A new type of piezoelectric transducer
By using a combined design of insulating sheet and prestressed sheet in piezoelectric sheet transducer, the problem of insufficient power capacity, strength and stability of piezoelectric sheet transducer in small ultrasonic equipment is solved, and a higher Compressive strength, swelling resistance and heat dissipation performance reduces failure rate and power limits.
Patent Information
- Application Number
- CN202010224336.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-03-26
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2040-03-26
AI Technical Summary
Existing piezoelectric sheet transducers have shortcomings in power capacity, strength and stability, especially in small ultrasonic devices, which are difficult to meet the needs of efficient cleaning.
A new type of piezoelectric sheet transducer design including insulating sheets, piezoelectric ceramic sheets and prestressed sheets is isolated between the negative electrodes of the piezoelectric ceramic sheets and the metal groove body. The prestressed sheets are made of hard or metal. Made of material, prestressing is applied to the piezoelectric ceramic sheet, limiting its vibration displacement and expansion, and enhancing its strength and stability.
The compressive strength and swelling resistance of piezoelectric ceramic sheets are improved, the failure rate of ceramic sheets is reduced, the stability and power capacity are enhanced, and the heat dissipation is promoted through prestressed sheets of metal materials is improved, and the overall performance of the equipment is improved.
Smart Images
Figure CN111451119B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ultrasonic cleaning, and in particular to a novel piezoelectric transducer. Background Art
[0002] Transducer refers to a device that converts electrical energy into sound energy. There are two main types of transducers commonly found in the cleaning industry: 1. Piezoelectric ceramic sheet + insulating sheet assembly; 2. Cleaning transducer + insulating sheet (the cleaning transducer is composed of a front cover, ceramic sheet, electrode sheet and rear cover connected by a central screw). The former is small in size and thin in thickness, suitable for micro or small ultrasonic equipment, and is generally called a piezoelectric transducer; the latter is large in size and mainly suitable for medium and large ultrasonic equipment, and is generally called an ultrasonic transducer or vibrator.
[0003] Piezoelectric transducers are mainly used in various small cleaning machines. They use the radial vibration or thickness vibration of the piezoelectric ceramic to generate ultrasonic vibrations of a certain frequency, and use the cavitation effect produced by ultrasonic vibrations to achieve the purpose of cleaning various stains.
[0004] Currently, the industry usually uses ceramic sheets + insulating sheets for cleaning machines with lower power and smaller volume requirements. The main consideration is the insulation problem, but there is still room for breakthroughs in the power capacity, strength and stability of piezoelectric transducers. Summary of the invention
[0005] In view of the above situation, it is necessary to provide a new piezoelectric transducer with high strength and strong stability.
[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a new piezoelectric sheet transducer, which is bonded to a metal slot body, and includes an insulating sheet, a piezoelectric ceramic sheet and a prestressed pressing sheet stacked and connected in sequence, the insulating sheet is isolated between the negative electrode of the piezoelectric ceramic sheet and the metal slot body, and the prestressed pressing sheet applies prestress to the piezoelectric ceramic sheet.
[0007] Furthermore, the insulating sheet, the piezoelectric ceramic sheet and the prestressed pressing sheet are sequentially glued and connected.
[0008] Furthermore, the insulating sheet is fixedly attached to the metal trough body.
[0009] Furthermore, the prestressed pressing sheet is made of hard material.
[0010] Furthermore, the prestressed pressing sheet is made of metal material.
[0011] Furthermore, the piezoelectric ceramic sheet is a circular sheet, and the insulating sheet and the prestressed pressing sheet are circular sheets concentric with the piezoelectric ceramic sheet.
[0012] Furthermore, the piezoelectric ceramic sheet is a square sheet, and the insulating sheet and the prestressed pressing sheet are correspondingly square sheets.
[0013] Furthermore, the insulating sheet extends out of the piezoelectric ceramic sheet to form a first extended edge.
[0014] Furthermore, the prestressed pressed sheet extends out of the piezoelectric ceramic sheet to form a second extended edge.
