Watertight packaging structure of underwater acoustic transducer

Abstract

The utility model provides a watertight packaging structure of an underwater acoustic transducer, which comprises a stainless steel housing, a copper film is welded on the stainless steel housing, and the copper film is provided with a filling port and an exhaust port; a decoupling structure and a PZT structure are arranged in the stainless steel housing, and the stainless steel housing is coated with a coupling agent primer; the PZT structure comprises a first silver layer and a second silver layer, and a first insulation sealing layer is arranged among the decoupling structure, the PZT structure and the stainless steel housing; and a second insulating sealing layer is arranged on the upper surface of the copper film. According to the utility model, the copper film substantially improves the insulation performance of the first insulation sealing layer, and substantially reduces the possibility that water molecules permeate into the internal structure, thereby ensuring the stable electrical performance of the underwater acoustic transducer. In addition, due to the fact that the copper film has excellent conductivity, remarkable electromagnetic shielding and restraining effects are achieved. The characteristic helps to reduce the influence of external electromagnetic interference on the performance of the underwater acoustic transducer, and improves the stability and reliability of the underwater acoustic transducer in a complex electromagnetic environment.

Description

Technical Field

[0001] The utility model relates to the technical field of underwater acoustic transducers, and particularly relates to a water-sealing structure for an underwater acoustic transducer. Background Art

[0002] An underwater acoustic transducer works by using the piezoelectric effect of crystals (quartz or sodium potassium tartrate) or piezoelectric ceramics (such as barium titanate and lead zirconate titanate) or the magnetostrictive effect of iron-nickel alloys. The so-called piezoelectric effect is to cut a crystal into thin slices in a certain direction and apply pressure to the crystal slices, and positive and negative charges will be generated on its two end faces respectively. Conversely, when a tensile force is applied to the crystal slices, charges opposite to those when pressure is applied will be generated on its two end faces. The electrostrictive effect is the opposite of the piezoelectric effect, that is, when an alternating voltage is applied to the two end faces of the crystal, the crystal will produce corresponding mechanical deformation.

[0003] Currently, various waterproof devices and measures are adopted for underwater acoustic transducers on the market, including rubber shells, epoxy resin seals, and polyurethane potting. The rubber shell may age and crack; epoxy resin is prone to cracking due to thermal expansion and is difficult to repair; the polyurethane potting material has water absorption, which will cause its volume insulation coefficient to decrease, thus reducing the performance of the entire underwater acoustic transducer. Although these waterproof structures and measures are diverse, they all have defects such as material aging, mechanical damage, insufficient waterproofing, and difficult maintenance. Summary of the Utility Model

[0004] In order to solve the problems of sealing performance and filling process in the prior art, the utility model provides a water-sealing structure for an underwater acoustic transducer, and the technical solution of the utility model is implemented as follows:

[0005] A water-sealing structure for an underwater acoustic transducer includes a stainless steel housing, a copper film is welded on the concave surface of the stainless steel housing, and a filling port and an exhaust port are opened on the copper film;

[0006] A decoupling structure and a PZT structure are arranged in the stainless steel housing, and a coupling agent primer is applied on the surfaces of the decoupling structure and the PZT structure;

[0007] The upper surface of the PZT structure is far from the decoupling structure, and the lower surface of the PZT structure is close to the decoupling structure;

[0008] The PZT structure includes a first silver layer and a second silver layer, the first silver layer is arranged on the upper surface of the PZT, and the first silver layer is arranged on the lower surface of the PZT structure;

[0009] A first insulating sealant layer is arranged between the decoupling structure, the PZT structure and the stainless steel housing;

[0010] The upper surface of the copper film is away from the stainless steel housing, and a second insulating and sealing layer is provided on the upper surface of the copper film.

[0011] Preferably, the materials of the first insulating and sealing layer and the second insulating and sealing layer include at least one of polyurethane, epoxy resin or sound-transmitting rubber.

[0012] Preferably, the first insulating and sealing layer and the second insulating and sealing layer are made of the same material.

[0013] Preferably, the first insulating and sealing layer and the second insulating and sealing layer are made of polyurethane.

[0014] Preferably, the first insulating and sealing layer is filled through the filling port into the gap between the decoupling structure, the PZT structure and the stainless steel housing.

[0015] The advantages of the present utility model are as follows:

[0016] After adopting the copper film soldering and sealing technology, the entire potting structure forms a highly efficient and almost impermeable water barrier. This copper film significantly improves the insulation performance of the polyurethane material below it, significantly reduces the possibility of water molecules penetrating into the internal structure, and thus ensures the stable electrical performance of the underwater acoustic transducer.

[0017] In addition, due to the excellent electrical conductivity of the copper film, it has a significant electromagnetic shielding and suppression effect on the entire underwater acoustic transducer. This characteristic helps to reduce the influence of external electromagnetic interference on the performance of the underwater acoustic transducer and improves its stability and reliability in a complex electromagnetic environment. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only one embodiment of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the water sealing structure of an underwater acoustic transducer.

