Overflow type curved disk transducer with internal baffle

Abstract

The present invention discloses an overflow type curved disk transducer with an internal baffle, and relates to the technical field of underwater acoustic transducers. In order to solve the technical problem that the existing curved disk has poor ability to withstand hydrostatic pressure, the curved disk transducer of the present invention includes an external support shell, an intermediate support plate, a channel rubber baffle, a rubber skin and a piezoelectric ceramic disc; the channel rubber baffle is symmetrically arranged on the upper and lower sides of the intermediate support plate, and the rubber skin is arranged on the other side of the channel rubber baffle away from the intermediate support plate; the edge of the intermediate support plate is connected to the open end of the external support shell, and the piezoelectric ceramic disc is arranged on the outer end face of the external support shell; the sealing end face of the external support shell is provided with a circular through hole, and the side face of the external support shell is evenly provided with strip holes, and the edge of the intermediate support plate and the external support shell form a cavity that is symmetrical up and down and connected to the outside world. The present invention can improve the acoustic performance of the curved disk transducer in a deep water environment.

Description

Technical Field

[0001] The invention relates to the technical field of underwater acoustic transducers, and in particular to an overflow type curved disc transducer with an internal baffle. Background Art

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

[0003] Patent publication number CN108769869A, "A Deepwater Disc Transducer", introduces a transducer structure in which a metal shell is placed inside a curved disc as a sound baffle. The patent proposes that there is only one side of the vibrating disc bonded with piezoelectric ceramics. 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.

[0004] Patent publication number CN107580274B of "Inlaid Curved Disc Hydroacoustic Transducer" introduces a structural form that uses inlaid ceramic strips instead of ceramic sheets, which increases the volume of the power element and can improve the transmission voltage response of the curved disc, but cannot solve the problem of the curved disc's poor ability to withstand hydrostatic pressure.

[0005] Patent publication number CN109195066B, "An ultra-low frequency curved disk transducer", proposes a structure that uses multiple smaller ceramics to drive a larger metal disk. This method solves the problem of structural realization of large-sized curved disks, but still does not solve the problem of poor hydrostatic pressure resistance of large-sized curved disks.

[0006] In view of the above shortcomings, the following invention is proposed. Summary of the invention

[0007] In view of the deficiencies in the background technology, the present invention provides an overflow-type curved disc transducer with an internal baffle. The present invention can improve the ability of the curved disc transducer to withstand hydrostatic pressure.

[0008] To achieve the above purpose, the technical solution of the present invention is as follows:

[0009] An overflow-type curved disk transducer with an internal baffle comprises an external support shell, an intermediate support plate, a channel rubber baffle, a rubber skin and a piezoelectric ceramic disc; the channel rubber baffle is symmetrically arranged on the upper and lower side surfaces of the intermediate support plate, and the rubber skin is arranged on the other side surface of the channel rubber baffle away from the intermediate support plate; the edge of the intermediate support plate is connected to the open end of the external support shell, and the piezoelectric ceramic disc is arranged on the outer end surface of the external support shell; a circular through hole is arranged on the sealing end surface of the external support shell, and strip holes are evenly arranged on the side surfaces of the external support shell, and the edge of the intermediate support plate and the external support shell form a cavity that is symmetrical up and down and connected to the outside world.

[0010] In order to ensure a firm connection between the middle support plate and the external support shell, the present invention provides another preferred solution, wherein an annular rib beam structure is provided at the edge of the middle support plate, and an annular groove structure is provided at a corresponding position of the open end of the external support shell.

[0011] In order to enable the water medium to quickly enter and exit the inner cavity of the transducer, the present invention provides another preferred solution, wherein the diameter of the piezoelectric ceramic disc is smaller than the external supporting shell, and the circular through holes are evenly distributed outside the edge of the piezoelectric ceramic disc.

[0012] In order to further maintain the pressure balance between the inner cavity of the transducer and the outside, the present invention provides another preferred solution, in which an annular groove is provided on the inner side of the sealing end surface of the external support shell.

[0013] In order to enable the internal sound baffle composed of the middle support plate, the channel rubber baffle and the rubber skin to perform well, the present invention provides another preferred solution, wherein the surface of the channel rubber baffle is provided with circular holes radiating outward from the center of the circle.

[0014] In order to ensure that the piezoelectric ceramic disc does not have a short circuit problem, the present invention provides another preferred solution, in which the outside of the piezoelectric ceramic disc is covered with a watertight layer.

[0015] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0016] The internal sound baffle composed of the middle support plate, the channel rubber baffle and the rubber skin is combined with the piezoelectric ceramic discs arranged on the upper and lower end surfaces of the external support shell to form an overflow type curved disk structure with a rubber sound baffle inside, which is symmetrical up and down and ensures the acoustic performance of the curved disk transducer in deep water environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is an axonometric diagram of the overall structure of this embodiment;

[0018] Attached Figure 2 is a cross-sectional view of the overall structure of this embodiment;

[0019] Attached Figure 3 is a front view of the internal sound baffle of this embodiment;

[0020] Attached Figure 4 is an axonometric view of the internal sound baffle of this embodiment;

[0021] Attached Figure 5 Detailed diagram of the rubber baffle structure of the channel in this embodiment;

[0022] The meaning of the numbers in the figure are: 1. External support shell; 2. Intermediate support plate; 3. Channel rubber baffle; 4. Rubber skin; 5. Piezoelectric ceramic disc; 6. Watertight layer. DETAILED DESCRIPTION

[0023] The following combination Figure 1 to Figure 5 The specific embodiments of the present invention are described in detail so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention is described in conjunction with its preferred specific embodiments, these embodiments are only illustrative, rather than limiting, the scope of the present invention.

