High thermal conductivity, wide-angle high-frequency, high-power sound source

Abstract

This invention relates to a high thermal conductivity, large-aperture, high-frequency, high-power sound source comprising: a titanium alloy central rod, a titanium alloy upper cover, a cylindrical radiating shell, a titanium alloy lower cover, piezoelectric ceramic sheets, electrode sheets, insulating pads, a non-metallic central support, an upper structural component, a lower structural component, and a waterproof adhesive layer. The titanium alloy central rod is fixed to the center of the titanium alloy lower cover. The non-metallic central support is fitted onto the outside of the titanium alloy central rod. The titanium alloy upper cover is fixed to the upper end of the non-metallic central support. Insulating pads are respectively installed at the lower end of the titanium alloy upper cover and the upper end of the titanium alloy lower cover. Between the insulating pads, on the outside of the non-metallic central support, several sets of piezoelectric ceramic sheets and electrode sheets are installed. A cylindrical radiating shell is fitted around the outer circumference of the titanium alloy upper cover, titanium alloy lower cover, insulating pads, piezoelectric ceramic sheets, and electrode sheets. The upper structural component covers the upper end face of the cylindrical radiating shell and the upper end face of the titanium alloy upper cover. The lower structural component covers the lower end face of the titanium alloy lower cover. A waterproof adhesive layer covers the outside of the aforementioned device.

Description

Technical Field

[0001] This patent belongs to the field of underwater acoustic transducer engineering technology, and specifically relates to a high-frequency, high-power sound source with high thermal conductivity and a large opening angle. Background Technology

[0002] The propagation distance of sound waves in water is closely related to parameters such as frequency and source level. According to the sonar equation, the larger the source level, the farther the sound waves will propagate in water. However, underwater acoustic transducers will encounter various reliability problems when used in high-source-level emission applications, such as the piezoelectric element overheating during long-term operation. Due to the watertight design, underwater acoustic transducers are often wrapped with a layer of sound-permeable polyurethane rubber. This material is a heat-insulating material, which is not conducive to heat dissipation of the transducer. This will further cause the heat generated by the transducer to accumulate, causing the element temperature to exceed the Curie temperature of the piezoelectric material, thus causing permanent damage to the transducer's emission performance.

[0003] To ensure good thermal conductivity, designers often expose parts of the transducer's metal structure directly to water, utilizing the high thermal conductivity of metal to mitigate heat generation during high-power operation. However, this leads to a common grounding issue when the transducer's negative electrode is in contact with the water medium, potentially affecting the acoustic system's performance. Furthermore, high-frequency, high-power transducers are often designed as composite rod transducers, which have a small directional opening angle and a narrow operating bandwidth, making them unsuitable for overall design requirements. Therefore, a transducer design with high thermal efficiency is urgently needed to achieve high-power, omnidirectional sound emission from high-frequency sound sources. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing transducers and provide a high-frequency, high-power omnidirectional transducer with high thermal conductivity.

[0005] To achieve the purpose of this invention, the following technical solution is adopted:

[0006] This invention discloses a high-frequency, high-power sound source with high thermal conductivity and a large opening angle, comprising: a titanium alloy central rod, a titanium alloy upper cover, a cylindrical radiating shell, a titanium alloy lower cover, piezoelectric ceramic sheets, electrode sheets, insulating gaskets, a non-metallic central support component, an upper structural component, a lower structural component, and a waterproof adhesive layer. The titanium alloy central rod is fixed to the center of the lower end of the titanium alloy lower cover. The non-metallic central support component is fitted onto the outside of the titanium alloy central rod. The titanium alloy upper cover is fixed to the upper end of the non-metallic central support component. An insulating gasket is installed at the lower end of the titanium alloy upper cover and the upper end of the titanium alloy lower cover. A plurality of sets of piezoelectric ceramic sheets and electrode sheets are sequentially installed on the outside of the non-metallic central support component between the two insulating gaskets. The piezoelectric ceramic sheets and electrode sheets are assembled alternately. The insulating gaskets are in contact with the titanium alloy upper cover, titanium alloy lower cover, two insulating gaskets, and several sets of piezoelectric ceramic plates and electrode plates. A cylindrical radiating shell is fitted around the outer circumference of the cylindrical radiating shell. Several pins are used to fix it to the titanium alloy upper cover on the circumference near the upper end of the cylindrical radiating shell. Several screws are used to fix it to the titanium alloy lower cover on the circumference of the lower end of the cylindrical radiating shell. The upper structural component covers the upper end face of the cylindrical radiating shell and the upper end face of the titanium alloy upper cover. The lower structural component covers the lower end face of the titanium alloy lower cover. The upper end of the titanium alloy central rod is higher than the upper end of the upper structural component. A waterproof adhesive layer covers the outer side of the cylindrical radiating shell, the outer side of the lower structural component, and the outer side of the upper structural component. The waterproof adhesive layer covers the upper structural component and is flush with the upper end of the titanium alloy central rod.

