A broadband medium and low frequency composite transmitting transducer for deep sea

Abstract

The present invention belongs to the technical field of underwater acoustic transducers, and discloses a broadband medium-low frequency composite transmitting transducer for deep sea, including: a low-frequency transmitting transducer, a medium-frequency transmitting transducer, a water-permeable shell and a cable; the low-frequency transmitting transducer is connected to the base, and is used to radiate low-frequency sound waves into the water medium; the medium-frequency transmitting transducer is connected to the base, and is used to radiate medium-frequency sound waves into the water medium; the water-permeable shell is connected to the base, and is used to achieve the internal and external pressure balance of the composite transmitting transducer. The present invention has a simple structure, small size, and low manufacturing cost, and can economically and conveniently form a broadband medium-low frequency sound source that can be used in the deep sea. The present invention combines a low-frequency transmitting transducer and a medium-frequency transmitting transducer to form a broadband composite transmitting transducer, which not only reduces the overall size, but also realizes the wide use requirement that one transmitting transducer can transmit two types of sound signals.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater acoustic transducers, and in particular relates to a broadband medium- and low-frequency composite transmitting transducer used in the deep sea. Background Art

[0002] Because sound waves are an effective carrier of underwater information, various types of hydroacoustic equipment are needed in the fields of detecting seabed topography, hydroacoustic positioning, and hydroacoustic communications. In particular, as the national marine strategy develops towards the deep sea, offshore, and ocean, broadband, medium- and low-frequency sound wave transmitting transducers that can be used in deep-sea environments are becoming a research hotspot in the field of hydroacoustic engineering.

[0003] Generally, the lower the working frequency and the deeper the working depth of the transducer, the more difficult it is to design and manufacture. Common structural types of deep-sea low-frequency transmitting transducers include Helmholtz resonant cavity type, overflow liquid cavity type, overflow flextension type, and electric type. Due to the low frequency and long wavelength, the size and weight of the low-frequency transmitting transducer are large, which limits the scope of use of its carrying platform.

[0004] At present, the design of high hydrostatic pressure resistance of underwater acoustic transducers at home and abroad is generally achieved by special pressure-resistant structures or internal and external pressure balance. Special pressure-resistant structures are mostly made of titanium alloy materials with high yield strength. Due to the pressure-bearing limitations of the pressure-resistant shell and its auxiliary materials, this method has certain depth limitations. The general working depth is within 1000m, and the processing is difficult and the cost is high.

[0005] Common ways to balance internal and external pressures include pneumatic pressure compensation, oil filling and overflow structure. In theory, the working depth of the transducer with internal and external pressure balance can reach the full sea depth. The difference between them is that the overflow structure is open and directly connected to the outside water. Pneumatic pressure compensation and oil filling structures are closed, and the internal and external pressure balance is achieved by inflating air bags or filling oil. Although the overflow transducer has good deep-water stability and good broadband effect, the corresponding size and weight are large. The oil filling method has the problem of large loss and reduced acoustic performance for transducers with higher frequencies.

[0006] Through the above analysis, the problems and defects of the prior art are as follows:

[0007] (1) Common deep-sea low-frequency transmitting transducers are large in size, heavy in weight, and have a narrow operating frequency band;

[0008] (2) The pressure-resistant structure made of titanium alloy is difficult to process, the cost is high, and the working depth is limited;

[0009] (3) The overflow-type low-frequency transmitting transducer is large in size and weight, and has a narrow frequency band;

[0010] (4) The oil-filled structure causes large losses in the mid- and high-frequency transducers and reduces the acoustic performance. Summary of the invention

[0011] In view of the problems existing in the prior art, the present invention provides a broadband medium-low frequency (20 Hz to 20 kHz) composite transmitting transducer for deep sea.

