had higher requirement。Single extensional vibration sandwich piezoelectric ultrasonic transducer, due to limited power capacity, the deficiency such as acoustic radiation area is little, acoustic wave action direction is single, can not meet existing large power supersonic at the needs produced and in life。
Applying relatively small number of another kind of transducer in ultrasound processing equipment is radial vibration sandwich transducer, this type of transducer is to be embedded in metal tube by piezoelectric ceramic tube by the method for heat expansion and cold contraction, and utilizes this principle that piezoelectric ceramic circular tube is applied the unidirectional radial direction prestressing force of ecto-entad。The swept area of radial vibration sandwich transducer is relatively big, and the sound wave of generation can realize the Omnidirectional radiation along radius space。But, the prestressing force size applied by expanding with heat and contract with cold is difficult to control, prestressing force relatively senior general causes that piezoelectric ceramic tube crushes, the power capacity of the less transducer of prestressing force will not reach the performance required by transducer, and transducer input electric power bigger time, strong vibration is easily caused by high voltage arc and electrode delamination, so the application that this type of transducer is in producing and living is relatively fewer。
Based on this, the invention provides a kind of tubular transducer of composite flooding piezoelectric supersonic to solve the technical problem of above two ultrasonic transducer。
Summary of the invention
It is an object of the invention to provide a kind of tubular transducer of composite flooding piezoelectric supersonic, with solve extensional vibration sandwich piezoelectric ultrasonic transducer of the prior art due to limited power capacity, acoustic radiation area is little, acoustic wave action direction is single, and prestressing force suffered by radial vibration sandwich transducer piezoelectric ceramic tube is wayward, the caducous technical problem of electrode。
Providing a kind of tubular transducer of composite flooding piezoelectric supersonic in an embodiment of the present invention, the described tubular transducer of composite flooding piezoelectric supersonic includes tubular type metal shell, prestress application device, inner vibration match block, outer end vibration match block and stack of piezo crystals；Described prestress application device, described inner vibration match block, described outer end vibration match block and described stack of piezo crystals are positioned at described metal shell；The two ends of described metal shell are connected with metal cover board；
Described stack of piezo crystals is not less than three groups；Often organize described stack of piezo crystals and all include metal electrode film described in odd number sheet and even slice piezoelectric ceramic wafer；All of described piezoelectric ceramic wafer overlap is placed；All having clamped a described metal electrode film described in adjacent two panels between piezoelectric ceramic wafer, the outside of the described piezoelectric ceramic wafer being positioned at two ends is also placed with a described metal electrode film respectively；Adjacent described electrode slice connects opposite polarity electrode respectively through connecting line；
Described prestress application device includes central supported block and screw rod；Described central supported block is cylindrical；The periphery of described central supported block is provided with the column-shaped projection identical with the quantity of described stack of piezo crystals；All of described column-shaped projection is uniformly distributed along the circumference of described central support posts；The center, top of each described column-shaped projection is provided with plug-in opening；
The quantity of described inner vibration match block and the quantity of described outer end vibration match block are all identical with the quantity of described stack of piezo crystals；Described inner vibration match block is cylindrical；The center of described inner vibration match block one end is provided with screwed hole；The other end of described inner vibration match block and one end abutting of stack of piezo crystals described in a group；One end of described outer end vibration match block is affixed with the inwall of described metal shell；The other end of described outer end vibration match block abuts with the other end of described stack of piezo crystals。
The quantity of described screw rod is identical with the quantity of described stack of piezo crystals；One end of every described screw rod is respectively protruding in a described plug-in opening, the other end respectively with a described screw hole。
Optionally, described piezoelectric ceramic wafer is circular。
Optionally, described metal electrode film includes electrode portion and connecting portion, and described connecting portion is affixed with described electrode portion, and described connecting portion is for being connected with electrode；Described electrode portion is the circular piece identical with described piezoelectric ceramic wafer external diameter, and described electrode portion overlaps with described piezoelectric ceramic wafer and stacks。
