A delta low frequency broadband transducer

Abstract

The present application belongs to the technical field of underwater acoustic signal detection, and particularly relates to a low-frequency wideband delta-shaped transducer, which comprises a transducer body, the transducer body comprises a support ring, a connector, a framework, a connecting wire, water-tight glue, a support plate, piezoelectric ceramics, a soldering sheet, a screw and a vulcanized rubber layer, the framework is installed in the support ring, the support plate is installed in the circular ring of the framework, the piezoelectric ceramics is installed on the support plate, the piezoelectric ceramics and the support plate are collectively referred to as a bending vibrator, the connector is symmetrically arranged at the linear segments on both sides of the support ring, the vulcanized rubber layer is arranged at the top of the inner side of the support ring, the water-tight glue is filled at the gaps between the multiple bending vibrators and the vulcanized rubber layer, the present application realizes water-tightness by the three bending vibrators and the vulcanized rubber layer, greatly simplifies the wiring form between the vibrators, simultaneously reduces the maximum external size of the transducer, and obviously expands the working bandwidth by utilizing the sound field coupling effect between the vibrators, compared with the conventional bending disc transducer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of underwater acoustic signal detection, and particularly relates to a low-frequency wideband triangular transducer. BACKGROUND

[0002] The hanging sonar system is light and compact, and is widely used in the field of underwater acoustic detection. The active hanging sonar generally only has a detection function. With the development of the underwater acoustic detection system, the requirements for platform equipment are also correspondingly improved. The hanging sonar not only needs to have the functions of detection and on-call anti-submarine, but also needs to have the ability of multi-base communication, which requires the hanging sonar transmitting array to have a relatively wide working bandwidth. The active main hanging sonar in China generally has a high transmitting source level as the target, and the working bandwidth is generally narrow, which cannot meet the communication requirements. The active hanging sonar is generally divided into a processor, a receiver, a transmitter, a hanging cable and an underwater acoustic array (including a transmitting array and a receiving array). Due to the size requirements of the installation platform, the underwater acoustic array of the low-frequency hanging sonar generally adopts a retractable structure, that is, it is expanded when used to improve the performance of the acoustic array, and it is retracted when stored to reduce the occupied space on the platform.

[0003] How to optimize the performance of the transmitting array is an urgent problem to be solved. The bending disc transducer is used in the retractable transmitting array of the active hanging sonar. When the active hanging sonar is designed, the most concerned indicators of the transmitting array are the working frequency and the transmitting source level. In order to meet the increasing detection requirements, it is expected that the working frequency of the transmitting array is lower and lower, and the transmitting source level is higher and higher, while the spatial size requirement of the transmitting array is extremely harsh. In order to meet the requirements of the working frequency, the transmitting source level and the spatial size, the retractable transmitting array is designed, which is expanded when working to improve the array gain and then improve the transmitting source level, and is retracted when stored to reduce the storage space. The bending disc transducer has a circular pie structure, small size and low frequency transmission characteristics, and is very suitable for the retractable transmitting array of the hanging sonar. However, the 3dB transmitting response bandwidth of the bending disc transducer is generally only 8%. Even if the mutual radiation is used to expand the bandwidth, it can only reach about 15% without significantly affecting the resonant frequency of the transmitting array, which still cannot effectively meet the communication bandwidth requirements. SUMMARY

[0004] The main purpose of the present application is to overcome the shortcomings of the prior art, and to provide a low-frequency wideband triangular transducer, which mainly faces the transmitting array of the hanging sonar and provides technical support for the hanging sonar to increase the communication function.

[0005] In order to achieve the above purpose, the following technical scheme is adopted in the present application.

[0006] The low-frequency wide-band triangular transducer comprises a transducer body, the transducer body comprises a supporting ring, a connector, a skeleton, a connecting wire, water-proof glue, a supporting plate, piezoelectric ceramics, a soldering sheet, a screw and a vulcanized rubber layer, the supporting ring is triangular in shape, the skeleton is provided with three circular rings connected in a triangular distribution, the skeleton is installed in the supporting ring, the supporting plate is installed in the circular ring of the skeleton, the piezoelectric ceramics are installed on the supporting plate, the piezoelectric ceramics and the supporting plate are collectively referred to as a bending vibrator, the connector is symmetrically arranged at the linear segment on both sides of the supporting ring, the vulcanized rubber layer is arranged at the top of the inner side of the supporting ring, and the water-proof glue is filled in the gap between the bending vibrator and the vulcanized rubber layer.

