Mechanical vibration type sound source and manufacturing process of pressure-resistant shell of mechanical vibration type sound source

Abstract

The invention belongs to the technical field of underwater anti-interception, and particularly relates to a mechanical sound source. A mechanical vibration type sound source adopts the technical scheme that a pressure-resistant shell adopts a radiation diaphragm plate integrated design, the whole pressure-resistant shell is of a square barrel structure, and circular openings are formed in the two ends of the pressure-resistant shell; the excitation mechanism is mounted in the pressure-resistant shell and is driven by the driving mechanism; the end face rings are installed at the two ends of the pressure-resistant shell, and sealing rubber rings are arranged on the contact faces of the end face rings and the pressure-resistant shell. The end face cover plate and the end face ring are sealed in the radial direction and connected through bolts. And a bonding layer is coated on the outer surface of the pressure-resistant shell. The pressure-resistant shell is integrally designed, the purpose of structure miniaturization is achieved, and a mother ship can be conveniently launched, recycled and towed; and meanwhile, cracks caused by the fact that a welding seam between the radiation diaphragm plate and the pressure-resistant shell of a traditional mechanical vibration sound source is damaged under long-term periodic excitation are avoided, and the structural strength is improved. Meanwhile, the invention further discloses a manufacturing process of the mechanical vibration type sound source pressure-resistant shell.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater anti-eavesdropping, and in particular relates to a mechanical sound source and a manufacturing process of a pressure-resistant shell thereof. Background Art

[0002] The Sound Surveillance System (SOSUS) consists of a series of hydrophones deployed on the seabed and connected to the facilities on the shore for receiving, processing and analyzing acoustic signals. It can report the activities of surface ships and support the command and tactical forces of anti-submarine warfare by detecting, identifying, tracking and reporting submarine activities. The underwater acoustic listening network detection can obtain the basic parameters of the communication target, such as frequency, waveform, repetition period and power, by intercepting and analyzing the communication signal. At this time, if a more powerful sound source signal is used to suppress or interfere with the communication signal of the network and cover the communication signal spectrum, the normal working ability of the enemy communication receiver will be reduced or the normal working ability of the enemy communication receiver will be completely lost. At present, more advanced surface ships are generally equipped with jammers to counter sonar tracking. In essence, the broadband high-power noise of the jammer is used to interfere with the sonar, so that the enemy sonar cannot track the ship. Acoustic interference is a technical measure to block or suppress the reception of enemy sonar sound when the ship is tracked by the enemy sonar in order to get rid of the enemy sonar tracking. The acoustic jamming measure is actually to generate a strong broadband noise signal around the ship, so that the acoustic receiver of the enemy sonar has a blind spot, so that the enemy sonar cannot use acoustic means to track the ship. The acoustic receiver of the enemy sonar will experience reception anomalies after being interfered by the strong broadband noise signal, which can greatly reduce the tracking ability of the enemy sonar, so as to achieve the desired acoustic jamming effect.

[0003] Mechanical sound source is one of the existing strong sound interference suppression sound sources. This type of interference sound source can simulate the vibration noise generated by various working modes of ship power in the water for a long time and radiate a strong vibration level sound field to the surrounding waters, effectively interfering with the underwater sonar system or the corresponding underwater monitor, making the data collected by the underwater detective system greatly distorted. This interference sound source is also very convenient to use. It can cruise in important strategic waters or specific waters under the tow of a mother ship. When a suspicious ship or suspected target is found, it can approach the sea area and release a strong sound field, thereby interfering with the suspected ship or suspected underwater monitoring target to collect underwater data in the sea area. Moreover, this interference system has a wide range of uses, which can be used for scientific experiments and military purposes.

[0004] When designing a mechanical vibration sound source, its radiation diaphragm is usually welded to the pressure shell of the equipment. As a component of the pressure shell, the radiation diaphragm vibrates periodically at a certain vibration speed within a specific frequency range when it is affected by the excitation mechanism in the pressure shell, thereby radiating a strong sound field into the water. Mechanical vibration sound sources work underwater, and their pressure shells have high watertightness requirements. However, when working, the radiation diaphragm of the mechanical vibration sound source is subjected to high-frequency knocking by the excitation mechanism for a long time, and may also be subjected to external explosion shocks, causing the weld between the pressure shell and the radiation diaphragm to be damaged. The radiation diaphragm may also form cracks under long-term periodic motion, causing the equipment to fail to work normally. Summary of the invention

[0005] The purpose of the present invention is to provide a mechanical vibration sound source and a pressure-resistant shell manufacturing process thereof in view of the deficiencies in the prior art.

