A overflow type curved disk transducer with an external baffle

Abstract

The present invention belongs to the technical field of underwater acoustic transmitter equipment, and specifically relates to an overflow type curved disc transducer with a baffle placed on the outside, comprising a transducer body, wherein the transducer body comprises a supporting shell, a disc piezoelectric ceramic, a watertight layer, a compression cover plate, a supporting rod, a supporting metal plate, a channel rubber and a solid rubber skin, wherein the supporting shell is symmetrically provided with disc piezoelectric ceramics on the upper and lower sides, and a plurality of compression cover plates are evenly provided on the side of the supporting shell, the disc piezoelectric ceramics are provided with a watertight layer, a supporting metal plate is provided on one side of the watertight layer, channel rubbers are symmetrically provided on the upper and lower sides of the supporting metal plates, and a solid rubber skin is provided on one side of the channel rubber, wherein the present invention places a baffle on the outside of the curved disc, the baffle is independent of the supporting shell, and the performance of the transducer can be changed by adjusting the performance of the baffle; and the circular hole and the strip groove structure can realize the function of connecting the water inside and outside the shell and the rapid entry and exit of water into and out of the cavity during the process of the transducer entering and exiting.

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 a baffle placed externally. 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 shortcomings of the prior art and provide an overflow type curved disk transducer with an external 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 baffle comprises a transducer body, wherein the transducer body comprises a supporting shell, a disc piezoelectric ceramic, a watertight layer, a clamping cover plate, a supporting rod, a supporting metal plate, a channel rubber and a solid rubber skin, wherein the supporting metal plate, the channel rubber and the solid rubber skin constitute the baffle, the disc piezoelectric ceramics are symmetrically mounted on the upper and lower surfaces of the supporting shell, and a plurality of clamping cover plates are evenly mounted on the side surfaces of the supporting shell, a semi-open square hole is opened on the side edge of the clamping cover plate, a watertight layer is arranged on the outer side surface of each of the disc piezoelectric ceramics, a supporting metal plate is arranged on the outer side surface of each of the watertight layers, channel rubbers are symmetrically arranged on the upper and lower surfaces of each of the supporting metal plates, solid rubber skins are mounted on the outer side surfaces of the channel rubbers on the outer sides of the two supporting metal plates, and a plurality of through holes are arranged on all the channel rubbers.

[0015] Preferably, the baffle adopts a structure with a supporting metal plate in the middle, channel rubber on both sides, and a solid rubber skin on the outermost side, and the baffle is connected to the transducer body through a supporting rod.

[0016] Preferably, a strip plate is arranged at the outer edge of the supporting metal plate, and a semi-open square hole is opened on one end of the strip plate away from the center of the supporting metal plate.

[0017] Preferably, a plurality of clamping parts are provided on the support rod, and the clamping parts are clamped with the semi-open square holes.

[0018] Preferably, the through holes on the channel rubber are evenly distributed radially with the center of the corresponding channel rubber as the center, and the diameters of the through holes are consistent.

[0019] Preferably, the watertight layer is made of epoxy resin or vulcanized rubber material.

[0020] 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.

[0021] Preferably, a plurality of strip grooves are provided on the side surface of the support shell, and the strip grooves are staggered with the pressing cover plate.

[0022] Preferably, the diameter of the supporting shell is larger than the diameters of the disc piezoelectric ceramic, the watertight layer, the supporting metal plate, the channel rubber and the solid rubber skin.

[0023] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0024] The present invention places a baffle on the outside of the curved disk, and the baffle is independent of the supporting shell. The performance of the transducer can be changed by adjusting the performance of the baffle. The circular holes and strip grooves on the supporting shell can realize the functions of water communication inside and outside the shell and rapid water entry and exit of the cavity when the transducer is in and out. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the overflow type curved disk transducer of the present invention;

[0026] Figure 2 is an overall cross-sectional view of the overflow type curved disk transducer of the present invention;

[0027] Figure 3 This is a diagram of the channel rubber structure of the overflow type curved disk transducer of the present invention;

[0028] Figure 4 It is a structural diagram of the supporting housing of the overflow type curved disk transducer of the present invention;

[0029] Figure 5 This is a structural diagram of a supporting metal plate of an overflow type curved disk transducer of the present invention;

[0030] Figure 6 This is a structural diagram of the support rod of the overflow type curved disk transducer of the present invention.

[0031] The following are marked in the figure:

[0032] 1-support shell; 2-disc piezoelectric ceramic; 3-watertight layer; 4-compression cover plate; 5-support rod; 6-support metal plate; 7-channel rubber; 8-solid rubber skin. DETAILED DESCRIPTION

[0033] 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.

[0034] As attached Figure 1-6 As shown, an overflow type curved disk transducer with an external baffle plate includes a transducer body, wherein the transducer body includes a supporting shell 1, a disc piezoelectric ceramic 2, a watertight layer 3, a pressing cover plate 4, a supporting rod 5, a supporting metal plate 6, a channel rubber 7 and a solid rubber skin 8, wherein the supporting metal plate 6, the channel rubber 7 and the solid rubber skin 8 constitute a baffle plate, and the disc piezoelectric ceramic 2 is symmetrically mounted on the upper and lower surfaces of the supporting shell 1, and the disc piezoelectric ceramic 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. Acoustic radiation is carried out, and a plurality of clamping cover plates 4 are evenly installed on the side of the supporting shell 1, a semi-open square hole is opened on the upper side of the clamping cover plate 4, a watertight layer 3 is arranged on the outer side surface of each of the disc piezoelectric ceramics 2, a supporting metal plate 6 is arranged on the outer side surface of each of the watertight layers 3, and channel rubbers 7 are symmetrically arranged on the upper and lower surfaces of each of the supporting metal plates 6, and solid rubber skins 8 are installed on the outer sides of the channel rubbers 7 located on the outer sides of the two supporting metal plates 6, and a plurality of through holes are arranged on all the channel rubbers 7.

