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

Abstract

The application belongs to the technical field of underwater anti-detection, and particularly relates to a mechanical sound source. The technical scheme of the mechanical vibration type sound source is as follows: the pressure-resistant shell is designed in an integrated manner with a radiation diaphragm, and has a square cylinder structure with circular openings at two ends; a vibration exciting mechanism is installed in the pressure-resistant shell and is driven by a driving mechanism; end face rings are installed at the two ends of the pressure-resistant shell, and sealing rubber rings are arranged on the contact surfaces between the end face rings and the pressure-resistant shell; end face cover plates are radially sealed with the end face rings and are connected through bolts; and an adhesive layer is coated on the outer surface of the pressure-resistant shell. The pressure-resistant shell in the application is designed in an integrated manner, so that the structure is miniaturized, the mother ship is convenient to lay, recover and tow, and the welding seams between the radiation diaphragm and the pressure-resistant shell of the traditional mechanical vibration sound source are prevented from being damaged and cracked under long-term periodic excitation, so that the strength of the structure is improved. Meanwhile, the application also discloses a manufacturing process of the pressure-resistant shell of the mechanical vibration type sound source.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underwater anti-detection, and particularly relates to a mechanical sound source and a manufacturing process of a pressure-resistant shell thereof. BACKGROUND

[0002] A SOSUS (Sound Surveillance System) is composed of a series of hydrophones laid on the seabed and connected with facilities on the shore for receiving, processing and acoustic analysis of acoustic signals, which can report the activities of surface ships and support the command of anti-submarine warfare and its tactical forces by detecting, identifying, tracking and reporting submarine activities. The detection of a SOSUS network can obtain the basic parameters of a communication target, such as frequency, waveform, repetition period and power, by intercepting and analyzing communication signals. At this time, if a stronger power sound source signal is used to suppress or interfere with the communication signals of the network and cover the spectrum of the communication signals, the normal working ability of the enemy communication receiver will be reduced or completely lost. At present, more advanced surface ships are generally equipped with jamming devices to counter sonar tracking, which is essentially to use the wideband high-power noise of the jamming device to interfere with the sonar, so that the enemy sonar cannot track the ship. Acoustic jamming is a technical measure to block or suppress the sound reception of the enemy sonar when the ship is tracked by the enemy sonar. The measure of acoustic jamming actually produces a strong wideband noise signal around the ship, so that the sound receiver of the enemy sonar appears blind, so that the enemy sonar cannot track the ship by acoustic means. After the sound receiver of the enemy sonar is disturbed by the strong wideband noise signal, the reception will be abnormal, which can greatly reduce the tracking ability of the enemy sonar to achieve the desired acoustic jamming effect.

[0003] As a kind of existing strong acoustic jamming suppression sound source, the mechanical sound source can simulate the vibration noise generated by various working modes of ship power for a long time and radiate a strong vibration level sound field to the surrounding water area, effectively interfering with underwater sonar systems or corresponding underwater monitors, so that the data collected by the underwater detection system is greatly distorted. This type of interference sound source is also very convenient to apply. It can be towed by a mother ship to cruise in important or specific sea areas. When a suspicious ship or suspected target is found, it can approach the sea area and release a powerful sound field, thereby interfering with the suspected ship or suspected underwater monitoring target in collecting underwater data in the sea area. Moreover, this interference system has a wide range of applications.

[0004] The radiation diaphragm of the mechanical vibration sound source is usually welded with the pressure-resistant shell as a whole in the design, and the radiation diaphragm as a part of the pressure-resistant shell periodically vibrates at a certain vibration speed in a specific frequency range when subjected to the action of the exciting mechanism in the pressure-resistant shell, thereby radiating a strong sound field to the water. The mechanical vibration sound source works underwater, and the pressure-resistant shell has a high water-tightness requirement. However, the radiation diaphragm of the mechanical vibration sound source is subjected to the high-frequency knocking of the exciting mechanism and the explosion impact from the outside during work, which damages the weld between the pressure-resistant shell and the radiation diaphragm, and cracks may be formed in the radiation diaphragm during long-term periodic movement, thereby causing the device to fail to work normally. SUMMARY

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

[0006] One technical solution of the present application is a mechanical vibration sound source, comprising a pressure-resistant shell, an exciting mechanism, a driving mechanism, an end face ring, and an end face cover plate.

