Annular transducer integrated watertight device and method

Abstract

The invention provides an integrally-formed watertight device and method for a ring transducer. The integrally-formed watertight device comprises a piezoelectric ceramic ring (1), a metal baffle (2), an upper sealing layer (3), an upper sealing layer manufacturing mold (4), a lower sealing layer (5), a lower sealing layer manufacturing mold (6), a watertight potting layer (7), an outer side potting mold (8) and a bottom layer potting mold (9). According to the method, the watertight manufacturing problem of the existing slow waveguide circular ring transducer is solved, the deepwater resistance of the transducer is improved, the underwater working time of the transducer is prolonged, and a design method and design reference are provided for watertight manufacturing of other types of liquid-filled transducers.

Description

Technical Field

[0001] The invention belongs to the field of potting and manufacturing of underwater acoustic transducers, and in particular, relates to a method for integrally forming a circular ring transducer in a watertight manner. Background Art

[0002] Since the 21st century, all countries have attached great importance to the construction of a strong maritime nation. Comprehensively building a strong maritime nation is not only a necessary means to maintain national security and development, but also a way to expand a country's overseas interests. Building a strong maritime nation with advanced marine science and technology, developed marine economy, marine ecological civilization, and strong marine comprehensive national strength is inseparable from the long-term development of hydroacoustic engineering technology.

[0003] Sound waves are the only information carrier that can be transmitted over long distances in the marine environment. As a carrier for underwater sound wave transmission and reception, underwater acoustic transducers are widely used in the field of underwater acoustic engineering. Overflow ring transducers have the characteristics of deep water resistance, wide bandwidth, and high power. They are widely used in communication buoys, underwater acoustic countermeasures and other equipment. In particular, by filling the inner cavity of the overflow ring transducer with a liquid with a low sound velocity to form a slow waveguide transducer, the transmission frequency band of the transducer can be widened. The introduction of slow waveguide technology can further realize the regulation of the axial directivity of the transducer, and further utilize the reflection effect of the metal base to achieve the half-space radiation performance of the slow waveguide ring transducer. Therefore, the slow waveguide ring transducer has broad application prospects and high research value.

[0004] Since the watertight manufacturing technology of slow waveguide transducers seriously affects the deep water resistance and long-term underwater working ability of transducers, and the existence of slow waveguides, i.e. liquid cavities, inside the transducers, the watertight manufacturing technology of transducers has always been a major problem in transducer design and manufacturing. Therefore, domestic and foreign scholars have conducted preliminary research on the watertight manufacturing process of slow waveguide annular transducers. The existing research first uses mold preforming technology at high temperature to make the transducer watertight layer, and then embeds the piezoelectric ceramic elements and metal baffles into the preformed watertight layer, and finally bonds or tightens the watertight layer and the metal baffle to achieve watertight manufacturing of the transducer. However, this method has certain problems and technical difficulties.

[0005] (1) Slight deformation of the watertight layer after preforming

[0006] The watertight layer preforming technology usually needs to be carried out at high temperature. After the watertight layer preforming is completed and the temperature drops from the high temperature state to the normal temperature state, the watertight layer will have a slight deformation. The slight deformation will cause errors in the nesting and bonding between the watertight layer and the piezoelectric ring and the metal baffle, resulting in a decrease in acoustic performance and watertight failure.

[0007] (2) There is a gap between the watertight layer and the piezoelectric element

[0008] When using the inlaid ring to make a slow waveguide ring transducer, since the outer surface of the inlaid ring is usually covered with a mixed layer of glass fiber and epoxy resin, and the surface of the mixed layer is relatively rough, the nesting between the watertight layer and the piezoelectric element will most likely not be tight, which will affect the acoustic performance and deep water resistance of the transducer.

[0009] (3) The bonding method between the watertight layer and the metal baffle is likely to fail

[0010] Using adhesives such as glue to bond the watertight layer to the metal baffle can achieve a tight connection in a short period of time, but the firmness of the adhesive will decrease over a long period of time, that is, the possibility of failure of this bonding method will increase, affecting the reliability of the slow waveguide ring transducer for buoys during long-term use.

[0011] (4) The tight connection between the watertight layer and the metal baffle is easy to fall off

[0012] Using a metal ring to tighten the watertight layer and the metal baffle and combining it with a sealing ring will achieve a better packaging effect. However, the slow waveguide ring transducer may fall off when it is impacted by a large weight, which is not conducive to the packaging of large-volume transducers.

[0013] In the relevant prior art, patent document CN104723486A discloses a casting and vulcanization mold for mosaic ring transducers, which consists of a mold bottom, a support column, an epoxy plate with evenly distributed holes, a cast polyurethane sound-transmitting rubber, a piezoelectric element, a mold cover, a conical vulcanization cavity of the cable lead-out end, a cable hole, a mold cavity, a casting hole and a casting cavity; the structure disclosed in the patent document is only applicable to the overflow ring transducer structure, and is not applicable to the watertight layer production requirements of the slow waveguide ring transducer; its positioning structure is realized by pre-embedded structural parts, and the pre-embedded structural parts have an adverse effect on the watertight production of the transducer, which may cause water leakage; and the exhaust holes in the structure cause risks in the casting process. Once the bubbles in the polyurethane rubber are not completely discharged, the surface of the transducer will be covered with air holes.