[0007] The present invention relates to a high thermal conductivity, large opening angle, high frequency, high power sound source, wherein: the upper end of the titanium alloy central rod is provided with a boss, the titanium alloy upper cover is fixed on the lower end of the boss, and an annular groove is formed on the circumference of the boss.

[0008] The present invention relates to a high thermal conductivity, large opening angle, high frequency, high power sound source, wherein the piezoelectric ceramic sheet, electrode sheet, and insulating pad are disc-shaped, have the same diameter, and are fitted on the outside of a non-metallic central support.

[0009] The present invention relates to a high thermal conductivity, large opening angle, high-frequency, high-power sound source, wherein the titanium alloy upper cover and titanium alloy lower cover are disc-shaped, and their diameters are the same and larger than the diameter of the insulating gasket.

[0010] The present invention relates to a high thermal conductivity, large opening angle, high-frequency, high-power sound source, wherein the lower structural component is disc-shaped and its diameter is larger than that of the titanium alloy lower cover.

[0011] The present invention relates to a high thermal conductivity, large opening angle, high-frequency, high-power sound source, wherein the upper and lower structural components are made of rigid polyurethane foam.

[0012] The present invention relates to a high thermal conductivity, large opening angle, high frequency, high power sound source, wherein the waterproof adhesive layer is made of watertight polyurethane material.

[0013] The present invention relates to a high thermal conductivity, large opening angle, high-frequency, high-power sound source, wherein the pins and screws are made of stainless steel.

[0014] The present invention relates to a high thermal conductivity, large opening angle, high frequency, high power sound source, wherein the titanium alloy central rod is fixed to the lower end of the titanium alloy lower cover through a connecting threaded hole.

[0015] The high thermal conductivity, large opening angle, high frequency, high power sound source of the present invention comprises: uniformly applying high temperature epoxy resin to both ends of the piezoelectric ceramic sheet, electrode sheet, and insulating gasket; uniformly applying high temperature epoxy resin to the lower end of the titanium alloy upper cover and the upper end of the titanium alloy lower cover in contact with the insulating gasket; and uniformly applying epoxy resin to the connecting threaded hole of the titanium alloy lower cover and the titanium alloy central rod connected to the connecting threaded hole.

[0016] The beneficial effects of the high thermal conductivity, large opening angle, high-frequency, high-power sound source of the present invention

[0017] 1. The high thermal conductivity high-frequency high-power omnidirectional transducer proposed in this invention has horizontal omnidirectional properties. At the same time, it conducts the heat generated during crystal stack operation to the water medium through a titanium alloy central rod with a high thermal conductivity. Meanwhile, due to the insulating pads isolating the voltage load from the water medium, the high-frequency sound source has horizontal omnidirectional properties and high thermal conductivity, while the positive and negative poles of the sound source are not connected to the water medium.

[0018] 2. This invention controls the vertical directivity of the sound source through finite element optimization design of the upper and lower structural components of rigid polyurethane foam, which can further improve the high-frequency emission voltage response of the transducer. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the high thermal conductivity, large opening angle high-frequency, high-power sound source of the present invention.

[0020] Figure 2 This is a 3D view of the titanium alloy lower cover;

[0021] Figure 3 The emission voltage response level curve of the high thermal conductivity, large opening angle high-frequency high-power sound source of the present invention is shown.

