Bidirectional multi-stage parallel bending disk transducer

Abstract

The present invention relates to the field of transducer technology, and provides a bidirectional multi-stage parallel curved disk transducer, comprising a first radiation cover plate and a second radiation cover plate arranged opposite to each other, wherein a first radiation end is provided on the first radiation cover plate, and a first telescopic column is provided on the inner side of the first radiation end; a second radiation end is provided on the second radiation cover plate in a direction opposite to the radiation direction of the first radiation end, and a second telescopic column is provided on the inner side of the second radiation end; multiple groups of metal curved disks are connected in series along the axial direction on both the first telescopic column and the second telescopic column, and the piezoelectric ceramic sheets are arranged on the metal curved disks, and the outer edges of adjacent metal curved disks are axially connected. The metal curved disks of the transducer adopt a driving mode of multi-stage parallel piezoelectric curved disks, and compared with the transducers in the prior art, under the same frequency conditions, the transducer has higher power capacity and higher pressure resistance.

Description

Technical Field

[0001] The invention relates to the technical field of transducers, in particular to a bidirectional multi-stage parallel curved disk transducer. Background Art

[0002] With the technological breakthroughs of hydroacoustic systems and equipment year by year, the application scenarios and importance of hydroacoustic systems are gradually increasing. The new competition of underwater forces requires hydroacoustic systems to focus on solving problems such as long-distance communication, low-noise target recognition, and low-echo characteristic target detection. Low-frequency hydroacoustic systems are an important direction for the development of underwater forces.

[0003] As a key technology of low-frequency underwater acoustic system, low-frequency transducer technology has two important development directions:

[0004] One is the use of low-frequency, high-power and broadband, whose goal is to radiate low-frequency sound energy into the water to the greatest extent possible. In order to increase the sound source level, this type of transducer array is usually large in size and is mainly used in various types of large-scale active detection sonars on ships and shores. The lower the frequency and the greater the sound power, the stronger the underwater long-range detection capability can be obtained. The LFA large-scale low-frequency sound source array carried by the US Navy's "Impeccable" hydroacoustic survey ship weighs more than ten tons and can actively detect Fuwa submarines 130 kilometers away.

[0005] Another important development direction is the development direction of light, broadband, high efficiency and low frequency. Among various hydroacoustic and hydroacoustic countermeasure equipment and systems, most of the low-frequency sound sources are more or less restricted by platform space, load, energy and other conditions during the installation process, such as aviation dipping sonar, active buoy sonar, torpedo warning sonar active towed array, hydroacoustic transponder, hydroacoustic communication, hydroacoustic target simulator, acoustic bait, hydroacoustic jamming equipment, etc. These hydroacoustic equipment and systems are the hot spots in the current hydroacoustic field and are more widely used. They have an urgent need for small, light, low-frequency, broadband, high-efficiency and high-power sound sources.

[0006] like Figure 5As shown, it is the structure of the transducer in the prior art, wherein Figure a is a symmetrical double-laminated curved disc transducer. The air-backed double-laminated curved disc transducer with a symmetrical structure has been studied. This type of transducer has the characteristics of small size, low frequency, high efficiency, etc., and is suitable for engineering, but it has the disadvantage of low pressure resistance and cannot be used in deep water fields; Figure b is a pressure-resistant curved disc transducer with an overflow cavity. The transducer introduces seawater through the overflow port to achieve internal and external pressure balance, greatly improving the pressure resistance of the transducer. However, since the internal air cavity is replaced by seawater, the load of the transducer is reduced. In the prior art, the diameter of the disc transducer is generally reduced to obtain a higher strength. Due to the reduction in the diameter of the transducer, the low-frequency performance of the transducer is reduced. Therefore, it is necessary to design a transducer with a new structure that can obtain a lower frequency and ensure the pressure resistance of the transducer. Summary of the invention

[0007] The technical problem to be solved by the present invention is: in order to overcome the deficiency of the low-frequency transducer in the prior art that cannot take into account both the frequency and intensity effects, the present invention provides a bidirectional multi-stage parallel curved disc transducer, which has the characteristics of miniaturization, light weight, high power and high compressive resistance.