[0012] The present invention is implemented as follows: a broadband medium-low frequency composite transmitting transducer for deep sea, comprising:

[0013] Low frequency transmitting transducer, medium frequency transmitting transducer, water-permeable housing and cable;

[0014] The low-frequency transmitting transducer is connected to the base and is used for radiating low-frequency sound waves into the water medium;

[0015] The intermediate frequency transmitting transducer is connected to the base and is used for radiating intermediate frequency sound waves into the water medium;

[0016] The water-permeable shell is connected to the base and is used to achieve internal and external pressure balance of the composite transmitting transducer.

[0017] Furthermore, the low-frequency transmitting transducer includes a dynamic vibrator, a radiation panel, a switching pressure plate, a central sealing cover, a sealing ring, a flexible silicone plate, a switching base plate, an airbag mounting plate, an airbag and a low-frequency signal line.

[0018] Furthermore, the moving coil vibrator is fixedly connected to the base via the adapter base plate, and is used to convert the low-frequency conditioned electrical signal transmitted by the low-frequency signal line into a mechanical vibration signal;

[0019] The radiation panel is connected to the dynamic coil vibrator through screws, and is used to convert the mechanical vibration signal generated by the dynamic coil vibrator into an acoustic radiation signal, and radiate low-frequency sound waves into the water medium.

[0020] Furthermore, the airbag is fixedly connected to the base through the airbag fixing plate and the adapter bottom plate, so as to achieve pressure balance inside and outside the composite transmitting transducer;

[0021] The intermediate frequency transmitting transducer comprises an inlaid ring oscillator, a polyurethane shell, an embedded fixing plate and an intermediate frequency signal line.

[0022] Furthermore, the base is used to install the inlaid ring vibrator, to connect the dynamic vibrator, and to connect the water-permeable shell, thereby forming a composite transducer as a whole;

[0023] The inlaid ring oscillator is positioned with a base, and is used to convert the intermediate frequency conditioned electrical signal transmitted from the intermediate frequency signal line into an acoustic radiation signal through the inverse piezoelectric effect, and radiate intermediate frequency sound waves into the water medium.

[0024] Further, the polyurethane shell is used to fix the inlaid ring vibrator on the base and form a sound-transmitting shell of the intermediate frequency transmitting transducer, and is also used to position the embedded fixing plate on the upper end of the polyurethane shell of the intermediate frequency transmitting transducer;

[0025] The embedded fixing plate is positioned at the same height as the radiation panel of the low-frequency transmitting transducer through the polyurethane shell, and is used to connect the radiation panel of the low-frequency transmitting transducer through the flexible silicone plate.

[0026] Furthermore, the water-permeable shell is a cylindrical hollow shell, and water enters through the water-permeable holes on the shell to achieve pressure balance inside and outside the composite transmitting transducer;

[0027] The cable is used to transmit the medium and low frequency conditioned electrical signals required by the composite transmitting transducer to transmit the acoustic signal.

[0028] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0029] First, this invention describes an innovative broadband medium-low frequency composite transmitting transducer, whose significant technological advances are reflected in the manufacturing process and working principle. During the manufacturing process, an integrated shell is formed by hot casting of polyurethane to ensure the watertightness and structural integrity of the device. At the same time, a combination of a moving coil vibrator and an inlaid ring oscillator is used to achieve broadband frequency coverage from low frequency to medium frequency. This design not only improves the applicability and flexibility of deep-sea acoustic wave transmission, but also significantly enhances the efficiency and effectiveness of acoustic wave transmission. In addition, the watertight treatment of the cable interface and the fixed design of the permeable shell and the base make the transducer more suitable for deep-sea environments. These technological advances have jointly promoted the development of deep-sea acoustic wave communications, detection and research, and provided new and powerful tools for deep-sea exploration.

[0030] 1. It has a simple structure, small dimensions, and low cost. It can economically and conveniently form a broadband low-frequency sound source that can be used in the deep sea.

