CN104811879A - Multi-piezoelectric-ceramic-stack excitation deepwater broadband energy converter - Google Patents

Abstract

The invention relates to a multi-piezoelectric-ceramic-stack excitation deepwater broadband energy converter. The multi-piezoelectric-ceramic-stack excitation deepwater broadband energy converter comprises multiple piezoelectric ceramic stacks, a lower tubular end cap, pre-stress screw rod and an upper tubular end cap, wherein any one piezoelectric ceramic stack is installed between the lower tubular end cap and the upper tubular end cap through the pre-stress screw rod, and the multiple piezoelectric ceramic stacks are connected in parallel; and an interval is reserved between the top end of the lower tubular end cap and the bottom end of the upper tubular end cap. According to the invention, by use of multi-modal vibration of the piezoelectric stacks, an upper end plate and a lower end plate, large-broadband emission of the energy converter is realized, by use of the 33 work mode of the multiple piezoelectric stacks, the problems of quite large emission and reduced response which are brought by the anti-phase problem due to radial vibration of a circular pipe structure are reduced, and large-power emission is obtained.

Description

A Multi-piezoelectric Ceramic Stack Excited Deepwater Broadband Transducer

technical field

The invention relates to the fields of underwater acoustic communication, detection, and ocean deep water research, in particular, the invention relates to a multi-piezoelectric ceramic stack excitation deep water broadband transducer.

Background technique

The 21st century is the century of the ocean. The underwater acoustic transducer is an important means of understanding the ocean, and it is widely used in the fields of underwater acoustic communication, detection, and deep-water ocean research. At present, major marine resource countries attach unprecedented importance to marine resources and marine territories, and deep-sea development technology has become a hot spot, which requires underwater acoustic transducers to be able to work in deep water conditions. This puts forward higher requirements on the performance of underwater acoustic transducers.

The traditional deep-water broadband piezoelectric circular tube transducer adopts an open overflow structure. The transducer with this structure uses radial vibration and internal liquid cavity vibration to achieve broadband. Due to the problem of internal and external phase reversal in radial vibration, the transducer The emission voltage response of the energy generator is reduced.

Contents of the invention

The purpose of the present invention is to overcome the problem that the internal and external phase inversion of the underwater acoustic transducer in the prior art causes the emission response to be greatly reduced when it works in deep water, so as to provide a deep-water, wide-band transducer that can obtain a large emission voltage response. energy device.

In order to achieve the above object, the present invention provides a multi-piezoelectric ceramic stack excitation deep-water broadband transducer, including a piezoelectric ceramic stack 1, a lower cylindrical end cover 2, a prestressed screw 3 and an upper cylindrical end cover 4; wherein ,

There are multiple piezoelectric ceramic stacks 1, any piezoelectric ceramic stack 1 is installed between the lower cylindrical end cap 2 and the upper cylindrical end cap 4 through a prestressed screw 3, and the plurality of piezoelectric ceramic stacks The stacks 1 are connected in parallel; there is a gap between the uppermost end of the lower cylindrical end cap 2 and the lowermost end of the upper cylindrical end cap 4 .

The above technical solution also includes an elastic sound-transmitting cavity 5 and a compliance tube 6; wherein, the elastic sound-transmitting cavity 5 is located at the installed piezoelectric ceramic stack 1, the lower cylindrical end cover 2, the prestressed screw 3, the upper cylindrical Outside the end cap 4, the compliance tube 6 is installed inside it.

In the above technical solution, the outer jacket of the piezoelectric ceramic stack 1 is provided with a waterproof watertight layer; the watertight layer is made of polyurethane glue or vulcanized rubber, and the watertight layer is filled with an electrical insulating substance including castor oil.

In the above technical solution, the elastic sound-transmitting cavity 5 is filled with electrical insulating substances including castor oil and silicone oil, and the material inside the elastic sound-transmitting cavity 5 forms a watertight structure together with the elastic sound-transmitting cavity 5 .

In the above technical solution, round holes are opened at the middle positions of the lower cylindrical end cap 2 and the upper cylindrical end cap 4 .

In the above technical solution, the number of piezoelectric ceramic stacks 1 is between 4-12.