Optionally, described inner vibration match block is cylindrical, and two ends are plane；The external diameter of described inner vibration match block is identical with the external diameter of described piezoelectric ceramic wafer；Described inner vibration match block is overlapping with the electrode portion of described electrode slice with one end that described stack of piezo crystals abuts places。
Optionally, described outer end vibration match block is cylindrical, and the external diameter of described outer end vibration match block is identical with the external diameter of described piezoelectric ceramic wafer；One end that described outer end vibration match block abuts with described stack of piezo crystals is planar ends, and described planar ends is overlapping with the described electrode portion of the described stack of piezo crystals of abutting places。
Optionally, the center of one of them described metal cover board is provided with through wires hole, and described connecting line is passed described metal cover board by described through wires hole and is connected with electrode。
Optionally, two described metal cover boards are splayed cover plate。
Optionally, the middle part of described screw rod is provided with hexagonal screw head。
Optionally, it is provided with female thread in described plug-in opening；The hand of spiral of described female thread is contrary with the hand of spiral of described screwed hole, and described screw rod is double threaded screw, and described screw rod and plug-in opening are spirally connected。
Optionally, vibration match block in described outer end is one-body molded with described metal shell。
Piezoelectric ceramics has the following characteristics that when voltage acts on piezoelectric ceramics, will produce mechanically deform with the change of voltage and frequency。On the other hand, when piezoelectric ceramics is subject to the effect of external force and deforms, its two comparative electrode faces produce positive and negative opposite charge。Utilize this principle, just piezoelectric ceramics can be used as ultrasonic transducer。The described tubular transducer of composite flooding piezoelectric supersonic provided by the invention is exactly the feature that make use of piezoelectric ceramic wafer, is energized to piezoelectric ceramic wafer by electrode slice, thus creating supersonic vibration。
The described tubular transducer of composite flooding piezoelectric supersonic provided by the invention, match block and outer end vibration match block is vibrated to often group stack of piezo crystals offer prestressing force by often organizing the inner of stack of piezo crystals both sides, the radial vibration of the metal shell driving tubular type it is converted into by the extensional vibration of the many groups of stack of piezo crystals being uniformly distributed circumferentially, simplify the labyrinth of existing radial vibration sandwich transducer, also improve its power capacity and acoustic radiation efficiency。
Adopt prestress application device, pass through rotary screw, change the distance between the inner vibration match block and central supported block, many group stack of piezo crystals are applied sufficiently large prestressing force by collaborative outer end vibration match block block and metal shell, the power capacity of transducer is so not only greatly improved, and enhances the radial rigidity of transducer。Simultaneously facilitate regulable control, piezoelectric ceramic wafer will not be damaged by pressure because prestressing force is excessive, without causing that because prestressing force is too small the power capacity of whole stack of piezo crystals is less, can not meet demand。
Metal shell, while radial vibration, drives metal cover board to do extensional vibration, thus the sound wave realizing transducer generation is radiation the comprehensive of free space, further improves the radiation efficiency of transducer。
This device is connected traditional sandwich piezoelectric transducer of porpoise match block with by center bolt a great difference, not against the fixing piezoelectric ring of bolt, but its stack of piezo crystals is replaced the piezoelectric chip of annular by whole piece piezoelectric chip, vibrate match block, outer end vibration match block by the inner collaborative fixing。Owing to the piezoelectric ring that piezoelectric patches is more traditional has bigger volume, so further increasing the power capacity of transducer。And, adopt electrode slice to do electrode and by the inner vibration match block, outer end vibration match block choking tightly, it is not easy to come off。
Based on this, the present invention, than original technology, has power capacity big, and acoustic irradiation area is big, it is possible to Omnidirectional radiation, and the prestressing force that stack of piezo crystals is subject to is easy to regulate, and the advantage of electrode difficult drop-off。
Accompanying drawing explanation
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, the accompanying drawing used required in detailed description of the invention or description of the prior art will be briefly described below, apparent, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
