Fishbone-shaped electrode discharge underwater sound generating device for adjusting frequency

Abstract

The invention discloses a fishbone-shaped electrode discharge underwater sound generating device for adjusting frequency. The fishbone-shaped electrode discharge underwater sound generating device comprises a fixed supporting shell, a voltage-resistant insulating box body and a cable, wherein the voltage-resistant insulating box body and the cable are fixed on the fixed supporting shell; one end of the cable is fixed with the voltage-withstanding insulation box body, and the other end of the cable is used as a high-voltage input end of direct-current high voltage; the two sides of the cable are respectively and fixedly provided with a group of line electrode parallel sequences which are arranged in parallel. The voltage-withstanding insulation box body is rotatably connected with one end of each of the two metal adjusting rods, so that the two metal adjusting rods are arranged on the two sides of the cable in a V shape; the two metal adjusting rods are connected with the line electrodes on the line electrode parallel sequence through slidable lock catches; direct-current high-voltage electricity is input through a cable, underwater discharging is completed through a parallel sequence of the two sets of line electrodes, sound pulses are achieved, then backflow of pulse current is completed through a metal adjusting rod, and finally a discharging loop is formed. According to the invention, the desired frequency can be adjusted according to the discharge intensity so as to generate water sound.

Description

A fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment Technical Field

[0001] This invention belongs to the field of marine seismic exploration, and in particular relates to a fishbone-shaped electrode discharge underwater acoustic generator for adjusting frequency. Background Technology

[0002] In recent years, maritime shipping and seabed mining activities have become increasingly frequent, leading to increasingly serious marine background noise. Moreover, with the improvement of underwater target noise reduction levels, their radiated noise levels are now lower than marine background noise, which has brought great difficulties to underwater target detection.

[0003] Underwater acoustic signals are sound waves that propagate in water. They can originate from sound sources (such as sonar, ship engines, biological sounds, etc.) or sound waves related to the water medium itself (such as sound waves caused by underwater topography, underwater objects, etc.). Filtering, noise reduction, and enhancement of the received underwater acoustic signals to improve signal quality and readability are challenges that need to be overcome.

[0004] Underwater acoustic sensors have important applications in military and civilian fields such as underwater target detection, oil and gas exploration, and seismic detection. Currently, most underwater discharge-type acoustic generators use a fixed electrode structure, and the electrode spacing and discharge circuit parameters cannot be flexibly adjusted. This results in the device only being able to output acoustic pulses of a single frequency, making it difficult to adapt to the acoustic signal requirements of different detection depths and targets in complex marine environments.

[0005] Chinese patent document CN115327612A discloses a linear multi-stage series arc discharge underwater acoustic generator, including a supporting and fixing device and multiple sets of line electrodes arranged in series parallel on the supporting and fixing device. Each set of line electrodes includes multiple line electrodes arranged at equal intervals along a straight line, and each line electrode includes a central metal conductor and an outer insulating layer. The two ends of the multiple sets of line electrodes are respectively connected to a high-voltage end and a low-voltage end. The high-voltage end is connected to the high-voltage section of a pulse cable to realize high-voltage electrical pulse input. The low-voltage end is connected to the low-voltage section of the pulse cable to form the low-voltage section of the discharge circuit, realizing the conduction of the entire discharge circuit. Using this device, the electroacoustic efficiency can be further improved, making the transmitting device stable and reliable, and extending the electrode life.

[0006] However, the aforementioned underwater acoustic generator uses a single-electrode opposing discharge structure, which can achieve underwater acoustic pulse emission, but the electrode position is fixed and the discharge intensity and frequency are not adjustable. When facing complex ocean background noise, the sound signal has insufficient recognition and penetration.

[0007] Furthermore, the existing adjustable underwater acoustic generators have complex adjustment structures, which are prone to problems such as sealing failure and adjustment jamming in the high-pressure environment of the deep sea. Additionally, the uneven impedance changes in the discharge circuit during adjustment result in low frequency adjustment accuracy and poor acoustic pulse stability. At the same time, traditional electrode materials have insufficient resistance to ablation, and long-term discharge easily causes electrode wear, further reducing the lifespan and operational reliability of the device.

