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High-power composite piezoelectric transducer

A piezoelectric transducer, high-power technology, used in piezoelectric/electrostrictive transducers, sensors, electrical components, etc., can solve problems such as clogging of sandstone formations, reduced crude oil production, etc., and achieve increased radial displacement. , increased transmit power, easy to achieve effect

Inactive Publication Date: 2012-07-04
TIANJIN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The water injected during the oil production process contains certain impurities, which often block the pores of sandstone formations and eventually lead to a reduction in crude oil production

Method used

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  • High-power composite piezoelectric transducer
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Embodiment Construction

[0015] The high-power composite piezoelectric transducer of the present invention will be described in detail below with reference to the embodiments and drawings.

[0016] The vibrational modes of the long thin aluminum sleeve are the key factors for exciting the energy of the transducer. When the thin aluminum casing vibrates, there are both radial displacement and longitudinal displacement, and the two are coupled to each other. Using this coupling relationship, we can further increase the excitation energy of the transducer. That is to add prestress in the longitudinal direction of the thin aluminum casing, so that the thin aluminum casing is more likely to be excited to vibrate. In order to increase the longitudinal vibration displacement, we also increase the crystal pile in the longitudinal direction to make it vibrate with the thin aluminum casing. In this way, while the longitudinal vibration displacement of the thin aluminum sleeve is further increased, the displacem...

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Abstract

A high-power composite piezoelectric transducer comprises an aluminum sleeve arranged on a mass block, a piezoelectric tube fixedly embedded into the inner side of the aluminum sleeve via an underlay copper tube, a connector arranged at the top end of the aluminum sleeve, and a piezoelectric ceramic crystal pile connected to the upper end of the connector, which are fixedly connected via a pre-stressing screw in a transfixion center, wherein the piezoelectric ceramic crystal pile is composed of a plurality of piezoelectric ceramic crystal pieces with the same structure; the pre-stressing screw penetrates the mass block, an underlay copper tube, the piezoelectric tube, the aluminum sleeve, the connector and the center of the piezoelectric ceramic crystal pile; the upper and the lower ends of the pre-stressing screw are respectively fixed at the outer end parts of the piezoelectric ceramic crystal pile and the mass block; and the ratio of the length of the aluminum sleeve and the radius of the aluminum sleeve is 3:5. The high-power composite piezoelectric transducer provided by the invention is simple in structure and easy to realize; and vertical vibration is generated after the piezoelectric ceramic crystal pile is supplied for a voltage, so that the vertical vibration of a thin circular tube is generated, the vertical vibration of the tube is converted into radial vibration, further the radial displacement of the tube is enlarged, and the transmitting power of the transducer is improved.

Description

technical field [0001] The invention relates to an ultrasonic instrument. In particular, it relates to a high-power composite piezoelectric transducer used for ultrasonic treatment of low-permeability oil formation reconstruction and pore blockage in the process of petroleum exploration and development. Background technique [0002] Low-permeability wells require fracturing or ultrasonic operations to increase their permeability and increase crude oil production. The water injected during the oil production process contains certain impurities, and these impurities often block the pores of the sandstone formation, which eventually leads to a decrease in crude oil production. In the past, acid was used for cleaning to pollute formations and casings. Now, ultrasonic methods are used to remove plugs, and certain results have been achieved. Patent No. 2L95111968.0 discloses a high-power signal generator for this task. There are two kinds of transducers that are matched with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R17/00
Inventor 沈建国聂建华孙迎花
Owner TIANJIN UNIV
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