[0014] Therefore, in order to further improve the deep water resistance of slow waveguide annular transducers and extend the underwater working time of the transducers, a watertight manufacturing technology study should be carried out for slow waveguide annular transducers, that is, a watertight method for annular transducers to be integrally formed. This manufacturing method can provide a design method and design reference for the watertight manufacturing of other types of liquid-filled transducers. Summary of the invention

[0015] In view of the defects in the prior art, an object of the present invention is to provide a ring transducer integrally formed watertight device and method.

[0016] According to the present invention, a circular transducer integrally formed watertight device comprises: a piezoelectric ceramic circular ring, a metal baffle, an upper sealing layer, a lower sealing layer, an outer potting mold, a bottom potting mold, and a fixing member;

[0017] The upper sealing layer, the piezoelectric ceramic ring, and the lower sealing layer are fixed in sequence from top to bottom to form a transducer potting body;

[0018] The upper sealing layer is firmly installed under the metal baffle;

[0019] The fixing part installs the transducer potting body on the outer potting mold and the bottom potting mold.

[0020] Preferably, the piezoelectric ceramic ring is inserted into the limiting groove of the upper sealing layer for fixation.

[0021] Preferably, the upper sealing layer is bonded to the limiting groove of the metal baffle for fixation.

[0022] Preferably, the space between the transducer potting body, the outer potting mold and the bottom potting mold constitutes the filling space of the watertight potting layer.

[0023] Preferably, the piezoelectric ceramic ring is a tangentially polarized mosaic ring.

[0024] Preferably, the metal baffle has a concave-convex structure or a frosted treatment at the edge.

[0025] Preferably, a limiting groove is provided at a fixed position between the metal baffle and the upper sealing layer.

[0026] Preferably, the upper sealing layer is a cylindrical structure or an annular structure.

[0027] Preferably, the outer potting mold and the bottom potting mold are integrated or spliced ​​in design; the fixing member is used to fix the height and position.

[0028] According to a method for integrally forming a ring transducer to be watertight, the invention provides a method for integrally forming a ring transducer to be watertight. The method uses the integrally forming a ring transducer to be watertight.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention realizes the watertight manufacturing process of the slow waveguide circular ring transducer, improves the deep water resistance of the slow waveguide circular ring transducer, and prolongs the underwater working time of the transducer.

[0031] 2. The upper sealing layer and the lower sealing layer in the present invention are made of polyurethane watertight material, which has good sound transmission performance and sealing performance, and can ensure that the electroacoustic performance of the transducer varies little with the design.

[0032] 3. In the present invention, both the upper sealing layer and the metal baffle have a limiting structure, which helps to ensure the accuracy of the overall installation of the transducer, improves the assembly accuracy of the transducer, and does not affect the watertight effect.

[0033] 4. The present invention adopts integrated polyurethane potting technology to achieve one-time potting molding of the outer surface of the transducer, reduce the generation of bubbles during the potting process, and improve the watertightness of the transducer.

[0034] 5. The present invention realizes the integrated design of the outer watertight layer, thereby improving the overall structural strength of the transducer.

[0035] 6. The exhaust area of ​​the present invention is the entire circumferential annular plane, and the casting exhaust area is much larger than the exhaust hole, which can effectively reduce the generation of pores; and zero pore optimization can be further achieved through excessive potting and other methods combined with subsequent cutting technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1 It is a cross-sectional structural diagram of the transducer mold when it is installed before potting production of the present invention;

[0038] Figure 2 is a cross-sectional structural diagram of the transducer after potting of the present invention;

[0039] Figure 3 is a cross-sectional structural diagram of the upper sealing layer manufacturing mold 4 of the present invention;

[0040] Figure 4 It is a three-dimensional stereogram of the upper sealing layer manufacturing mold 4 of the present invention;

[0041] Figure 5 is a cross-sectional structural diagram of a mold 6 for manufacturing a lower sealing layer according to the present invention;

[0042] Figure 6 It is a three-dimensional stereogram of the mold 6 for making the lower sealing layer of the present invention.

[0043] The figure shows:

[0044] DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0046] In order to solve the problem of watertight manufacturing of existing slow waveguide circular ring transducers, improve the deep water resistance of the transducer, extend the underwater working time of the transducer, and provide a design method and design reference for the watertight manufacturing of other types of liquid-filled transducers, the present invention explores a watertight method for one-piece molding of a circular ring transducer.