In the above technical solution, a prestressed screw 3 is installed at the center of a piezoelectric ceramic stack 1 .

In the above technical solution, a plurality of prestressed screw rods 3' are uniformly installed around a piezoelectric ceramic stack 1.

The advantages of the present invention are:

The transducer of the present invention is a circular tube overflow transducer composed of multiple piezoelectric ceramic stacks and perforated end caps. The large size of the transducer is realized by utilizing the multi-mode vibration of the piezoelectric stack and the upper and lower cover plates. Broadband emission, using the 33 working modes of the multi-piezoelectric stack, and reducing the problem of large emission response reduction caused by the anti-phase problem of the radial vibration of the circular tube structure, high-power emission is obtained.

Description of drawings

Fig. 1 is the structure schematic diagram in an embodiment of the multi-piezoelectric ceramic stack excitation deep-water broadband transducer of the present invention;

Fig. 2 is the structure schematic diagram of the multi-piezoelectric ceramic stack excitation deep-water broadband transducer in another embodiment of the present invention;

Fig. 3 is a kind of way that the multi-piezoelectric ceramic stack of the present invention excites the deep-water broadband transducer to apply prestress;

Fig. 4 is a diagram of the emission voltage response of the multi-piezoelectric ceramic stack excitation deep-water broadband transducer of the present invention.

Reference sign

1 Piezoelectric ceramic stack 2 Lower cylindrical end cap

3 Prestressed screw 3’ Prestressed screw

4 Upper cylindrical end cap 5 Elastic sound-permeable cavity

6 compliance tube

Detailed ways

The present invention will be further described now in conjunction with accompanying drawing.

Referring to FIG. 1 , in one embodiment, the multi-piezoelectric ceramic stack excitation deep-water broadband transducer includes: a piezoelectric ceramic stack 1 , a lower cylindrical end cover 2 , a prestressed screw 3 and an upper cylindrical end cover 4 . Wherein, there are multiple piezoelectric ceramic stacks 1, and any piezoelectric ceramic stack 1 is installed between the lower cylindrical end cap 2 and the upper cylindrical end cap 4 through a prestressed screw rod 3. The piezoelectric ceramic stacks 1 are connected in parallel; there is a gap between the uppermost end of the lower cylindrical end cap 2 and the lowermost end of the upper cylindrical end cap 4 .

Each component in the transducer will be further described below.

The piezoelectric ceramic stack 1 can be realized by using polarized PZT-4 or PZT-8 piezoelectric ceramics.

The outer casing of the piezoelectric ceramic stack 1 is provided with a watertight layer for waterproofing. The watertight layer can be made of polyurethane glue or vulcanized rubber, and the watertight layer can be filled with electrical insulating substances such as castor oil. The electrical insulating substance can play the roles of electrical insulation, heat dissipation, and pressure balance.

In the embodiment shown in FIG. 1 , the number of piezoelectric ceramic stacks 1 is six, and these piezoelectric ceramic stacks 1 are evenly and symmetrically distributed on the same circumference. In other embodiments, the number of piezoelectric ceramic stacks 1 is between 4 and 12, and these piezoelectric ceramic stacks 1 should also be uniformly and symmetrically distributed on the same circumference.

The parallel connection among the plurality of piezoelectric ceramic stacks 1 means that the positive poles of each piezoelectric ceramic stacks are connected with the positive poles, and the negative poles are connected with the negative poles.

In this embodiment, a circular hole is opened in the middle of the lower cylindrical end cap 2 and the upper cylindrical end cap 4, and in other optional embodiments, both may not have holes, but it will affect the performance of the sound field. have a certain impact.

The lower cylindrical end cap 2 and the upper cylindrical end cap 4 can be realized by using anti-rust duralumin.

The prestressed screw 3 is rigidly connected with the lower cylindrical end cap 2 and the upper cylindrical end cap 4 respectively, and the prestressed screw 3 can be realized by stainless steel.

Referring to Fig. 2, in another embodiment, the multi-piezoelectric ceramic stack excitation deep-water broadband transducer of the present invention also includes: an elastic sound-transmitting cavity 5 and a compliance tube 6; wherein, the elastic sound-transmitting cavity 5 is located in the installed In addition to the piezoelectric ceramic stack 1, the lower cylindrical end cap 2, the prestressed screw 3, and the upper cylindrical end cap 4, a compliance pipe 6 can be installed therein.