[0035] Specifically, the baffle adopts a structure with a supporting metal plate 6 in the middle, channel rubber 7 on both sides, and a solid rubber skin 8 on the outermost side. The baffle is connected to the transducer body through a supporting rod 5, and the baffle is arranged outside the transducer body. The performance of the transducer body can be changed by replacing the baffle.

[0036] Specifically, a strip plate is provided at the outer circular edge of the support metal plate 6, and a semi-open square hole is opened on the end of the strip plate away from the center of the support metal plate 6; a plurality of clamping parts are provided on the support rod 5, and the clamping parts are clamped with the semi-open square hole. The support rod 5 passes through the clamping cover plate 4 and the semi-open square hole on the strip plate, and the support rod 5 can be used to connect the support shell 1 and the support metal plate 6, so that the clamping cover plate 4 can lock the support shell 1 and the support metal plate 6.

[0037] Specifically, the through holes on the channel rubber 7 are evenly distributed radially with the center of the corresponding channel rubber 7 as the center, and the diameters of the through holes are consistent. The channel rubber 7 is used to improve the acoustic performance of the overflow curved disc. By adjusting the number of through holes on the channel rubber 7, the acoustic performance and hydrostatic pressure resistance can be adjusted.

[0038] 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 serves as a bonding surface for the channel rubber 7 .

[0039] 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 surface of the support shell 1, and the strip grooves are staggered with the clamping cover plate 4. 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.

[0040] Specifically, the diameter of the supporting shell 1 is larger than the diameters of the disc piezoelectric ceramic 2, the watertight layer 3, the supporting metal plate 6, the channel rubber 7 and the solid rubber skin 8. The solid rubber skin 8 is used to seal the through holes on the channel rubber 7 to form a closed air cavity.

[0041] The basic functions of an externally baffled flooded bent disk transducer are as follows:

[0042] By placing a baffle on the outside of the curved disk, the baffle is independent of the supporting shell 1, and the performance of the transducer can be changed by adjusting the performance of the baffle; and the circular holes and strip groove structures on the supporting shell 1 can realize the function of connecting water inside and outside the shell and quickly entering and exiting the cavity when the transducer is entering and exiting.

[0043] The channel rubber 7 is used to improve the acoustic performance of the overflow curved disc. By adjusting the number of through holes on the channel rubber 7, the acoustic performance and the hydrostatic pressure resistance can be adjusted.

[0044] The support rod 5 can be used to connect the support shell 1 and the support metal plate 6 , so that the pressing cover plate 4 can lock the support shell 1 and the support metal plate 6 .

[0045] 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 type curved disk transducer with an external 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 pressing cover plate (4), a supporting rod (5), a supporting metal plate (6), a channel rubber (7) and a solid rubber skin (8), wherein the supporting metal plate (6), the channel rubber (7) and the solid rubber skin (8) constitute a baffle, the disc piezoelectric ceramic (2) is symmetrically mounted on the upper and lower surfaces of the supporting shell (1), and a plurality of pressing cover plates (4) are evenly mounted on the side surface of the supporting shell (1), a semi-open square hole is opened on the upper side edge of the pressing cover plate (4), a watertight layer (3) is arranged on the outer side surface of each disc piezoelectric ceramic (2), a supporting metal plate (6) is arranged on the outer side surface of each watertight layer (3), a channel rubber (7) is symmetrically arranged on the upper and lower surfaces of each supporting metal plate (6), a solid rubber skin (8) is mounted on the outer side surfaces of the channel rubber (7) located on the outer sides of the two supporting metal plates (6), and a plurality of through holes are arranged on all the channel rubbers (7).

2. The overflow curved disk transducer with an external baffle according to claim 1, characterized in that: The baffle plate adopts a structure with a supporting metal plate (6) in the middle, channel rubber (7) on both sides, and a solid rubber skin (8) on the outermost side, and the baffle plate is connected to the transducer body via a supporting rod (5).

3. The overflow type curved disk transducer with an external baffle according to claim 1, characterized in that: A strip plate is provided at the outer edge of the supporting metal plate (6), and a semi-open square hole is provided at one end of the strip plate away from the center of the supporting metal plate (6).

4. The overflow curved disk transducer with an external baffle according to claim 3, characterized in that: The support rod (5) is provided with a plurality of clamping parts, and the clamping parts are clamped with the semi-open square holes.

5. The overflow type curved disk transducer with an external baffle according to claim 1, characterized in that: The through holes on the channel rubber (7) are evenly distributed radially with the center of the corresponding channel rubber (7) as the center, and the diameters of the through holes are consistent.

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

7. The overflow curved disk transducer with an external 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.

8. The overflow type curved disk transducer with an external baffle according to claim 1, characterized in that: A plurality of strip grooves are provided on the side surface of the support shell (1), and the strip grooves are staggered with the pressing cover plate (4).

9. The overflow type curved disk transducer with an external 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 supporting metal plate (6), the channel rubber (7) and the solid rubber skin (8).

Images