Flaky ultrasonic transducer

Abstract

The invention discloses an ultrasonic transducer structure, belongs to the technical field of transducers, and particularly relates to a sheet-shaped ultrasonic transducer which comprises a transducer assembly, a pressing nut, an insulating sleeve, a pressing plate, a container cylinder body and a locking bolt. The transducer assembly is installed at the bottom of the container cylinder body, the pressing plate is installed at the bottom of the transducer assembly, and the insulating sleeve is connected into the pressing plate and the transducer assembly in a sleeved mode. The locking bolt is fixed to the bottom of the container cylinder body, sequentially penetrates through the transducer assembly and the pressing plate and is in threaded connection with the pressing nut so as to fix the container cylinder body, the transducer assembly and the pressing plate. According to the piezoelectric ceramic transducer, the problems that a traditional piezoelectric ceramic transducer is high in longitudinal height and large in product size are solved; the problems that a traditional piezoelectric ceramic transducer is complex in manufacturing process and high in manufacturing cost are solved, meanwhile, the size and cost of the ultrasonic transducer are reduced, and the ultrasonic transducer is lighter.

Description

Technical Field

[0001] The invention discloses an ultrasonic transducer structure, belongs to the technical field of transducers, and particularly relates to a sheet-shaped ultrasonic transducer. Background Art

[0002] The working mode and working principle of piezoelectric ceramic ultrasonic transducers are mainly based on the piezoelectric effect. When an alternating voltage acts on a piezoelectric ceramic material, the material will produce mechanical vibrations, thereby converting electrical energy into mechanical energy. The frequency of this mechanical vibration is the same as the frequency of the alternating voltage, so by controlling the frequency of the alternating voltage, the frequency of the mechanical vibration can be controlled, thereby generating ultrasonic waves of a specific frequency.

[0003] How it works

[0004] Piezoelectric effect: Piezoelectric ceramics are polycrystalline ceramics sintered at high temperatures. When an external force is applied to the surface of a piezoelectric ceramic, a voltage is generated. Conversely, when a voltage is applied to the surface, a deformation is generated. The ceramic sheet that has been polarized has the "piezoelectric effect".

[0005] Conversion of electrical energy to mechanical energy: When AC voltage acts on piezoelectric ceramics, the piezoelectric effect causes the ceramics to vibrate, thereby generating ultrasonic waves. Working at the resonant frequency, the piezoelectric transducer efficiently converts electrical energy into mechanical energy (sound waves) and transmits it.

[0006] Piezoelectric ceramic ultrasonic transducers are widely used in many fields:

[0007] Cleaning: High-efficiency cleaning and precision cleaning, suitable for cleaning work in high-demand fields such as electronic components, medical equipment, and precision mechanical parts.

[0008] Detection: It is widely used in aerospace, ocean exploration, medical technology, bioengineering, mechanical engineering, flaw detection and measurement, etc.

[0009] Processing: ultrasonic welding, ultrasonic assisted processing (such as ultrasonic machine tools), ultrasonic polishing, ultrasonic precision spraying, ultrasonic screening, etc.

[0010] The piezoelectric ceramic ultrasonic transducer in the prior art has the following disadvantages:

[0011] 1. Traditional piezoelectric ceramic sheets do not have metal sheets attached to both sides, so they are prone to bending and deformation during operation, which may cause the piezoelectric ceramic sheets to break.

[0012] 2. If Figure 1 As shown, the traditional ultrasonic transducer utilizes the thickness vibration mode of the piezoelectric ceramic sheet, and its frequency is determined by the thickness of the piezoelectric ceramic sheet and the sum of the thickness of the front and rear covers. The ultrasonic transducer is relatively high (generally, the ultrasonic transducer is more than 5 cm high), which increases the cost of the ultrasonic transducer and makes it very heavy. Summary of the invention

[0013] Purpose of the invention: to provide a sheet-shaped ultrasonic transducer to solve the above-mentioned problems.

[0014] Technical solution: A sheet-shaped ultrasonic transducer, the ultrasonic transducer comprising: a transducer assembly, a clamping nut, an insulating sleeve, a pressing plate, a container cylinder and a locking bolt;

[0015] In a further embodiment, the transducer assembly is mounted on the bottom of the container cylinder, the pressure plate is mounted on the bottom of the transducer assembly, the insulating sleeve is sleeved in the pressure plate and the transducer assembly, the locking bolt is fixed to the bottom of the container cylinder and passes through the transducer assembly and the pressure plate in sequence and is screwed with the clamping nut to fix the container cylinder, the transducer assembly and the pressure plate;

[0016] The transducer assembly and the pressing plate are provided with circular holes, and the insulating sleeve is located in the circular holes of the pressing plate and the transducer assembly and cooperates with the locking bolt.

