Pressure-resistant hydrophone transducer

Abstract

The invention discloses a pressure-resistant hydrophone transducer, and belongs to the technical field of hydrophone transducers, the pressure-resistant hydrophone transducer comprises a pressure-bearing sound transmission cylinder, a piezoelectric ceramic assembly is arranged in a mounting groove of the pressure-bearing sound transmission cylinder, a filling layer is filled between the inner wall of the mounting groove and the piezoelectric ceramic assembly, and the piezoelectric ceramic assembly comprises two stacked piezoelectric ceramic ring pieces. The two piezoelectric ceramic ring pieces are respectively connected with a connecting wire, the connecting wire penetrates through the filling layer and then penetrates out of the pressure-bearing sound-transmitting cylinder through the notch, the plane side walls of the two piezoelectric ceramic ring pieces are respectively connected with a plug, each plug comprises a sealing part and a connecting part, the sealing parts cover inner rings on the plane side walls of the piezoelectric ceramic ring pieces, and the connecting parts cover outer rings on the plane side walls of the piezoelectric ceramic ring pieces. A closed air cavity is formed between the two piezoelectric ceramic ring pieces and the two sealing parts, the connecting parts are fixedly connected with the sealing parts, and the two connecting parts are detachably connected. The pressure-resistant hydrophone transducer adopting the structure is simple in structure, convenient to assemble and produce, high in pressure resistance, not prone to deformation and suitable for being used in a high-pressure environment of a 6000-meter deep sea.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydroacoustic transducers, and in particular relates to a pressure-resistant hydroacoustic transducer. Background Art

[0002] A hydrophone, also known as an underwater microphone, is a transducer that converts underwater acoustic signals into electrical signals. Depending on the sensitivity of the material used, hydrophones can be categorized as piezoelectric ceramic hydrophones, PVDF hydrophones, piezoelectric composite hydrophones, and fiber optic hydrophones. Piezoelectric ceramic hydrophones are currently the most widely used. Hydrophones are widely used in underwater communications, exploration, target positioning, and tracking. They are essential components of sonar systems. Underwater detection, identification, communication, marine environmental monitoring, and marine resource development all rely on underwater acoustic transducers.

[0003] At present, the deep-sea hydrophones in the existing technology have a complex structure and are not easy to assemble and produce. For example, the Chinese patent with application number CN202323043154.2 provides a pressure-resistant bending hydrophone, including a three-laminate assembly, a pressure-bearing sound-transmitting tube, an acoustic coupling layer, a plug, and a transmission cable. A filling layer is installed in the pressure-bearing sound-transmitting tube, and the three-laminate assembly is installed in the filling layer. The plug is installed on the top of the pressure-bearing sound-transmitting tube, and the transmission cable is installed in the plug; the three-laminate assembly includes a left piezoelectric ceramic sheet, a left metal beam, a right piezoelectric ceramic sheet, a right metal beam and an air cavity. The left piezoelectric ceramic sheet is installed on the left surface of the left metal beam, and the right piezoelectric ceramic sheet is installed on the right surface of the right metal beam. The left metal beam and the right metal beam are connected to form a closed air cavity, and the left metal beam and the right metal beam are connected to form a closed air cavity.

[0004] The aforementioned structure uses a three-ply structure as the sensitive element. While this significantly improves receiving sensitivity while maintaining a small size, the connection method for the three-ply assembly is inconvenient. The left and right metal beams must be sealed together, and the left piezoelectric ceramic sheet must be mounted on the left surface of the left metal beam, while the right piezoelectric ceramic sheet must be mounted on the right surface of the right metal beam. This makes assembly and production of the three-ply assembly inconvenient. Furthermore, the plug in the aforementioned structure not only increases the structural complexity, but also creates a gap between the plug and the filler layer due to factors such as part machining accuracy, reducing the overall pressure resistance of the product and making it susceptible to deformation when used in high-pressure environments such as at depths of 6,000 meters.

[0005] In order to solve the above problems, it is necessary to provide a new type of hydrophone. Summary of the Invention

[0006] The purpose of the present invention is to provide a pressure-resistant hydroacoustic transducer with a simple structure, convenient assembly and production, high pressure resistance and non-deformation, suitable for use in high-pressure environments of 6,000 meters deep sea.