[0031] 2. The low-frequency transmitting transducer and the medium-frequency transmitting transducer are combined to form a broadband composite transmitting transducer, which not only reduces the overall size, but also realizes the broadband use requirement that one transmitting transducer can transmit two types of sound signals.

[0032] 3. The integrated closed inner cavity formed by the airbag, polyurethane shell and radiation panel realizes the pneumatic internal and external pressure balance of the two medium and low frequency transmitting transducers.

[0033] One device of the present invention can realize the emission of broadband medium and low frequency sound signals of 20Hz-20kHz, and can be used in deep sea environment. It has simple structure, small size, low manufacturing cost and convenient use.

[0034] Second, the expected benefits and commercial value after the transformation of the technical solution of the present invention are as follows: the present invention is applicable to various detection, communication and target acoustic characteristic simulation systems that need to transmit broadband acoustic signals in deep-sea environments, and can also be widely used on autonomous unmanned underwater vehicle (such as UUV) platforms to achieve underwater environment perception, underwater target detection, underwater acoustic communication and many other fields, and it is low-cost, easy to use, easy to promote, and has high commercial value.

[0035] The technical solution of the present invention fills the technical gap in the industry at home and abroad: the present invention adopts a composite working mode of low-frequency electric and medium-frequency piezoelectric to meet the requirement of broadband operation of the transmitting transducer. At the same time, a pneumatic pressure balance cabin is used for the first time to solve the problem of pressure balance of two types of transducers.

[0036] The technical solution of the present invention solves a technical problem that people have been eager to solve but have never succeeded in solving: the present invention solves the problem that traditional deep-sea sound sources have narrow signal bands, large dimensions, and heavy weight and cannot be used conveniently.

[0037] The technical solution of the present invention overcomes technical prejudice: it makes full use of components such as airbags, polyurethane shells and radiation panels to form an integrated closed inner cavity, which not only meets the internal and external pressure balance conditions required for working in deep-sea environments, but also greatly reduces the external dimensions of the transducer. At the same time, the two types of medium and low frequency transmitting transducers are combined into one through the base, further broadening the working frequency band of the transducer and ensuring the wide application range of the transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 1 is a schematic diagram of the structure of a broadband medium- and low-frequency composite transmitting transducer for deep sea use provided by an embodiment of the present invention;

[0040] Figure 2 It is a schematic diagram of the position of a watertight cable head on a base provided by an embodiment of the present invention;

[0041] Figure 3 It is a schematic diagram of signal line distribution in a watertight cable head provided by an embodiment of the present invention;

[0042] In the figure: 1. low-frequency transmitting transducer; 10. dynamic vibrator; 11. radiation panel; 12. sealing ring; 13. adapter pressure plate; 14. center sealing cover; 15. flexible silicone plate; 16. adapter base plate; 17. airbag fixing plate; 18. airbag; 19. low-frequency signal line; 2. intermediate-frequency transmitting transducer; 21. base; 22. inlaid ring oscillator; 23. polyurethane shell; 24. embedded fixing plate; 25. intermediate-frequency signal line; 26. watertight cable head; 3. permeable shell; 4. cable. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] In view of the problems existing in the prior art, the present invention provides a broadband medium and low frequency composite transmitting transducer for deep sea use. The present invention is described in detail below in conjunction with the accompanying drawings.

[0045] Based on the design and working principle of the broadband medium and low frequency composite transmitting transducer provided by the present invention, the following are two specific embodiments, which demonstrate the use method and effect of the transmitting transducer in different application scenarios.

[0046] Example 1: Deep sea geological exploration

[0047] In deep-sea geological exploration, broadband medium- and low-frequency composite transmitting transducers are used to conduct acoustic detection of underground structures to identify oil, natural gas or mineral resources.

[0048] 1. Preparation stage: Install the composite transmitting transducer on a deep-sea exploration ship or submersible and connect it to the control system via cables.