[0017] In a further embodiment, the transducer assembly includes: a piezoelectric ceramic sheet, an overlying metal sheet, and a lower overlying metal sheet;

[0018] A layer of adhesive conductive coating is printed on the upper and lower planes of the piezoelectric ceramic sheet, and the upper metal sheet and the lower metal sheet are pressurized, heated and cured to form an irreversible hardened connection with the piezoelectric ceramic sheet.

[0019] In a further embodiment, circular holes of similar sizes are formed on the piezoelectric ceramic sheet, the upper metal sheet and the lower metal sheet.

[0020] In a further embodiment, the upper metal sheet and the lower metal sheet have the same structure, and are composed of an insulating substrate, a metal skin, leads and solder joints;

[0021] The insulating substrate is made of insulating fiber resin, and one side is covered with a dense conductive metal skin through a special process. The welding point is located outside the insulating substrate, and the lead wire connects the power supply and the welding point.

[0022] In a further embodiment, the frequency of the piezoelectric ceramic piece is adjusted by changing the inner hole diameter and the outer circle diameter of the piezoelectric ceramic piece, that is:

[0023]

[0024] Among them, f represents the frequency of the piezoelectric ceramic piece, N is the frequency constant, D represents the diameter of the piezoelectric ceramic piece, and d represents the inner hole diameter of the piezoelectric ceramic piece.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention provides an upper metal sheet and a lower metal sheet on the upper and lower surfaces of the piezoelectric ceramic sheet so that the upper and lower surfaces of the piezoelectric ceramic sheet are subject to similar restrictions, so that when the piezoelectric ceramic sheet undergoes radial vibration, the deformation bending becomes smaller, thereby making the piezoelectric ceramic sheet less likely to be broken.

[0027] 2. The frequency of the piezoelectric ceramic sheet is adjusted by changing the inner and outer diameters of the piezoelectric ceramic sheet (unlike traditional ultrasonic transducers, which are adjusted by changing the thickness of the piezoelectric ceramic sheet and the height of the front and rear covers) to meet different working requirements. At the same time, it also reduces the height and cost of the ultrasonic transducer, making the ultrasonic transducer lighter and thinner.

[0028] In summary, the present invention solves the problems of high vertical height and large product volume of traditional piezoelectric ceramic transducers, and overcomes the problems of complex manufacturing process and high manufacturing cost of traditional piezoelectric ceramic transducers. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a diagram of the structure of a traditional ultrasonic transducer.

[0030] Figure 2 It is a structural diagram of the ultrasonic transducer of the present invention.

[0031] Figure 3 It is an exploded diagram of the ultrasonic transducer of the present invention.

[0032] Figure 4 Schematic diagram of a transducer assembly of the present invention.

[0033] Figure 5 It is a structural diagram of the transducer assembly of the present invention.

[0034] Figure 6 is an exploded view of the transducer assembly of the present invention.

[0035] Figure 7 It is a schematic diagram of the piezoelectric ceramic sheet of the present invention.

[0036] Figure numerals: transducer assembly 1, clamping nut 2, insulating sleeve 3, pressure plate 4, container cylinder 5, locking bolt 6, piezoelectric ceramic sheet 7, upper metal sheet 8, lower metal sheet 9, conductive coating layer 10, circular hole 11, insulating substrate 12, metal skin 13, lead 14, solder joint 15. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] A sheet-shaped ultrasonic transducer comprises: a transducer assembly 1, a clamping nut 2, an insulating sleeve 3, a pressing plate 4, a container cylinder 5, and a locking bolt 6.

[0039] In one embodiment, Figures 2 to 7 As shown, the transducer assembly 1 is installed at the bottom of the container cylinder 5, the pressing plate 4 is installed at the bottom of the transducer assembly 1, the insulating sleeve 3 is sleeved in the pressing plate 4 and the transducer assembly 1, the locking bolt 6 is fixed to the bottom of the container cylinder 5 and passes through the transducer assembly 1 and the pressing plate 4 in sequence and is screwed with the pressing nut 2 to fix the container cylinder 5, the transducer assembly 1 and the pressing plate 4;

[0040] The transducer assembly 1 and the pressing plate 4 are provided with circular holes 11 , and the insulating sleeve 3 is located in the circular holes 11 of the pressing plate 4 and the transducer assembly 1 and cooperates with the locking bolt 6 .

[0041] In one embodiment, Figures 2 to 7 As shown, the transducer assembly 1 comprises: a piezoelectric ceramic sheet 7, an upper metal sheet 8 and a lower metal sheet 9;

[0042] A layer of adhesive conductive coating layer 10 is printed on the upper and lower surfaces of the piezoelectric ceramic sheet 7 , and the upper metal sheet 8 and the lower metal sheet 9 are pressurized, heated and cured to form an irreversible hardened connection with the piezoelectric ceramic sheet 7 .

[0043] In one embodiment, Figures 2 to 7 As shown, the piezoelectric ceramic sheet 7, the upper metal sheet 8 and the lower metal sheet 9 are provided with circular holes 11 of the same size.