Fig. 1 is the tubular transducer front view of embodiment composite flooding piezoelectric supersonic；
Fig. 2 is the tubular transducer top view of embodiment composite flooding piezoelectric supersonic；
Fig. 3 is that the embodiment tubular transducer of composite flooding piezoelectric supersonic is bowed sectional view；
Fig. 4 is stack of piezo crystals structural representation；
Fig. 5 is stack of piezo crystals side view。
Accompanying drawing labelling:
1-metal shell；2-the inner vibration coupling 3-outer end vibration coupling
Block；Block；
4-stack of piezo crystals；5-metal cover board；6-central supported block；
7-screw rod；8-column-shaped projection；9-plug-in opening；
10-screwed hole；11-through wires hole；12-hexagonal screw head；
13-piezoelectric ceramic wafer；14-electrode portion；15-connecting portion。
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiments。Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention。
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship; be for only for ease of the description present invention and simplifying and describe; rather than instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention。Additionally, term " first ", " second ", " the 3rd " are only for descriptive purposes, and it is not intended that indicate or hint relative importance。
In describing the invention, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or the connection of one；Can be mechanically connected, it is also possible to be that electric welding connects；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals。For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention。
Embodiment
As Figure 1-5, providing a kind of tubular transducer of composite flooding piezoelectric supersonic in the present embodiment, the described tubular transducer of composite flooding piezoelectric supersonic includes tubular type metal shell 1, central supported block 6, screw rod 7, three 2, three outer end vibration match block 3 of inner vibration match block and three groups of stack of piezo crystals 4；Central supported block 6, screw rod 7, described inner vibration match block 2, described outer end vibration match block 3 and described stack of piezo crystals 4 are positioned at described metal shell 1；The two ends of described metal shell 1 are connected with metal cover board 5；Central supported block 6, screw rod 7, described inner vibration match block 2, described outer end vibration match block 3 all adopt metal material, it is provided that stronger stress, have stronger rigidity, thus improving the power capacity of device。
Often organize described stack of piezo crystals 4 and all include metal electrode film described in odd number sheet and even slice piezoelectric ceramic wafer 13；All of described piezoelectric ceramic wafer 13 is overlapping to be placed；All having clamped a described metal electrode film described in adjacent two panels between piezoelectric ceramic wafer 13, the outside of the described piezoelectric ceramic wafer 13 being positioned at two ends is also placed with a described metal electrode film respectively；Adjacent described electrode slice connects opposite polarity electrode respectively through connecting line。
Described central supported block 6 is cylindrical；The periphery of described central supported block 6 is provided with three column-shaped projections 8；Three described column-shaped projections 8 are uniformly distributed along the circumference of described central support posts；It is uniformly distributed and can give each group of uniform prestressing force of piezo crystals sheet pile, make housing vibrate uniformly。The center, top of each described column-shaped projection 8 is provided with plug-in opening 9, and centrally disposed place makes active force be centrally located, and strengthens the vibration performance of whole device。
Described inner vibration match block 2 is cylindrical；The center of described inner vibration match block 2 one end is provided with screwed hole 10；The other end of described inner vibration match block 2 and one end abutting of stack of piezo crystals 4 described in a group；Described outer end vibration match block 3 is cylindrical；One end of described outer end vibration match block 3 is planar ends, and the other end is curved end, and the curvature of described curved end is identical with the curvature of described metal shell 1 inwall, and one end that described outer end vibration match block 3 is curved surface abuts with described metal shell 1 inwall；The other end of described outer end vibration match block 3 abuts with the other end of described stack of piezo crystals 4。
The quantity of described screw rod 7 is three；One end of every described screw rod 7 is respectively protruding in a described plug-in opening 9, and the other end is spirally connected with a described screwed hole 10 respectively。That is the both sides of three groups of stack of piezo crystals 4 have an outer end vibration match block 3 and an inner vibration match block 2 to give its two-way prestressing force。Being all electrode slice owing to often organizing the outermost end of stack of piezo crystals 4, say, that the electrode slice of one end vibrates match block 3 with outer end and abuts, another electrode slice of another end abuts with inner vibration match block 2。And each inner vibration match block 2 gives its outside prestressing force with by a screw rod 7。
