CN-121972389-A - Bending disc transducer utilizing deformation of ceramic in thickness direction

CN121972389ACN 121972389 ACN121972389 ACN 121972389ACN-121972389-A

Abstract

The invention relates to a bending disc transducer utilizing deformation of a ceramic thickness direction, which comprises a disc-shaped inner supporting plate and a plurality of piezoelectric ceramic stacks, wherein the piezoelectric ceramic stacks are uniformly arranged at intervals along the circumferential direction of the inner supporting plate and are fixed on the outer side of the inner supporting plate, and the polarization direction of the piezoelectric ceramic stacks is consistent with the thickness direction of the piezoelectric ceramic stacks. The invention innovatively changes the driving mode, utilizes the stretching vibration of the piezoelectric ceramic stack in the thickness direction to drive the disc to generate bending vibration, so that the ceramic stack mainly bears compressive stress rather than tensile stress under the action of hydrostatic pressure, fully utilizes the characteristic of high compressive strength of ceramic materials, and realizes the breakthrough promotion of the hydrostatic pressure resistance of the bending disc transducer.

Inventors

MA ZHEN
HAO HAOQI
WANG XIAOFEI
ZHANG HUICHAO
ZHANG FENGHAI
SU SHIFEI
Meng Ken

Assignees

中国船舶集团有限公司第七一五研究所

Dates

Publication Date: 20260505
Application Date: 20260202

Claims (8)

1. A bending disk transducer utilizing deformation in a ceramic thickness direction, comprising: A disc-shaped inner support plate having a hollow structure; the piezoelectric ceramic stacks are uniformly arranged at intervals along the circumferential direction of the inner supporting plate, and the thickness direction of the piezoelectric ceramic stacks is along the radial direction of the inner supporting plate and is arranged outside the inner supporting plate; Wherein, the polarization direction of the piezoelectric ceramic stack is consistent with the thickness direction of the piezoelectric ceramic stack; The outer side of the inner supporting plate is provided with a first radial limiting part and a second radial limiting part corresponding to each piezoelectric ceramic stack, wherein the first radial limiting part and the second radial limiting part are used for limiting two end parts of the piezoelectric ceramic stacks in the thickness direction respectively; When the transducer works, the piezoelectric ceramic stack which is pre-compressed and fixed is excited by an alternating electric field to generate telescopic deformation along the thickness direction of the piezoelectric ceramic stack, and the deformation drives the inner support plate to generate axial bending vibration.
2. The bending disk transducer according to claim 1, wherein the radiation structure comprising the piezoelectric ceramic stack and the inner support plate is vertically and symmetrically distributed in the axial direction of the inner support plate to form a double-sided radiation structure.
3. The bending disk transducer according to claim 1, wherein the inner support plate is formed by butt-jointing an upper support plate and a lower support plate, and the inner edges of the upper support plate and the lower support plate are provided with mutually butt-jointed bosses.
4. The bending disk transducer according to claim 1, wherein the first radial limiting portion is located in a central region outside the inner support plate, the first radial limiting portion is a polygonal column protruding outwards in an axial direction of the inner support plate, the number of sides of the polygonal column is equal to that of the piezoelectric ceramic stacks, and the sides of the polygonal column are in one-to-one correspondence with and abut against inner ends of the piezoelectric ceramic stacks.
5. The bending disk transducer deformed in the thickness direction of ceramic according to claim 4, wherein the second radial limiting portion comprises a plurality of positioning structures which are arranged on the outer side of the inner supporting plate, distributed along the circumference and in one-to-one correspondence with the outer end portions of the piezoelectric ceramic stacks, the positioning structures are grooves or bosses, and the outer end portions of the piezoelectric ceramic stacks are embedded in or abutted against the grooves or bosses.
6. The bending disk transducer according to claim 1, wherein each of the piezoelectric ceramic stacks is composed of a plurality of piezoelectric ceramic sheets stacked in the thickness direction, and adjacent piezoelectric ceramic sheets are opposite in polarization direction and connected in series or parallel by electrodes.
7. The bending disk transducer according to claim 1, further comprising a package housing, wherein the inner support plate and the piezoelectric ceramic stack are hermetically mounted in the package housing, and wherein at least one disk surface of the package housing is a radiation surface made of an acoustically transparent material.
8. The bending disk transducer using ceramic thickness direction deformation according to claim 1, wherein inward concave deformation of said inner support plate is converted into additional compressive stress to said piezoelectric ceramic stack in its thickness direction under hydrostatic pressure.

