Overflow type curved disk transducer with external bonding baffle

Abstract

The present invention belongs to the technical field of underwater acoustic transmitter equipment, and specifically relates to an overflow type curved disk transducer with an externally bonded baffle, comprising a transducer body, wherein the transducer body comprises a supporting shell, a disc piezoelectric ceramic, a watertight layer, a channel rubber baffle and a solid rubber skin, wherein disc piezoelectric ceramics are symmetrically mounted on the upper and lower sides of the supporting shell, the outer side of each disc piezoelectric ceramic is covered with a watertight layer, an outer side of each watertight layer is mounted with a channel rubber baffle, the outer side of each channel rubber baffle is mounted with a solid rubber skin, and each channel rubber baffle is provided with a plurality of mutually symmetrical through holes, wherein the present invention bonds a channel rubber baffle to the outside of the curved disk, the channel rubber baffle is connected to the supporting shell, and no additional supporting structure is required, so the structure is more compact; the circular hole and the strip groove structure can realize the functions of connecting water inside and outside the shell and quickly entering and exiting the cavity when the transducer enters and exits.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater acoustic transmitter equipment, and in particular relates to an overflow type curved disk transducer with an external adhesive baffle. Background Art

[0002] Sound waves are the only carrier that can transmit information and energy over long distances in the ocean. As a hydroacoustic transducer that emits sound waves, it has important value in both military and civilian fields.

[0003] The curved disc transducer has the advantages of simple structure, small size, light weight and low operating frequency. However, the unique structure of the curved disc transducer also makes it less resistant to hydrostatic pressure, especially when the resonant frequency is low and the disc size is large (for example, a curved disc with a diameter of 400mm has an operating water depth of less than 100 meters). This problem greatly limits the scope of use of the curved disc. Traditional ways to increase the working water depth of the curved disc transducer include overflow and internal liquid filling, but both methods will significantly reduce the acoustic performance of the curved disc transducer.

[0004] Patent: CN201810511328.8 A deep-water curved disc transducer introduces a transducer structure in which a metal shell is placed inside the curved disc as a sound baffle. The patent proposes a vibrating disc with piezoelectric ceramics bonded to only one side. This asymmetric form will affect the acoustic performance of the transducer to a certain extent. In addition, the use of a metal shell as a sound baffle will cause the transducer to have a long transient state and severe waveform tailing.

[0005] Patent: CN201710594146.7 Inlaid curved disc underwater acoustic transducer introduces a structural form that uses inlaid ceramic strips instead of ceramic sheets. The increased volume of the power element can improve the sending voltage response of the curved disc, but it cannot solve the problem of the curved disc's poor ability to withstand hydrostatic pressure.

[0006] Patent: CN201810744800.2 An ultra-low frequency curved disc transducer proposes a structure that uses multiple smaller ceramics to drive a larger metal disc. This method solves the structural implementation problem of large-sized curved discs, but does not solve the problem of poor hydrostatic pressure resistance of large-sized curved discs.

[0007] The working mechanism of the present invention is similar to that of the overflow IV-type flextensional transducer with an acoustic baffle placed inside. The acoustic baffles are placed symmetrically on both sides of the vibrator inside the traditional overflow IV-type flextensional transducer. However, the internal space of the curved disk is small, making it difficult to place the acoustic baffle. Summary of the invention

[0008] Existing methods for increasing the working water depth of the curved disk transducer include: placing a metal shell inside as a sound baffle, internal liquid filling, overflow, etc.

[0009] A metal shell is placed inside as a sound baffle, such as the patent: CN201810511328.8, a deep-water curved disc transducer, which only has a single-sided vibrating shell. The transducer will produce severe swinging when working, and the radiation efficiency is much lower than that of the structure with bilaterally symmetrical vibrating shells. In addition, this structure uses a metal baffle structure, which will cause the transducer to emit sound waves with severe tailing, affecting the use of the transducer.