[0007] Preferably, the skeleton is made of titanium alloy material, and the bottom of the vulcanized rubber layer is provided with a plurality of positioning steps, and the skeleton is placed on the positioning steps.

[0008] Preferably, the supporting ring is provided with a circular arc transition at the three vertices, the circular arc is concentric with the adjacent bending vibrator inside, and the supporting ring is provided with an array element spacing interface required for forming an expanded array at the positions of the three vertex angles on the outer side of the supporting ring.

[0009] Preferably, the connecting wire is used to connect the positive and negative leads of the parallel bending vibrator and the connector, and the connecting wire is a high-voltage resistant wire.

[0010] Preferably, the connector shell is made of titanium alloy material, and the connector is a two-core, high-voltage resistant connector.

[0011] Preferably, the piezoelectric ceramics have a smaller diameter than the supporting plate, the piezoelectric ceramics are P8 piezoelectric discs, the supporting plate is made of titanium alloy material, and the supporting plate is provided with a circular step on one side.

[0012] Preferably, the water-proof glue is made of polyurethane rubber material, and the vulcanized rubber layer is made of chloroprene rubber material.

[0013] Preferably, the soldering sheet is a silver-plated single-head soldering sheet, the soldering sheet is used to weld the positive lead of the bending vibrator, the screw is an M2x5 customized titanium alloy screw, and the screw is used to fix the soldering sheet on the supporting plate of the bending vibrator.

[0014] Preferably, the output directions of the connectors are collectively directed to the linear segment on the side of the supporting ring without the connector.

[0015] Overall, compared with the prior art, the above technical scheme conceived by the present application can achieve the following beneficial effects:

[0016] The application realizes water tightness by three bending transducers from a vulcanized rubber layer, greatly simplifies the wiring form between the transducers, reduces the maximum size of the transducer, and obviously expands the working bandwidth compared with the conventional bending disc transducer by using the sound field coupling effect between the transducers.

[0017] The triangular structure has two output connectors on two straight lines between the arcs, and the cable is naturally bent at the arcs after being output by the connectors, so that the overall diameter of the transducer after the cable is connected is minimized, the design of the extended array is facilitated, the space occupied by the extended array is reduced, and technical support is provided for the realization of a broadband hanging sonar transmitting array with communication function. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the low-frequency broadband transducer of the application;

[0019] Figure 2 Fig. 2 is a schematic diagram of the skeleton structure of the low-frequency broadband transducer of the application;

[0020] Figure 3 Fig. 3 is a schematic diagram of the piezoelectric ceramic and support plate assembly structure of the low-frequency broadband transducer of the application;

[0021] Figure 4 Fig. 4 is a schematic diagram of the structure of the low-frequency broadband transducer of the application after the vulcanized rubber layer is assembled with the connector;

[0022] Figure 5 Fig. 5 is a sending voltage response curve of the low-frequency broadband transducer of the application.

[0023] The marks in the figure are as follows:

[0024] 1-support ring; 2-connector; 3-skeleton; 4-connection line; 5-waterproof glue; 6-support plate; 7-piezoelectric ceramic; 8-welding piece; 9-screw; 10-vulcanized rubber layer. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0026] As shown in the accompanying drawings Figures 1-5As shown, a kind of low-frequency wideband transducer of triangle shape includes transducer body, the transducer body includes support ring 1, connector 2, skeleton 3, connecting wire 4, water-tight glue 5, support plate 6, piezoelectric ceramic 7, soldering piece 8, screw 9 and vulcanized rubber layer 10, the support ring 1 is triangular outer shape structure, the skeleton 3 is provided with three circular rings connected in triangular distribution, skeleton 3 is installed in support ring 1, the support plate 6 is installed in the circular ring of skeleton 3, the piezoelectric ceramic 7 is installed on support plate 6, piezoelectric ceramic 7 and support plate 6 are collectively referred to as bending vibrator, bending vibrator is consistent with bending disc transducer vibrator, with small size low-frequency emission characteristics, piezoelectric ceramic 7 is used to drive bending vibrator to do bending vibration, support plate 6 is bending vibrator metal structural member, for forming bending vibrator air back cavity, the connector 2 is symmetrically arranged at the linear segment of both sides of support ring 1, the vulcanized rubber layer 10 is arranged at the top inside of support ring 1, and the vulcanized rubber layer 10 is used to water-tight bending vibrator, the water-tight glue 5 is filled at the gap between multiple bending vibrators and vulcanized rubber layer 10.