[0015] The beneficial effects of the present invention are as follows: the piezoelectric ceramic sheet has the characteristics of strong pressure resistance and low expansion resistance. A prestressed pressing sheet is arranged on the side of the piezoelectric ceramic sheet facing away from the insulating sheet, which can improve the strength of the piezoelectric ceramic sheet and limit the vibration displacement stroke of the piezoelectric ceramic sheet in the thickness direction. The amplitude of the piezoelectric ceramic sheet is limited, which limits the expansion of the piezoelectric ceramic sheet in the thickness direction, which can greatly reduce the failure rate of ceramic sheet cracking, improve the stability of the piezoelectric ceramic sheet, and at the same time enable the piezoelectric ceramic sheet to withstand greater power, thereby improving the power capacity of the piezoelectric ceramic sheet. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the exploded structure of a novel piezoelectric transducer according to an embodiment of the present invention;
[0017] Figure 2 It is a schematic structural diagram of a novel piezoelectric transducer according to an embodiment of the present invention.
[0018] Description of labels:
[0019] 1. Prestressed pressed sheet; 2. Piezoelectric ceramic sheet; 3. Insulating sheet. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, a novel piezoelectric transducer of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0021] See also Figure 1 and Figure 2 A novel piezoelectric transducer includes an insulating sheet 3, a piezoelectric ceramic sheet 2 and a prestressed sheet 1 stacked in sequence, wherein the insulating sheet 3 is isolated between the negative electrode of the piezoelectric ceramic sheet 2 and the metal slot body, and the prestressed sheet 1 applies prestress to the piezoelectric ceramic sheet 2.
[0022] The piezoelectric ceramic sheet 2 has the characteristics of strong pressure resistance and low expansion resistance. A prestressed pressing sheet 1 is arranged on the side of the piezoelectric ceramic sheet 2 facing away from the insulating sheet 3, which can improve the strength of the piezoelectric ceramic sheet 2 and limit the vibration displacement stroke of the piezoelectric ceramic sheet 2 in the thickness direction. The amplitude of the piezoelectric ceramic sheet 2 is limited, which limits the expansion of the piezoelectric ceramic sheet 2 along the thickness direction, which can greatly reduce the failure rate of ceramic sheet cracking and improve the stability of the piezoelectric ceramic sheet 2. At the same time, the piezoelectric ceramic sheet 2 can withstand greater power and improve the power capacity of the piezoelectric ceramic sheet 2.
[0023] As a preferred embodiment of the present invention, the insulating sheet 3, the piezoelectric ceramic sheet 2 and the prestressed sheet 1 are glued together in sequence. In particular, the glue used for gluing is insulating glue. It is convenient to directly integrate the insulating sheet 3, the piezoelectric ceramic sheet 2 and the prestressed sheet 1 into one when leaving the factory. The gluing connection is convenient and quick, and since the glue itself has a certain elasticity, the effect of the prestressed sheet 1 can be improved. Other simple methods, such as riveting and the like, can also be used. Simply, the prestressed sheet 1 forms a groove, and the insulating sheet 3 and the piezoelectric ceramic sheet 2 are arranged in the groove. The prestressed sheet 1 forms a folded edge pressed on the side of the insulating sheet 3 facing away from the piezoelectric ceramic, and the insulating sheet 3 and the piezoelectric ceramic sheet 2 are pressed in the groove.
[0024] The insulating sheet 3 is fixedly attached to the metal tank body, generally connected by insulating glue. Generally, the insulating sheet 3, the piezoelectric ceramic sheet 2 and the prestressed sheet 1 are attached to the metal tank body as a whole, or the insulating sheet 3 can be attached to the metal tank body first, and then the piezoelectric ceramic sheet 2 and the prestressed sheet 1 are attached in sequence.
[0025] As another preferred embodiment of the present invention, the insulating sheet 3 is fixedly attached to the metal slot body, and the prestressed sheet 1 is connected to the slot body through insulating glue to apply prestress to the piezoelectric ceramic sheet 2. The prestressed sheet 1 is connected to the slot body to improve the stability of the fixation.
[0026] As a preferred embodiment of the present invention, the prestressed pressed sheet 1 is made of a hard material. The hard material has high strength and can withstand the vibration of the piezoelectric ceramic sheet 2 .
[0027] In particular, the prestressed sheet 1 is made of metal material. The prestressed sheet 1 made of metal material has high strength and strong thermal conductivity, which can promote the heat dissipation of the piezoelectric ceramic sheet 2. The piezoelectric ceramic sheet 2 will generate a large amount of heat when working. Excessive heat will cause the parameters of the piezoelectric ceramic sheet 2 to change, resulting in circuit mismatch. At the same time, the heat dissipation performance will also limit the power capacity. The prestressed sheet 1 made of metal material can take into account both strength and heat dissipation performance, and can significantly increase the power capacity.