[0007] The pressure-resistant shell is designed in an integrated manner with the radiation diaphragm, and has a square cylindrical structure with circular openings at both ends.

[0008] The two end face rings are installed at both ends of the pressure-resistant shell by rivets, and a sealing rubber ring is arranged on the contact surface between the end face ring and the pressure-resistant shell.

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

[0010] An adhesive layer is coated on the outer surface of the pressure-resistant shell.

[0011] Working principle:

[0012] When the mechanical vibration sound source works, the driving mechanism is controlled by the upper control system according to the requirements of the corresponding working system, and drives the exciting mechanism to work in a certain mode. The exciting mechanism forms a certain exciting force and periodically acts on the pressure-resistant shell, causing strong vibration of the pressure-resistant shell, thereby radiating a strong sound field to the water, and achieving the purpose of interfering with and suppressing the enemy's underwater detection system.

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

[0014] A. The pressure-resistant shell is designed in an integrated manner: the pressure-resistant shell is bent and formed by a cold and hot machine combined method, and is welded into a whole by welding technology.

[0015] Specifically:

[0016] The pressure-resistant shell is made of a radiation film plate. The pressure-resistant shell serves as a mounting platform for the exciting mechanism and the driving mechanism, and forms a sealed space to isolate the internal equipment from the external environment. When manufactured, a whole plate is selected. First, the plate is wound and formed by a combination of cold and hot machining to make a semi-finished product of the pressure-resistant shell.

[0017] The top of the semi-finished product is butt welded. The pressure-resistant shell has only one weld seam at the top. To ensure complete penetration, a gap of 1-2 mm is required between the welding heads, which reduces the number of weld seams as much as possible and basically achieves the purpose of overall forming. The main body of the pressure-resistant shell after forming is a square cylindrical structure, and the end face is a circular structure.

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

[0019] C. The sealing rubber ring is tightly integrated with the outer surface of the end face ring by vulcanization or gluing process. The sealing rubber ring is made of rubber material that is wear-resistant and corrosion-resistant.

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

[0021] Specifically,

[0022] The neck of the processed end face ring is fitted into the pressure-resistant shell. The fitting method is used to ensure that the combined surfaces are tightly fixed. It should be noted that the workpiece should be subjected to uniform stress during assembly. The riveting holes are used to assemble rivets to integrate the pressure-resistant shell and the end face ring. There are two types of cold riveting and hot riveting. According to the working conditions and characteristics of the product, the cold riveting technology is used in the present application. The cold riveting technology gradually thickens the rivet during processing, gradually expands the hole diameter, and forms a gapless fit. The purpose of this design is to improve the impact resistance and shock resistance of the connection between the pressure-resistant shell and the underwater equipment. The overall component deformation is small during processing, the fatigue resistance is good, and the stress concentration is not sensitive. In addition, the assembly process is simple, the connection is reliable, and other characteristics are also possessed.

[0023] E. Color inspection and non-destructive testing are performed on the weld surface and each riveting point.

[0024] Due to the long-term operation of the mechanical vibration type sound source in the underwater strong shock level state, in order to ensure the sealing performance of the pressure-resistant shell and the weld and riveting parts, the weld surface and each riveting point are subjected to color inspection after cleaning, polishing, correction and cleaning treatment of the weld surface and each riveting point to ensure the quality of the weld and each riveting point.

[0025] F. Brazing on the outer surface of the welds of the structural member and the outer surface of each riveting point.