[0022] exist Figure 1 In the diagram, 1 is the titanium alloy center rod; 2 is the titanium alloy top cover; 3 is the cylindrical radiating shell; 4 is the titanium alloy bottom cover; 5 is the piezoelectric ceramic sheet; 6 is the electrode sheet; 7 is the insulating gasket; 8 is the non-metallic center support; 9 is the upper structural component; 10 is the lower structural component; 11 is the waterproof adhesive layer; 12 is the pin; 13 is the screw; 14 is the boss; 15 is the groove; and 16 is the wiring hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0024] like Figure 1 As shown, the high thermal conductivity, large opening angle high-frequency high-power sound source of the present invention includes: a titanium alloy central rod 1, a titanium alloy upper cover 2, a cylindrical radiating shell 3, a titanium alloy lower cover 4, a piezoelectric ceramic sheet 5, an electrode sheet 6, an insulating pad 7, a non-metallic central support 8, an upper structural component 9, a lower structural component 10, and a waterproof adhesive layer 11. The titanium alloy central rod 1 is fixed to the center of the lower end of the titanium alloy lower cover 4. The non-metallic central support 8 is fitted on the outside of the titanium alloy central rod 1. The upper end of the titanium alloy central rod 1 is provided with a boss 14, and an annular groove 15 is opened on the circumference of the boss 14. The titanium alloy top cover 2 is fixed to the upper end of the non-metallic central support 8 and the lower end of the boss 14. An insulating gasket 7 is installed at the lower end of the titanium alloy top cover 2 and the upper end of the titanium alloy bottom cover 4. Several sets of piezoelectric ceramic sheets 5 and electrode sheets 6 are sequentially installed on the outside of the non-metallic central support 8 between the two insulating gaskets 7. The piezoelectric ceramic sheets 5 and electrode sheets 6 are arranged alternately. The piezoelectric ceramic sheets 5, electrode sheets 6, and insulating gaskets 7 are disc-shaped with the same diameter and are fitted onto the outside of the non-metallic central support 8. The piezoelectric ceramic sheets 5 are in contact with the insulating gaskets 7. The titanium alloy top cover 2 and titanium alloy bottom cover 4 are disc-shaped with the same diameter, which is larger than the diameter of the insulating gaskets 7. A cylindrical radiating shell 3 is fitted around the outer circumference of the titanium alloy upper cover 2, the titanium alloy lower cover 4, two insulating gaskets 7, and several sets of piezoelectric ceramic plates 5 and electrode plates 6. The upper cover 3 is fixed to the titanium alloy upper cover 2 by several pins 12 on the circumference near the upper end of the cylindrical radiating shell 3, and the lower cover 4 is fixed to the titanium alloy lower cover 4 by several screws 13 on the circumference of the lower end of the cylindrical radiating shell 3. The upper structural component 9 covers the upper end face of the cylindrical radiating shell 3 and the upper end face of the titanium alloy upper cover 2, and the lower structural component 10 covers the lower end face of the titanium alloy lower cover 4. The lower structural component 10 is disc-shaped and its diameter is larger than that of the titanium alloy lower cover 4. The upper end of the titanium alloy center rod 1 is higher than the upper end of the upper structural member 9. The waterproof adhesive layer 11 covers the outer side of the cylindrical radial shell 3, the outer side of the lower structural member 10, and the outer side of the upper structural member 9. The waterproof adhesive layer 11 covers the upper structural member 9 and is flush with the upper end of the titanium alloy center rod 1. The upper structural member 9 and the lower structural member 10 are made of rigid polyurethane foam. The waterproof adhesive layer 11 is made of watertight polyurethane material. The pin 12 and screw 13 are made of stainless steel material.

[0025] The titanium alloy center rod 1 is fixed to the lower end of the titanium alloy lower cover 4 through the connecting threaded hole. High-temperature epoxy resin is uniformly applied to both ends of the piezoelectric ceramic sheet 5, electrode sheet 6 and insulating gasket 7. High-temperature epoxy resin is uniformly applied to the lower end of the titanium alloy upper cover 2 and the upper end of the titanium alloy lower cover 4 that are in contact with the insulating gasket 7. Epoxy resin is uniformly applied to the connecting threaded hole of the titanium alloy lower cover 4 and the titanium alloy center rod 1 connected to the above-mentioned connecting threaded hole.