[0021] In the above-mentioned drawings, each figure number label represents respectively:

[0022] 1, exhaust hole;

[0023] 2, second polyurethane layer;

[0024] 3, filling hole;

[0025] 4, copper film;

[0026] 5, first silver layer;

[0027] 6, PZT structure;

[0028] 7, second silver layer;

[0029] 8, decoupling structure;

[0030] 9, coupling agent base glue;

[0031] 10, first polyurethane layer;

[0032] 11, stainless steel housing. Detailed implementation manners

[0033] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0034] Unless otherwise defined, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs; the terms used in the detailed implementation manners are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the description of the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the detailed implementation manners of the present utility model, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, "a plurality" means more than two, unless otherwise specifically and clearly defined.

[0036] References to "embodiments" in the present utility model mean that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present utility model. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present utility model can be combined with other embodiments.

[0037] In the description of the embodiments of the present utility model, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present utility model generally represents an "or" relationship between the front and rear associated objects.

[0038] The embodiments of the present utility model will be described more specifically below. It should be noted that the embodiments of the present utility model are not limited to these embodiments.

[0039] Embodiment

[0040] In a specific embodiment, as Figure 1 shown, a water-sealing structure of an underwater acoustic transducer includes a stainless-steel housing 11. A copper film 4 is welded on the concave surface of the stainless-steel housing 11. A filling port 3 and an exhaust port 1 are formed on the copper film 4. A decoupling structure 8 and a PZT structure 6 are arranged inside the stainless-steel housing 11. A coupling agent primer 9 is applied on the surfaces of the decoupling structure 8 and the PZT structure 6. The upper surface of the PZT structure 6 is far from the decoupling structure 8, and the lower surface of the PZT structure 6 is close to the decoupling structure 8. The PZT structure 6 includes a first silver layer 5 and a second silver layer 7. The first silver layer 5 is arranged on the upper surface of the PZT, and the first silver layer 5 is arranged on the lower surface of the PZT structure 6. A first polyurethane layer 10 is arranged between the decoupling structure 8, the PZT structure 6 and the stainless-steel housing 11. The upper surface of the copper film 4 is far from the stainless-steel housing 11, and a second polyurethane layer 2 is arranged on the upper surface of the copper film 4. The first polyurethane layer 10 is filled in the gap between the decoupling structure 8, the PZT structure 6 and the stainless-steel housing 11 through the filling port 3.

[0041] In this embodiment, a layer of copper film 4 is precisely welded on the concave surface of the stainless-steel housing 11. On the copper film 4, two openings are designed: one as the filling port 3 for polyurethane and the other as the exhaust port 1 to ensure that the gas inside the stainless-steel housing 11 can be effectively discharged during the filling process.

[0042] Subsequently, according to the predetermined technological process, the polyurethane material is slowly poured into the internal space of the stainless steel housing 11 through the filling port 3 to form the first polyurethane layer 10. At the same time, closely monitor the patency of the exhaust port 1 to ensure that the gas in the stainless steel housing 11 can smoothly discharge from the exhaust port 1, avoiding the formation of bubbles or cavities, thereby ensuring uniform filling of the polyurethane.

[0043] When it is confirmed that the inside of the stainless steel housing 11 has been completely and evenly filled with polyurethane, then the filling port 3 and the exhaust port 1 are finely welded and sealed with a copper film to form a welded joint. This step aims to ensure the overall sealing of the underwater acoustic transducer, preventing the external environment from eroding the internal structure or the leakage of internal media.

[0044] Finally, polyurethane is further potted on the closed copper film 4 to form the second polyurethane layer 2. This additional protective measure not only enhances the overall structural strength of the underwater acoustic transducer but also further improves its waterproof, anti-corrosion, and sealing performance, thereby ensuring the stable operation of the underwater acoustic transducer in a complex environment. The entire operation process strictly follows the process standards to ensure that each step is accurate and error-free to meet the high standards of academic research and practical applications.

[0045] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An underwater acoustic transducer water-sealing structure, including a stainless steel housing, characterized in that, A copper film is welded to the concave surface of the stainless-steel housing, and a filling port and an exhaust port are provided on the copper film; A decoupling structure and a PZT structure are arranged in the stainless-steel housing, and a coupling agent primer is applied on the surfaces of the decoupling structure and the PZT structure; The upper surface of the PZT structure is far from the decoupling structure, and the lower surface of the PZT structure is close to the decoupling structure; The PZT structure includes a first silver layer and a second silver layer. The first silver layer is arranged on the upper surface of the PZT, and the first silver layer is arranged on the lower surface of the PZT structure; A first insulating and sealing layer is provided between the decoupling structure, the PZT structure and the stainless-steel housing; The upper surface of the copper film is far from the stainless-steel housing, and a second insulating and sealing layer is provided on the upper surface of the copper film.

2. The underwater acoustic transducer water-sealing structure according to claim 1, wherein The material selection of the first insulating and sealing layer and the second insulating and sealing layer includes at least one of polyurethane, epoxy resin or sound-transmitting rubber; 3. The underwater acoustic transducer water-sealing structure according to claim 2, wherein, The materials of the first insulating and sealing layer and the second insulating and sealing layer are the same; 4. The underwater acoustic transducer water sealing structure according to claim 3, characterized in that, The materials of the first insulating and sealing layer and the second insulating and sealing layer are polyurethane; 5. The underwater acoustic transducer water-sealing structure according to claim 4, wherein The first insulating and sealing layer is filled into the gap between the decoupling structure, the PZT structure and the stainless-steel housing through the filling port.

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