[0026] First, the structural member is subjected to ordinary welding treatment, and for further strengthening the water tightness of the structure, brazing is used on the outer surface of the welds of the outer member and the outer surface of each riveting point, and the inherent characteristics of brazing technology are utilized, i.e. the brazing requires a lower heating temperature during welding, the flowability of the welding wire after melting is better than that during other welding, the defects such as cracks and pores are not easy to occur after welding, the weld compactness is good, the fatigue resistance is strong, the elongation is good, etc., thereby improving the water tightness of the welds of the equipment pressure shell and each riveting point, and further strengthening the sealing property of the pressure shell at the welded portion under the action of internal and external impact forces.

[0027] G. Smearing adhesive on the outer surface of the welds of the structural member and the outer surface of each riveting point.

[0028] Due to the great difference between the material composition of the welding wire used for brazing and the pressure shell, electrochemical corrosion is easy to occur during the use of the equipment, especially when working in seawater, thereby reducing the performance of the welded portion. In order to ensure the welding strength and corrosion resistance of the welded portion, the specific measures are as follows: cleaning the brazed portion to ensure the surface cleanliness, evenly smearing the adhesive with good toughness and high strength on the corresponding surface of the pressure shell after the surface is clean, keeping for about 5 minutes in the room temperature state, evenly smearing again, knocking the outer surface of the adhesive layer evenly with a wooden hammer or a rubber hammer after the adhesion is completed, so as to discharge the air bubbles between the two adhered surfaces and make them tightly adhere to each other, then fixing with a binding belt for about 24 hours, and removing after the adhesion is naturally dry.

[0029] H. Radial sealing is used between the end face cover plate and the end face ring, a sealing groove is opened on the end face cover plate according to the design requirements of the underwater pressure shell, and a suitable sealing ring is selected according to the design specification, and then the bolt connection is made, so as to form a complete mechanical vibration type sound source pressure shell, and the number of bolts should also meet the design requirements of the underwater pressure shell.

[0030] Advantages:

[0031] (1) The pressure shell in the application adopts integrated design, which achieves the purpose of structural miniaturization, is convenient for the mother ship to lay and recover and is towed, and avoids the damage of the traditional mechanical vibration sound source radiating membrane plate and the weld of the pressure shell under long-term periodic excitation to form cracks, thereby improving the strength of the structure.

[0032] (2) The pressure shell and the end face ring in the application adopt the riveting connection mode, which solves the problem that the welds are easy to crack when the pressure shell is subjected to long-term and high-frequency impact, thereby improving the strength and fatigue resistance of the structure.

[0033] (3) the pressure-resistant shell in the present application adopts the processing technology of general welding+ brazing+ vulcanization bonding, the welding seam of the pressure-resistant shell after being formed by welding is isolated from the external environment seawater, the electrochemical corrosion caused by the contact between the welding seam and seawater is effectively prevented, and even if a tiny crack occurs at the welding seam during work, the sealing of the place can be ensured by using brazing and vulcanization technology, and the water-tightness of the pressure-resistant shell is improved. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0036] The present application will be further described in detail below in combination with the drawings and examples.

[0037] Example 1:

[0038] Referring to the accompanying drawings, Figure 1 A mechanical vibration type sound source comprises 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.

[0039] The pressure-resistant shell 1 adopts a radiation membrane plate integrated design and has a square cylindrical structure as a whole with circular openings at both ends; the vibration 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 installed at both ends of the pressure-resistant shell 1 by rivets 4, and a sealing rubber ring 5 is arranged 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] A bonding layer 6 is coated on the outer surface of the pressure-resistant shell 1.

[0043] Working principle:

[0044] When the mechanical vibration type sound source works, the driving mechanism 3 is controlled by the upper layer control system, drives the vibration excitation mechanism 2 to work in a certain mode according to the requirements of the corresponding working system, the vibration excitation mechanism 2 forms a certain vibration force and periodically acts on the pressure-resistant shell 1, causing strong vibration of the pressure-resistant shell 1, thereby radiating a strong sound field to the water, and further achieving the purpose of interfering with and suppressing the enemy's underwater detective system.