[0006] A technical solution of the present invention is: a mechanical vibration sound source, including: a pressure-resistant shell, an excitation mechanism, a driving mechanism, an end face ring and an end face cover plate.

[0007] The pressure-resistant shell adopts an integrated design of radiation membrane plates, and the overall structure is a square cylinder with circular openings at both ends; the excitation mechanism is installed in the pressure-resistant shell and driven by the driving mechanism.

[0008] Two end face rings are installed at two ends of the pressure-resistant shell through rivets, and sealing rubber rings are arranged on the contact surfaces between the end face rings and the pressure-resistant shell.

[0009] The end cover plate is radially sealed with the end ring and connected by bolts.

[0010] An adhesive layer is coated on the outer surface of the pressure hull.

[0011] Working principle:

[0012] When the mechanical vibration sound source is working, the driving mechanism, under the control of the upper control system, drives the excitation mechanism to start working in a certain working mode according to the requirements of the corresponding working system. The excitation mechanism will form a certain exciting force, which will act on the pressure hull periodically, causing the pressure hull to vibrate strongly, thereby radiating a strong sound field into the water, thereby achieving the purpose of interfering with and suppressing the enemy's underwater reconnaissance system.

[0013] Another technical solution of the present invention is: a manufacturing process of a mechanical vibration sound source pressure-resistant shell, comprising the following steps:

[0014] A. The pressure hull adopts an integrated design: the pressure hull is bent into shape by a combination of cold and hot machining, and then welded into one piece by welding technology.

[0015] Specific:

[0016] The pressure hull uses a radiation membrane plate. The pressure hull serves as the installation platform for the excitation mechanism and the drive mechanism, and at the same time forms a closed space to isolate the internal equipment from the external environment. During manufacturing, a whole sheet is selected. First, the sheet is rolled into shape through a combination of cold and hot machining to form a semi-finished product of the pressure hull.

[0017] Butt welding is adopted for the top of the semi-finished product. The pressure-resistant shell has only one weld on the top. To ensure full penetration, a 1mm to 2mm seam gap is required between the welding heads. The number of welds is minimized, and the purpose of overall forming is basically achieved. The main body of the pressure-resistant shell after manufacturing is a square cylinder structure with a circular end face.

[0018] B. The end face ring and the end face cover are formed by machining and welding. According to the requirements of the riveting setting, through holes for riveting are opened at the root and end of the pressure shell and the corresponding positions of the end face ring.

[0019] C. The sealing rubber ring is tightly fixed to the outer surface of the end ring by vulcanization or bonding process. The sealing rubber ring is made of wear-resistant and corrosion-resistant rubber material.

[0020] D. The pressure-resistant shell and the end face ring are riveted together using a riveting process.

[0021] Specifically:

[0022] The processed end face ring neck pair is installed into the pressure-resistant shell, and the joint surfaces of the two are kept close and fixed as much as possible through the tooling method. It should be pointed out that the overall force of the workpiece should be uniform as much as possible during the tooling assembly. The riveted through hole is used to assemble rivets so as to form the pressure-resistant shell and the end face ring into one. There are two types of riveting: cold riveting and hot riveting. According to the operating conditions and characteristics of the product, the present invention adopts cold riveting technology, which is characterized in that the rivets are gradually upset during the manufacturing process, and will gradually expand to the perforation diameter, so that the two form a gap-free fit. The purpose of this design is to greatly improve the impact resistance and seismic resistance of the pressure shell connection in the underwater equipment when the pressure shell is impacted by the internal excitation mechanism and the external environment. The overall component has small deformation during the processing, good fatigue resistance, and is insensitive to stress concentration. In addition, it has the characteristics of simple assembly process and reliable connection.

[0023] E. Carry out color inspection and non-destructive testing on the weld surface and each riveted point.

[0024] Since the mechanical vibration sound source operates under strong earthquake conditions underwater for a long time, in order to ensure the sealing performance of the welds and rivets on the pressure hull, the welding and riveted parts of the pressure hull are cleaned, polished, corrected and cleaned, and then the weld surface and each riveted point are color checked to ensure the quality of the welds and riveted points.

[0025] F. Brazing is used on the welds on the outer surface of structural parts and the outer surface of each riveted point.