[0047] According to the present invention, a circular ring transducer integrally formed watertight device comprises: a piezoelectric ceramic circular ring 1, a metal baffle 2, an upper sealing layer 3, a lower sealing layer 5, an outer potting mold 8, a bottom potting mold 9, and fixing bolts 10.

[0048] Use as Figure 3 , Figure 4 The upper sealing layer making mold 4 shown in the figure is filled with polyurethane to make the upper sealing layer 3, using Figure 5 , Figure 6 The lower sealing layer mold 6 shown in the figure is filled with polyurethane to make the lower sealing layer 5, and the piezoelectric ceramic ring 1 is fixed to the upper sealing layer 3 and the lower sealing layer 5 with glue, and the piezoelectric ceramic ring 1 is inserted into the limiting groove of the upper sealing layer 3, and the upper sealing layer 3 is bonded to the limiting groove of the metal baffle 2, forming a Figure 2 The transducer potting body shown in the figure is mounted on the outer potting mold 8 and the bottom potting mold 9 by using fixing bolts 10. Figure 1 As shown, the watertight potting layer 7 is made of polyurethane.

[0049] The present invention will be described in more detail below.

[0050] The piezoelectric ceramic ring 1 can be a tangentially polarized inlaid ring; the metal baffle 2 adopts a concave-convex structure or frosted treatment on the edge; the metal baffle 2 is provided with a limiting groove at a fixed position between the metal baffle 2 and the upper sealing layer 3; the upper sealing layer 3 and the lower sealing layer 5 are obtained by polyurethane potting, or are made of sound-permeable materials such as rubber vulcanization; the upper sealing layer 3 can be a cylindrical structure or an annular structure; the upper sealing layer 3 has a limiting groove structure; the upper sealing layer making mold 4 and the lower sealing layer making mold 6 are made of metal; the watertight potting layer 7 is made of polyurethane material, or a material having watertight properties after curing such as epoxy resin.

[0051] Among them, the fixing method between the piezoelectric ceramic ring 1 and the upper sealing layer 3 and the lower sealing layer 5 is glue bonding, or polyurethane curing or other bonding methods; the method of fixing the upper sealing layer 3 to the metal baffle 2 is glue bonding, or polyurethane curing or other bonding methods; the outer potting mold 8 and the bottom potting mold 9 are integrated or spliced ​​designs; the outer potting mold 8 and the bottom potting mold 9 are made of metal; the fixing bolt 10 can achieve the height and position fixing function. In the variation, the fixing bolt 10 can be replaced by equipment with height and position fixing functions such as fixing fixtures and hoisting equipment.

[0052] The present invention also provides a method for integrally forming a watertight device of a circular ring transducer, and watertightness is achieved by using the integrally forming watertight device of the circular ring transducer.

[0053] More specifically, the present invention realizes the sealing of the inner cavity of the annular transducer by manufacturing and bonding the upper sealing layer 3 and the lower sealing layer 5, and cooperates with the metal baffle 2, and further performs the process of filling the sealed cavity with oil, so as to manufacture a slow waveguide annular transducer, and realizes a better watertight packaging of the slow waveguide annular transducer. The positioning structure is made of watertight materials, and the positioning structure will be sealed inside the transducer, which does not affect the watertight manufacturing effect of the transducer.

[0054] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A ring transducer integrally formed watertight device, characterized in that: include: A piezoelectric ceramic ring (1), a metal baffle (2), an upper sealing layer (3), a lower sealing layer (5), an outer potting mold (8), a bottom potting mold (9), and a fixing member; The upper sealing layer (3), the piezoelectric ceramic ring (1), and the lower sealing layer (5) are fixed in sequence from top to bottom to form a transducer potting body; The upper sealing layer (3) is fixedly mounted below the metal baffle (2); The fixing member mounts the transducer potting body on the outer potting mold (8) and the bottom potting mold (9).

2. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The piezoelectric ceramic ring (1) is inserted into the limiting groove of the upper sealing layer (3) for fixation.

3. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The upper sealing layer (3) is bonded to the limiting groove of the metal baffle (2) for fixation.

4. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The space between the transducer potting body, the outer potting mould (8) and the bottom potting mould (9) constitutes the filling space of the watertight potting layer (7).

5. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The piezoelectric ceramic ring (1) is a tangentially polarized mosaic ring.

6. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The metal baffle (2) has a concave-convex structure or is frosted at the edge.

7. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The metal baffle plate (2) is provided with a limiting groove at a fixed position between the metal baffle plate (2) and the upper sealing layer (3).

8. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The upper sealing layer (3) is a cylindrical structure or an annular structure.

9. The ring transducer integrally formed watertight device according to claim 1, characterized in that: The outer potting mold (8) and the bottom potting mold (9) are of integrated or spliced ​​design; the fixing member is used to fix the height and position.

10. A method for integrally forming a ring transducer in a watertight manner, characterized in that: The ring transducer integrally formed watertight device according to any one of claims 1 to 9 is used for watertightness.

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