The elastic sound-permeable cavity 5 can play a waterproof role. In this embodiment, the jacket of the piezoelectric ceramic stack 1 may not be treated watertight, but the inside of the elastic sound-transmitting cavity 5 is filled with electrical insulating substances including castor oil and silicone oil. The sound-permeable cavity 5 together forms a watertight structure. In this way, the same pressure can be maintained with the surrounding water, and it will not be short-circuited under high pressure.

The compliance tube 6 is a closed cylindrical structure filled with air inside, which is located in the liquid inside the elastic sound-permeable cavity 5 , and the emission response performance of the transducer can be improved by utilizing its certain pressure resistance and compressibility.

In the embodiment shown in Figure 1, the prestressed screw 3 is located inside the piezoelectric ceramic stack 1, that is, the piezoelectric ceramic stack in this embodiment uses a central screw to apply prestress, in other embodiments, as shown in 3, prestressed screw rods 3' can be installed around the piezoelectric ceramic stack 1, and 4-6 prestressed screw rods 3' can be installed around each piezoelectric ceramic stack 1.

Fig. 4 is the transmission voltage response diagram of the multi-piezoelectric ceramic pile excitation deep water broadband transducer of the present invention, and this figure has reflected the acoustic performance of the transducer of the present invention, shows that this kind of structure can satisfy the situation of deep water work, Get broadband, high-power acoustic performance.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all of them should be included in the scope of the present invention. within the scope of the claims.

Claims (8)

1. A multi-piezoelectric ceramic stack excitation deep water broadband transducer is characterized by comprising a piezoelectric ceramic stack (1), a lower cylindrical end cover (2), a prestressed screw (3) and an upper cylindrical end cover (4); wherein,

the piezoelectric ceramic stacks (1) are multiple, any piezoelectric ceramic stack (1) is installed between the lower cylindrical end cover (2) and the upper cylindrical end cover (4) through a prestressed screw (3), and the piezoelectric ceramic stacks (1) are connected in parallel; and a space is reserved between the uppermost end of the lower cylindrical end cover (2) and the lowermost end of the upper cylindrical end cover (4).

2. The multi-piezo ceramic stack excited deep water broadband transducer according to claim 1, further comprising an elastic sound-transmitting cavity (5) and a compliant tube (6); the elastic sound-transmitting cavity (5) is positioned outside the mounted piezoelectric ceramic stack (1), the lower cylindrical end cover (2), the prestressed screw (3) and the upper cylindrical end cover (4), and the compliant pipe (6) is mounted in the elastic sound-transmitting cavity.

3. The deep water broadband transducer for excitation of multi-piezo ceramic stack according to claim 1 is characterized in that the outer jacket of piezo ceramic stack (1) is provided with watertight layer for waterproofing; the watertight layer is made of polyurethane glue or vulcanized rubber, and electric insulating materials including castor oil are filled in the watertight layer.

4. The multi-piezo ceramic stack deep water broadband transducer according to claim 2, characterized in that the elastic sound transmission cavity (5) is filled with an electrically insulating substance comprising castor oil, silicone oil, the substance inside the elastic sound transmission cavity (5) and the elastic sound transmission cavity (5) together form a watertight structure.

5. The deep water broadband transducer excited by multiple piezoelectric ceramic stacks of claim 1 or 2, wherein round holes are formed in the middle positions of the lower cylindrical end cover (2) and the upper cylindrical end cover (4).

6. Multi piezo-ceramic stack excited deep water broadband transducer according to claim 1 or 2, characterized in that the number of piezo-ceramic stacks (1) is between 4-12.

7. The deep water broadband transducer of multi-piezo ceramic stack excitation of claim 1, characterized by a pre-stressed screw (3) installed in the center of one piezo ceramic stack (1).

8. The deep water broadband transducer for excitation of multi-piezo ceramic stack according to claim 1 is characterized by that a plurality of pre-stressed screws (3') are installed evenly around one piezo ceramic stack (1).