[0027] Specifically, the skeleton 3 is made of titanium alloy material, the three circular rings of the skeleton have a diameter of 107 mm, a wall thickness of 1.5 mm, a height of 7 mm, and a center-to-center distance of 125 mm between each other, the skeleton 3 is used to determine the relative position relationship of the bending vibrators and simultaneously realize the simply supported boundary support of the bending vibrators, one metal skeleton 3 realizes the boundary support of the three bending vibrators, and the minimum center-to-center distance of the three horizontally arranged bending vibrators can be realized, the centers of the three bending vibrators are located at the three vertices of an equilateral triangle, and the bottom of the vulcanized rubber layer 10 is provided with a plurality of positioning steps, and the skeleton 3 is placed on the positioning steps.

[0028] Specifically, the support ring 1 has a circular arc transition at the three vertices, a maximum outer diameter of 350 mm, and a height of 40 mm, the circular arc is concentric with the adjacent bending vibrators inside, and the support ring 1 is provided with an array element spacing interface required for forming an extended array at the three vertex positions outside, the support ring 1 is provided with an array element bearing interface on both sides of the connector 2 outlet, the support ring 1 is used as a support skeleton for the vulcanized rubber layer 10, and a structure for forming an extended array of a wideband low-frequency transducer is reserved.

[0029] Specifically, the connecting wire 4 is used to connect the positive and negative leads of the parallel-connected bending vibrators with the connector 2, and the connecting wire 4 is a high-voltage-resistant wire with a wire diameter of 1 mm 2 Left and right.

[0030] Specifically, the connector 2 shell is made of titanium alloy material, and has a voltage resistance of more than 1000 V and a current resistance of more than 8 A, and the connector 2 is a two-core, high-voltage-resistant connector.

[0031] Specifically, the piezoelectric ceramic 7 is smaller in diameter than the support plate 6, the piezoelectric ceramic 7 adopts P8 piezoelectric wafer, the piezoelectric ceramic 7 is 90mm in diameter and 5mm in thickness, the support plate 6 is made of titanium alloy material, one side of the support plate 6 is provided with a circular step, the support plate 6 is 107mm in diameter and 6mm in height, the step is 104mm in diameter and 2mm in height.

[0032] Specifically, the water-proof glue 5 adopts polyurethane rubber material, which has excellent fluidity at 80℃ high temperature, the vulcanized rubber layer 10 adopts chloroprene rubber material, and the vulcanized rubber layer 10 is formed by mold vulcanization inside the support ring 1.

[0033] Specifically, the soldering piece 8 is a silver-plated single-head soldering piece, the soldering piece 8 is 2.5mm in diameter, and the soldering piece 8 is used for welding the positive lead of the bending vibrator, the screw 9 is an M2x5 customized titanium alloy screw, and the screw 9 is used for fixing the soldering piece 8 on the support plate 6 of the bending vibrator.

[0034] Specifically, the output directions of the connectors 2 are collectively directed to the straight line segment on the side of the support ring 1 without the connector 2.

[0035] The specific components of the application are executed according to the following operation:

[0036] 1) Component processing: roughen the positive electrode surface of the piezoelectric ceramic 7 wafer, remove the oxide layer, and clean it with alcohol; immerse and clean the metal structural parts such as the support ring 1 and the support plate 6 in gasoline;

[0037] 2) Sand blasting: sand blast the bonding surface of the support plate 6 and the piezoelectric ceramic 7 and the vulcanized rubber surface of the support ring 1, and pay attention to protect the non-bonding and non-vulcanization positions during sand blasting;

[0038] 3) Vulcanization: place the support ring 1 into a special vulcanization mold, fill and inject chloroprene rubber, and heat and pressurize for vulcanization;

[0039] 4) Piezoelectric ceramic wafer bonding: prepare several epoxy adhesives, evenly apply them to the sand blasted position of the support plate 6, bond the positive electrode of the piezoelectric ceramic 7 wafer to the support plate 6, press down with force during bonding, wipe off the excess epoxy adhesive, clamp with a tooling fixture, and then place it into an oven for curing;

