CN218013898U

CN218013898U - Ultrasonic transducer adopting laminated lead-free piezoelectric ceramic

Info

Publication number: CN218013898U
Application number: CN202221933472.9U
Authority: CN
Inventors: 龚文; 吴超峰; 朱嘉劲
Original assignee: Tongxiang Qingfeng Technology Co ltd
Current assignee: Tongxiang Qingfeng Technology Co ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-12-13
Anticipated expiration: 2032-07-26

Abstract

The utility model relates to an adopt no lead piezoelectric ceramic's of stromatolite ultrasonic transducer, including front bezel, back seat, fixing bolt and ultrasonic wave emergence portion, the front bezel the back seat all is equipped with and runs through-hole wherein, fixing bolt concatenates back seat, ultrasonic wave emergence portion and front bezel in proper order, ultrasonic wave emergence portion is including stacking in proper order and the centre is equipped with the first electrode slice of through-hole, range upon range of piezoelectric ceramic, second electrode slice, still includes the insulating layer that sets up respectively between ultrasonic wave emergence portion and front bezel, the back seat, still includes the insulating cover that sets up between ultrasonic wave emergence portion and the fixing bolt. The insulating layer and the insulating sleeve solve the potential leakage hazard and improve the safety during operation. The laminated piezoelectric ceramic reduces interface resistance and loss, reduces impedance of a transducer, improves electromechanical conversion efficiency, and indirectly improves cleaning effect, wherein the piezoelectric ceramic laminated material is a potassium-sodium niobate-based or sodium bismuth titanate-based or barium titanate-based lead-free piezoelectric material.

Description

Ultrasonic transducer adopting laminated lead-free piezoelectric ceramic

Technical Field

The invention relates to the field of ultrasonic transducers, in particular to an ultrasonic transducer adopting laminated lead-free piezoelectric ceramics.

Background

The ultrasonic transducer is a device which realizes the conversion between electric energy and sound energy by utilizing the piezoelectric effect or the inverse piezoelectric effect. The ultrasonic transducer has high electroacoustic conversion efficiency, so the ultrasonic transducer is widely applied to the technical field of power ultrasound. With piezoelectric ceramics being the most common ultrasonic transducer material.

At present, lead zirconate titanate (PZT) is used in most piezoelectric ceramic parts of ultrasonic transducers. Since PZT piezoelectric ceramics have the characteristics of high Curie temperature, strong piezoelectricity, easy doping modification, good stability and the like, the PZT piezoelectric ceramics are always the hot points of people's attention and research since the 60 s of the 20 th century and dominate in the field of piezoelectric ceramics. However, the Pb content in PZT-based ceramics exceeds 60%, which causes serious damage to human ecological environment in the processes of production, use and disposal.

Lead is a heavy metal element with neurotoxins, and is more sensitive to lead toxicity with age. Fetuses are most vulnerable to lead toxicity. Lead poisoned children grow slowly, have short seeds and are low in intelligence. According to the official data of the world health organization, more than 60 million children worldwide are retarded in intelligence development due to lead poisoning every year.

Therefore, it is desirable to provide an ultrasonic transducer using a lead-free piezoelectric ceramic to solve the above problems of the prior art.

Disclosure of Invention

To the above problem, the utility model provides an adopt no lead piezoelectric ceramic's of range upon range of formula ultrasonic transducer. The ultrasonic transducer adopts lead-free piezoelectric ceramic materials such as sodium bismuth titanate, sodium potassium niobate and the like; the integral performance of the device is improved by adopting the laminated piezoelectric ceramic.

In order to achieve the technical effects, the utility model discloses a technical scheme be:

an ultrasonic transducer using a laminated lead-free piezoelectric ceramic, comprising: front bezel, back seat, fixing bolt and ultrasonic wave emergence portion, the front bezel the back seat all is equipped with and runs through-hole wherein, fixing bolt concatenates back seat, ultrasonic wave emergence portion and front bezel in proper order, ultrasonic wave emergence portion is including stacking in proper order and the centre is equipped with first electrode slice, range upon range of piezoceramics, the second electrode slice of through-hole, still includes the insulating layer that sets up respectively between ultrasonic wave emergence portion and front bezel, the back seat, still includes the insulating cover that sets up between ultrasonic wave emergence portion and the fixing bolt.

Furthermore, the rear seat is made of structural steel or epoxy-tungsten powder and the like.

Further, the thickness of the insulating layer is 0.3-1.5 mm, and the diameter of the insulating layer is 80-100% of the diameter of the outer circle of the ultrasonic generating part.

Further, the material of the insulating layer is a glass fiber board or an epoxy board or other organic insulating materials.

