High-frequency high-power sound source with high heat conduction efficiency and large opening angle

Abstract

The invention discloses a high-heat-conduction-efficiency large-opening-angle high-frequency high-power sound source which comprises a titanium alloy center rod, a titanium alloy upper cover, a cylindrical radiation shell, a titanium alloy lower cover, a piezoelectric ceramic piece, an electrode piece, an insulation spacer, a non-metal center supporting piece, an upper structural piece, a lower structural piece and a waterproof glue layer. The titanium alloy center rod is sleeved with the non-metal center supporting piece, the titanium alloy upper cover is fixed to the upper end of the non-metal center supporting piece, the lower end of the titanium alloy upper cover and the upper end of the titanium alloy lower cover are each provided with an insulating spacer, and a plurality of sets of piezoelectric ceramic pieces and electrode pieces are installed on the outer side of the non-metal center supporting piece between the insulating spacers. A cylindrical radiation shell is sleeved on the outer circumferences of the titanium alloy upper cover, the titanium alloy lower cover, the insulating spacer, the piezoelectric ceramic piece and the electrode piece, the upper structural member covers the upper end face of the cylindrical radiation shell and the upper end face of the titanium alloy upper cover, the lower structural member covers the lower end face of the titanium alloy lower cover, and the waterproof glue layer covers the outer sides of the devices.

Description

Technical Field

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

[0002] The propagation distance of sound waves in water is closely related to its frequency, source level and other parameters. According to the sonar equation, the greater the source level, the farther the sound waves propagate in water. However, underwater acoustic transducers will have various reliability problems when used in high source level transmission applications, such as heating of piezoelectric components after long-term operation. Due to the watertight design of underwater acoustic transducers, the outside is often wrapped with a layer of sound-transparent polyurethane rubber. This material is a thermal insulation material, which is not conducive to the heat dissipation of the transducer. It will further accumulate the heat generated by the transducer, causing the component temperature to exceed the Curie temperature of the piezoelectric material, thereby causing permanent damage to the transducer's transmission performance.

[0003] In order to make the transducer have good thermal conductivity, designers often put part of the metal structure of the transducer in direct contact with water, using the high thermal conductivity of metal to improve the heating phenomenon of the transducer when working at high power. However, the negative pole of the transducer will be connected to the water medium, resulting in common ground problems when the transducer transmits at high power, which may affect the performance of the acoustic system. At the same time, high-frequency and high-power transmitting transducers are often designed in the form of composite rod transducers, which have a small directivity opening angle and a narrow operating frequency band, making it difficult to meet the overall design requirements. Therefore, a transducer with high thermal conductivity efficiency is urgently needed to achieve high-power, omnidirectional acoustic emission from high-frequency sound sources. Summary of the invention

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

[0005] In order to achieve the invention purpose of this application, this application adopts the following technical solutions:

[0006] The invention discloses a high-frequency, high-power sound source with high thermal conductivity and large opening angle, which comprises: a titanium alloy central rod, a titanium alloy upper cover, a cylindrical radiation shell, a titanium alloy lower cover, a piezoelectric ceramic sheet, an electrode sheet, an insulating gasket, a non-metallic central support, an upper structural member, a lower structural member and a waterproof adhesive layer, wherein: the titanium alloy central rod is fixed at the center of the lower end of the titanium alloy lower cover, the non-metallic central support is sleeved on the outside of the titanium alloy central rod, the titanium alloy upper cover is fixed on the upper end of the non-metallic central support, an insulating gasket is respectively installed at the lower end of the titanium alloy upper cover and the upper end of the titanium alloy lower cover, and a plurality of groups of piezoelectric ceramic sheets and electrode sheets are sequentially installed on the outside of the non-metallic central support between the two insulating gaskets, the piezoelectric ceramic sheets and the electrode sheets are respectively installed alternately, and the piezoelectric ceramic sheets and the electrode sheets are respectively installed alternately. The titanium alloy upper cover and the titanium alloy lower cover are in contact with each other, and the insulating gaskets are in contact with each other. A cylindrical radiation shell is mounted on the outer circumference of the titanium alloy upper cover, the titanium alloy lower cover, two insulating gaskets and several groups of piezoelectric ceramic sheets and electrode sheets. The cylindrical radiation shell is fixed to the titanium alloy upper cover by several pins on the circumferential side close to the upper end of the cylindrical radiation shell, and is fixed to the titanium alloy lower cover on the circumference of the lower end of the cylindrical radiation shell by several screws. The upper structural part covers the upper end surface of the cylindrical radiation shell and the upper end surface of the titanium alloy upper cover, the lower structural part covers the lower end surface of the titanium alloy lower cover, the upper end of the titanium alloy center rod is higher than the upper end of the upper structural part, and the waterproof adhesive layer covers the outer side of the cylindrical radiation shell, the outer side of the lower structural part and the outer side of the upper structural part. The waterproof adhesive layer covers above the upper structural part and is flush with the upper end of the titanium alloy center rod.