[0010] The internal filling method is to increase the working water depth of the transducer by balancing the internal and external pressures. This structure will cause the mechanical impedance of the transducer to increase sharply, and the voltage response of the transducer will drop significantly.

[0011] The overflow structure is to open a hole in the shell to connect the inside and outside of the transducer and balance the water pressure to achieve deep water operation. However, the simple overflow type has problems such as internal and external vibration anti-phase, low radiation resistance, and low transducer acoustic performance.

[0012] The main purpose of the present invention is to overcome the deficiencies of the prior art and provide an overflow type curved disk transducer with an externally bonded baffle.

[0013] To achieve the above object, the present invention adopts the following technical solutions:

[0014] An overflow-type curved disk transducer with an external adhesive baffle comprises a transducer body, wherein the transducer body comprises a supporting shell, a disc piezoelectric ceramic, a watertight layer, a channel rubber baffle and a solid rubber skin, wherein disc piezoelectric ceramics are symmetrically mounted on the upper and lower surfaces of the supporting shell, the outer side surface of each disc piezoelectric ceramic is covered with a watertight layer, an outer side surface of each watertight layer is mounted with a channel rubber baffle, an outer side surface of each channel rubber baffle is mounted with a solid rubber skin, and each channel rubber baffle is provided with a plurality of mutually symmetrical through holes.

[0015] Preferably, the through holes of each channel rubber baffle are evenly distributed radially with the center of the channel rubber baffle as the center, and the diameters of the through holes are consistent.

[0016] Preferably, the watertight layer is made of epoxy resin or vulcanized rubber material.

[0017] Preferably, a plurality of circular holes are arranged on the upper surface and the lower surface of the support shell near the outer circumference, and the plurality of circular holes are distributed in a circular arc.

[0018] Preferably, a plurality of strip-shaped grooves are provided on the side surface of the supporting shell.

[0019] Preferably, the diameter of the supporting shell is larger than the diameters of the disc piezoelectric ceramic, the watertight layer, the channel rubber baffle and the solid rubber skin.

[0020] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0021] The present invention adheres a channel rubber baffle to the outside of the curved disc, and the channel rubber baffle is connected to the supporting shell, so no additional supporting structure is required, and the structure is more compact; and the circular hole and strip groove structure on the supporting shell can realize the function of water connection inside and outside the shell and rapid water in and out of the cavity during the process of transducer entry and exit. At the same time, the solid rubber skin set on both sides avoids the serious swing phenomenon when the transducer is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the overflow type curved disk transducer of the present invention;

[0023] Figure 2 is an overall cross-sectional view of the overflow type curved disk transducer of the present invention;

[0024] Figure 3 It is a structural diagram of a channel rubber baffle of an overflow type curved disk transducer of the present invention;

[0025] Figure 4 This is a structural diagram of the supporting shell of the overflow type curved disk transducer of the present invention.

[0026] The following are marked in the figure:

[0027] 1-support shell; 2-disc piezoelectric ceramic; 3-watertight layer; 4-channel rubber baffle; 5-solid rubber skin. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] As attached Figure 1-4As shown, an overflow type curved disk transducer with an external adhesive baffle includes a transducer body, wherein the transducer body includes a supporting shell 1, a disc piezoelectric ceramic 2, a watertight layer 3, a channel rubber baffle 4 and a solid rubber skin 5. The disc piezoelectric ceramics 2 are symmetrically installed on the upper and lower surfaces of the supporting shell 1. The disc piezoelectric ceramics 2 polarized in the thickness direction will drive the upper and lower surfaces of the supporting shell 1 to vibrate under the excitation of the electric field to radiate sound. The outer side surface of each of the disc piezoelectric ceramics 2 is covered with a watertight layer 3, and the outer side surface of each of the watertight layers 3 is installed with a channel rubber baffle 4, and the outer side surface of each of the channel rubber baffles 4 is installed with a solid rubber skin 5, and each of the channel rubber baffles 4 is provided with a plurality of mutually symmetrical through holes.