Further, the laminated piezoelectric ceramic is composed of three parts of an inner electrode, an outer electrode and a piezoelectric ceramic single layer of which the number is (2n + 1) layers; the single-layer thickness of the piezoelectric ceramic is 20 to 50mm.

Further, the piezoelectric ceramic sheet material is a potassium sodium niobate-based or bismuth sodium titanate-based or barium titanate-based lead-free piezoelectric material.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: the lead-free piezoelectric ceramic material is adopted, so that the problem of harm to the environment and human bodies is solved; by laminating the piezoelectric ceramics, the interface resistance and loss are reduced, the impedance of the transducer is reduced, the electromechanical conversion efficiency is improved, and the cleaning effect is indirectly improved. Through the insulating part that sets up between two electrode slices and protecgulum, hou gai, solved ultrasonic transducer uninsulation and the electric leakage risk that the earthing is bad brings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a perspective view of the present invention;

FIG. 2 is an exploded view of the present invention;

fig. 3 is a sectional view of the laminated piezoelectric ceramic of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 3, an ultrasonic transducer using a laminated lead-free piezoelectric ceramic includes: front seat 1, back seat 2, insulating piece 3, ultrasonic wave generation portion 4, insulating cover 5 and fixing bolt 6.

Referring to fig. 2, the front seat 1 and the rear seat 2 are both provided with through holes penetrating through the upper and lower surfaces thereof, and the fixing bolt 6 is sequentially connected in series with the front seat 1, the insulating sheet 3, the ultrasonic wave generating part 4 and the rear seat 2. An insulating sleeve 5 is arranged outside the fixing bolt 6. The ultrasonic wave generating section 4 includes a first electrode sheet 41, a laminated piezoelectric ceramic 42, and a second electrode sheet 43, which are stacked in this order and have a through hole in the middle. An insulating layer 3 is arranged between the ultrasonic generation part 4 and the front seat 1 and the rear seat 2, the ultrasonic generation part 4 is isolated from other parts, the electric leakage risk caused by the front seat 1, the rear seat 2 and the fixing bolt 6 is avoided, and therefore non-conductive non-metallic materials can be considered as the materials of the front cover 1, the rear cover 2 and the fixing bolt 6.

Referring to fig. 3, the laminated piezoelectric ceramic is composed of a laminated sintered body 421 and external electrodes 422 (422 a, 422 b) formed of a conductive material such as Ag formed on both end faces of the laminated sintered body 1. The laminated sintered body 421 is obtained by alternately laminating and sintering piezoelectric ceramic layers and internal electrodes 423 (423 a to 423 f) made of a conductive material. In the multilayer sintered body 421, one ends of the

internal electrodes

423a, 423c, and 423e are connected to the external electrode 422a, and one ends of the internal electrodes 3b, 3d, and 3f are connected to the other external electrode 422 b.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An ultrasonic transducer using a laminated lead-free piezoelectric ceramic, comprising: front bezel, back seat, fixing bolt and ultrasonic wave emergence portion, the front bezel the back seat all is equipped with and runs through-hole wherein, fixing bolt concatenates back seat, ultrasonic wave emergence portion and front bezel in proper order, ultrasonic wave emergence portion is including stacking in proper order and the centre is equipped with first electrode slice, range upon range of piezoceramics, the second electrode slice of through-hole, still includes the insulating layer that sets up respectively between ultrasonic wave emergence portion and front bezel, the back seat, still includes the insulating cover that sets up between ultrasonic wave emergence portion and the fixing bolt.

2. The ultrasonic transducer using the laminated lead-free piezoelectric ceramic as claimed in claim 1, wherein the back mount is made of structural steel or epoxy-tungsten powder.

3. The ultrasonic transducer using the laminated lead-free piezoelectric ceramic according to claim 1, wherein the thickness of the insulating layer is 0.3 to 1.5mm, and the diameter is 80% to 100% of the diameter of the outer circumference of the ultrasonic wave generating part.

4. The ultrasonic transducer using the laminated lead-free piezoelectric ceramic according to claim 3, wherein the material of the insulating layer is a glass fiber plate or an epoxy plate.

5. The ultrasonic transducer using laminated lead-free piezoelectric ceramic according to claim 1, wherein the laminated piezoelectric ceramic is composed of three parts of an inner electrode, an outer electrode and a piezoelectric ceramic single layer of (2n + 1) layers; the single-layer thickness of the piezoelectric ceramic is 20 to 50mm.

6. The ultrasonic transducer using the laminated lead-free piezoelectric ceramic according to claim 1, wherein the laminated piezoelectric ceramic material is a potassium sodium niobate-based or bismuth sodium titanate-based or barium titanate-based lead-free piezoelectric material.