[0007] The high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention comprises: a boss is provided at the upper end of the titanium alloy center rod, a titanium alloy upper cover is fixed on the lower end of the boss, and a circular groove is provided on the circumference of the boss.

[0008] The high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention comprises: the piezoelectric ceramic sheet, the electrode sheet and the insulating gasket are in the shape of discs with the same diameter, and they are sleeved on the outside of the non-metallic central support.

[0009] The high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention comprises the following parts: the titanium alloy upper cover and the titanium alloy lower cover are in the shape of discs, and their diameters are the same and larger than the diameter of the insulating gasket.

[0010] The high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention comprises: the lower structural member is in the shape of a disk, and its diameter is larger than the diameter of the titanium alloy lower cover.

[0011] The high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention, wherein: the upper structural member and the lower structural member are made of polyurethane hard foam.

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

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

[0014] The high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention comprises: the titanium alloy center rod is fixed to the lower end of the titanium alloy lower cover through a connecting threaded hole.

[0015] The high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention comprises: high-temperature epoxy resin is evenly applied on both ends of the piezoelectric ceramic sheet, electrode sheet and insulating gasket; high-temperature epoxy resin is evenly applied on 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; epoxy resin is evenly applied in the connecting threaded hole of the titanium alloy lower cover and on the titanium alloy center rod connected to the above-mentioned connecting threaded hole.

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

[0017] 1. The high-frequency, high-power, omnidirectional transducer with high thermal conductivity efficiency proposed in the present invention has horizontal omnidirectionality and, through a titanium alloy center rod with high thermal conductivity, conducts the heat generated by the crystal stack during operation to the water medium. At the same time, the insulating gasket isolates the voltage load from the water medium. The high-frequency sound source has horizontal omnidirectionality and high thermal conductivity, and the positive and negative poles of the sound source are not conductive to the water medium.

[0018] 2. The present invention controls the vertical directivity of the sound source through the finite element optimization design of the polyurethane rigid foam upper structure and the polyurethane rigid foam lower structure, which can further improve the high-frequency emission voltage response of the transducer. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 is a three-dimensional image of the titanium alloy lower cover;

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

[0022] exist Figure 1 Among them, number 1 is a titanium alloy center rod; number 2 is a titanium alloy upper cover; number 3 is a cylindrical radiation shell; number 4 is a titanium alloy lower cover; number 5 is a piezoelectric ceramic sheet; number 6 is an electrode sheet; number 7 is an insulating gasket; number 8 is a non-metallic center support; number 9 is an upper structural member; number 10 is a lower structural member; number 11 is a waterproof adhesive layer; number 12 is a pin; number 13 is a screw; number 14 is a boss; number 15 is a groove; number 16 is a wiring hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0024] like Figure 1 As shown, the high-frequency, high-power sound source with high thermal conductivity and large opening angle of the present invention includes: a titanium alloy center rod 1, a titanium alloy upper cover 2, a cylindrical radiation shell 3, a titanium alloy lower cover 4, a piezoelectric ceramic sheet 5, an electrode sheet 6, an insulating gasket 7, a non-metallic center support 8, an upper structure 9, a lower structure 10 and a waterproof adhesive layer 11. The titanium alloy center rod 1 is fixed at the center of the lower end of the titanium alloy lower cover 4, and the non-metallic center support 8 is mounted on the outside of the titanium alloy center rod 1. A boss 14 is provided at the upper end of the titanium alloy center rod 1, and a circular ring-shaped groove 15 is opened on the circumference of the boss 14. The titanium alloy upper 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 upper cover 2 and the upper end of the titanium alloy lower cover 4. Several groups of piezoelectric ceramic sheets 5 and electrode sheets 6 are installed in sequence on the outside of the non-metallic central support 8 between the two insulating gaskets 7. The piezoelectric ceramic sheets 5 and the electrode sheets 6 are installed alternately. The piezoelectric ceramic sheets 5, the electrode sheets 6 and the insulating gasket 7 are disc-shaped, and their diameters are the same. They are set on the outside of the non-metallic central support 8. The piezoelectric ceramic sheets 5 are in contact with the insulating gasket 7. The titanium alloy upper cover 2 and the titanium alloy lower cover 4 are disc-shaped, and their diameters are the same and larger than the diameter of the insulating gasket 7. A cylindrical radiation shell 3 is mounted on the outer circumference of a titanium alloy upper cover 2, a titanium alloy lower cover 4, two insulating gaskets 7 and a plurality of groups of piezoelectric ceramic sheets 5 and electrode sheets 6. The cylindrical radiation shell 3 is fixed to the titanium alloy upper cover 2 on the circumferential side close to the upper end of the cylindrical radiation shell 3 by a plurality of pins 12, and is fixed to the titanium alloy lower cover 4 on the circumference of the lower end of the cylindrical radiation shell 3 by a plurality of screws 13. An upper structural member 9 covers the upper end surfaces of the cylindrical radiation shell 3 and the upper end surfaces of the titanium alloy upper cover 2, and a lower structural member 10 covers the lower end surface of the titanium alloy lower cover 4. The lower structural member 10 is disc-shaped, and its diameter is greater 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 structure 9, and the waterproof adhesive layer 11 covers the outside of the cylindrical radiation shell 3, the outside of the lower structure 10 and the outside of the upper structure 9. The waterproof adhesive layer 11 covers the upper structure 9 and is flush with the upper end of the titanium alloy center rod 1. The upper structure 9 and the lower structure 10 are made of polyurethane rigid foam, the waterproof adhesive layer 11 is made of watertight polyurethane material, and the pins 12 and screws 13 are made of stainless steel.