[0040] 5) Vibrator assembly: prepare several epoxy adhesives, evenly apply them to the step position of the support plate 6 with the bonded piezoelectric ceramic 7 wafer, place the support plate 6 into the skeleton 3, wipe off the excess epoxy adhesive, clamp with a tooling fixture, and then place it into an oven for curing;

[0041] 6) Wire bonding: fasten the soldering piece 8 to the skeleton 3 with the screw 9, use high-temperature wires to connect the soldering piece 8 with the core wire of the connector 2, use high-temperature wires, i.e. connection wires 4, to connect all the piezoelectric ceramic 7 wafers in parallel, and connect the connection wires 4 with the core wire of the connector 2.

[0042] 7) Water-tight: the vulcanized rubber layer 10, the bending vibrator and the connector 2 assembled and wired are put into a special pouring mold, and polyurethane rubber is injected from the open surface of the vulcanized rubber layer 10 at a certain temperature. The injection is stopped when the polyurethane rubber is flush with the rubber sleeve, and the mold is put into an oven for curing.

[0043] The beneficial effect test results of the present application are shown in Figure 5 .

[0044] The above description is only preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any modification and replacement based on the technical solutions and inventive concepts provided by the present application should be covered within the protection scope of the present application.

Claims

1. A triangular low-frequency broadband transducer, comprising a transducer body, characterized in that: The transducer body includes a support ring (1), a connector (2), a frame (3), a connecting wire (4), a watertight adhesive (5), a support plate (6), a piezoelectric ceramic (7), a welding piece (8), a screw (9), and a vulcanized rubber layer (10). The support ring (1) has a triangular shape. The frame (3) is provided with three circular rings that are connected in a triangular distribution. The frame (3) is installed inside the support ring (1). The support plate (6) is installed inside the circular rings of the frame (3). The piezoelectric ceramic (7) is installed on the support plate (6). The piezoelectric ceramic (7) and the support plate (6) are collectively referred to as bending oscillators. The connector (2) is symmetrically arranged on the straight sections on both sides of the support ring (1). The vulcanized rubber layer (10) is located on the top of the inner side of the support ring (1). The watertight adhesive (5) fills the gaps between the multiple bending oscillators and the vulcanized rubber layer (10). The frame (3) is made of titanium alloy. The bottom of the vulcanized rubber layer (10) is provided with multiple positioning steps. The frame (3) is placed on the positioning steps.

2. The triangular low-frequency broadband transducer according to claim 1, characterized in that: The support ring (1) has a circular arc transition at its three vertices, and its arc is concentric with the adjacent curved oscillator inside. The support ring (1) has an array element spacing interface required to form an extended array at its three outer vertices. The connector (2) has array element bearing interfaces on both sides of the support ring (1).

3. The triangular low-frequency broadband transducer according to claim 1, characterized in that: The connecting wire (4) is used to connect the bending oscillator in parallel and connect the positive and negative leads of the bent oscillator in parallel to the connector (2). The connecting wire (4) is a high-temperature resistant wire.

4. The triangular low-frequency broadband transducer according to claim 1, characterized in that: The outer shell of the connector (2) is made of titanium alloy, and the connector (2) is a two-core, high-voltage resistant connector.

5. The triangular low-frequency broadband transducer according to claim 1, characterized in that: The diameter of the piezoelectric ceramic (7) is smaller than that of the support plate (6). The piezoelectric ceramic (7) is a P8 piezoelectric disc. The support plate (6) is made of titanium alloy material. A circular step is provided on one side of the support plate (6).

6. The triangular low-frequency broadband transducer according to claim 1, characterized in that: The watertight adhesive (5) is made of polyurethane rubber, and the vulcanized rubber layer (10) is made of chloroprene rubber.

7. The triangular low-frequency broadband transducer according to claim 1, characterized in that: The welding piece (8) is a silver-plated single-ended welding piece, which is used to weld the positive lead of the bending oscillator. The screw (9) is a custom M2x5 titanium alloy screw, which is used to fix the welding piece (8) on the support plate (6) of the bending oscillator.

8. The triangular low-frequency broadband transducer according to claim 1, characterized in that: The output direction of the connector (2) is directed towards the straight line segment on the side of the support ring (1) without the connector (2).

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