[0045] Example 2:

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

[0047] A. The pressure-resistant shell 1 is designed in one piece: the pressure-resistant shell 1 is folded by cold and hot machining, and is welded into one piece.

[0048] Specifically:

[0049] The pressure-resistant shell 1 is made of a radiation film plate. The pressure-resistant shell 1 is used as the mounting platform of the exciting mechanism 2 and the driving mechanism 3, and forms a sealed space to isolate the internal equipment from the external environment. When manufacturing, a whole plate is used. First, the plate is wound by 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. The pressure-resistant shell 1 has only one weld at the top. In order to ensure penetration, a gap of 1mm to 2mm is left between the welding heads. The main body of the pressure-resistant shell 1 after forming is a square cylindrical structure, and the end face is a circular structure.

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

[0052] C. The sealing rubber ring 5 is tightly fixed to the outer surface of the end face ring 7 by vulcanization or gluing process. The sealing rubber ring 5 is made of rubber material that is wear-resistant and corrosion-resistant.

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

[0054] Specifically:

[0055] The neck of the processed end face ring 7 is fitted into the pressure-resistant shell 1. The combination surface is as tightly fixed as possible by the method of tooling. It should be noted that the workpiece should be stressed evenly as a whole during tooling assembly. The riveting holes are used to assemble the rivets to form the pressure-resistant shell 1 and the end face ring 7 into one piece. There are two types of cold riveting and hot riveting. According to the working conditions and characteristics of the product, the cold riveting technology is used in the present application. The rivet 4 is gradually upset during the processing, which gradually fills the hole diameter, so that the two are formed without gap. The purpose of this design is to improve the impact resistance and shock resistance of the connection of the pressure-resistant shell 1 in the underwater equipment when the internal exciting mechanism 2 and the external environment impact. The overall component deformation is small during processing, and the fatigue resistance is good, and it is not sensitive to stress concentration. In addition, it also has the characteristics of simple assembly process and reliable connection.

[0056] E. The weld surface and each riveting point are checked by coloring and non-destructive testing.

[0057] In order to ensure the sealing performance of the welding joint and riveting position of the pressure hull 1, the welding joint and riveting position of the pressure hull 1 are cleaned, polished, corrected and cleaned, and then the welding joint surface and each riveting point are checked by coloring, so as to ensure the quality of the welding joint and each riveting point.

[0058] F. The outer surface of the welding joint and each riveting point on the outer surface of the structural member is brazed.

[0059] First, the structural member is subjected to ordinary welding treatment. In order to further enhance the water tightness of the structure, the outer surface of the welding joint and each riveting point on the outer surface of the outer member is brazed. The brazing technology has the characteristics that the brazing requires a low heating temperature, the welding wire has good flowability after melting, the welding joint is not prone to defects such as cracks and pores after welding, the welding joint has good tightness, high fatigue resistance and good elongation, and the like. The water tightness of the welding joint and each riveting point on the pressure hull of the equipment is improved, and the sealing performance of the welding joint of the pressure hull 1 under the action of internal and external impact forces is further enhanced.

[0060] G. The outer surface of the welding joint and each riveting point on the outer surface of the structural member is coated with an adhesive.

[0061] Because the material composition of the welding wire used for brazing is greatly different from that of the pressure hull 1, electrochemical corrosion is prone to occur during the use of the equipment, especially when the equipment is used in seawater, which reduces the performance of the welding joint. In order to ensure the welding strength and corrosion resistance of the welding joint, the following specific measures are taken: the brazed position is cleaned to ensure the cleanliness of the surface, the surface is dried, and then a high-strength and high-toughness adhesive is uniformly coated on the corresponding surface of the pressure hull 1. The adhesive is maintained at room temperature for about 5 minutes, and then uniformly coated again. After the adhesive is bonded, the outer surface of the adhesive layer 6 is uniformly struck with a wooden hammer or a rubber hammer to remove the air bubbles between the two adhered surfaces and make the two surfaces tightly adhere to each other. Then, the adhered surfaces are fixed with a binding belt for about 24 hours, and then removed after the adhesive is naturally dried.