[0049] 2. Emitting sound waves: Through the control system, a conditioning electrical signal of a specific frequency is input to the moving coil vibrator 10 and the mosaic ring vibrator 22 respectively, generating low-frequency and medium-frequency sound waves. These sound waves can penetrate the seabed and enter deep underground.

[0050] 3. Data collection: Using an array of acoustic receivers placed on the seafloor, the acoustic signals reflected by underground structures are captured.

[0051] 4. Data analysis: Analyze the collected sound wave data and infer the geological structure and resource distribution under the seabed based on the reflection characteristics of the sound waves.

[0052] The use of broadband medium and low frequency composite transmitting transducers can provide a wider frequency range and better sound wave penetration capability, which significantly improves the accuracy and efficiency of deep-sea geological exploration.

[0053] Example 2: Deep-sea biological community survey

[0054] In deep-sea biological community surveys, broadband medium- and low-frequency composite transmitting transducers are used to emit sound waves to detect and monitor biological activities in the deep sea, such as the movement of fish schools.

[0055] 1. Equipment configuration: Install the composite transmitting transducer on an ocean research vessel or unmanned submersible and ensure that the cable connection is normal.

[0056] 2. Sound wave emission: According to the type of organisms to be monitored and the characteristics of their activities, a suitable frequency is selected, and the emission frequencies of the moving coil vibrator 10 and the inlaid ring vibrator 22 are adjusted through the control system to emit sound waves into the sea.

[0057] 3. Biological response monitoring: Use sonar systems to receive sound wave signals reflected by deep-sea biological communities or individuals to monitor their location, density and movement.

[0058] 4. Behavioral analysis: Analyze the received data to study the behavioral patterns, community structure and ecological environment changes of deep-sea organisms.

[0059] By emitting sound waves at different frequencies, the broadband medium and low frequency composite transmitting transducer can effectively detect and monitor the distribution and activities of deep-sea organisms, providing a powerful tool for deep-sea ecological research.

[0060] These two examples demonstrate the application potential of broadband medium- and low-frequency composite transmitting transducers in deep-sea exploration and ecological monitoring. With its wide bandwidth and high performance, it can meet the diverse needs of deep-sea exploration. Figure 1 As shown, a broadband medium- and low-frequency composite transmitting transducer that can be used in the deep sea provided by an embodiment of the present invention comprises a low-frequency transmitting transducer 1, a medium-frequency transmitting transducer 2, a water-permeable housing 3 and a cable 4.

[0061] The following further describes the dynamic structural relationship of the wide, medium and low frequency composite transmitting transducer that can be used in the deep sea through embodiments:

[0062] Signal transmission and control are carried out between the components of the entire composite transmitting transducer through cables.

[0063] As one of the cores of the composite transmitting transducer, the low-frequency transmitting transducer performs the function of converting electrical signals into acoustic signals, that is, converting the low-frequency conditioned electrical signal transmitted by the cable into mechanical energy to radiate a low-frequency acoustic signal of 20Hz to 3kHz into the water medium.

[0064] As another core of the composite transmitting transducer, the intermediate frequency transmitting transducer also performs the function of converting electrical signals into acoustic signals, that is, converting the intermediate frequency conditioned electrical signal transmitted by the cable into mechanical energy to radiate 4-20kHz intermediate frequency acoustic signals into the water medium.

[0065] The water-permeable shell is responsible for balancing the internal and external pressures of the composite transmitting transducer to meet the requirements of the deep-sea working environment.

[0066] Therefore, the dynamic structural relationship of the present invention lies in transmitting preset conditioned electrical signals of different frequency bands through the corresponding ports of the cable, respectively utilizing low-frequency transmitting transducers and medium-frequency transmitting transducers to realize the transmission of broadband acoustic signals, and realizing the requirements of the deep-sea working environment of the composite transmitting transducer through a permeable shell.

[0067] When the present invention is applied, first refer to Figure 1 , the inlaid ring vibrator 22 is installed and fixed on the base 21.

