An array piezoelectric ceramic transducer

Abstract

The present invention discloses an array piezoelectric ceramic transducer, comprising: an outer polarity brass shell, the space inside of which is a receiving cavity, the inner wall surface of the receiving cavity is a polygonal structure, and the adjacent first straight sides of the polygonal structure are connected by an inward concave arc transition; an inner polarity polygonal brass column formed by one-time pressing and sintering, which is placed in the middle of the receiving cavity, and a mounting hole is opened in the middle of the inner polarity polygonal brass column; a magnetostrictive waveguide wire, which is bonded to the hole wall of the mounting hole through an insulating filling glue; a plurality of rectangular piezoelectric ceramic sheets, and the two long sides of each rectangular piezoelectric ceramic sheet are respectively bonded to the first straight side of the receiving cavity and the second straight side of the inner polarity polygonal brass column through conductive silver glue, and the short sides of two adjacent rectangular piezoelectric ceramic sheets are bonded through the gap between the two and the anti-stress insulating filling glue in the inward concave arc. The transducer has a simple structure, a firm structure, easy ceramic sheet forming, a large volume, and a large output charge.

Description

Technical Field

[0001] The invention relates to the technical field of transducers, and more particularly to an array piezoelectric ceramic transducer used in testing the fluctuation transmission signal of a magnetostrictive liquid level gauge. Background Art

[0002] A transducer is a device that converts electrical energy, mechanical energy or acoustic energy from one form of energy to another. Commonly used piezoelectric ceramic structures have certain disadvantages: First, the contact surface between the ceramic sheet and the internal polarity and the external polarity is not vertical, but usually the contact between the arc and the straight edge, and the conductive silver glue is used for fixed connection. The connection point is not strong enough and the force is not uniform enough; second, usually 12 corresponding ceramic sheets are connected in series, and there are too many ceramic sheets in series, which makes the unit volume of the ceramic sheet too small and the effective volume too small; third, the seamless connection between the ceramic sheets makes the forming process too difficult. Each 2mm wide ceramic needs to be finely ground into a 30-degree or 45-degree angle, and at the same time, it needs to be bonded like a tile with precision seamless glue, which makes the forming complex and the yield rate low; fourth, the stress surface of the ceramic sheet is uneven, and the arc stress and bevel angle stress (30 degrees or 45 degrees) from many aspects make the piezoelectric ceramic sheet prone to failure when the charge is superimposed.

[0003] Therefore, how to provide an array piezoelectric ceramic transducer with a simple structure, strong structure, easy ceramic sheet molding, large volume, and large output charge is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present invention provides an array piezoelectric ceramic transducer with simple structure, firm structure, easy ceramic sheet forming, large volume and large output charge.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] An array piezoelectric ceramic transducer, comprising:

[0007] An outer polarity brass shell, wherein the space inside the outer polarity brass shell is a receiving cavity, the inner wall surface of the receiving cavity is a polygonal structure, and two adjacent first straight sides of the polygonal structure are connected by an inner concave arc transition;

[0008] An inner-polarity polygonal brass column, which is formed by one-time pressing and sintering, is placed in the middle of the accommodating cavity, and a mounting hole is opened in the middle of the inner-polarity polygonal brass column;

[0009] A magnetostrictive waveguide wire, the magnetostrictive waveguide wire runs through the mounting hole and is bonded to the hole wall of the mounting hole by an insulating filling glue;

[0010] A rectangular piezoelectric ceramic sheet, wherein there are multiple rectangular piezoelectric ceramic sheets, and the two long sides of each rectangular piezoelectric ceramic sheet are respectively bonded to the first straight side of the accommodating cavity and the second straight side of the inner polar polygonal brass column by conductive silver glue, and the short sides of two adjacent rectangular piezoelectric ceramic sheets are bonded by filling the gap between the two and the anti-stress insulating filling glue in the concave arc.

[0011] Through the above technical solutions, it can be known that compared with the prior art, the present invention discloses an array piezoelectric ceramic transducer. Firstly, it makes full use of the advantages of brass that it is easy to shape and has high precision during precision casting, and produces an external polarity brass shell and an internal polarity polygonal brass column. In addition, the setting of the inner concave arc not only realizes the stress relief of the arc angle but also facilitates the filling of anti-stress filling glue. Secondly, the rectangular piezoelectric ceramic sheet can be pressed and sintered once and directly pressed into the required ceramic size, which is easy to manufacture. In addition, the forces on the long and short sides of the rectangular piezoelectric ceramic sheet are Vertical force is applied to ensure uniform and complete force, and the bonding surfaces of the long and short sides of the rectangular piezoelectric ceramic piece are both flat, which can maximize the shear strength and durability of the transducer after bonding and ensure stable bonding. Finally, multiple piezoelectric ceramic pieces are arranged in a symmetrical array, and a special intermittent series structure is formed by anti-stress filling glue. When the magnetostrictive waveguide wire in the center of the piezoelectric ceramic transducer rotates and the rectangular piezoelectric ceramic piece is subjected to force, multiple rectangular piezoelectric ceramic pieces output electric charges, which can generate a charge potential difference between the outer polarity brass shell and the inner polarity polygonal brass column.

[0012] Furthermore, the number of sides of the polygonal structure, the number of sides of the inner polar polygonal brass column, and the number of the rectangular piezoelectric ceramic sheets are 4, 6, or 8.