[0008] The technical solution adopted by the present invention to solve the technical problem is: a bidirectional multi-stage parallel curved disk transducer, comprising a first radiation cover plate and a second radiation cover plate arranged opposite to each other, and both of which are provided with a cavity for accommodating a piezoelectric ceramic sheet, wherein a first radiation end is provided on the first radiation cover plate, a first telescopic column is provided on the inner side of the first radiation end, and the first telescopic column is located in the cavity of the first radiation cover plate; a second radiation end is provided on the second radiation cover plate in a radiation direction opposite to the first radiation end, a second telescopic column is provided on the inner side of the second radiation end, and the second telescopic column is located in the cavity of the second radiation cover plate; multiple groups of metal curved disks are connected in series along the axial direction on the first telescopic column and the second telescopic column, and the piezoelectric ceramic sheet is arranged on the metal curved disk, and the outer edges of adjacent metal curved disks are axially connected. The outer edges of the metal curved disks are axially connected in sequence, and the pressure resistance strength thereof is increased without changing the frequency of the transducer, and the requirements of low-frequency high power and pressure resistance can be met at the same time. Two radiation ends with opposite radiation directions are provided to meet the needs of bidirectional radiation. The nodal plane is the zero point of the vibration amplitude. The first radiating end and the second radiating end are symmetrical along the nodal plane and have opposite vibration directions. The axial deformation at the node of the nodal plane is zero and can be fixed to the shell to ensure relative stability between the shell and the folded structure without affecting the symmetrical energy output.

[0009] Furthermore, the outer edges of the first radiation end and the second radiation end are folded toward each other to form a first radiation end shell and a second radiation end shell, respectively, and the first radiation end shell and the second radiation end shell are connected by a telescopic member. When in use, the internal piezoelectric ceramic will produce axial deformation under the stimulation of the electrical signal, so a telescopic member is used to connect the first radiation end shell and the second radiation end shell to ensure the axial deformation freedom. The two shells together enclose a cavity for accommodating the piezoelectric ceramic sheet.

[0010] Specifically, it also includes a simply supported ring connector, through which the outer edges of the adjacent metal curved discs are axially connected. The simply supported ring connector is made of high-strength metal, such as titanium alloy, stainless steel, aluminum and other materials.

[0011] Furthermore, a first conical portion is provided on the side where the first radiation end is connected to the first telescopic column, and a small end of the first conical portion is connected to the first telescopic column; a second conical portion is provided on the side where the second radiation end is connected to the second telescopic column, and a small end of the second conical portion is connected to the second telescopic column. The radiation end is configured as a conical structure, which can increase the rigidity and radiation area of ​​the energy radiation end, improve the radiation characteristics, and make the radiation more uniform.

[0012] Furthermore, to avoid mutual influence between the two radiating ends, the opposite ends of the first telescopic column and the second telescopic column are separated or axially movably connected to ensure stable axial deformation.

[0013] Furthermore, at least one of the upper and lower surfaces of the metal bending disk is provided with a piezoelectric ceramic sheet, and when piezoelectric ceramic sheets are provided on both sides of the metal bending disk, a certain distance is left between the upper and lower piezoelectric ceramic sheets of adjacent metal bending disks. The piezoelectric ceramic sheet can be provided on only one surface of the metal bending disk, or on both sides, to increase the driving capability, and is provided according to the need for output energy; since the metal bending disk is a parallel structure, when piezoelectric ceramic sheets are provided on both sides, the piezoelectric ceramic sheets between adjacent metal bending disks will face each other, therefore, a certain distance is left to avoid mutual interference during vibration.

[0014] Furthermore, in order to facilitate connection and deformation, the telescopic member adopts a bellows, and the bellows includes a first connection part, a telescopic part and a second connection part which are integrally connected, and the first connection part and the second connection part are respectively arranged at two ends of the telescopic part. The telescopic part can be extended and shortened along the axial direction, and the first connection part and the second connection part will not produce telescopic deformation, which is convenient for fixed connection with adjacent structures.

[0015] Furthermore, in order to improve corrosion resistance, a waterproof layer is provided on the outer sides of the first radiation cover plate, the second radiation cover plate and the corrugated tube.

[0016] The beneficial effects of the present invention are as follows: the present invention provides a bidirectional multi-stage parallel bending disk transducer, in which the metal bending disk adopts a multi-stage parallel piezoelectric bending disk driving mode. Compared with the transducers in the prior art, under the same frequency conditions, the transducer has a smaller scale, higher power capacity and higher compressive strength. In addition, the transducer can be used as an independent small low-frequency sound source, or it can be formed into an array to achieve low-frequency and high-power operation, and can even be used as a driving unit for certain types of low-frequency flextensional transducers, which is an effective supplement to the traditional low-frequency transducer driving mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic structural diagram of the best embodiment of the transducer of the present invention.