[0007] To achieve the above-mentioned objectives, the present invention provides a pressure-resistant hydrophone transducer, comprising a pressure-bearing acoustic tube, a piezoelectric ceramic assembly is provided in the mounting groove of the pressure-bearing acoustic tube, a filling layer is filled between the inner wall of the mounting groove and the piezoelectric ceramic assembly, the distance from the notch of the mounting groove to the filling layer is smaller than the distance between the notch of the mounting groove and the piezoelectric ceramic assembly, the piezoelectric ceramic assembly comprises two stacked piezoelectric ceramic ring pieces, the two piezoelectric ceramic ring pieces are respectively connected to a connecting wire, the connecting wire passes through the filling layer and then passes through the notch to exit the pressure-bearing acoustic tube, the planar side walls of the two piezoelectric ceramic ring pieces are respectively connected to a plug, the plug comprises a sealing part and a connecting part, the sealing part covers the inner ring on the planar side wall of the piezoelectric ceramic ring piece, a closed air cavity is formed between the two piezoelectric ceramic ring pieces and the two sealing parts, the connecting part is fixedly connected to the sealing part, and the two connecting parts are detachably connected.

[0008] Preferably, the connecting part is located in the sealed air cavity, the sum of the volumes of the two connecting parts is smaller than the volume of the sealed air cavity, the connecting part is a fixing rod fixedly connected to the center of the sealing part, and the two fixing rods are connected by threads.

[0009] Preferably, the connecting part is located in the filling layer, and the connecting part includes two connecting rods fixedly connected to the sealing part, and the two connecting rods are symmetrically arranged on both sides of the piezoelectric ceramic ring sheet. The end of the connecting rod away from the sealing part is provided with an external thread, and the connecting rod on one plug is detachably connected to the connecting rod on the other plug through a connecting sleeve, and the inner wall of the connecting sleeve is provided with an internal thread compatible with the external thread structure.

[0010] Preferably, the sealing portion is provided with a sealing ring located in the closed air cavity, and the sealing ring is adapted to the inner ring structure.

[0011] Preferably, a limiting ring extending inward is provided at the notch of the installation slot.

[0012] Preferably, the sealing portion close to the bottom of the mounting groove is fixedly connected to a support member, and the other end of the support member is connected to the bottom of the mounting groove.

[0013] Preferably, the support member is a hollow structure.

[0014] Preferably, the plug and the filling layer are both made of insulating materials.

[0015] Preferably, the filling layer is made of epoxy resin and is formed by epoxy resin infusion.

[0016] Therefore, the present invention adopts a pressure-resistant hydrophone transducer with the above structure, which has the following beneficial effects:

[0017] 1. Two plugs are used to achieve a sealed connection between the two piezoelectric ceramic rings, and the detachable connection between the connecting parts on the two plugs is used to facilitate the assembly and disassembly of the two piezoelectric ceramic rings.

[0018] 2. No plug is provided at the pressure-bearing sound-transmitting tube, which simplifies the overall structure and facilitates production. At the same time, it can avoid the formation of gaps between the pressure-bearing sound-transmitting tube and the filling layer, thereby improving the pressure resistance of the pressure-bearing sound-transmitting tube and avoiding deformation of the pressure-bearing sound-transmitting tube.

[0019] 3. The use of the support member is conducive to placing the piezoelectric ceramic ring in the middle of the filling layer, thereby improving the consistency of the performance of the hydroacoustic transducer product. The hollow design of the support member can increase the connection strength between the support member and the filling layer formed by the pouring.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a cross-sectional view of Example 1 of a pressure-resistant hydroacoustic transducer according to the present invention;

[0022] Figure 2 This is an exploded view of Example 1 of a pressure-resistant hydroacoustic transducer of the present invention without a filling layer;

[0023] Figure 3 This is a schematic diagram of the overall structure of a pressure-resistant hydrophone transducer according to embodiment 1 of the present invention;

[0024] Figure 4 2 is a cross-sectional view of a pressure-resistant hydroacoustic transducer according to embodiment 2 of the present invention;

[0025] Figure 5 This is an exploded view of Example 2 of a pressure-resistant hydroacoustic transducer of the present invention without a filling layer.