[0026] First, the structural parts are subjected to ordinary welding treatment. In order to further enhance the watertightness of the structure, brazing is adopted on the outer surface welds of the external components and the outer surface of each riveted point. The inherent characteristics of brazing technology are utilized, that is, brazing requires a lower heating temperature during welding, the fluidity of the welding wire after melting is better than other welding processes, and it is not easy to produce defects such as cracks and pores after welding. The weld has good density, strong fatigue resistance, good elongation, etc. after welding. The watertightness of the welds and each riveted point on the pressure shell of the equipment is improved, and the sealing of the welding joints of the pressure shell when subjected to internal and external impact forces is further enhanced.

[0027] G. Apply adhesive on the outer surface of the welds on the structural parts and the outer surface of each riveted point.

[0028] Since the material composition of the welding wire used for brazing is quite different from that of the pressure-resistant shell, electrochemical corrosion is easy to occur during the use of the equipment, especially when working in seawater, which reduces the performance of the welding parts. In order to ensure the welding strength and corrosion resistance of the welding parts, the specific measures taken are: clean the brazing parts to ensure that the surface is clean. After the surface is clean, evenly apply a tough and high-strength adhesive on the corresponding surface of the pressure-resistant shell, keep it at room temperature for about 5 minutes, and evenly apply it again. After the bonding is completed, use a wooden hammer or a rubber hammer to evenly knock the outer surface of the bonding layer to discharge the bubbles on the two bonding surfaces and make the two close together. Then fix it with a binding tape for about 24 hours and remove it after the bonding is naturally dry.

[0029] H. Radial sealing is adopted between the end cover plate and the end ring. According to the design requirements of the underwater pressure hull, a sealing groove is opened on the end cover plate, and a suitable sealing ring is selected according to the design specifications. Then, the end cover plate is connected by bolts to form a complete mechanical vibration sound source pressure hull. The number of bolts shall also meet the design requirements of the underwater pressure hull.

[0030] Beneficial effects:

[0031] (1) The pressure hull of the present invention adopts an integrated design, which achieves the purpose of structural miniaturization and is convenient for deployment, recovery and towing by the mother ship; at the same time, it avoids the traditional mechanical vibration sound source radiation diaphragm and the pressure hull weld from being damaged and cracked under long-term periodic excitation, thereby improving the strength of the structure.

[0032] (2) In the present invention, the pressure-resistant shell and the end face ring are connected by riveting, which solves the problem that the welding part of the pressure-resistant shell is easy to crack when it is impacted by long-term and high-frequency cycles, and improves the strength and fatigue resistance of the structure.

[0033] (3) The pressure-resistant shell of the present invention adopts a processing technology of general welding + brazing + vulcanization bonding, which can isolate the weld of the pressure-resistant shell after welding from the external seawater, effectively preventing the welding point from contacting with seawater and causing electrochemical corrosion. At the same time, the brazing and vulcanization technology can ensure the sealing of the welding point even if tiny cracks appear at the welding point during operation, thereby improving the watertight performance of the pressure-resistant shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] In the figure: 1-pressure-resistant shell, 2-vibration excitation mechanism, 3-driving mechanism, 4-rivet, 5-sealing rubber ring, 6-adhesive layer, 7-end face ring, 8-end face cover plate. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] Embodiment 1:

[0038] See attached Figure 1 A mechanical vibration sound source includes: a pressure-resistant shell 1, an excitation mechanism 2, a driving mechanism 3, an end face ring 7 and an end face cover plate 8.

[0039] The pressure-resistant shell 1 adopts an integrated design of a radiation diaphragm, and is a square cylindrical structure as a whole, with circular openings at both ends; the excitation mechanism 2 is installed in the pressure-resistant shell 1 and is driven by the driving mechanism 3.

[0040] Two end face rings 7 are mounted on both ends of the pressure-resistant shell 1 through rivets 4 , and a sealing rubber ring 5 is provided on the contact surface between the end face ring 7 and the pressure-resistant shell 1 .

[0041] The end face cover plate 8 is radially sealed with the end face ring 7 and is connected by bolts.

[0042] An adhesive layer 6 is coated on the outer surface of the pressure-resistant casing 1 .

[0043] Working principle:

[0044] When the mechanical vibration sound source is working, the driving mechanism 3, under the control of the upper control system, drives the excitation mechanism 2 to start working in a certain working mode according to the requirements of the corresponding working system. The excitation mechanism 2 will form a certain exciting force, which will act on the pressure-resistant shell 1 periodically, causing the pressure-resistant shell 1 to vibrate strongly, thereby radiating a strong sound field into the water, thereby achieving the purpose of interfering with and suppressing the enemy's underwater reconnaissance system.