[0026] The expansion and contraction vibration of a crystal stack composed of piezoelectric ceramic sheet 5, electrode sheet 6, and insulating pad 7 is driven by the vibration displacement amplification effect of titanium alloy upper cover 2, titanium alloy lower cover 4, and cylindrical radiating shell 3, thus completing the development of a high-frequency, high-power sound source. Due to the axial symmetry of its structure, the horizontal directivity of this sound source is theoretically omnidirectional. At the same time, since the center of the sound source is the titanium alloy central rod 1, which has a high thermal conductivity, it can conduct the heat generated during the operation of the crystal stack to the water medium. Furthermore, since the insulating pad 7 isolates the voltage load from the water medium, this sound source, while possessing high thermal conductivity, is not conductive between the positive and negative poles of the sound source and the water medium, as detailed below:

[0027] First, high-temperature epoxy resin is evenly applied to both ends of the piezoelectric ceramic sheet 5, electrode sheet 6, and insulating gasket 7. Epoxy resin is also evenly applied to the contact points between the titanium alloy upper cover 2, titanium alloy lower cover 4 and the insulating gasket 7, the titanium alloy central rod 1 and the titanium alloy upper cover 2, and the connecting threads between the titanium alloy central rod 1 and the titanium alloy lower cover 4. The piezoelectric ceramic sheet 5, electrode sheet 6, insulating gasket 7, non-metallic central support 8, and titanium alloy upper cover 2 and titanium alloy lower cover 4 are then connected by the titanium alloy central rod 1 to form the following structure: Figure 1 The driving crystal stack shown features a non-metallic central support 8 that enhances the insulation of the crystal stack and the coaxiality of structures such as the piezoelectric ceramic sheet 5. When tightening the threads connecting the titanium alloy central rod 1 and the titanium alloy lower cover 4, a fixed torque is applied using a torque wrench to ensure consistent prestress in the transducer. Insulating gaskets 7 are present on both sides of the crystal stack of this sound source to isolate the voltage load from the water medium. Furthermore, the mold design places the upper side of the titanium alloy central rod 1 of the transducer in direct contact with the water medium, ensuring high thermal conductivity of the transducer.

[0028] Secondly, after the epoxy resin inside the driving crystal stack has cured, epoxy resin is applied to the contact points between the titanium alloy upper cover 2 and the cylindrical radiating shell 3, and between the titanium alloy lower cover 4 and the cylindrical radiating shell 3. The titanium alloy upper cover 2 and the cylindrical radiating shell 3 are then fixed with pins 12, and the titanium alloy lower cover 4 and the cylindrical radiating shell 3 are connected with stainless steel screws 13 to form a cylindrical vibration structure. In particular, to reduce the processing cost of the cylindrical radiating shell 3, the cylindrical radiating shell 3 is optimized using finite element analysis, and designed as a structure with an outer cylindrical shape and an inner spherical surface. This reduces processing costs while providing a better vibration displacement amplification effect.

[0029] Furthermore, the dimensions of the upper structural component 9 and the lower structural component 10 of the rigid polyurethane foam were optimized through finite element simulation to improve the electroacoustic performance of the transducer. The optimized upper and lower structural components 9 and 10 were then bonded to the upper and lower sides of the transducer using fast-curing adhesive to complete the transducer assembly. Two wiring holes 16 (e.g., on the lower structural component 10 of the rigid polyurethane foam and the titanium alloy lower cover 4) were designed. Figure 2 As shown, the positive and negative electrodes of the piezoelectric ceramic sheet 5 are connected in parallel and led out through the wiring hole 16. The wiring hole 16 is then blocked with fast-curing adhesive and placed into the transducer casting mold to complete the casting.

[0030] like Figure 1 The high-frequency, high-power omnidirectional transducer, as shown, is cast with high thermal conductivity. The transducer's emitter voltage response level curve is as follows: Figure 3 As shown, the horizontal axis represents frequency normalization. Through the design of structural parameters using finite element analysis and the directional control of the upper structural component 9 and the lower structural component 10 of the rigid polyurethane foam, the sound source is omnidirectional in the horizontal direction and has a good high-frequency emission voltage response within the operating frequency range.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the rights involved.