[0026] In the figure: 1. Pressure-bearing sound-transmitting tube; 2. Filling layer; 3. Piezoelectric ceramic ring; 4. Connecting wire; 51. Sealing part; 52. Fixing rod; 53. Connecting rod; 54. Connecting sleeve; 6. Sealed air cavity; 7. Sealing ring; 8. Limiting ring; 9. Support member. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] Reference Figure 1-3 As shown, this embodiment provides a pressure-resistant hydrophone transducer, including a pressure-resistant acoustic tube 1. A piezoelectric ceramic assembly is provided in the mounting groove of the pressure-resistant acoustic tube 1, and a filling layer 2 is filled between the inner wall of the mounting groove and the piezoelectric ceramic assembly. The distance between the notch of the mounting groove and the filling layer 2 is less than the distance between the notch of the mounting groove and the piezoelectric ceramic assembly, so that the piezoelectric ceramic assembly is completely located within the filling layer 2. The piezoelectric ceramic assembly includes two stacked piezoelectric ceramic rings 3, each of which is connected to a connecting wire 4. The connecting wire 4 passes through the filling layer 2 and then exits the pressure-resistant acoustic tube 1 through the notch. The planar side walls of the two piezoelectric ceramic rings 3 are respectively connected to a plug, which includes a sealing portion 51 and a connecting portion. The sealing portion 51 covers the inner ring on the planar side wall of the piezoelectric ceramic ring 3. The surface of the sealing portion 51 in contact with the filling layer can be either a flat surface or a curved surface. In the curved state, it can disperse pressure and thus improve the pressure resistance of the product. A closed air cavity 6 is formed between the two piezoelectric ceramic rings 3 and the two sealing portions 51. The connecting portion is fixedly connected to the sealing portion 51 , and the two connecting portions are detachably connected.

[0031] During assembly, two plugs are used to achieve a removable, sealed connection between the two piezoelectric ceramic rings 3. The enclosed air cavity 6 formed between the two piezoelectric ceramic rings 3 and the two sealing portions 51 can adjust the acoustic properties to optimize the performance of the hydrophone. The piezoelectric ceramic assembly is then suspended in the center of the mounting slot of the pressure-bearing acoustic tube 1 using an external device connected to the connecting wire 4. The filling layer 2 is then filled. The filling layer 2 and the pressure-bearing acoustic tube 1 provide support and protection for the piezoelectric ceramic rings 3. The entire assembly process is simple and quick, improving the production efficiency of hydrophone transducers.

[0032] In a further preferred embodiment, the connecting portion is located within the sealed air cavity, and the combined volume of the two connecting portions is less than the volume of the sealed air cavity 6. The connecting portion comprises a fixing rod 52 fixedly connected to the center of the sealing portion 51, and the two fixing rods 52 are connected by a threaded connection. One fixing rod 52 is provided with an internal thread, and the other fixing rod 52 is provided with an external thread. The threaded connection between the two fixing rods 52 is achieved by rotating the sealing portion 51. Once the two fixing rods 52 are connected, the two sealing portions 51 can securely connect the two stacked piezoelectric ceramic rings 3.

[0033] In a further preferred embodiment, a sealing ring 7 is provided on the sealing portion 51 and is located in the closed air cavity 6 . The sealing ring 7 is adapted to the inner ring structure and can increase the sealing performance of the closed air cavity 6 .

[0034] In a further preferred embodiment, the plug and the filling layer 2 are both made of insulating materials, and the material of the sealing portion 51 in the plug can be alumina.

[0035] In a further preferred embodiment, the filling layer 2 is made of epoxy resin and is formed by epoxy resin infusion.

[0036] In a further preferred embodiment, the notch of the mounting groove is provided with an inwardly extending limiting ring 8. When filling the filling layer 2, the top of the filling layer 2 contacts or exceeds the limiting ring 8, which can increase the connection strength between the filling layer 2 and the pressure-bearing sound-transmitting tube 1.

[0037] In a further preferred embodiment, the sealing portion 51 near the bottom of the mounting groove is fixedly connected to the support member 9, and the other end of the support member 9 is connected to the bottom of the mounting groove. The support member 9 facilitates the location of the piezoelectric ceramic assembly in the middle of the mounting groove of the pressure-bearing acoustic tube 1, replacing the traditional production process of using an external device to connect with the connecting wire 4 and then suspending the piezoelectric ceramic assembly in the middle of the mounting groove of the pressure-bearing acoustic tube 1, thereby improving the accuracy and consistency of the position of the piezoelectric ceramic assembly in the pressure-bearing acoustic tube 1, thereby improving the consistency of the performance of the transducer product. The material of the support member 9 is the same as that of the filling layer 2, ensuring the consistency of the transmission of sound waves in the filling layer 2.

[0038] In a further preferred embodiment, the support member 9 is a hollow structure. The hollow design enables the filling layer 2 to enter the interior of the support member 9 during filling, thereby increasing the connection strength between the support member 9 and the filling layer 2. When in use, the structure of the support member 9 can be a cylindrical support member 9 that is compatible with the inner ring structure of the limiting ring 8, and the cylindrical support member 9 has a plurality of hollow holes. When the notch of the mounting slot does not have a limiting ring 8, the structure of the support member 9 can be a cylindrical support member 9 that is compatible with the notch structure, and the cylindrical support member 9 has a plurality of hollow holes, thereby ensuring that the piezoelectric ceramic component is located in the middle of the pressure-bearing acoustic tube 1, thereby ensuring the performance consistency of the hydrophone.