[0008] In summary, existing underwater discharge acoustic generators generally suffer from problems such as lack of frequency adjustment capability or low precision, poor adaptability to deep-sea environments, and easy electrode wear, and can no longer meet the high-precision, multi-scenario operation requirements of fields such as marine seismic exploration. Summary of the Invention

[0009] This invention provides a fishbone-shaped electrode discharge underwater sound generator for frequency adjustment, which can effectively adjust the intensity of the discharge to generate underwater sound by adjusting the desired frequency.

[0010] A fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment includes a fixed support shell, a pressure-resistant insulating box and a cable fixed on the fixed support shell; one end of the cable is fixed to the pressure-resistant insulating box, and the other end serves as the high-voltage input terminal for DC high voltage; a set of parallel-arranged line electrodes are fixed on both sides of the cable; the pressure-resistant insulating box is rotatably connected to one end of two metal adjusting rods, so that the two metal adjusting rods are arranged in a V-shape on both sides of the cable; the two metal adjusting rods are connected to the line electrodes on the parallel-arranged line electrodes through sliding latches; DC high voltage is input through the cable, the two sets of parallel-arranged line electrodes complete underwater discharge to realize acoustic pulses, and then the pulse current is returned through the metal adjusting rods to finally form a discharge circuit.

[0011] The parallel sequence of line electrodes is connected to the cable and the metal regulating rod respectively. The cable serves as the high-voltage end, enabling high-voltage electrical pulse input, while the metal regulating rod connects to the low-voltage end, forming the low-voltage part of the discharge circuit and enabling the entire discharge circuit to conduct.

[0012] Furthermore, two sets of parallel line electrodes are symmetrically fixed on both sides of the cable. Each set of parallel line electrodes includes multiple line electrodes arranged at equal intervals along a straight line. Each line electrode includes a central metal conductor and an outer insulating layer.

[0013] Furthermore, by adjusting the angle between the metal adjusting rod and the cable, the distance between the metal adjusting rod and the ends of different line electrodes can be controlled, thereby controlling the intensity of electrode discharge and achieving different frequencies of electrode discharge.

[0014] When the angle between the metal regulating rod and the cable is initially small, after the DC high voltage is input to the parallel sequence of line electrodes through the cable, each group of line electrodes generates an arc discharge. Due to the multi-stage parallel structure, the load impedance between the end of each line electrode and the metal regulating rod is relatively consistent, and the load voltage is maintained at a high level. Because the electric field strength of the gap between the intermediate metal conductors is large, each gap simultaneously completes water breakdown and conduction. At the instant all discharge gaps are connected, electrical energy is rapidly injected, the instantaneous power increases, and a violent discharge is generated in the middle of each gap, exciting a strong acoustic pulse, which flows back to the energy storage capacitor through the low-voltage end metal regulating rod.

[0015] By increasing the angle between the metal adjusting rod and the cable, the distance between the end of each wire electrode and the metal adjusting rod decreases, reducing the load impedance between the end of the wire electrode and the metal adjusting rod, increasing the current, and thus changing the frequency of the emitted sound pulse. During the process of increasing the angle between the metal adjusting rod and the cable, the distance between the end of each wire electrode and the metal adjusting rod changes differently from top to bottom, showing a gradually decreasing trend, and the frequencies of the emitted sound pulses also differ. Among them, the distance between the end of the uppermost wire electrode and the metal adjusting rod 1 decreases the most, resulting in the largest change in resistance and the largest current.

[0016] The pressure-resistant insulating enclosure is made of pressure-resistant insulating material to withstand the hydrostatic pressure of water during deep-sea operations, and does not constitute a component of the discharge circuit.

[0017] Preferably, the metal conductor in the middle of the wire electrode is made of tungsten steel or stainless steel and has a diameter of no more than 2 mm.