[0024] like Figures 1 to 5 As shown, an overflow type curved disk transducer with an internal baffle comprises an external support shell 1, an intermediate support plate 2, a channel rubber baffle 3, a rubber skin 4 and a piezoelectric ceramic disc 5; the channel rubber baffle 3 is symmetrically arranged on the upper and lower sides of the intermediate support plate 2, and the rubber skin 4 is arranged on the other side of the channel rubber baffle 3 away from the intermediate support plate 2; the edge of the intermediate support plate 2 is connected to the open end of the external support shell 1, and the piezoelectric ceramic disc 5 is arranged on the outer end face of the external support shell 1; a circular through hole is arranged on the sealing end face of the external support shell 1, and strip holes are evenly arranged on the side faces of the external support shell 1, and the edge of the intermediate support plate 2 and the external support shell 1 form a cavity that is symmetrical up and down and connected to the outside.

[0025] The edge of the middle support plate 2 is provided with an annular rib beam structure, and the corresponding position of the open end of the outer support shell 1 is provided with an annular groove structure. The middle support plate 2 and the outer support shell 1 are firmly connected through the rib beam and the groove structure.

[0026] The diameter of the piezoelectric ceramic disc 5 is smaller than that of the external supporting shell 1 , and the circular through holes are evenly distributed outside the edge of the piezoelectric ceramic disc 5 .

[0027] An annular groove is provided inside the sealing end surface of the external support shell 1 .

[0028] The surface of the channel rubber baffle 3 is provided with circular holes radiating outward from the center of the circle.

[0029] The piezoelectric ceramic disc 5 is covered with a watertight layer 6 on the outside.

[0030] The basic steps for making an overflow curved disk transducer with an internal baffle are as follows:

[0031] The channel rubber baffle 3 is bonded to the middle support plate 2 by vulcanization, and the rubber skin 4 is bonded to the other side of the channel rubber baffle 3 by vulcanization. The three together constitute the internal sound baffle of the overflow curved disk transducer.

[0032] The middle support plate 2 is connected to the external support shell 1 with an annular groove structure at the open end through a raised annular rib beam structure. The two are formed into one by epoxy bonding and curing. The external support shell 1 is evenly provided with strip holes around it, and multiple through holes are provided on the upper and lower end faces for the water medium to quickly enter and exit the transducer cavity.

[0033] A piezoelectric ceramic disc 5 is bonded to the upper side of the external metal supporting shell 1. When an electric field is excited, the ceramic drives the metal shell to vibrate and radiate sound.

[0034] The outside of the piezoelectric ceramic disc 5 is covered with a watertight layer 6 made of epoxy injection or rubber vulcanization to ensure that the piezoelectric ceramic will not have a short circuit problem.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An overflow curved disk transducer with an internal baffle, characterized in that: The invention comprises an external support shell (1), an intermediate support plate (2), a channel rubber baffle plate (3), a rubber skin (4) and a piezoelectric ceramic disc (5); the channel rubber baffle plate (3) is symmetrically arranged on the upper and lower side surfaces of the intermediate support plate (2), and the rubber skin (4) is arranged on the other side surface of the channel rubber baffle plate (3) away from the intermediate support plate (2); the edge of the intermediate support plate (2) is connected to the open end of the external support shell (1), and the piezoelectric ceramic disc (5) is arranged on the outer end surface of the external support shell (1); the sealing end surface of the external support shell (1) is provided with a circular through hole, and the side surface of the external support shell (1) is evenly provided with strip holes, and the edge of the intermediate support plate (2) and the external support shell (1) form a cavity that is symmetrical from top to bottom and connected to the outside.

2. The curved disk transducer according to claim 1, characterized in that: An annular rib beam structure is provided at the edge of the middle support plate (2), and an annular groove structure is provided at a corresponding position of the opening end of the outer support shell (1).

3. The curved disk transducer according to claim 1, characterized in that: The diameter of the piezoelectric ceramic disc (5) is smaller than that of the external supporting shell (1), and the circular through holes are evenly distributed outside the edge of the piezoelectric ceramic disc (5).

4. The curved disk transducer according to claim 1, characterized in that: An annular groove is provided on the inner side of the sealing end surface of the external support shell (1).

5. The curved disk transducer according to claim 1, characterized in that: The surface of the channel rubber baffle (3) is provided with circular holes radiating outwards from the center of the circle.

6. The curved disk transducer according to claim 1, characterized in that: The piezoelectric ceramic disc (5) is externally covered with a watertight layer (6).

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