CN-114609252-B - Liquid filling pipeline plane sound source

Abstract

The invention discloses a liquid filling pipeline planar sound source, which solves the problems of large volume, complex operation, poor adaptability and low-frequency sound radiation effect to be improved in the existing structure. The technical scheme includes that the sound source shell and set up the piston in the sound source shell, form the pressure regulating inner chamber between piston inner surface table and the sound source shell, the piston rod passes the sound source shell and connects piezoelectric actuator, the pressure regulating inner chamber communicates with measuring environment through the microchannel on the sound source shell, be equipped with the stop valve on the microchannel. The invention has simple structure, small volume, extremely simple operation, good low-frequency sound radiation effect and effectively improves the sound radiation efficiency of the piston, and can automatically balance the fluid pressure at two sides of the piston.

Inventors

• HOU JIUXIAO
• ZHU HAICHAO
• ZHANG FAN
• LIAO JINLONG

Assignees

• 中国人民解放军海军工程大学

Dates

Publication Date

20260505

Application Date

20220308

Claims (5)

1. 1. The planar sound source of the liquid filling pipeline comprises a sound source shell and a piston arranged in the sound source shell, wherein a pressure regulating inner cavity is formed between the inner surface of the piston and the sound source shell, and the piston rod penetrates through the sound source shell to be connected with a piezoelectric actuator; before measurement, the stop valve is opened to enable the pressure regulating inner cavity to be communicated with a measuring environment, liquid in the measuring environment enters the pressure regulating inner cavity through the micro-channel, and after the water pressures at two sides of the piston are balanced statically, the stop valve is closed to open the piezoelectric actuator.
2. 2. The liquid filled line planar sound source as defined in claim 1 wherein the piezoelectric actuator is affixed to the sound source housing via a bracket.
3. 3. The liquid filled line planar sound source of claim 1 wherein the diameter of the microchannel is 0.5-1.5mm.
4. 4. The liquid filled line planar sound source as defined in claim 1 wherein the piston rod is threadably connected to a piezoelectric actuator.
5. 5. The liquid filled pipeline planar sound source of claim 1 wherein the pressure regulating lumen is further provided with a pressure gauge on the conduit connected to the accumulator.

Description

Liquid filling pipeline plane sound source Technical Field The invention relates to the field of pipeline acoustic testing, in particular to a liquid filling pipeline planar sound source. Background The acoustic method is a main means in various fields such as underwater detection, measurement, target identification and positioning, marine geological exploration and the like, and in the aspect of underwater acoustic pipeline experiments, a very low-frequency and broadband sound source needs to be provided to serve as a test sound source so as to perform performance measurement and performance calibration on pipeline elements and underwater acoustic materials. The prior art comprises an electric transducer and a piezoelectric transducer, wherein the electric transducer used underwater generally comprises a vibration component, a permanent magnet component, a pressure compensation structure, a sealing structure and the like, and an inner cavity is air. The working principle is that a coil placed in a permanent magnetic field is subjected to a magnetic pushing force, and the pushing force pushes the coil to move in a piston mode, so that a radiation cover plate connected with the coil is pushed to move, and sound waves are radiated into water. To meet the radiation intensity requirements, the volume of the electrodynamic transducer is typically large to improve the low frequency acoustic radiation effect. In order to balance the fluid pressure on both sides of the piston, the piston chamber pressure must be adjusted to balance the fluid pressure on both sides of the piston. The existing electrodynamic transducer generally stores a certain amount of air or oil, and ensures the consistency of the internal pressure and the external water pressure by utilizing the volume of compressed gas or oil, so that the balance under different water depths is realized. CN102075828a discloses an underwater electrodynamic transducer, which consists of a transducer housing, a vibrating assembly, a guiding assembly, a supporting and sealing assembly, a magnetic circuit assembly, a sealing and electric interface, and can realize underwater low-frequency acoustic radiation. The invention adopts the magnetic circuit assembly to divide the inflatable air bag into two front and rear cavities, and the transducer is required to be completely placed in the water medium to compensate the pressure, so the invention has larger external dimension and is not suitable for being used in pipeline experiments. CN201310071343 discloses an electrodynamic type underwater sound emission transducer, the invention adjusts the pressure in an internal air spring cavity by means of external air charging equipment according to the output signal of a displacement sensor, realizes pressure balance at two sides of a piston, the acting force of the system is influenced by factors such as a coil, a magnetic pole and the like, the structural size is larger, and the pressure adjusting process is more complex. CN204231638U discloses a hydroacoustic piezoelectric transducer, uses sealing rubber to wrap piezoelectric ceramic pipe, electrode socket and supporting part inside and vulcanize as an organic wholely with piezoelectric ceramic pipe, base, electrode socket and supporting part, because this sound source is immersed in inside the liquid completely, its low frequency sound radiation effect is relatively poor, can't satisfy the acoustic test demand in the pipeline. Disclosure of Invention The invention aims to solve the technical problems, and provides the liquid filling pipeline planar sound source which has the advantages of simple structure, small volume, extremely simple operation, capability of automatically balancing the fluid pressure at two sides of the piston, good low-frequency sound radiation effect and capability of effectively improving the sound radiation efficiency of the piston. The technical scheme includes that the sound source shell to and set up the piston in the sound source shell, form the pressure regulating inner chamber between piston inner surface table and the sound source shell, the piston rod passes the sound source shell and connects piezoelectric actuator, the pressure regulating inner chamber communicates with measuring environment through the microchannel on the sound source shell, be equipped with the stop valve on the microchannel. The pressure regulating inner cavity is also connected with an energy accumulator through a pipeline. The piezoelectric actuator is fixed on the sound source shell through a bracket. The pressure regulating inner cavity is communicated with the measuring environment in the direction of the radiating surface of the piston through a micro-channel. The diameter of the micro-channel is 0.5-1.5mm. The piston rod is in threaded connection with the piezoelectric actuator. And a pressure gauge is further arranged on a pipeline connected with the pressure regulating inner cavity and the energy accumulator. In