The described tubular transducer of composite flooding piezoelectric supersonic provided by the invention, be make use of the feature of piezoelectric ceramic wafer 13, is energized to piezoelectric ceramic wafer 13 by electrode slice, thus creating supersonic vibration。Prestressing force is provided to often group stack of piezo crystals 4 by the inner vibration match block 2 and outer end vibration match block 3 often organizing stack of piezo crystals 4 both sides, the radial vibration of the metal shell 1 driving tubular type it is converted into by the extensional vibration of the many groups of stack of piezo crystals being uniformly distributed circumferentially 4, simplify the labyrinth of existing radial vibration sandwich transducer, also improve its power capacity and acoustic radiation efficiency。
Adopt prestress application device, by rotary screw 7, change the distance between the inner vibration match block 2 and central supported block 6, many group stack of piezo crystals 4 are applied sufficiently large pre-prestressing force by collaborative outer end vibration match block 3 pieces and metal shell 1, the power capacity of transducer is so not only greatly improved, and enhances the radial rigidity of transducer。Simultaneously facilitate regulable control, piezoelectric ceramic wafer 13 will not be damaged because prestressing force is excessive by pressure, less without the power capacity causing whole stack of piezo crystals 4 because prestressing force is too small, can not meet demand。
Metal shell 1, while radial vibration, drives metal cover board 5 to do extensional vibration, thus the sound wave realizing transducer generation is radiation the comprehensive of free space, further improves the radiation efficiency of transducer。
This device is connected traditional sandwich piezoelectric transducer of porpoise match block with by center bolt 7 a great difference, not against the fixing piezoelectric ring of bolt, but its stack of piezo crystals 4 is replaced the piezoelectric chip of annular by whole piece piezoelectric chip, choke by the inner vibration match block 2, outer end vibration match block 3 and fix。Owing to the piezoelectric ring that piezoelectric patches is more traditional has bigger volume, so further increasing the power capacity of transducer。And, adopt electrode slice to do electrode and by the inner vibration match block 2, outer end vibration match block 3 choking tightly, it is not easy to come off。
Based on this, the present invention, than original technology, has power capacity big, and acoustic irradiation area is big, it is possible to Omnidirectional radiation, and the prestressing force that stack of piezo crystals 4 is subject to is easy to regulate, and the advantage of electrode difficult drop-off。
Such as Fig. 3-5, in the alternative of the present embodiment, described piezoelectric ceramic wafer 13 is circular。
Circular piezoelectric ceramic wafer is prone to processing, than traditional sandwich piezoelectric transducer, need not fix by center pre-stressed bolt, under external diameter same case, the application adopts the piezoelectric ceramics crystalline substance heap that the stack of piezo crystals 4 that ceramic wafers forms is made up of annulus than traditional sandwich piezoelectric transducer to have bigger volume, thus further increasing the power capacity of transducer。
Further, described metal electrode film includes electrode portion 14 and connecting portion 15, and described connecting portion 15 is affixed with described electrode portion 14, and described connecting portion 15 is for being connected with electrode；Described electrode portion 14 is the circular piece identical with described piezoelectric ceramic wafer 13 external diameter, and described electrode portion 14 overlaps with described piezoelectric ceramic wafer 13 and stacks。
Being arranged so that together with the whole laminated of piezoelectric ceramic wafer 13 and electrode slice, it is to avoid when transducer input electric power is bigger, strong vibration is easily caused by high voltage arc and electrode delamination。
Further, described inner vibration match block 2 is cylindrical, and two ends are plane；The external diameter of described inner vibration match block 2 is identical with the external diameter of described piezoelectric ceramic wafer 13；Described inner vibration match block 2 is overlapping with the electrode portion 14 of described electrode slice with one end that described stack of piezo crystals 4 abuts places。
So arrange so that inner vibration match block 2 give with prestressing force vertical and act in stack of piezo crystals 4 uniformly, it is prevented that prestressing force is concentrated and is caused that piezoelectric ceramic wafer 13 crushes。
Further, described outer end vibration match block 3 is cylindrical, and the external diameter of described outer end vibration match block 3 is identical with the external diameter of described piezoelectric ceramic wafer 13；One end that described outer end vibration match block 3 abuts with described stack of piezo crystals 4 is planar ends, and described planar ends is overlapping with the described electrode portion 14 of the described stack of piezo crystals 4 of abutting places。The other end is curved end, abuts with metal shell, and its radius of curvature is equal with the radius of curvature of metal shell。