Claims

1. A high-frequency, high-power sound source with high thermal conductivity and a large opening angle, comprising: The titanium alloy center rod (1), titanium alloy top cover (2), cylindrical radiating shell (3), titanium alloy bottom cover (4), piezoelectric ceramic sheet (5), electrode sheet (6), insulating gasket (7), non-metallic center support (8), upper structural component (9), lower structural component (10), and waterproof adhesive layer (11) are characterized in that: the titanium alloy center rod (1) is fixed at the center of the lower end of the titanium alloy bottom cover (4), the non-metallic center support (8) is fitted on the outside of the titanium alloy center rod (1), and the titanium alloy top cover... (2) An insulating pad (7) is fixed on the upper end of the non-metallic central support (8), and an insulating pad (7) is installed on the lower end of the titanium alloy upper cover (2) and the upper end of the titanium alloy lower cover (4). Several sets of piezoelectric ceramic plates (5) and electrode plates (6) are installed sequentially on the outside of the non-metallic central support (8) between the two insulating pads (7). The piezoelectric ceramic plates (5) and electrode plates (6) are assembled alternately. The piezoelectric ceramic plates (5) are in contact with the insulating pads (7). A cylindrical radiating shell (3) is fitted around the outer circumference of two insulating pads (7), several sets of piezoelectric ceramic plates (5), and electrode plates (6). The upper circumference of the cylindrical radiating shell (3) is fixed to the titanium alloy top cover (2) by several pins (12), and the lower circumference of the cylindrical radiating shell (3) is fixed to the titanium alloy bottom cover (4) by several screws (13). The upper structural component (9) covers the upper end face of the cylindrical radiating shell (3) and the titanium alloy top cover. (2) On the upper surface, the lower structural member (10) covers the lower surface of the titanium alloy lower cover (4), the upper end of the titanium alloy central rod (1) is higher than the upper end of the upper structural member (9), and the waterproof adhesive layer (11) covers the outer side of the cylindrical radiating shell (3), the outer side of the lower structural member (10) and the outer side of the upper structural member (9). The waterproof adhesive layer (11) covers the upper structural member (9) and is flush with the upper end of the titanium alloy central rod (1); the upper structural member (9) and the lower structural member (10) are made of rigid polyurethane foam.

2. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 1, characterized in that: The upper end of the titanium alloy center rod (1) is provided with a boss (14), and the titanium alloy upper cover (2) is fixed on the lower end of the boss (14). A circular groove (15) is opened on the circumference of the boss (14).

3. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 2, characterized in that: The piezoelectric ceramic sheet (5), electrode sheet (6) and insulating pad (7) are disc-shaped and have the same diameter. They are fitted on the outside of the non-metallic central support (8).

4. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 3, characterized in that: The titanium alloy upper cover (2) and titanium alloy lower cover (4) are disc-shaped, and their diameters are the same and larger than the diameter of the insulating pad (7).

5. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 4, characterized in that: The lower structural component (10) is disc-shaped, and its diameter is larger than that of the titanium alloy lower cover (4).

6. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 5, characterized in that: The waterproof adhesive layer (11) is made of watertight polyurethane material.

7. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 6, characterized in that: The pin (12) and screw (13) are made of stainless steel.

8. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 7, characterized in that: The titanium alloy center rod (1) is fixed to the lower end of the titanium alloy lower cover (4) through a connecting threaded hole.

9. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as described in claim 8, characterized in that: High-temperature epoxy resin is uniformly applied to both ends of the piezoelectric ceramic sheet (5), electrode sheet (6) and insulating pad (7). High-temperature epoxy resin is uniformly applied to the lower end of the titanium alloy upper cover (2) and the upper end of the titanium alloy lower cover (4) that are in contact with the insulating pad (7). Epoxy resin is uniformly applied to the connecting thread hole of the titanium alloy lower cover (4) and the titanium alloy center rod (1) connected to the connecting thread hole.

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