[0028] Generally, the piezoelectric ceramic sheet 2 is a circular sheet, and the insulating sheet 3 and the prestressed sheet 1 are circular sheets concentric with the piezoelectric ceramic sheet 2. The circular piezoelectric ceramic sheet 2 is a commonly used piezoelectric ceramic sheet 2, which has thickness vibration and radial vibration, and the radial vibration is generally selected as the output frequency.
[0029] Alternatively, the piezoelectric ceramic sheet 2 is a square sheet, and the insulating sheet 3 and the prestressed sheet 1 are correspondingly square sheets. The square piezoelectric ceramic sheet 2 is a new piezoelectric ceramic sheet 2, which has length vibration, width vibration and thickness vibration at the same time, and is an improvement on the circular piezoelectric ceramic sheet 2. It can be understood that the scheme of the present invention is suitable for piezoelectric ceramic sheets 2 of various shapes, and this is only an example of a preferred scheme.
[0030] Generally, the area of the insulating sheet 3 is greater than or equal to the area of the piezoelectric ceramic sheet 2, so that the insulating sheet 3 can completely cover the piezoelectric ceramic sheet 2. Preferably, the area of the insulating sheet 3 is greater than the area of the piezoelectric ceramic sheet 2, that is, the insulating sheet 3 extends out of the piezoelectric ceramic sheet 2 to form a first extended edge, thereby enhancing the insulation effect and facilitating attachment.
[0031] Generally, the area of the prestressed sheet 1 is greater than or equal to the area of the piezoelectric ceramic sheet 2, so that the prestressed sheet 1 can completely cover the piezoelectric ceramic sheet 2. Preferably, the area of the prestressed sheet 1 is greater than the area of the piezoelectric ceramic sheet 2, that is, the prestressed sheet 1 extends out of the piezoelectric ceramic sheet 2 to form a second extended edge. This makes the vibration of the prestressed sheet 1 more uniform, facilitates fixation, and can protect the edge of the piezoelectric ceramic sheet 2 to avoid edge damage.
[0032] In summary, the novel piezoelectric transducer provided by the present invention can improve the strength of the piezoelectric ceramic sheet, limit the vibration displacement stroke in the thickness direction of the piezoelectric ceramic sheet, greatly reduce the failure rate of ceramic sheet cracking, improve the stability of the piezoelectric ceramic sheet, and at the same time enable the piezoelectric ceramic sheet to withstand greater power, thereby improving the power capacity of the piezoelectric ceramic sheet; and enhancing the heat dissipation performance.
[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A new type of piezoelectric transducer, attached to a metal tank, characterized in that: It comprises an insulating sheet, a piezoelectric ceramic sheet and a prestressed sheet which are sequentially stacked and connected, wherein the insulating sheet is isolated between the negative electrode of the piezoelectric ceramic sheet and the metal slot body, and the prestressed sheet applies prestress to the piezoelectric ceramic sheet; the prestressed sheet is connected to the slot body by insulating glue to apply prestress to the piezoelectric ceramic sheet.
2. A novel piezoelectric transducer according to claim 1, characterized in that: The insulating sheet, the piezoelectric ceramic sheet and the prestressed pressing sheet are sequentially glued and connected.
3. A novel piezoelectric transducer according to claim 1, characterized in that: The insulating sheet is fixedly attached to the metal tank body.
4. A novel piezoelectric transducer according to claim 1, characterized in that: The prestressed pressing sheet is made of hard material.
5. A novel piezoelectric transducer according to claim 1, characterized in that: The prestressed pressing sheet is made of metal material.
6. A novel piezoelectric transducer according to claim 1, characterized in that: The piezoelectric ceramic sheet is a circular sheet, and the insulating sheet and the prestressed pressing sheet are circular sheets concentric with the piezoelectric ceramic sheet.
7. A novel piezoelectric transducer according to claim 1, characterized in that: The piezoelectric ceramic sheet is a square sheet, and the insulating sheet and the prestressed pressing sheet are correspondingly square sheets.
8. A novel piezoelectric transducer according to claim 1, characterized in that: The insulating sheet extends out of the piezoelectric ceramic sheet to form a first extending edge.
9. A novel piezoelectric transducer according to claim 1, characterized in that: The prestressed pressed sheet extends out of the piezoelectric ceramic sheet to form a second extended edge.
Citation Information
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