Description

Bending disc transducer utilizing deformation of ceramic in thickness direction Technical Field The invention belongs to the technical field of underwater acoustic transducers, and particularly relates to a bending disc transducer utilizing deformation of ceramic in the thickness direction. Background The underwater acoustic transducer is a key device for realizing the mutual conversion of acoustic energy and electric energy, and is widely applied to the fields of underwater communication, target detection, marine resource exploration, environment monitoring and the like. Curved disc transducers are regarded as classical low frequency transducers and are valued for their relatively simple structure, small size, light weight and the possibility to obtain a large radiating area at lower frequencies. Traditional bending disk transducers employ radial deformation of a ceramic disk for acoustic radiation, resembling vibration of the tympanic membrane. This tympanic membrane form can cause the ceramic to bend and deform axially under hydrostatic pressure. For ceramics which are inherently resistant to pressure and pulling, the deformation is extremely prone to fracture at the bonding surface, and deep water work is difficult to realize under large dimensions, such as a curved disc with a diameter of 400mm, and the working water depth is less than 100 meters. In order to improve the pressure resistance of the bending disc transducer, the prior art mainly adopts two ways, namely, adopting an overflow type design, allowing water to enter the transducer to balance hydrostatic pressure, but introducing extra acoustic load and mass to obviously reduce radiation efficiency and influence frequency characteristics, and adopting an internal oil filling pressure compensation type design, which has complex structure, high reliability requirement and possibly has adverse effect on acoustic performance. There are other improvements, such as the patent application of patent publication CN107580274a for an inlaid bending disc underwater acoustic transducer, in which inlaid ceramic strips are used to increase the driving volume, but the improvements or failure to fundamentally change the stress state (still in tension or in bending) of the ceramic have limited effect on greatly improving the deep water working capacity of the large-size bending disc. While patent application CN109195066a, an ultralow frequency bending disk transducer, solves the problem of driving large-sized disks, the pressure-resistant bottleneck still exists. Therefore, a novel bending disc transducer structure is urgently needed, the stress state of the piezoelectric ceramic element in a deep water environment can be fundamentally improved while the advantages of low frequency and small size of the traditional bending disc are maintained, and the hydrostatic pressure resistance of the piezoelectric ceramic element is remarkably improved. Disclosure of Invention The technical problem to be solved by the invention is to provide the bending disc transducer which is deformed in the thickness direction of the ceramic, the driving mode of the transducer is innovatively changed, and the flexible vibration of the piezoelectric ceramic stack in the thickness direction is used for driving the disc to generate bending vibration, so that the ceramic stack is mainly subjected to compressive stress rather than tensile stress under the action of hydrostatic pressure, the characteristic of high compressive strength of the ceramic material is fully utilized, and the breakthrough promotion of the hydrostatic pressure resistance of the bending disc transducer is realized. The technical solution of the present invention is to provide a bending disk transducer using deformation in a ceramic thickness direction, comprising: A disc-shaped inner support plate having a hollow structure; the piezoelectric ceramic stacks are uniformly arranged at intervals along the circumferential direction of the inner supporting plate, and the thickness direction of the piezoelectric ceramic stacks is along the radial direction of the inner supporting plate and is arranged outside the inner supporting plate; Wherein, the polarization direction of the piezoelectric ceramic stack is consistent with the thickness direction of the piezoelectric ceramic stack; The outer side of the inner supporting plate is provided with a first radial limiting part and a second radial limiting part corresponding to each piezoelectric ceramic stack, wherein the first radial limiting part and the second radial limiting part are used for limiting two end parts of the piezoelectric ceramic stacks in the thickness direction respectively; When the transducer works, the piezoelectric ceramic stack which is pre-compressed and fixed is excited by an alternating electric field to generate telescopic deformation along the thickness direction of the piezoelectric ceramic stack, and the deformation drives the inner support plate to