[0018] Preferably, the insulating layer outside the wire electrode is made of polytetrafluoroethylene or polyurethane material, with a diameter not exceeding 10 mm, and ensures that only the end portion of the metal conductor is exposed.

[0019] Preferably, in each group of parallel line electrodes, the interval between adjacent line electrodes is ≤5mm.

[0020] Preferably, one end of each of the two metal adjusting rods is fixed to the pressure-resistant insulating box via a rotatable locking hole.

[0021] Furthermore, the fixed support shell ensures a floating potential and does not constitute part of the discharge circuit.

[0022] Compared with the prior art, the present invention has the following beneficial effects: the underwater acoustic generator of the present invention is arranged in parallel and symmetrical arrangement on both sides of the cable, and the frequency can be effectively changed by changing the intensity of electrode discharge by adjusting the position of the "V"-shaped metal adjusting rod, which significantly improves the efficiency of the underwater acoustic generator. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of a fishbone-shaped electrode discharge underwater acoustic generator for adjusting frequency according to an embodiment of the present invention.

[0025] Figure 2 is a schematic diagram of the line electrodes in the parallel line electrode sequence.

[0026] Figure 3 is a schematic diagram of the adjustment process of the metal adjusting rod.

[0027] In the diagram: 1. Metal adjusting rod, 2. Cable, 3. Parallel sequence of line electrodes, 4. Pressure-resistant insulating box, 5. Fixed support shell, 3-1. Insulation layer, 3-2. Metal conductor. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that, unless otherwise specified, the features in the following embodiments and implementation methods can be combined with each other.

[0030] As shown in Figure 1, a fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment includes a fixed support shell 5, a pressure-resistant insulating box 4, a cable 2, two metal adjusting rods 1, and two sets of parallel line electrodes 3 arranged on the cable 2.

[0031] In this process, high-voltage DC power is input through cable 2, and two sets of parallel line electrodes 3 complete underwater discharge to achieve acoustic pulse. Then, the pulse current is returned through metal manual adjustment rod 1, and finally a discharge circuit is formed.

[0032] The distance between the metal adjusting rod 1 and the ends of different line electrodes is controlled by adjusting the angle between the metal adjusting rod 1 and the cable 2, thereby controlling the intensity of electrode discharge and achieving different frequencies of electrode discharge.

[0033] The fixed support shell 5 is used to fix the cable 2, while ensuring the floating potential and not forming part of the discharge circuit.

[0034] Two sets of parallel electrode sequences 3 are arranged symmetrically on both sides of the cable 2. As shown in Figure 2, each set of parallel electrode sequences 3 includes multiple wire electrodes arranged at equal intervals along a straight line. Each wire electrode includes a central metal conductor 3-2 and an outer insulating layer 3-1.

[0035] In this embodiment, in order to improve strength and hardness and reduce electrode ablation caused by electrode discharge, the preferred material for the intermediate metal conductor 3-2 is tungsten steel, and stainless steel is also an option, and the diameter is generally no more than 2 mm.

[0036] The insulation layer 3-1 is made of polytetrafluoroethylene or polyurethane and other non-metallic materials to ensure that only the head (i.e. the end part) of the metal conductor 3-2 is exposed, and the diameter is generally no more than 10mm.

[0037] In addition, to ensure the effective occurrence of electrode discharge, the distance between two adjacent line electrodes should generally not exceed 5 mm.

[0038] The working principle of this invention is as follows: When high-voltage DC electricity is input into the parallel sequence of line electrodes 3 through cable 2, each group of line electrodes generates an electric arc discharge. When the angle between the metal adjusting rod 1 and the cable 2 is initially small, due to the multi-stage parallel structure, the load impedance between the end of each line electrode and the metal adjusting rod 1 is relatively consistent, and the load voltage is maintained at a high level. Due to the large electric field strength in the gap of the intermediate metal conductor 3-2, each gap simultaneously completes water breakdown and conduction. At the instant all discharge gaps are connected, electrical energy is rapidly injected, the instantaneous power increases, and a violent discharge is generated in the middle of each gap, exciting a strong acoustic pulse, which flows back to the energy storage capacitor through the low-voltage end metal adjusting rod 1.