So arrange so that outer end vibration match block 3 give with prestressing force vertical and act in stack of piezo crystals 4 uniformly, it is prevented that prestressing force is concentrated and is caused that piezoelectric ceramic wafer 13 crushes。
Such as Fig. 1-2, in the alternative of the present embodiment, the center of one of them described metal cover board 5 is provided with through wires hole 11, and described connecting line is passed described metal cover board 5 by described through wires hole 11 and is connected with electrode。
Through wires hole 11 is set and is easy to penetrating of electric wire。
Further, two described metal cover boards 5 are splayed cover plate。The cover plate of all the other shapes can certainly be arranged to。
Such as Fig. 3, in the alternative of the present embodiment, the middle part of described screw rod 7 is provided with hexagonal screw head 12。
The setting of hexagonal screw head 12 is easy to screw screw rod 7。
Further, it is provided with female thread in described plug-in opening 9；The hand of spiral of described female thread is contrary with the hand of spiral of described screwed hole 10, and described screw rod 7 is double threaded screw 7, and described screw rod 7 is spirally connected with plug-in opening 9。
The mode of double threaded screw 7 can significantly regulate prestressing force。
Or, described screw rod 7 is stepped, and vibrating one end of being spirally connected of match block 2 with the inner is thicker thread segment。And be thinner smooth shank portions with one end of central supported block 6 grafting, it is inserted directly in plug-in opening 9。This mode prestressing force range of accommodation is little, but processes well。
In the alternative of the present embodiment, vibration match block 3 in described outer end is one-body molded with described metal shell 1。
The relatively good processing of mode abutted, but one-body molded, its objective is to avoid forming contact surface between outer end vibration match block 3 and metal shell 1, effectively prevent ultrasonic energy transmission loss between contact surface。
In the alternative of the present embodiment, by four groups of stack of piezo crystals 4 in cross orthogonal arrangement, stack of piezo crystals 4 is to be staggered formed by six discoidal piezoelectric ceramic wafers and seven plate electrode sheets, and the polarised direction of adjacent two piezoelectric ceramic wafers is contrary。There are four protruding column-shaped projections the side of central supported block 6, and the angle of adjacent two column-shaped projections is 90 degree。
In the alternative of the present embodiment, by four groups of stack of piezo crystals 4 in cross orthogonal arrangement, stack of piezo crystals 4 is to be staggered formed by four discoidal piezoelectric ceramic wafers and five plate electrode sheets, and the polarised direction of adjacent two piezoelectric ceramic wafers is contrary。There are four protruding column-shaped projections the side of central supported block 6, and the angle of adjacent two column-shaped projections is 90 degree。Other parts and structure, connecting relation and embodiment 1 or 2 are identical。
In the alternative of the present embodiment, comprising six groups of stack of piezo crystals 4, stack of piezo crystals 4 is to be staggered form by by four discoidal piezoelectric ceramic wafers and five plate electrode sheets, and the polarised direction of adjacent two piezoelectric ceramic wafers is contrary。There are four protruding column-shaped projections the side of central supported block 6, and the angle of adjacent two column-shaped projections is 60 degree。The metal shell 1 of the present invention, the inner vibrate match block 2, outer end vibrates match block 3, the size of central supported block 6, upper cover plate, lower cover can select according to actual requirement of engineering。In the group number of stack of piezo crystals 4 groups and often group stack of piezo crystals 4, the sheet number of piezoelectric ceramic wafer can be combined according to the requirement of power。Central supported block 6 can be arranged as required to into square, cuboid, six prismatics etc.。
In the alternative of the present embodiment, between two described metal cover boards 5 and described metal shell 1, it is respectively arranged with sealing ring。
Improve sealing characteristics further, it is prevented that the entrance of dust and moisture。
In the alternative of the present embodiment, two described metal cover boards 5 are adopted with described metal shell 1 and are screwed。
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme。
Claims (10)
1. the tubular transducer of composite flooding piezoelectric supersonic, it is characterised in that include tubular type metal shell, prestress application device, inner vibration match block, outer end vibration match block and stack of piezo crystals；Described prestress application device, described inner vibration match block, described outer end vibration match block and described stack of piezo crystals are positioned at described metal shell；The two ends of described metal shell are connected with metal cover board；