[0013] Furthermore, the number of sides of the polygonal structure, the number of sides of the inner polar polygonal brass column, and the number of the rectangular piezoelectric ceramic sheets are 6. The number of rectangular piezoelectric ceramic sheets can be reduced from the traditional 12 to 6, which not only increases the volume of the rectangular piezoelectric ceramic sheets, but also increases the charge unit volume by 1 times, and the output charge is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0015] Figure 1 The accompanying drawing is a schematic structural diagram of an array piezoelectric ceramic transducer provided by the present invention.

[0016] Figure 2 The attached figure is a schematic diagram of the structure of the outer polarity brass shell. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0018] See also Figure 1-Figure 2 , an embodiment of the present invention discloses an array piezoelectric ceramic transducer, comprising:

[0019] An outer polarity brass shell 1, the space inside the outer polarity brass shell 1 is a receiving cavity 101, the inner wall surface of the receiving cavity 101 is a polygonal structure, and two adjacent first straight sides 1011 of the polygonal structure are transitionally connected by an inner concave arc 1012;

[0020] The inner polar polygonal brass column 2 is formed by one-time pressing and sintering, and is placed in the middle of the accommodating cavity 101. A mounting hole 201 is opened in the middle of the inner polar polygonal brass column 2;

[0021] A magnetostrictive waveguide wire 3, which runs through the mounting hole 201 and is bonded to the hole wall of the mounting hole 201 by an insulating filling glue 4;

[0022] A rectangular piezoelectric ceramic sheet 5, wherein there are multiple rectangular piezoelectric ceramic sheets 5, and the two long sides 501 of each rectangular piezoelectric ceramic sheet 5 are respectively bonded to the first straight side 1011 of the accommodating cavity 101 and the second straight side 202 of the inner polar polygonal brass column 2 through a conductive silver glue 6, and the short sides 502 of two adjacent rectangular piezoelectric ceramic sheets 5 are bonded through an anti-stress insulating filling glue 7 filled in the gap between the two and the concave arc 1012.

[0023] Among them, the number of sides of the polygonal structure, the number of sides of the inner polar polygonal brass column 2, and the number of rectangular piezoelectric ceramic sheets are 4, 6, or 8, preferably 6.

[0024] The array piezoelectric ceramic transducer of the present invention, firstly, makes full use of the advantages of brass that it is easy to shape and has high precision during precision casting, and produces an outer polarity brass shell and an inner polarity polygonal brass column, and the setting of the inner concave arc can not only eliminate stress but also facilitate filling with anti-stress filling glue; secondly, the rectangular piezoelectric ceramic piece can be pressed and sintered once, and can be directly pressed into the required ceramic size, which is easy to manufacture; and the force on the long side and the short side of the rectangular piezoelectric ceramic piece is vertical, so that the force is uniform and complete, and the bonding surfaces of the long side and the short side of the rectangular piezoelectric ceramic piece are both flat bonding, which can make the transducer bonded The shear strength and durability after bonding reach the highest, and the bonding is firm; finally, multiple piezoelectric ceramic sheets are arranged in a symmetrical array, and a special intermittent series structure is formed by anti-stress filling glue. When the magnetostrictive waveguide wire in the center of the piezoelectric ceramic transducer rotates and the rectangular piezoelectric ceramic sheet is subjected to force, multiple rectangular piezoelectric ceramic sheets all output electric charges, which can generate a charge potential difference between the outer polarity brass shell and the inner polarity polygonal brass column, and the number of rectangular piezoelectric ceramic sheets can be reduced from the traditional 12 to 6, which not only increases the volume of the rectangular piezoelectric ceramic sheet, but also increases the charge per unit volume by 1 times, and has a large output charge.

[0025] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0026] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An array piezoelectric ceramic transducer, characterized in that: include: An external polarity brass shell (1), wherein the space inside the external polarity brass shell (1) is a receiving cavity (101), the inner wall surface of the receiving cavity (101) is a polygonal structure, and two adjacent first straight sides (1011) of the polygonal structure are transitionally connected by an inward concave arc (1012); An inner polar polygonal brass column (2), the inner polar polygonal brass column (2) is formed by one-time pressing and sintering, and is placed in the middle of the accommodating cavity (101); a mounting hole (201) is provided in the middle of the inner polar polygonal brass column (2); A magnetostrictive waveguide wire (3), wherein the magnetostrictive waveguide wire (3) runs through the mounting hole (201) and is bonded to the hole wall of the mounting hole (201) via an insulating filling glue (4); A rectangular piezoelectric ceramic sheet (5), wherein the rectangular piezoelectric ceramic sheets (5) are in plurality, and the two long sides (501) of each rectangular piezoelectric ceramic sheet (5) are respectively bonded to the first straight side (1011) of the accommodating cavity (101) and the second straight side (202) of the inner polar polygonal brass column (2) by means of a conductive silver glue (6), and the short sides (502) of two adjacent rectangular piezoelectric ceramic sheets (5) are bonded by means of a stress-resistant insulating filling glue (7) filled in a gap between the two and in the inner concave arc (1012).

2. The array piezoelectric ceramic transducer according to claim 1, characterized in that: The number of sides of the polygonal structure, the number of sides of the inner polar polygonal brass column (2), and the number of the rectangular piezoelectric ceramic sheets are 4, 6, or 8.

3. The array piezoelectric ceramic transducer according to claim 1, characterized in that: The number of sides of the polygonal structure, the number of sides of the inner polar polygonal brass column (2), and the number of the rectangular piezoelectric ceramic sheets (5) are six.

Images