[0068] Then, refer to Figure 2 Four sufficiently long signal lines are passed through the watertight cable head 26 of the base 21 and are numbered "1", "2", "3" and "4".

[0069] Reference Figure 3 , the signal lines numbered “3” and “4” are respectively connected to the positive and negative electrodes of the inlaid ring oscillator 22 to form the intermediate frequency signal line 25.

[0070] Then, after cleaning the installed inlaid ring vibrator 22, the base 21 and the intermediate frequency signal line 25, a potting mold is respectively placed on the outside of the base 21 and the watertight cable head 26.

[0071] Then, the embedded fixing plate 24 is positioned and installed on the upper end of the potting mold of the base 21. The base 21, the inlaid ring vibrator 22, and the embedded fixing plate 24 are connected into one by polyurethane hot casting to form a polyurethane shell 23. At the same time, the four signal lines are also sealed inside the polyurethane shell 23, and a watertight cable head 26 is formed on the base 21.

[0072] Then, the moving coil exciter 10 is passed through the central hole of the base 21 and placed into the polyurethane housing 23 , and the moving coil exciter 10 is fixed to the base 21 by screws and the adapter base plate 16 .

[0073] Then, refer to Figure 3 , the signal lines numbered “1” and “2” are respectively connected to the positive and negative electrodes of the moving coil exciter 10 to form a low-frequency signal line 19.

[0074] Then, the radiation panel 11 is fixed to the moving coil vibrator 10 by means of screws through the central connection hole, and then the sealing ring 12 and the central sealing cover 14 are installed to seal the radiation panel.

[0075] Then, the flexible silicone plate 15 is fixed to the outer surface of the radiation panel 11 and the embedded fixing plate 24 through the adapter pressing plate 13 by means of screws, thereby completing the installation of the composite transmitting transducer head.

[0076] Then, the airbag 18 is fixed to the adapter base plate 16 through the airbag fixing plate 17 and fixed to the base 21 to complete the installation of the rear part of the composite transmitting transducer.

[0077] Then, the low-frequency signal line 19 and the intermediate-frequency signal line 25 at the watertight cable head 26 are connected to the corresponding four-core twisted-pair shielded cable 4 through the cable port of the water-permeable shell 3, and the cable interface is made watertight at the interface using a polyurethane casting mold.

[0078] Then, the water-permeable housing 3 with the cable 4 is fixed to the base 21 by screws to form a broadband medium- and low-frequency composite transmitting transducer that can be used in the deep sea.

[0079] Finally, a low-frequency conditioning electrical signal is input through the signal lines numbered "1" and "2" on the cable 4 to realize low-frequency sound wave emission. An intermediate-frequency conditioning electrical signal is input through the signal lines numbered "3" and "4" on the cable 4 to realize intermediate-frequency sound wave emission.

[0080] The signal line is connected to the inlaid ring oscillator: the signal lines numbered “3” and “4” are respectively connected to the positive and negative electrodes of the inlaid ring oscillator 22 to form the intermediate frequency signal line 25 .

[0081] Component cleaning and potting: After the installed inlaid ring vibrator 22, base 21 and intermediate frequency signal line 25 are cleaned, the outside of the base 21 and the watertight cable head 26 are covered with a potting mold.

[0082] Formation of polyurethane shell: The embedded fixing plate 24 is positioned and installed on the upper end of the potting mold of the base 21. The base 21, the inlaid ring vibrator 22, and the embedded fixing plate 24 are connected into one body by polyurethane hot casting to form the polyurethane shell 23.

[0083] Moving coil exciter installation: The moving coil exciter 10 is inserted into the polyurethane housing 23 through the central hole of the base 21, and the moving coil exciter 10 is fixed to the base 21 by screws and the adapter base plate 16.

[0084] Installation of radiation panel and sealing assembly: The radiation panel 11 is fixed to the moving coil vibrator 10 by screws, and the sealing ring 12 and the center sealing cover 14 are installed to achieve the sealing of the radiation panel.