[0045] Embodiment 2:

[0046] A manufacturing process of a mechanical vibration sound source pressure-resistant shell comprises the following steps:

[0047] A. The pressure hull 1 adopts an integrated design: the pressure hull 1 is bent and formed by a combination of cold and hot machining, and the pressure hull 1 is welded into one piece by welding technology.

[0048] Specific:

[0049] The pressure-resistant shell 1 uses a radiation membrane plate, and the pressure-resistant shell 1 serves as a mounting platform for the excitation mechanism 2 and the driving mechanism 3, and at the same time forms a closed space to isolate the internal equipment from the external environment. During manufacturing, a whole sheet of sheet is selected, and the sheet is firstly rolled into shape by a combination of cold and hot machining to form a semi-finished product of the pressure-resistant shell 1.

[0050] The top of the semi-finished product is butt-welded, and the pressure-resistant shell 1 has only one weld on the top. To ensure full penetration, a 1mm to 2mm seam gap is required between the welding heads. The main body of the pressure-resistant shell 1 after manufacturing is a square cylinder structure, and the end face is a circular structure.

[0051] B. The end face ring 7 and the end face cover plate 8 are formed by machining and welding. According to the requirements of riveting setting, through holes for riveting are opened at the root and end of the pressure hull 1 and the corresponding positions of the end face ring 7.

[0052] C. Use vulcanization or bonding process to tightly fix the sealing rubber ring 5 and the outer surface of the end ring 7. The sealing rubber ring 5 is made of wear-resistant and corrosion-resistant rubber material.

[0053] D. The pressure-resistant shell 1 and the end face ring 7 are riveted together by a riveting process.

[0054] Specifically:

[0055] The processed end face ring 7 neck pair is installed into the pressure-resistant shell 1, and the joint surfaces of the two are kept close and fixed as much as possible through the tooling method. It should be pointed out that the overall force of the workpiece should be uniform as much as possible during the tooling assembly. The riveted through hole is used to assemble rivets so as to form the pressure-resistant shell 1 and the end face ring 7 into one body. There are two types of riveting: cold riveting and hot riveting. According to the use conditions and characteristics of the product, the present invention adopts cold riveting technology, which is characterized in that the rivet 4 is gradually upset during the manufacturing process, and will gradually expand the perforation diameter so that the two form a gapless fit. The purpose of this design is to make the pressure-resistant shell 1 in the underwater equipment The impact resistance and seismic resistance of the connection of the pressure-resistant shell 1 are greatly improved when it is impacted by the internal excitation mechanism 2 and the external environment. The overall component is less deformed during the processing, has good fatigue resistance, is insensitive to stress concentration, and has the characteristics of simple assembly process and reliable connection.

[0056] E. Carry out color inspection and non-destructive testing on the weld surface and each riveted point.

[0057] Since the mechanical vibration sound source operates under strong earthquake conditions underwater for a long time, in order to ensure the sealing performance of the welds and rivets on the pressure hull 1, the welding and riveted parts of the pressure hull 1 are cleaned, polished, corrected and cleaned, and then the weld surface and each riveted point are color checked to ensure the quality of the welds and each riveted point.

[0058] F. Brazing is used on the welds on the outer surface of structural parts and the outer surface of each riveted point.

[0059] First, the structural parts are subjected to ordinary welding treatment. To further enhance the water tightness of the structure, brazing is adopted on the welds on the outer surface of the external components and the outer surface of each riveted point. The inherent characteristics of the brazing technology are utilized, i.e., brazing requires a lower heating temperature during welding, the fluidity of the welding wire after melting is better than other welding processes, and it is not easy to produce defects such as cracks and pores after welding. The welds after welding have good density, strong fatigue resistance, good elongation, etc., thereby improving the water tightness of the welds and each riveted point on the pressure shell of the equipment, and further enhancing the sealing of the welding joints of the pressure shell 1 when subjected to internal and external impact forces.

[0060] G. Apply adhesive on the outer surface of the welds on the structural parts and the outer surface of each riveted point.

