Transducer with internally mounted acoustic compliance disc

Abstract

The application provides a transducer with an internally mounted acoustic compliance disc, comprising: a piezoelectric ceramic, a metal substrate, a metal ring, an acoustic compliance disc and a water-tight coating layer; the acoustic compliance disc is mounted on the inner wall of the metal ring, the metal substrate is connected to the opening end surface of the metal ring; the metal substrate and the metal ring form a cavity structure, and the acoustic compliance disc is located in the cavity structure; the piezoelectric ceramic is connected to the two metal substrates, and the water-tight coating layer covers the surface of the piezoelectric ceramic. The application improves the pressure resistance of the disc transducer while ensuring reliable acoustic radiation performance.

Description

Technical Field

[0001] This invention relates to the field of underwater acoustic engineering technology, and more specifically, to a transducer with an internally installed acoustic compatibility disc, particularly a disc transducer with an internally installed acoustic compatibility disc. Background Technology

[0002] Underwater acoustic engineering technology plays a crucial role in human exploration of the ocean, and transducers, as energy conversion components, are key parts for underwater acoustic engineering equipment to achieve underwater detection. Based on the propagation characteristics of sound waves in water, the farther the detection distance, the lower the required sound wave frequency; therefore, low-frequency transducers are currently a research hotspot. Disc transducers are one type of low-frequency transducer, primarily operating in the bending vibration mode, and possess the advantages of low frequency and small size. Combining multiple disc transducers into an MPS (Multi-Disk System) allows for further reduction of the operating frequency and increase of the operating bandwidth within a limited size, making it more attractive for practical applications.

[0003] However, due to the hollow structure inside the disk transducer, its pressure resistance is limited by structural strength, and most can only operate at depths of tens to hundreds of meters, greatly restricting its application range. To achieve a greater operating depth, the pressure resistance is generally improved by increasing structural strength, but this leads to an increase in resonant frequency. Another approach is to connect the internal cavity of the disk transducer to the external fluid, forming an overflow structure to balance the internal and external pressures, but this will significantly reduce radiation efficiency. Therefore, it is necessary to design a pressure-resistant structure that improves the pressure resistance of the disk transducer while ensuring acoustic performance. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a transducer with an internally mounted acoustic disk.

[0005] A transducer with an internally mounted acoustically compliant disk provided by the present invention includes: a piezoelectric ceramic, a metal substrate, a metal ring, an acoustically compliant disk, and a watertight cladding layer.

[0006] The acoustic compatibility disc is mounted on the inner wall of the metal ring, and the metal substrate is connected to the open end face of the metal ring; the metal substrate and the metal ring form a cavity structure, and the acoustic compatibility disc is located inside the cavity structure.

[0007] The piezoelectric ceramic is connected on the two metal substrates, and the watertight coating layer covers the surface of the piezoelectric ceramic.

[0008] Preferably, the metal ring is provided with an overflow hole and a fixing bracket;

[0009] The overflow hole is disposed on the side of the metal ring, and the fixing bracket is disposed on the inner sidewall of the metal ring;

[0010] The acoustic disk is mounted on the inner wall of the metal ring via the fixed bracket.

[0011] Preferably, two metal substrates are provided, and the two metal substrates are respectively connected and disposed on the two open end faces of the metal ring;

[0012] The piezoelectric ceramic is configured as two, and the two piezoelectric ceramics are respectively connected and disposed on the two metal substrates.

[0013] Preferably, the diameter of the piezoelectric ceramic is less than or equal to the diameter of the metal substrate.

[0014] Preferably, the diameter of the metal substrate is equal to the outer diameter of the metal ring.

[0015] Preferably, the overflow holes are provided in a plurality of form, and the plurality of overflow holes are evenly distributed on the side of the metal ring;

[0016] There are several fixed supports, which are evenly distributed on the inner sidewall of the metal ring.

[0017] Preferably, the number of overflow holes is set to 3 to 6, and the number of fixing brackets is set to 3 to 6.

[0018] Preferably, the fixed bracket includes a bracket body and vibration-damping rubber connected together, the vibration-damping rubber being connected to the inner sidewall of the metal ring, and the bracket body being connected to the acoustic disk.

[0019] Preferably, the material of the metal substrate is aluminum, steel, or titanium alloy;

[0020] And / or, the metal ring is made of aluminum, steel, or titanium alloy;

[0021] And / or, the material of the watertight coating layer is rubber, polyurethane, or epoxy resin;

[0022] And / or, the material of the acoustic disk is aluminum, steel, or titanium alloy.