[0085] The head and tail of the composite transmitting transducer are installed: the flexible silicone plate 15 is fixed to the outer surface of the radiation panel 11 and the embedded fixing plate 24 by screws. The airbag 18 is fixed to the adapter bottom plate 16 through the airbag fixing plate 17 and fixed to the base 21.

[0086] Watertight treatment of the cable interface: The low-frequency signal line 19 and the intermediate-frequency signal line 25 at the watertight cable head 26 are connected to the corresponding four-core twisted-pair shielded cable 4 through the cable port of the permeable shell 3, and polyurethane completes the watertightness of the cable interface at the interface.

[0087] Device fixing: The water-permeable housing 3 with the cable 4 is fixed to the base 21 by screws to form a broadband medium and low frequency composite transmitting transducer that can be used in the deep sea.

[0088] Low-frequency sound wave emission: A low-frequency conditioned electrical signal is input to the moving coil vibrator 10 through the signal lines numbered "1" and "2" on the cable 4 to generate a low-frequency sound wave.

[0089] Intermediate frequency sound wave emission: Through the signal lines numbered "3" and "4" on the cable 4, the intermediate frequency conditioning electrical signal is input to the inlaid ring oscillator 22 to generate intermediate frequency sound waves.

[0090] With this design, the composite transmitting transducer can effectively transmit low-frequency and medium-frequency sound waves in deep-sea environments, and is suitable for various deep-sea detection and communication applications.

[0091] Combined with the application embodiments, the present invention has the following advantages compared with the prior art:

[0092] (1) The composite transmitting transducer cavity is formed by making full use of the airbag, polyurethane shell, radiation panel and other structural components, which not only achieves internal and external pressure balance but also reduces the external dimensions;

[0093] (2) One set of equipment achieves broadband transmission of medium and low frequency sound waves, eliminating the need to select multiple devices with different frequency bands.

[0094] Combined with the application embodiments, the present invention has the following advantages compared with the prior art:

[0095] (1) The electric low-frequency sound source and the piezoelectric intermediate-frequency sound source are combined into one through the base, effectively meeting the need for broadband transmission of the transmitting transducer.

[0096] (2) The integrated closed inner cavity formed by the airbag, polyurethane shell and radiation panel provides pneumatic internal and external pressure balance for the two transmitting transducers, meeting the needs of deep-sea work.

[0097] (3) The integrated structural design of the two transmitting transducers effectively reduces the size and weight of the transducers, achieving the needs of light and fast use.