[0044] In one embodiment, Figures 2 to 7 As shown, the upper metal sheet 8 and the lower metal sheet 9 have the same structure, and are composed of an insulating substrate 12, a metal skin 13, a lead 14 and a solder joint 15;

[0045] The insulating substrate 12 is made of insulating fiber resin, and one side is covered with a dense conductive metal layer 13 by a special process. The solder joint 15 is located outside the insulating substrate 12 , and the lead wire 14 connects the power supply and the solder joint 15 .

[0046] In one embodiment, Figures 2 to 7As shown, the frequency of the piezoelectric ceramic sheet 7 is adjusted by observing the diameters of the circular holes 11 on the piezoelectric ceramic sheet 7, the upper metal sheet 8 and the lower metal sheet 9, that is:

[0047]

[0048] Wherein, f represents the frequency of the piezoelectric ceramic piece 7 , N represents the frequency constant, D represents the diameter of the piezoelectric ceramic piece 7 , and d represents the diameter of the circular hole 11 of the piezoelectric ceramic piece 7 .

[0049] In one embodiment, Figures 2 to 7 As shown, the ultrasonic transducer assembly 1 of the invention (hereinafter referred to as the transducer sheet) is composed of an upper metal plate, a hollow piezoelectric ceramic sheet 7, a lower metal plate and positive and negative electrode leads 14. The differences in its structure and function from existing similar transducers are described in detail as follows:

[0050] The base material of the upper metal plate and the lower metal plate is made of insulating fiber resin, one side of which is covered with a layer of dense conductive metal through a special process.

[0051] As section Figure 5 and decomposition Figure 6 As shown, the innovative transducer consists of three parts: an upper metal plate, a piezoelectric ceramic sheet 7 (piezoelectric ceramic material) and a lower metal plate; wherein a very thin layer of adhesive conductive coating layer 10 is printed on two flat surfaces of the piezoelectric ceramic, and the upper metal plate and the lower metal plate are pressurized, heated and cured to form an irreversible hardened connection with the piezoelectric ceramic.

[0052] Working principle: The transducer assembly 1 is bonded and cured on the bottom (or side) of the cleaning container cylinder 5, and a locking bolt 6 is welded on the bottom of the cylinder. Under the positioning constraint of the insulating sleeve 3, the pressure plate 4 is pressed by the nut to solidly connect the transducer assembly 1 and the container cylinder 5; after the transducer assembly is energized, the high-frequency electrical energy is converted into mechanical vibration and transmitted to the container cylinder 5, and the container cylinder 5 transmits the high-frequency vibration to the cleaning liquid in the cylinder container, so that the parts immersed in the cleaning liquid can be cleaned.

[0053] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A sheet-shaped ultrasonic transducer, characterized in that: The ultrasonic transducer comprises: a transducer assembly, a clamping nut, an insulating sleeve, a pressing plate, a container cylinder and a locking bolt; The transducer assembly is mounted on the bottom of the container cylinder, the pressing plate is mounted on the bottom of the transducer assembly, the insulating sleeve is sleeved in the pressing plate and the transducer assembly, the locking bolt is fixed to the bottom of the container cylinder and passes through the transducer assembly and the pressing plate in sequence and is screwed with the clamping nut to fix the container cylinder, the transducer assembly and the pressing plate; The transducer assembly and the pressing plate are provided with circular holes, and the insulating sleeve is located in the circular holes of the pressing plate and the transducer assembly and cooperates with the locking bolt.

2. A sheet-shaped ultrasonic transducer according to claim 1, characterized in that: The transducer assembly comprises: a piezoelectric ceramic sheet, an upper metal sheet and a lower metal sheet; A layer of adhesive conductive coating is printed on the upper and lower planes of the piezoelectric ceramic sheet, and the upper metal sheet and the lower metal sheet are pressurized, heated and cured to form an irreversible hardened connection with the piezoelectric ceramic sheet.

3. A sheet-shaped ultrasonic transducer according to claim 2, characterized in that: The piezoelectric ceramic sheet, the upper metal sheet and the lower metal sheet are provided with circular holes of similar sizes.

4. A sheet-like ultrasonic transducer according to claim 2, characterized in that: The upper metal sheet and the lower metal sheet have the same structure, and are composed of an insulating substrate, a metal sheet, leads and solder joints; The insulating substrate is made of insulating fiber resin, and one side is covered with a dense conductive metal sheet through a special process. The welding point is located outside the insulating substrate, and the lead wire connects the power supply and the welding point.

5. The sheet-shaped ultrasonic transducer according to claim 2, characterized in that: The frequency of the piezoelectric ceramic piece is adjusted by changing the inner hole diameter and the outer circle diameter of the piezoelectric ceramic piece, that is: Among them, f represents the frequency of the piezoelectric ceramic piece, N is the frequency constant, D represents the outer diameter of the piezoelectric ceramic piece, and d represents the inner hole diameter of the piezoelectric ceramic piece.

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