[0023] Preferably, the thickness of the acoustic disk is less than the height of the cavity structure formed by the metal substrate and the metal ring;

[0024] And / or, the compressibility coefficient of the acoustic disk is greater than that of the external fluid.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Compared with the prior art, the present invention improves the pressure resistance of the disc transducer while ensuring reliable acoustic radiation performance by installing an acoustic compatibility disc inside the overflow cavity, making the acoustic impedance of the cavity much lower than that of the external fluid.

[0027] 2. The pressure resistance of a disc transducer with an internally mounted acoustic compliance plate according to the present invention depends on the working depth of the acoustic compliance plate and is independent of the structural strength of the transducer itself. Therefore, a transducer with a lower resonant frequency can be designed under the same size, and multiple working depths of the same transducer can be covered by selecting a suitable acoustic compliance plate. Attached Figure Description

[0028] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a disk transducer;

[0030] Figure 2 This is a schematic cross-sectional view of a disk transducer.

[0031] Figure 3 This is a schematic diagram of the structure of a metal ring;

[0032] Figure 4 This is a schematic diagram of the fixed support structure;

[0033] Figure 5 This is a schematic diagram of the structure of the sound-order disc;

[0034] Figure 6 A schematic diagram of the voltage response curve of a disk transducer.

[0035] The diagram shows:

[0036] Piezoelectric ceramic 1 Overflow hole 6

[0037] Metal substrate 2 Fixing bracket 7

[0038] 3 metal rings, 8 support bodies

[0039] Sound-absorbing disc 4, vibration-damping rubber 9

[0040] Watertight coating layer 5 Detailed Implementation

[0041] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0042] Example 1:

[0043] like Figures 1-6 As shown, this embodiment provides a transducer with an internally mounted acoustically compliant disc, comprising: a piezoelectric ceramic 1, a metal substrate 2, a metal ring 3, an acoustically compliant disc 4, and a watertight covering layer 5; the acoustically compliant disc 4 is mounted on the inner wall of the metal ring 3, and the metal substrate 2 is connected and disposed on the open end face of the metal ring 3; the metal substrate 2 and the metal ring 3 form a cavity structure, and the acoustically compliant disc 4 is located within the cavity structure; the piezoelectric ceramic 1 is connected and disposed on two metal substrates 2, and the watertight covering layer 5 covers the surface of the piezoelectric ceramic 1. The metal substrate 2 is made of aluminum, steel, or titanium alloy; the metal ring 3 is made of aluminum, steel, or titanium alloy; the watertight covering layer 5 is made of rubber, polyurethane, or epoxy resin. The acoustically compliant disc 4 is made of aluminum, steel, or titanium alloy.

[0044] The diameter of the piezoelectric ceramic 1 is less than or equal to the diameter of the metal substrate 2. The diameter of the metal substrate 2 is equal to the outer diameter of the metal ring 3. Two metal substrates 2 are provided, and the two metal substrates 2 are respectively connected and disposed on the two open end faces of the metal ring 3; two piezoelectric ceramics 1 are provided, and the two piezoelectric ceramics 1 are respectively connected and disposed on the two metal substrates 2.

[0045] An overflow hole 6 and a fixing bracket 7 are provided on a metal ring 3. The overflow hole 6 is located on the side of the metal ring 3, and the fixing bracket 7 is located on the inner wall of the metal ring 3. The acoustic compensator 4 is installed on the inner wall of the metal ring 3 through the fixing bracket 7. There are several overflow holes 6, which are evenly distributed on the side of the metal ring 3; there are several fixing brackets 7, which are evenly distributed on the inner wall of the metal ring 3. There are 3 to 6 overflow holes 6 and 3 to 6 fixing brackets 7. The fixing bracket 7 includes a bracket body 8 and vibration damping rubber 9 connected together. The vibration damping rubber 9 is connected to the inner wall of the metal ring 3, and the bracket body 8 is connected to the acoustic compensator 4.

[0046] The thickness of the acoustic compatibility disk 4 is less than the height of the cavity structure formed by the metal substrate 2 and the metal ring 3; the compressibility coefficient of the acoustic compatibility disk 4 is greater than the compressibility coefficient of the external fluid.