[0098] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0099] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A broadband medium and low frequency composite transmitting transducer for deep sea, characterized in that: include: Low frequency transmitting transducer, medium frequency transmitting transducer, water-permeable housing and cable; The low-frequency transmitting transducer is connected to the base and is used for radiating low-frequency sound waves into the water medium; The intermediate frequency transmitting transducer is connected to the base and is used for radiating intermediate frequency sound waves into the water medium; The water-permeable housing is connected to the base to achieve pressure balance inside and outside the composite transmitting transducer; When used, firstly, the inlaid ring vibrator (22) is installed and fixed on the base (21); Then, four signal lines of sufficient length are passed through the watertight cable head (26) of the base (21) and are numbered "1", "2", "3", and "4"; The signal lines numbered "3" and "4" are respectively connected to the positive electrode and the negative electrode of the inlaid ring oscillator (22) to form an intermediate frequency signal line (25); Then, after cleaning the installed inlaid ring vibrator (22), the base (21) and the intermediate frequency signal line (25), a potting mold is respectively placed on the outside of the base (21) and the watertight cable head (26); Then, the embedded fixing plate (24) is positioned and installed on the upper end of the potting mold of the base (21); the base (21), the inlaid ring vibrator (22), and the embedded fixing plate (24) are connected into one body by polyurethane hot casting to form a polyurethane shell (23), and at the same time, the four signal lines are also sealed inside the polyurethane shell (23), and a watertight cable head (26) is formed on the base (21); Then, the moving coil vibrator (10) is inserted into the polyurethane housing (23) through the central hole of the base (21), and the moving coil vibrator (10) is fixed to the base (21) by screws and the adapter base plate (16); Then, the signal lines numbered "1" and "2" are connected to the positive electrode and the negative electrode of the moving coil vibrator (10) respectively to form a low-frequency signal line (19); Then, the radiation panel (11) is fixed to the moving coil vibrator (10) by screws through the central connection hole, and then the sealing ring (12) and the central sealing cover (14) are installed to achieve sealing of the radiation panel; Then, the flexible silicone plate (15) is fixed to the outer surface of the radiation panel (11) and the embedded fixing plate (24) by screws through the adapter pressure plate (13), thereby completing the installation of the composite transmitting transducer head; Then, the airbag (18) is fixed to the adapter base plate (16) through the airbag fixing plate (17), and fixed to the base (21), thereby completing the installation of the tail of the composite transmitting transducer; Then, the low-frequency signal line (19) and the intermediate-frequency signal line (25) at the watertight cable head (26) are connected to the corresponding four-core twisted-pair shielded cable (4) through the cable port of the water-permeable housing (3), and the cable interface is made watertight at the interface by using a polyurethane potting mold; Then, the water-permeable housing (3) with the cable (4) is fixed to the base (21) by screws to form a broadband medium- and low-frequency composite transmitting transducer that can be used in the deep sea; Finally, a low-frequency conditioning electrical signal is input through the signal lines numbered "1" and "2" on the cable (4) to achieve low-frequency sound wave emission; an intermediate-frequency conditioning electrical signal is input through the signal lines numbered "3" and "4" on the cable (4) to achieve intermediate-frequency sound wave emission; The low-frequency transmitting transducer includes a dynamic vibrator, a radiation panel, a transfer pressure plate, a central sealing cover, a sealing ring, a flexible silicone plate, a transfer bottom plate, an airbag mounting plate, an airbag and a low-frequency signal line; The intermediate frequency transmitting transducer includes an inlaid ring vibrator, a polyurethane shell, an embedded fixing plate and an intermediate frequency signal line; The dynamic coil exciter is fixedly connected to the base through the adapter base plate, and is used to convert the low-frequency conditioned electrical signal transmitted by the low-frequency signal line into a mechanical vibration signal; The radiation panel is connected to the dynamic coil exciter through screws, and is used to convert the mechanical vibration signal generated by the dynamic coil exciter into an acoustic radiation signal, and radiate low-frequency sound waves into the water medium; The airbag is fixedly connected to the base through the airbag fixing plate and the adapter bottom plate, and is used to achieve the internal and external pressure balance of the composite transmitting transducer; The base is used to install the inlaid ring vibrator, to connect the dynamic vibrator, and to connect the water-permeable shell, so as to form a composite transmitting transducer as a whole; The inlaid ring vibrator is positioned by a base, and is used to convert the intermediate frequency conditioned electrical signal transmitted from the intermediate frequency signal line into an acoustic radiation signal through the inverse piezoelectric effect, and radiate the intermediate frequency sound wave into the water medium; The polyurethane shell is used to fix the inlaid ring vibrator on the base and form a sound-transmitting shell of the intermediate frequency transmitting transducer, and is also used to position the embedded fixing plate on the upper end of the polyurethane shell of the intermediate frequency transmitting transducer; The embedded fixing plate is positioned at the same height as the radiation panel of the low-frequency transmitting transducer through the polyurethane shell, and is used to connect the radiation panel of the low-frequency transmitting transducer through the flexible silicone plate; The water-permeable shell is a cylindrical hollow shell, and water enters through the water-permeable holes on the shell to achieve pressure balance inside and outside the composite transmitting transducer; Signal transmission and control are carried out between the components of the entire composite transmitting transducer through cables.

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