CN2281414Y

CN2281414Y - Piezo acoustic transducer

Info

Publication number: CN2281414Y
Application number: CN 96232909
Authority: CN
Inventors: 周存忠; 易甦平
Original assignee: CHENGDU SENSING TRANSDUCER TECHNOLOGY INST
Current assignee: CHENGDU SENSING TRANSDUCER TECHNOLOGY INST
Priority date: 1996-04-03
Filing date: 1996-04-03
Publication date: 1998-05-13
Anticipated expiration: 2006-04-03

Abstract

The utility model relates to a piezoelectric acoustic transducer which is used for wells and mines containing liquids and pipelines, particularly for sensing transducing devices for dredging oil layers in petroleum production wells. The piezoelectric acoustic transducer is composed of an upper contact part, a sounding body part and a lower contact part. Silicone oil is full filled into the sounding body, the outer part of the sounding body is provided with rigid outer sleeve, and connecting positions with the upper contact part and the lower contact part are sealed by O-shaped rings. The lower contact part is provided with a pressure balancing device which is formed by that a piston and a pressure spring are installed in a cylinder, and a longitudinal through hole which is communicated with an axial through hole is arranged on a guiding head. When the pressure of ambient media is large or the temperature of the silicone oil rises to make the silicone oil expand, through the buffering action of the elastic force of the pressure spring and the movement of the piston and the, the inner pressure and the outer pressure of the transducer are kept balanced to ensure that an outer casing tube and a piezoelectric tube are not damaged.

Description

The piezoelectric type acoustic wave transducer

The utility model belongs to the transducing devices that a kind of applied acoustics principle is made, and is applicable to contain the defeated logical oil reservoir of liquid Jing Kuang, pipeline, particularly petroleum well.

The applicant had once proposed a kind of petroleum well piezoelectric type acoustic wave transducer in No. 89212736.8 utility model patents.It is by top connection, and three essential parts of sounding body and lower contact are formed.The sounding body overcoat is the fluorubber sleeve pipe, fills methyl-silicone oil in the sleeve pipe.Because there is intensity difference in the fluorubber sleeve pipe, the shortcoming that the joint external seal is bad influences the result of use and the life-span of transducer.

The purpose of this utility model is exactly in order to overcome the deficiency of prior art, to have proposed a kind of sounding body overcoat intensity height that makes, good airproof performance, and functional performance is better, the piezoelectric type acoustic wave transducer of better effects if.

For realizing the utility model purpose, the technical scheme of employing is to change the rigid material overcoat with softer fluorubber sleeve pipe into as overcoat originally, and seals with O type ring in the junction with top connection and lower contact part.This improvement has improved the intensity of sounding body overcoat greatly, and the sealing performance of joint.

For making the utility model performance better, steady operation under the bigger situation of temperature elevated pressures particularly, the utility model has increased pressure equaliser in the piezoelectric type acoustic wave transducer.Its advantage is an external and internal pressure unanimity when both having guaranteed that transducer uses, and unlikely because pressure medium increases the rigidity overcoat is damaged; Can make the piezoelectric ceramic tube inside and outside wall uniform-compression that takes place in the body again, play a good protection; Also can play regulating action simultaneously, make it be unlikely the bad rigidity overcoat that expands the methyl-silicone oil expanded by heating.

Figure is a structure chart of the present utility model.

Below in conjunction with drawings and Examples in detail the utility model is described in detail.

The utility model is mainly by top connection (1), sounding body (2) with comprise that the lower splice component of lower contact (3), cylinder barrel (4) and guide head (5) forms.The structure of top connection part can be identical with No. 89212736.8 utility model patents.Sounding body part is by the fixing support (8) of piezoelectric ceramic tube (7) of internal support axle (6), some supportings, and outer tube (9) formation.There is locking nut (10) at support (8) two ends respectively with support (8) and internal support axle (6) positioning and fixing.Outer tube of the present utility model (9) adopts transaudient coupling effect good, corrosion resistant stiffening member, for example gapless stainless steel tube.In order not influence entrant sound efficient, generally adopt light-wall pipe.The cavity that reaches support (8) in the outer tube (9) all is full of silicone oil (11).Outer tube (9) seals with O type ring (12) with the junction, two ends of top connection (1), lower contact (3), to prevent that silicone oil from leaking and extraneous medium infiltrates.With holding screw (13) and internal support axle (6) location.The two ends of internal support axle (6) can be shut, but also the fitting tight part in case the silicone oil seepage.

The lower contact of lower splice component (3), cylinder barrel (4) and the coaxial mutual socket of guide head (5) communicate, and are communicated with so that silicone oil flows by the hole (14) on the sounding body internal support axle (6).Lower contact (3) seals in case silicone oil leaks with O type ring (15) with cylinder barrel (4) joint.Pressure equaliser of the present utility model just is installed in the lower contact part.Pressure equaliser comprises piston (16) and the stage clip (17) that is contained in the cylinder barrel (4), and tongue wall beyond the Great Wall can fluted (18), is embedded in sealing ring to improve sealing at groove, makes the unlikely leakage of silicone oil.Piston head and stage clip Elastic Contact, stage clip can stretch in the guide head (5) and its end face Elastic Contact, and communicate with longitudinal hole (20) by the axially extending bore (19) in the guide head (5).For preventing that foreign material enter the cavity of lower splice component in the outer medium, in guide head (5), a screen pack (22) is fixed in the axially extending bore (19) with screwed pipe (21).Behind the working pressure bascule, when ambient pressure was high, medium entered cylinder barrel by axially extending bore, and its pressure promotes piston and moves, because the cushioning effect of piston motion and stage clip elastic force can make the transducer external and internal pressure reach balance; When the silicone oil temperature rising volume expansion in the transducer, force piston to move down, under the cushioning effect of piston motion and stage clip elastic force, the transducer external and internal pressure can keep balance equally, and is unlikely because bloated bad outer tube of silicone oil expansion and damage piezoelectric ceramic tube.

Claims

1. piezoelectric type acoustic wave transducer, partly connect to form by top connection part, sounding body part and lower contact, be full of silicone oil in the sounding body, there is outer tube the outside, it is characterized in that outer tube (9) adopts the rigid material pipe, outer tube (9) seals with O type ring (12) with the junction at top connection (1) and lower contact (3) two ends.

2. acoustic wave transducer as claimed in claim 1 is characterized in that having pressure equaliser, and it includes piston (16) and the stage clip (17) that is contained in the cylinder barrel (4), and is connected with longitudinal hole (20) by the axially extending bore (19) in the guide head (5).

3. acoustic wave transducer as claimed in claim 2 is characterized in that piston outer wall has the groove (18) that embeds joint ring.

4. acoustic wave transducer as claimed in claim 3 is characterized in that being provided with screen pack (22) in guide head (5).