[0047] Example 2:

[0048] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0049] To address the shortcomings of existing technologies, the purpose of this embodiment is to provide a disk transducer with an internally mounted acoustic disk. To achieve the above objective, this embodiment provides the following technical solution:

[0050] A disc transducer with an internally mounted acoustically compliant disc includes a piezoelectric ceramic 1, a metal substrate 2, a metal ring 3, an acoustically compliant disc 4, and a watertight covering layer 5. The metal ring 3 includes an overflow hole 6 and a fixing bracket 7. The acoustically compliant disc 4 is mounted on the inner wall of the metal ring 3 through the fixing bracket 7. The metal substrate 2 and the piezoelectric ceramic 1 each consist of two pieces. One side of the metal substrate 2 is bonded to the piezoelectric ceramic 1, and the other side is integrated with the end face of the metal ring 3 by laser welding or bonding.

[0051] In the above scheme, the number of piezoelectric ceramics 1 is 2 pieces, and the diameter is less than or equal to the diameter of the metal substrate 2.

[0052] In the above scheme, there are two metal substrates 2, and their diameters are the same as the outer diameter of the metal ring 3.

[0053] In the above scheme, the watertight coating layer 5 is uniformly coated on the surface of the piezoelectric ceramic 1.

[0054] In the above scheme, the number of overflow holes 6 is 3 to 6, which are evenly distributed on the side of the metal ring 3.

[0055] In the above scheme, the mounting bracket 7 includes a bracket body 8 and vibration isolation rubber 9, which are bonded together as a whole by adhesive.

[0056] In the above scheme, the number of fixed brackets 7 is 3 to 6, which are evenly distributed and installed on the inner wall of the metal ring 3.

[0057] In the above scheme, the fixing bracket 7 is connected to the metal ring 3 by adhesive or screw fixing.

[0058] In the above scheme, the material of the metal substrate 2 is aluminum, steel, titanium alloy or other metals.

[0059] In the above scheme, the material of the metal ring 3 is aluminum, steel, titanium alloy or other metals.

[0060] In the above scheme, the material of the watertight coating layer 5 is rubber, polyurethane or epoxy resin.

[0061] In the above scheme, the thickness of the acoustic disk 4 should be less than the height of the inner cavity formed by the metal substrate 2 and the metal ring 3.

[0062] In the above scheme, the acoustic compressibility disk 4 is a customized product, and its compression coefficient should be much greater than that of the external fluid.

[0063] In the above scheme, the material of the acoustic disk 4 is metals such as aluminum, steel, and titanium alloy.

[0064] Example 3:

[0065] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0066] like Figures 1 to 6 As shown, this embodiment provides a technical solution: a disc transducer with an internally mounted acoustically compliant disc, comprising a piezoelectric ceramic 1, a metal substrate 2, a metal ring 3, an acoustically compliant disc 4, and a watertight covering layer 5. The metal ring 3 includes an overflow hole 6 and a fixing bracket 7. The acoustically compliant disc 4 is mounted on the inner wall of the metal ring 3 through the fixing bracket 7. There are two pieces of both the metal substrate 2 and the piezoelectric ceramic 1. One side of the metal substrate 2 is bonded to the piezoelectric ceramic 1, and the other side is bonded to the end face of the metal ring 3 by laser welding or adhesive bonding to form a whole. Similarly, another piece of metal substrate 2 is bonded to the piezoelectric ceramic 1 and bonded to the end face of the metal ring 3 in the same way to form a whole.

[0067] The principle of a disc transducer with an internally mounted acoustically compliant disc is to design an overflow hole 6 on the side of a metal ring 3, allowing the transducer's inner cavity to communicate with the external fluid, achieving pressure balance and thus improving the transducer's pressure resistance. To improve the acoustic radiation efficiency of the disc transducer in overflow mode, an acoustically compliant disc 4 is installed on the inner wall of the metal ring 3. The acoustically compliant disc 4 is a custom-made product with a compressibility coefficient much greater than that of the external fluid, resulting in a much lower acoustic impedance inside the disc transducer than that of the external fluid, thereby improving acoustic radiation efficiency. The pressure resistance of this technical solution depends on the pressure resistance of the acoustically compliant disc 4; therefore, by selecting an acoustically compliant disc 4 with appropriate performance, the transducer can cover multiple operating depths.

[0068] like Figure 3 As shown, the metal ring 3 includes an overflow hole 6 and a fixing bracket 7.

[0069] like Figure 3 As shown, the number of overflow holes 5 is 3 to 6, which are evenly distributed on the side of the metal ring 3. In this invention, the number is 4.

[0070] like Figure 3 As shown, the number of fixed brackets 7 is 3 to 6, and the number of fixed brackets in this invention is 4. They are evenly installed on the inner wall of the metal ring 3 by means of screws or glue.

[0071] like Figure 4 As shown, the fixed bracket 7 includes a bracket body 8 and vibration isolation rubber 9, and the bracket body 8 and vibration isolation rubber 9 are bonded together as a whole by adhesive.