[0025] The titanium alloy center rod 1 is fixed to the lower end of the titanium alloy lower cover 4 through a connecting threaded hole, and high-temperature epoxy resin is evenly applied to both ends of the piezoelectric ceramic sheet 5, the electrode sheet 6 and the insulating gasket 7. High-temperature epoxy resin is evenly applied to the lower end of the titanium alloy upper cover 2 and the upper end of the titanium alloy lower cover 4 in contact with the insulating gasket 7, and epoxy resin is evenly 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 the crystal pile composed of piezoelectric ceramic sheets 5, electrode sheets 6, and insulating gaskets 7 is driven, and the high-frequency and high-power sound source is developed through the vibration displacement amplification effect of the titanium alloy upper cover 2, the titanium alloy lower cover 4, and the cylindrical radiation shell 3. Due to the axial symmetry of the structure, the horizontal directivity of the sound source is theoretically omnidirectional. At the same time, since the center of the sound source is the titanium alloy center rod 1, it has a high thermal conductivity and can conduct the heat generated by the crystal pile during operation to the water medium. At the same time, since the insulating gasket 7 isolates the voltage load from the water medium, the sound source has high thermal conductivity and the positive and negative electrodes of the sound source are not conductive to the water medium. The details are as follows:

[0027] First, high-temperature epoxy resin is evenly applied to both ends of the piezoelectric ceramic sheet 5, the electrode sheet 6, and the insulating gasket 7. Epoxy resin is also evenly applied to the contact between the titanium alloy upper cover 2, the titanium alloy lower cover 4 and the insulating gasket 7, the titanium alloy center rod 1 and the titanium alloy upper cover 2, and the connection thread between the titanium alloy center rod 1 and the titanium alloy lower cover 4. The piezoelectric ceramic sheet 5, the electrode sheet 6, the insulating gasket 7, the non-metallic center support 8, the titanium alloy upper cover 2, and the titanium alloy lower cover 4 are assembled through the titanium alloy center rod 1. Figure 1 The driving crystal pile shown, the non-metallic center support 8 improves the insulation of the crystal pile and the coaxiality of the piezoelectric ceramic sheet 5 and other structures. When tightening the connection thread of the titanium alloy center rod 1 and the titanium alloy lower cover 4, a fixed value of torque is applied by a torque wrench to ensure the consistency of the transducer prestress. There are insulating gaskets 7 on both sides of the crystal pile of the sound source, which can isolate the voltage load from the water medium. At the same time, when designing the mold, the upper side of the titanium alloy center rod 1 of the transducer is in direct contact with the water medium, ensuring the high thermal conductivity of the transducer.

[0028] Secondly, after the epoxy resin inside the driven crystal pile is cured, the epoxy resin is applied to the contact between the titanium alloy upper cover 2 and the cylindrical radiation shell 3, and the titanium alloy lower cover 4 and the cylindrical radiation shell 3, and the titanium alloy upper cover 2 and the cylindrical radiation shell 3 are fixed by pins 12, and then the titanium alloy lower cover 4 and the cylindrical radiation shell 3 are connected by stainless steel screws 13 to form a cylindrical vibration structure. In particular, in order to reduce the processing cost of the cylindrical radiation shell 3, the cylindrical radiation shell 3 is optimized and designed by finite element calculation, and the cylindrical radiation shell 3 is designed as a structure with an outer cylindrical shape and an inner spherical surface, which reduces the processing cost while having a good vibration displacement amplification effect.