[0030] Specifically, the through holes of each channel rubber baffle 4 are evenly distributed radially with the center of the channel rubber baffle 4 as the center, and the diameters of the through holes are consistent. The channel rubber baffle 4 is used to improve the acoustic performance of the overflow curved disc. By adjusting the number of through holes on the channel rubber baffle 4, the acoustic performance and hydrostatic pressure resistance can be adjusted.

[0031] Specifically, the watertight layer 3 is made of epoxy resin or vulcanized rubber material to ensure that the disc piezoelectric ceramic 2 is insulated from external water, and at the same time serves as a bonding surface for the channel rubber baffle 4 .

[0032] Specifically, a plurality of circular holes are arranged near the outer circumference on the upper and lower surfaces of the support shell 1, and the plurality of circular holes are distributed in a circular arc. A plurality of strip grooves are opened on the side of the support shell 1. The arrangement of the circular holes and the strip grooves facilitates the flow of water inside and outside the support shell 1, thereby ensuring the balance of water pressure inside and outside the transducer and realizing deep water operation.

[0033] Specifically, the diameter of the support shell 1 is larger than the diameters of the disc piezoelectric ceramic 2, the watertight layer 3, the channel rubber baffle 4 and the solid rubber skin 5. The solid rubber skin 5 is used to seal the through holes on the channel rubber baffle 4 to form a closed air cavity.

[0034] The basic functions of the flooded curved disk transducer with external bonded baffle are as follows:

[0035] The channel rubber baffle 4 is bonded to the surface of the transducer supporting shell 1 through its structural features and cooperates with the circular holes and strip groove structure of the supporting shell 1 to realize the function of water connection inside and outside the shell and rapid entry and exit of water into and out of the cavity when the transducer is in and out.

[0036] The channel rubber baffle 4 is used to improve the acoustic performance of the overflow curved disc. The acoustic performance and the hydrostatic pressure resistance can be adjusted by adjusting the number of through holes on the channel rubber baffle 4.

[0037] The disc piezoelectric ceramic 2 will drive the upper and lower surfaces of the supporting shell 1 to vibrate under the excitation of the electric field, thereby radiating sound.

[0038] The above description is only a preferred implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be included in the protection scope of the present invention.

Claims

1. An overflow curved disk transducer with an external adhesive baffle, comprising a transducer body, characterized in that: The transducer body comprises a supporting shell (1), a disc piezoelectric ceramic (2), a watertight layer (3), a channel rubber baffle (4) and a solid rubber skin (5); the disc piezoelectric ceramic (2) is symmetrically mounted on the upper and lower surfaces of the supporting shell (1); the outer side surface of each disc piezoelectric ceramic (2) is covered with a watertight layer (3); an outer side surface of each watertight layer (3) is mounted with a channel rubber baffle (4); the outer side surface of each channel rubber baffle (4) is mounted with a solid rubber skin (5); and each channel rubber baffle (4) is provided with a plurality of mutually symmetrical through holes.

2. The overflow curved disk transducer with an external adhesive baffle according to claim 1, characterized in that: The through holes of each channel rubber baffle (4) are evenly distributed in a radial shape with the center of the channel rubber baffle (4) as the center, and the diameters of the through holes are consistent.

3. The overflow curved disk transducer with an externally bonded baffle according to claim 1, characterized in that: The watertight layer (3) is made of epoxy resin or vulcanized rubber material.

4. The overflow curved disk transducer with an externally bonded baffle according to claim 1, characterized in that: The upper surface and the lower surface of the support shell (1) are provided with a plurality of circular holes near the outer circumference, and the plurality of circular holes are distributed in a circular arc.

5. The overflow curved disk transducer with an externally bonded baffle according to claim 1, characterized in that: A plurality of strip-shaped grooves are provided on the side surface of the support shell (1).

6. The overflow curved disk transducer with an externally bonded baffle according to claim 1, characterized in that: The diameter of the supporting shell (1) is greater than the diameters of the disc piezoelectric ceramic (2), the watertight layer (3), the channel rubber baffle (4) and the solid rubber skin (5).

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