Described stack of piezo crystals is not less than three groups；Often organize described stack of piezo crystals and all include metal electrode film described in odd number sheet and even slice piezoelectric ceramic wafer；All of described piezoelectric ceramic wafer overlap is placed；All having clamped a described metal electrode film described in adjacent two panels between piezoelectric ceramic wafer, the outside of the described piezoelectric ceramic wafer being positioned at two ends is also placed with a described metal electrode film respectively；Adjacent described electrode slice connects opposite polarity electrode respectively through connecting line；
Described prestress application device includes central supported block and screw rod；Described central supported block is cylindrical；The periphery of described central supported block is provided with the column-shaped projection identical with the quantity of described stack of piezo crystals；All of described column-shaped projection is uniformly distributed along the circumference of described central support posts；The center, top of each described column-shaped projection is provided with plug-in opening；
The quantity of described inner vibration match block and the quantity of described outer end vibration match block are all identical with the quantity of described stack of piezo crystals；Described inner vibration match block is cylindrical；The center of described inner vibration match block one end is provided with screwed hole；The other end of described inner vibration match block and one end abutting of stack of piezo crystals described in a group；One end of described outer end vibration match block is affixed with the inwall of described metal shell；The other end of described outer end vibration match block abuts with the other end of described stack of piezo crystals；
The quantity of described screw rod is identical with the quantity of described stack of piezo crystals；One end of every described screw rod is respectively protruding in a described plug-in opening, the other end respectively with a described screw hole。
2. the tubular transducer of composite flooding piezoelectric supersonic according to claim 1, it is characterised in that described piezoelectric ceramic wafer is circular。
3. the tubular transducer of composite flooding piezoelectric supersonic according to claim 2, it is characterised in that described metal electrode film includes electrode portion and connecting portion, described connecting portion is affixed with described electrode portion, and described connecting portion is for being connected with electrode；Described electrode portion is the circular piece identical with described piezoelectric ceramic wafer external diameter, and described electrode portion overlaps with described piezoelectric ceramic wafer and stacks。
4. the tubular transducer of composite flooding piezoelectric supersonic according to claim 2, it is characterised in that described inner vibration match block is cylindrical, and two ends are plane；The external diameter of described inner vibration match block is identical with the external diameter of described piezoelectric ceramic wafer；Described inner vibration match block is overlapping with the electrode portion of described electrode slice with one end that described stack of piezo crystals abuts places。
5. the tubular transducer of composite flooding piezoelectric supersonic according to claim 4, it is characterised in that described outer end vibration match block is cylindrical, the external diameter of described outer end vibration match block is identical with the external diameter of described piezoelectric ceramic wafer；One end that described outer end vibration match block abuts with described stack of piezo crystals is planar ends, and described planar ends is overlapping with the described electrode portion of the described stack of piezo crystals of abutting places。
6. the tubular transducer of composite flooding piezoelectric supersonic according to claim 1-5, it is characterised in that the center of one of them described metal cover board is provided with through wires hole, described connecting line is passed described metal cover board by described through wires hole and is connected with electrode。
7. the tubular transducer of composite flooding piezoelectric supersonic according to claim 6, it is characterised in that two described metal cover boards are splayed cover plate。
8. the tubular transducer of composite flooding piezoelectric supersonic according to claim 1-5, it is characterised in that the middle part of described screw rod is provided with hexagonal screw head。
9. the tubular transducer of composite flooding piezoelectric supersonic according to claim 8, it is characterised in that be provided with female thread in described plug-in opening；The hand of spiral of described female thread is contrary with the hand of spiral of described screwed hole, and described screw rod is double threaded screw, and described screw rod and plug-in opening are spirally connected。
10. the tubular transducer of composite flooding piezoelectric supersonic according to any one of claim 1-5, it is characterised in that described outer end vibration match block is one-body molded with described metal shell。
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| CN105689249B (en) | 2018-06-29 |
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