[0039] Example 2

[0040] Reference Figure 4-5As shown, the structure of this embodiment is substantially the same as that of embodiment 1, with the only difference being that the connecting portion is located inside the filling layer 2, and the connecting portion includes two connecting rods 53 fixedly connected to the sealing portion 51. The two connecting rods 53 are symmetrically arranged on both sides of the piezoelectric ceramic ring piece 3, and the end of the connecting rod 53 away from the sealing portion 51 is provided with an external thread. The connecting rod 53 on one plug is detachably connected to the connecting rod 53 on the other plug through a connecting sleeve 54, and the inner wall of the connecting sleeve 54 is provided with an internal thread that is compatible with the external thread structure. When in use, the detachable connection of the two plugs can be achieved through the connecting sleeve 54, and at the same time, the sealing portion 51 can stack and fix the two piezoelectric ceramic ring pieces 3. The connecting rod 53 is made of the same material as the filling layer 2, ensuring the consistency of the transmission of sound waves in the filling layer 2.

[0041] Therefore, the present invention adopts a pressure-resistant hydroacoustic transducer with the above structure, which has a simple structure and is easy to assemble and produce. At the same time, it has high pressure resistance and is not easy to deform, and is suitable for use in a high-pressure environment of 6,000 meters deep sea.

[0042] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A pressure-resistant hydrophone transducer, characterized by: The invention comprises a pressure-bearing sound-transmitting cylinder (1), wherein a piezoelectric ceramic component is provided in a mounting groove of the pressure-bearing sound-transmitting cylinder (1), a filling layer (2) is filled between the inner wall of the mounting groove and the piezoelectric ceramic component, a distance from the notch of the mounting groove to the filling layer (2) is smaller than a distance from the notch of the mounting groove to the piezoelectric ceramic component, and the piezoelectric ceramic component comprises two stacked piezoelectric ceramic ring pieces (3), the two piezoelectric ceramic ring pieces (3) are respectively connected to a connecting wire (4), and the connecting wire (4) passes through The filling layer (2) passes through the pressure-bearing sound-transmitting tube (1) through the slot, and the planar side walls of the two piezoelectric ceramic ring pieces (3) are respectively connected to a plug, and the plug includes a sealing part (51) and a connecting part, and the sealing part (51) covers the inner ring on the planar side wall of the piezoelectric ceramic ring piece (3), and a closed air cavity (6) is formed between the two piezoelectric ceramic ring pieces (3) and the two sealing parts (51), and the connecting part is fixedly connected to the sealing part (51), and the two connecting parts are detachably connected.

2. The pressure-resistant hydrophone transducer according to claim 1, characterized in that: The connecting portion is located in the sealed air cavity, the sum of the volumes of the two connecting portions is smaller than the volume of the sealed air cavity (6), the connecting portion is a fixing rod (52) fixedly connected to the center of the sealing portion (51), and the two fixing rods (52) are connected by threads.

3. The pressure-resistant hydrophone transducer according to claim 1, characterized in that: The connecting portion is located in the filling layer (2), and the connecting portion includes two connecting rods (53) fixedly connected to the sealing portion (51). The two connecting rods (53) are symmetrically arranged on both sides of the piezoelectric ceramic ring (3). One end of the connecting rod (53) away from the sealing portion (51) is provided with an external thread. The connecting rod (53) on one plug is detachably connected to the connecting rod (53) on the other plug through a connecting sleeve (54), and the inner wall of the connecting sleeve (54) is provided with an internal thread that is compatible with the external thread structure.

4. The pressure-resistant hydrophone transducer according to claim 1, characterized in that: The sealing portion (51) is provided with a sealing ring (7) located in the closed air cavity (6), and the sealing ring (7) is adapted to the inner ring structure.

5. The pressure-resistant hydrophone transducer according to claim 1, characterized in that: A limiting ring (8) extending inwards is provided at the notch of the installation slot.

6. The pressure-resistant hydrophone transducer according to claim 1, characterized in that: The sealing portion (51) close to the bottom of the installation groove is fixedly connected to the support member (9), and the other end of the support member (9) is connected to the bottom of the installation groove.

7. The pressure-resistant hydrophone transducer according to claim 5, characterized in that: The support member (9) is a hollow structure.

8. The pressure-resistant hydrophone transducer according to claim 1, characterized in that: The plug and the filling layer (2) are both made of insulating materials.

9. The pressure-resistant hydrophone transducer according to claim 1, characterized in that: The filling layer (2) is made of epoxy resin, and is formed by pouring epoxy resin.

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