[0061] Since the material composition of the welding wire used for brazing is quite different from that of the pressure-resistant shell 1, electrochemical corrosion is easily generated during the use of the equipment, especially when working in seawater, which reduces the performance of the welding parts. In order to ensure the welding strength and corrosion resistance of the welding parts, the specific measures taken are: clean the brazing parts to ensure that the surface is clean. After the surface is clean, evenly apply a tough and high-strength adhesive on the corresponding surface of the pressure-resistant shell 1, keep it at room temperature for about 5 minutes, and evenly apply it again. After the bonding is completed, use a wooden hammer or a rubber hammer to evenly knock the outer surface of the bonding layer 6 to discharge the bubbles on the two bonding surfaces so that the two are tightly attached to each other. Then fix it with a binding tape for about 24 hours and remove it after the bonding is naturally dry.

[0062] H. Radial sealing is adopted between the end cover plate 8 and the end ring 7. Referring to the design requirements of the underwater pressure hull, a sealing groove is opened on the end cover plate 8, and a suitable sealing ring is selected according to the design specifications. Then, the sealing ring is connected by bolts to form a complete mechanical vibration sound source pressure hull. The number of bolts shall also meet the design requirements of the underwater pressure hull.

[0063] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A mechanical vibration sound source, characterized in that: include: A pressure-resistant shell (1), a vibration excitation mechanism (2), a driving mechanism (3), an end face ring (7), and an end face cover plate (8); The pressure-resistant shell (1) adopts an integrated radiation diaphragm design and is a square cylindrical structure with circular openings at both ends; the excitation mechanism (2) is installed in the pressure-resistant shell (1) and is driven by the driving mechanism (3); The two end face rings (7) are mounted on the two ends of the pressure-resistant shell (1) via rivets (4), and a sealing rubber ring (5) is provided on the contact surface between the end face ring (7) and the pressure-resistant shell (1); The end face cover plate (8) is radially sealed with the end face ring (7) and connected by bolts; An adhesive layer (6) is coated on the outer surface of the pressure-resistant casing (1).

2. A manufacturing process for a mechanical vibration sound source pressure-resistant shell, characterized in that: The following steps are involved: A. The pressure-resistant shell (1) adopts an integrated design: the pressure-resistant shell (1) is bent and formed by a combination of cold and hot machining, and the pressure-resistant shell (1) is welded into one piece by welding technology; B. The end face ring (7) and the end face cover plate (8) are formed by machining and welding; C. Using a vulcanization or gluing process to tightly fix the sealing rubber ring (5) and the outer surface of the end face ring (7) into one; D. riveting the pressure-resistant shell (1) and the end face ring (7) into shape by using a riveting process; E. Carry out color inspection and non-destructive testing on the weld surface and each riveted point; F. Brazing is used on the welds on the outer surface of the structural parts and the outer surface of each riveted point; G. Apply adhesive to the outer surface of the welds on the structural parts and the outer surface of each riveted point; H. The end face cover plate (8) and the end face ring (7) are radially sealed and then fixedly connected to form a complete mechanical vibration sound source pressure-resistant shell.

3. A manufacturing process for a mechanical vibration sound source pressure-resistant shell according to claim 2, characterized in that: In step A: The pressure-resistant shell (1) is made of a radiation film plate, and the plate is rolled and formed by a combination of cold and hot machining methods to firstly manufacture a semi-finished product of the pressure-resistant shell (1); The semi-finished pressure-resistant shell (1) is butt-welded at the top, leaving only one weld seam at the top, and a seam gap of 1 mm to 2 mm is required between the welding heads. After manufacturing, the pressure-resistant shell (1) is a square cylinder structure with a circular end face.

4. A manufacturing process for a mechanical vibration sound source pressure-resistant shell according to claim 2 or 3, characterized in that: In the step F: The structural parts are first subjected to ordinary welding, and then the welds are brazed.

5. A manufacturing process for a mechanical vibration sound source pressure-resistant shell according to claim 2 or 3, characterized in that: In the step G: First, the brazing area is cleaned. After the surface is clean, the adhesive is evenly applied to the surface of the pressure-resistant shell (1). After keeping it at room temperature for 5 minutes, it is evenly applied again. After the bonding is completed, the outer surface of the bonding layer (6) is evenly knocked with a wooden hammer or a rubber hammer to expel bubbles. It is then fixed with a binding tape for 24 hours and removed after the bonding is naturally dry.

6. A manufacturing process for a mechanical vibration sound source pressure-resistant shell according to claim 2 or 3, characterized in that: In the step H: According to the design requirements of the underwater pressure-resistant shell, a sealing groove is opened on the end cover plate (8), a sealing ring is selected, and then connected to the end ring (7) by bolts. The number of bolts should also meet the design requirements of the underwater pressure-resistant shell.

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