[0072] like Figure 1 As shown, the compliant disk 4 is installed on the inner wall of the metal ring 3 by means of a fixing bracket 7. The diameter of the inner tangent formed by several fixing brackets 7 is slightly larger than the diameter of the compliant disk 4, and the fixing brackets 7 abut against the outer edge of the compliant disk 4 for support.

[0073] like Figure 2 As shown, there are two metal substrates 2, which are bonded to the upper and lower end faces of the metal ring 3 by adhesive bonding or laser welding to form a whole.

[0074] like Figure 2 As shown, there are two piezoelectric ceramics 1, which are bonded to the outer surface of the metal ring 3 with adhesive to form a whole.

[0075] like Figure 2 As shown, the watertight coating layer 5 is made of polyurethane and is uniformly coated on the surface of the piezoelectric ceramic 1 by potting.

[0076] like Figure 5 As shown, the acoustic compressibility disc 4 is a custom-made product, and its compressibility coefficient should be much greater than that of the external fluid. The acoustic compressibility disc selected in this invention has a compressibility coefficient of 1.09 × 10⁻⁶. -8 Pa -1 The pressure resistance is greater than 3MPa, therefore the pressure resistance of this disc transducer is greater than 3MPa.

[0077] like Figure 6 The figure shows the transmitted voltage response curve obtained by measuring the disk transducer, with a diameter of 270 mm, a height of 50 mm, a resonant frequency of 250 Hz, and a transmitted voltage response of 118 dB at the resonant point.

[0078] This invention improves the pressure resistance of the disc transducer while ensuring reliable acoustic radiation performance.

[0079] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0080] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A transducer with an internally mounted acoustic disk, characterized in that, include: Piezoelectric ceramic (1), metal substrate (2), metal ring (3), acoustic disk (4) and watertight coating (5); The acoustic smoothing disc (4) is mounted on the inner wall of the metal ring (3), and the metal substrate (2) is connected to the open end face of the metal ring (3); the metal substrate (2) and the metal ring (3) form a cavity structure, and the acoustic smoothing disc (4) is located inside the cavity structure. The piezoelectric ceramic (1) is connected and disposed on the two metal substrates (2), and the watertight coating layer (5) covers the surface of the piezoelectric ceramic (1); The metal ring (3) is provided with an overflow hole (6) and a fixing bracket (7); The overflow hole (6) is provided on the side of the metal ring (3), and the fixing bracket (7) is provided on the inner side wall of the metal ring (3); The acoustic compass (4) is mounted on the inner wall of the metal ring (3) via the fixed bracket (7); The thickness of the acoustic disk (4) is less than the height of the cavity structure formed by the metal substrate (2) and the metal ring (3); The fixed bracket (7) includes a bracket body (8) and a vibration isolation rubber (9) connected together. The vibration isolation rubber (9) is connected to the inner wall of the metal ring (3), and the bracket body (8) is connected to the acoustic disk (4).

2. The transducer with an internally mounted acoustic disk according to claim 1, characterized in that, The metal substrate (2) is configured as two, and the two metal substrates (2) are respectively connected to the two open end faces of the metal ring (3); The piezoelectric ceramic (1) is configured as two, and the two piezoelectric ceramics (1) are respectively connected and disposed on the two metal substrates (2).

3. The transducer with an internally mounted acoustic disk according to claim 1, characterized in that, The diameter of the piezoelectric ceramic (1) is less than or equal to the diameter of the metal substrate (2).

4. The transducer with an internally mounted acoustic disk according to claim 1, characterized in that, The diameter of the metal substrate (2) is equal to the outer diameter of the metal ring (3).

5. The transducer with an internally mounted acoustic disk according to claim 1, characterized in that, The overflow hole (6) is configured as a plurality of holes, and the plurality of overflow holes (6) are evenly distributed on the side of the metal ring (3); There are several fixed supports (7), and the several fixed supports (7) are evenly distributed on the inner sidewall of the metal ring (3).

6. The transducer with an internally mounted acoustic disk according to claim 5, characterized in that, The overflow holes (6) are set to 3 to 6, and the fixing brackets (7) are set to 3 to 6.

7. The transducer with an internally mounted acoustic disk according to claim 1, characterized in that, The material of the metal substrate (2) is aluminum, steel, or titanium alloy; And / or, the metal ring (3) is made of aluminum, steel or titanium alloy; And / or, the material of the watertight coating layer (5) is rubber, polyurethane, or epoxy resin; And / or, the material of the acoustic disk (4) is aluminum, steel or titanium alloy.

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