[0062] H. The radial seal is used between the end face cover plate 8 and the end face ring 7. According to the design requirements of the underwater pressure hull, a sealing groove is formed in the end face cover plate 8, and a suitable sealing ring is selected according to the design specification. Then, the complete mechanical vibration type sound source pressure hull is formed by bolt connection. The number of bolts should also meet the design requirements of the underwater pressure hull.

[0063] Although the present application has been described in detail by the general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A manufacturing process of a pressure-resistant case of a mechanical vibration type acoustic source, characterized by, It comprises the following steps: Step A. The pressure-resistant shell (1) is designed in one piece: the pressure-resistant shell (1) is bent and formed by a combination of cold and hot machining methods, and the pressure-resistant shell (1) is welded in one piece by welding technology; Step B. The end face ring (7) and the end face cover plate (8) are made by machining and welding; Step C. The sealing rubber ring (5) is tightly fixed to the outer surface of the end face ring (7) by vulcanization or gluing process; Step D. The pressure-resistant shell (1) and the end face ring (7) are riveted by riveting process; Step E. The weld surface and each riveting point are checked for coloring and non-destructive testing; Step F. Brazing is used on the outer surface of the weld surface and each riveting point on the outer surface of the structural member; Step G. On the outer surface of the weld surface and each riveting point on the outer surface of the structural member, adhesive is applied; Step 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 type sound source pressure-resistant shell.

2. The manufacturing process of a pressure-resistant shell of a mechanical vibration acoustic source according to claim 1, wherein, In the step A: The pressure-resistant shell (1) is made of a radiating membrane plate, which is wound and formed by a combination of cold and hot machining methods. First, the semi-finished product of the pressure-resistant shell (1) is made; The top of the semi-finished product of the pressure-resistant shell (1) is butt welded, leaving only one weld on the top. A 1mm-2mm gap is left between the welding heads. The formed pressure-resistant shell (1) is a square cylindrical structure, and the end face is a circular structure.

3. The manufacturing process of a pressure-resistant casing of a mechanical vibration acoustic source according to claim 1 or 2, characterized in that, In the step G: First, clean the brazed parts. After the surface is clean, evenly apply adhesive to the surface of the pressure-resistant shell (1). After 5 minutes at room temperature, apply it again. After the adhesive is applied, use a wooden hammer or rubber hammer to evenly strike the outer surface of the adhesive layer (6) to expel air bubbles. Then, use a binding belt to fix it for 24 hours. After the adhesive naturally dries, remove it.

4. The manufacturing process of a pressure-resistant casing of a mechanical vibration acoustic source according to claim 1 or 2, characterized in that, In the step H: According to the design requirements of the underwater pressure-resistant shell, a sealing groove is opened in the end face cover plate (8), a sealing ring is selected, and then the end face ring (7) is connected by bolts. The number of bolts should also meet the design requirements of the underwater pressure-resistant shell.

5. A mechanical vibration acoustic source, characterized by, It comprises: The pressure-resistant shell (1), the excitation mechanism (2), the driving mechanism (3), the end face ring (7), and the end face cover plate (8); The pressure-resistant shell (1) is made of the manufacturing process of any one of the above claims 1-4; The pressure-resistant shell (1) is designed in one piece with a radiating membrane plate, and the whole 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); Two end face rings (7) are installed at both ends of the pressure-resistant shell (1) by rivets (4). 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; The outer surface of the pressure-resistant shell (1) is coated with an adhesive layer (6).

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