[0039] As shown in Figure 3, by increasing the angle between the metal adjusting rod 1 and the cable 2, the distance between the end of each wire electrode and the metal adjusting rod 1 decreases, reducing the load impedance between the end of the wire electrode and the metal adjusting rod 1, increasing the current, and thus changing the frequency of the emitted sound pulse. Figure 3 shows that during the process of increasing the angle between the metal adjusting rod 1 and the cable 2, the distance between the end of each wire electrode and the metal adjusting rod 1 changes differently from top to bottom, showing a gradually decreasing trend, and the frequencies of the emitted sound pulses also differ. Among them, the distance between the end of the uppermost wire electrode and the metal adjusting rod 1 decreases the most, resulting in the largest change in resistance and the largest current.

[0040] This invention discloses a fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment. The electrodes are arranged symmetrically on both sides of a cable 2. By adjusting the position of the metal adjusting rod 1, the frequency can be effectively changed by altering the intensity of the electrode discharge, significantly improving the efficiency of the underwater acoustic generator. Furthermore, the use of a pressure-resistant and insulated housing significantly extends the lifespan of the device.

[0041] The embodiments described above provide a detailed explanation of the technical solutions and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, additions, and equivalent substitutions made within the scope of the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment, characterized in that, The device includes a fixed support shell (5) and a pressure-resistant insulating box (4) and a cable (2) fixed on the fixed support shell (5); one end of the cable (2) is fixed to the pressure-resistant insulating box (4), and the other end serves as the high-voltage input terminal of DC high voltage; a set of parallel line electrodes in parallel sequence (3) are fixed on both sides of the cable (2); the pressure-resistant insulating box (4) is rotatably connected to one end of two metal adjusting rods (1), so that the two metal adjusting rods (1) are arranged in a V shape on both sides of the cable (2); the two metal adjusting rods (1) are connected to the line electrodes on the line electrode parallel sequence (3) through a sliding latch; DC high voltage is input through the cable (2), the two sets of line electrode parallel sequence (3) complete underwater discharge, realize acoustic pulse, and then complete the return of pulse current through the metal adjusting rods (1), and finally form a discharge circuit.

2. The fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment according to claim 1, characterized in that, Two sets of parallel line electrode sequences (3) are symmetrically fixed on both sides of the cable (2). Each set of parallel line electrode sequences (3) includes multiple line electrodes arranged at equal intervals along a straight line. Each line electrode includes a metal conductor in the middle and an outer insulating layer.

3. The fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment according to claim 2, characterized in that, The distance between the metal adjusting rod (1) and the ends of different line electrodes is controlled by adjusting the angle between the metal adjusting rod (1) and the cable (2), thereby controlling the intensity of electrode discharge and realizing different frequencies of electrode discharge.

4. The fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment according to claim 2, characterized in that, The metal conductor in the middle of the wire electrode is made of tungsten steel or stainless steel and has a diameter of no more than 2 mm.

5. The fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment according to claim 2, characterized in that, The insulating layer on the outside of the wire electrode is made of polytetrafluoroethylene or polyurethane material, with a diameter not exceeding 10 mm, and ensures that only the end part of the metal conductor is exposed.

6. The fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment according to claim 2, characterized in that, In each group of parallel line electrode sequences (3), the interval between adjacent line electrodes is ≤5mm.

7. The fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment according to claim 1, characterized in that, One end of the two metal adjusting rods (1) is fixed to the pressure-resistant insulating box through a rotatable lock hole.

8. The fishbone-shaped electrode discharge underwater acoustic generator for frequency adjustment according to claim 1, characterized in that, The fixed support shell (5) ensures the floating potential and does not constitute a component of the discharge circuit.

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