[0019] Figure 2 Schematic diagram of the structure of the first radiation cover.

[0020] Figure 3 Schematic diagram of the structure of the second radiation cover.

[0021] Figure 4 It is a schematic diagram of the structure of the bellows.

[0022] Figure 5 It is the structure of the transducer in the prior art, wherein FIG. a is a schematic diagram of the structure of a symmetrical double-laminated curved disc transducer, and FIG. b is a schematic diagram of the structure of a pressure-resistant curved disc transducer with an overflow cavity.

[0023] In the figure: 1. first radiation cover plate, 11. first radiation end, 11a. first conical portion, 12. first telescopic column, 13. first radiation end shell, 2. second radiation cover plate, 21. second radiation end, 21a. second conical portion, 22. second telescopic column, 23. second radiation end shell, 3. metal bending disk, 4. simply supported ring connector, 5. piezoelectric ceramic sheet, 6. bellows, 61. first connection portion, 62. telescopic portion, 63. second connection portion. DETAILED DESCRIPTION

[0024] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0025] like Figure 1As shown, a bidirectional multi-stage parallel bending disk transducer of the present invention comprises a first radiation cover plate 1 and a second radiation cover plate 2 arranged opposite to each other, and a piezoelectric ceramic sheet 5; the first radiation cover plate 1 and the second radiation cover plate 2 are U-shaped in cross section as a whole, and are provided with a cavity for accommodating the piezoelectric ceramic sheet 5, and materials such as titanium alloy, stainless steel, and aluminum can be selected. In this embodiment, the first radiation cover plate 1 and the second radiation cover plate 2 have the same structure and are symmetrically arranged along the section plane.

[0026] like Figure 2-Figure 3 As shown, the first radiation cover plate 1 includes a first radiation end 11 , a first telescopic column 12 and a first radiation end housing 13 , and the second radiation cover plate 2 includes a second radiation end 21 , a second telescopic column 22 and a second radiation end housing 23 .

[0027] The radiation directions of the first radiation end 11 and the second radiation end 21 are opposite. The first telescopic column 12 is arranged on the inner side of the first radiation end 11, and the first telescopic column 12 is located in the cavity of the first radiation cover plate 1; the second telescopic column 22 is arranged on the inner side of the second radiation end 21, and the second telescopic column 22 is located in the cavity of the second radiation cover plate 2; the first telescopic column 12 and the second telescopic column 22 are both axially connected in series with multiple groups of metal bending disks 3, the piezoelectric ceramic sheet 5 is arranged on the metal bending disk 3, and the outer edges of adjacent metal bending disks 3 are axially connected through a simply supported ring. It also includes a simply supported ring connector 4, and the outer edges of adjacent metal bending disks 3 are axially connected through a simply supported ring connector 4. The simply supported ring connector 4 is made of high-strength metal material, such as titanium alloy, stainless steel, aluminum and other materials.

[0028] The outer edges of the first radiation end 11 and the second radiation end 21 are folded toward each other to form the first radiation end housing 13 and the second radiation end housing 23, respectively. The first radiation end housing 13 and the second radiation end housing 23 are connected by a telescopic member. When in use, the internal piezoelectric ceramic vibrates and deforms in the axial direction. Therefore, a telescopic member is used to connect the first radiation end housing 13 and the second radiation end housing 23 to ensure axial deformation. The two housings together form a cavity for accommodating the piezoelectric ceramic sheet 5.

[0029] A first conical portion 11a is provided on one side where the first radiation end 11 is connected to the first telescopic column 12, and a small end of the first conical portion 11a is connected to the first telescopic column 12; a second conical portion 21a is provided on one side where the second radiation end 21 is connected to the second telescopic column 22, and a small end of the second conical portion 21a is connected to the second telescopic column 22. The radiation end is configured as a conical structure, which can increase the rigidity and radiation area of ​​the energy radiation end, improve the radiation characteristics, and make the radiation more uniform.

[0030] To avoid mutual influence between the two radiating ends, the first telescopic column 12 and the second telescopic column 22 have opposite ends separated or axially movably connected to ensure stable axial deformation. In this embodiment, the two telescopic columns are separated from each other, and the separation position is located at the node plane.