[0029] Furthermore, the dimensions of the upper structure 9 and the lower structure 10 of the polyurethane rigid foam are optimized by finite element simulation to improve the electroacoustic performance of the transducer. The upper structure 9 and the lower structure 10 of the polyurethane rigid foam after the optimized design are bonded to the upper and lower sides of the transducer by means of fast curing glue to complete the assembly of the transducer. Two wiring holes 16 (such as Figure 2 As shown), the positive and negative electrodes of the piezoelectric ceramic sheet 5 are connected in parallel and then led out through the wiring hole 16, and the wiring hole 16 is blocked with fast-curing glue, and then placed in the transducer casting mold to complete the casting.

[0030] like Figure 1 As shown in the figure, a high-frequency, high-power omnidirectional transducer with high thermal conductivity is cast. The transmission voltage response level curve of the transducer is as follows Figure 3 As shown, the horizontal axis is frequency normalization. Through the finite element structural parameter design and the directivity control of the upper structural member 9 of the polyurethane rigid foam and the lower structural member 10 of the polyurethane rigid foam, the sound source is omnidirectional in the horizontal direction within the working frequency range and has a good high-frequency emission voltage response.

[0031] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numerals in the claims should not be considered as limiting the rights involved.

Claims

1. A high-frequency, high-power sound source with high thermal conductivity and large opening angle, comprising: A titanium alloy central rod (1), a titanium alloy upper cover (2), a cylindrical radiation shell (3), a titanium alloy lower cover (4), a piezoelectric ceramic sheet (5), an electrode sheet (6), an insulating gasket (7), a non-metallic central support member (8), an upper structural member (9), a lower structural member (10) and a waterproof adhesive layer (11), characterized in that: the titanium alloy central rod (1) is fixed at the center of the lower end of the titanium alloy lower cover (4), the non-metallic central support member (8) is sleeved on the outer side of the titanium alloy central rod (1), the titanium alloy upper cover (2) is fixed at the upper end of the non-metallic central support member (8), an insulating gasket (7) is respectively installed at the lower end of the titanium alloy upper cover (2) and the upper end of the titanium alloy lower cover (4), and a plurality of groups of piezoelectric ceramic sheets (5) and electrode sheets (6) are sequentially installed on the outer side of the non-metallic central support member (8) between the two insulating gaskets (7), the piezoelectric ceramic sheets (5) and the electrode sheets (6) are respectively installed alternately, the piezoelectric ceramic sheets (5) are in contact with the insulating gasket (7), and the titanium alloy A cylindrical radiation shell (3) is mounted on the outer circumference of an upper cover (2), a titanium alloy lower cover (4), two insulating gaskets (7) and a plurality of groups of piezoelectric ceramic sheets (5) and electrode sheets (6). The cylindrical radiation shell (3) is fixed to the titanium alloy upper cover (2) by a plurality of pins (12) on the circumference side close to the upper end of the cylindrical radiation shell (3), and is fixed to the titanium alloy lower cover (4) by a plurality of screws (13) on the circumference of the lower end of the cylindrical radiation shell (3). The upper structural member (9) covers The cover is on the upper end surface of the cylindrical radiation shell (3) and the upper end surface of the titanium alloy upper cover (2); the lower structure (10) covers the lower end surface 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 structure (9); the waterproof adhesive layer (11) covers the outer side of the cylindrical radiation shell (3), the outer side of the lower structure (10) and the outer side of the upper structure (9); the waterproof adhesive layer (11) covers the upper part of the upper structure (9) and is flush with the upper end of the titanium alloy center rod (1).

2. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as claimed in claim 1, characterized in that: The upper end of the titanium alloy center rod (1) is provided with a boss (14), the titanium alloy upper cover (2) is fixed on the lower end of the boss (14), and 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 claimed in claim 2, characterized in that: The piezoelectric ceramic sheet (5), electrode sheet (6) and insulating gasket (7) are in the shape of discs with the same diameter, and are sleeved on the outside of a non-metallic central support member (8).

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

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

6. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as claimed in claim 5, characterized in that: The upper structural member (9) and the lower structural member (10) are made of polyurethane rigid foam.

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

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

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

10. The high-frequency, high-power sound source with high thermal conductivity and large opening angle as claimed in claim 9, characterized in that: High-temperature epoxy resin is evenly applied to both ends of the piezoelectric ceramic sheet (5), the electrode sheet (6) and the insulating gasket (7); high-temperature epoxy resin is evenly applied to the lower end of the titanium alloy upper cover (2) in contact with the insulating gasket (7) and the upper end of the titanium alloy lower cover (4); and epoxy resin is evenly applied to the connection threaded hole of the titanium alloy lower cover (4) and the titanium alloy center rod (1) connected to the above-mentioned connection threaded hole.

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