[0031] Piezoelectric ceramics can be arranged on the surface of only one side of the metal bending disk 3, or on both sides to increase the driving capability, and the arrangement is performed according to the need for output energy; since the metal bending disk 3 is a parallel structure, when piezoelectric ceramics are arranged on both sides, the piezoelectric ceramics between adjacent metal bending disks 3 will face each other. Therefore, in order to avoid mutual interference during vibration, a certain distance is left between the upper and lower piezoelectric ceramic sheets 5 between adjacent metal bending disks 3.

[0032] like Figure 4 As shown, the telescopic member adopts a bellows 6, which can be made of stainless steel. The bellows 6 includes a first connecting portion 61, a telescopic portion 62, and a second connecting portion 63 which are integrally connected. The first connecting portion 61 and the second connecting portion 63 are respectively arranged at both ends of the telescopic portion 62. The telescopic portion 62 can be extended and shortened along the axial direction, while the first connecting portion 61 and the second connecting portion 63 will not produce telescopic deformation, which is convenient for fixed connection with adjacent structures. In this embodiment, the inner sides of the ends of the first connecting portion 61 and the second connecting portion 63 are both provided with steps, which are respectively used to connect with the first radiation end shell 13 and the second radiation end shell 23. The outer sides of the first radiation cover plate 1, the second radiation cover plate 2 and the bellows 6 are also provided with a waterproof layer, and the waterproof layer can be made of anti-corrosion glue.

[0033] Working principle:

[0034] When an electrical signal of corresponding frequency is applied to the transducer, the piezoelectric ceramic piece 5 produces radial deformation. Since the piezoelectric ceramic piece 5 is fixed on the metal bending disc 3, it will drive the metal bending disc 3 to produce radial deformation, thereby causing the telescopic column to produce axial telescopic deformation, thereby outputting energy and realizing sound radiation.

[0035] Since the metal bending disks 3 are connected in parallel by the simply supported ring connectors 4, the radial compressive strength is improved while ensuring the low-frequency performance.

[0036] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bidirectional multi-stage parallel bending disk transducer, characterized in that: It comprises a first radiation cover plate and a second radiation cover plate which are arranged opposite to each other, wherein a first radiation end is arranged on the first radiation cover plate, and a first telescopic column is arranged on the inner side of the first radiation end; a second radiation end which is opposite to the radiation direction of the first radiation end is arranged on the second radiation cover plate, and a second telescopic column is arranged on the inner side of the second radiation end; a plurality of groups of metal bending disks are connected in series along the axial direction on the first telescopic column and the second telescopic column, and piezoelectric ceramic sheets are arranged on the metal bending disks, and the outer edges of adjacent metal bending disks are axially connected; The outer edges of the first radiation end and the second radiation end are folded toward each other to form a first radiation end shell and a second radiation end shell respectively, and the first radiation end shell and the second radiation end shell are connected by a telescopic member.

2. The bidirectional multi-stage parallel bending disk transducer according to claim 1, characterized in that: It also includes a simply supported ring connector, through which the outer edges of adjacent metal curved discs are axially connected.

3. The bidirectional multi-stage parallel bending disk transducer according to claim 1, characterized in that: A first conical portion is provided on the side where the first radiating end is connected to the first telescopic column, and a small end of the first conical portion is connected to the first telescopic column; a second conical portion is provided on the side where the second radiating end is connected to the second telescopic column, and a small end of the second conical portion is connected to the second telescopic column.

4. The bidirectional multi-stage parallel bending disk transducer according to claim 1, characterized in that: The opposite ends of the first telescopic column and the second telescopic column are separated or axially movably connected.

5. The bidirectional multi-stage parallel bending disk transducer according to any one of claims 1 to 4, characterized in that: At least one side of the upper and lower surfaces of the metal bending disk is provided with a piezoelectric ceramic sheet, and when both sides of the metal bending disk are provided with piezoelectric ceramic sheets, a certain distance is left between the upper and lower piezoelectric ceramic sheets of adjacent metal bending disks.

6. The bidirectional multi-stage parallel bending disk transducer according to claim 5, characterized in that: The telescopic member is a bellows, and the bellows includes a first connection portion, a telescopic portion, and a second connection portion that are integrally connected, and the first connection portion and the second connection portion are respectively arranged at two ends of the telescopic portion.

7. The bidirectional multi-stage parallel bending disk transducer according to claim 6, characterized in that: A waterproof layer is also provided on the outer sides of the first radiation cover plate, the second radiation cover plate and the corrugated tube.

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