CN101625337B - Circumferential wave guide energy converter with adjustable incident angle - Google Patents

Circumferential wave guide energy converter with adjustable incident angle Download PDF

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Publication number
CN101625337B
CN101625337B CN2009100415780A CN200910041578A CN101625337B CN 101625337 B CN101625337 B CN 101625337B CN 2009100415780 A CN2009100415780 A CN 2009100415780A CN 200910041578 A CN200910041578 A CN 200910041578A CN 101625337 B CN101625337 B CN 101625337B
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China
Prior art keywords
block
energy converter
piece
piezoelectric chip
incident angle
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CN2009100415780A
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Chinese (zh)
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CN101625337A (en
Inventor
张春雷
马庆增
胡平
卢方龙
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广东电网公司电力科学研究院
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Priority to CN2009100415780A priority Critical patent/CN101625337B/en
Publication of CN101625337A publication Critical patent/CN101625337A/en
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Publication of CN101625337B publication Critical patent/CN101625337B/en

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Abstract

The present invention discloses a circumferential wave guide energy converter with an adjustable incident angle for realizing ultrasonic testing of the whole tube of the each small diameter tube of various types of power station boilers on a smaller contact surface. A piezoelectric wafer of the energy converter is stuck and fixed on a slide block; the slide block can move along the arc surface of a transparent wedge block; the transparent wedge block matches with a match block, so that ultrasonic wave rectilinearly propagates in a organic glass before propagating into a tube to be tested, and incidence point thereof is just at the symmetric point of the arc inner surface of the match block. By adjusting the incident angle of the ultrasonic wave, the incident ultrasonic wave is refracted on the outer interface of the small tube to be tested, regular polygonal ultrasonic wave preparation channel is formed in a metal medium, and under the state of no defect, the ultrasonic wave returns to the energy converter at the incidence point by the means that the perimeter of the regular polygon is taken as a single beam path, and is received. The energy converter solves the technical problem that a heating surface tube panel can not be completely tested with the ultrasonic technology on the spot.

Description

The circumferential wave guide energy converter that a kind of incident angle is adjustable
Technical field
The present invention relates to a kind of nondestructive examination transducer, especially relate to the adjustable circumferential ultrasonic guided wave energy exchange device of a kind of incident angle, on less surface of contact, realize ultrasound examination whole pipe of plurality of specifications station boiler small diameter tube.
Background technology
The composition structure of existing ultrasonic guided wave energy exchange device mainly contains 2 kinds: (1) is a kind of to be the single transducer structure.Comprise piezoelectric chip and cylindrical organic glass sound voussoir, its principle of work is provided with the probe supersonic guide-wave reflection circle conical surface for the end at cylindrical organic glass sound voussoir, the suitable external diameter of internal diameter of employing and tested pipeline, and its essence is detection with transversal waves.Each transducer can only be applicable to that the pipe of a certain fixedly specification detects, and bigger detection blind area is arranged.(2) a kind of is transducer array, adopts a plurality of transducers to form array.Its advantage is to launch the supersonic guide-wave of various modes, but only is applicable to the detection of the pressure pipeline that caliber is bigger.
Heating surface pipes such as economizer, water-cooling wall, superheater and reheater (being called for short " four main tubes of boiler "), be the very important high-temperature bearing parts of station boiler, the leakage that the improper stoppage in transit reason of unit about 70% is a four main tubes of boiler, therefore heating surface being tested is the important means that power industry guarantees the unit safety reliability service.The characteristics of heating surface tube are the path thin-walleds, when forming tube panel, because its tube pitch is very little, its area that can place detecting sensor is very little, sonac can only move at 1/3 circumference, therefore utilizes common sonac to be difficult to the heating surface tube panel is comprehensively checked in the erecting stage.
Summary of the invention
Purpose of the present invention, just provide a kind of incident angle adjustable, on less surface of contact, realize circumferential ultrasonic guided wave energy exchange device to whole pipe nondestructive examination of plurality of specifications path thin walled tube.
For achieving the above object, the circumferential wave guide energy converter that incident angle of the present invention is adjustable is characterized in that comprising:
One piezoelectric chip slipping block, by the piezoelectric chip upper surface that is connected to the transducer signal line be bonded with the backing damping block, lower surface is bonded with plexiglass block and constitutes, the lower surface of plexiglass block is the indent face of cylinder, the backing damping block is provided with knob or handle;
One entrant sound is carved piece, and upper surface is the face of cylinder that adapts to the indent face of cylinder of piezoelectric chip slipping block lower surface, upper surface vertically subdivision half be shiny surface, second half is provided with sound trap;
One match block, it is releasable connection that its end face and entrant sound are carved the piece bottom surface, the bottom surface is the face of cylinder that cooperates with detected outer tube surface, the cylinder upper surface axis that this cylinder bottom surface and entrant sound are carved piece in the same way, and its peak is the center of circle that entrant sound is carved the piece cylinder, guarantee ultrasound wave before importing tested pipe into, in organic glass, be rectilinear propagation, and its incidence point just in time drops on the peak of match block circular arc inside surface;
One shell has elongated hole on the shell face, allows the knob of piezoelectric chip slipping block or handle stretch out, and conveniently moves the piezoelectric chip slipping block with hand and moves along elongated hole.
On the basis of the above, the present invention can also do further to improve and improve:
Be provided with face of cylinder pad, cushion from top to bottom on the described piezoelectric chip slipping block backing damping block; Making the piezoelectric chip slipping block can overlay in entrant sound carves on the piece upper surface.
Perforate on the described shell shell face is the horizontal long arc-shaped holes on end face; Described backing damping block is provided with handle and passes the horizontal slotted hole of shell, can only carve on the piece shiny surface in entrant sound when making the slippage of piezoelectric chip slipping block and move.
Two relative side is provided with knob and passes the horizontal slotted hole of shell on the described backing damping block.
Described sound trap is surperficial indention shape or zigzag fashion and adds the attaching acoustic absorbant.
Described entrant sound carves piece and match block can be made of one.
Described shell is made up of interior cover, last cover and clamping swivel nut.
Beneficial effect: because piezoelectric chip slipping block of the present invention can slide on entrant sound is carved the periphery of piece, entrant sound is carved piece and is cooperated with match block, make ultrasound wave before importing tested pipe into, in organic glass, be rectilinear propagation, and its incidence point just in time drops on the peak of match block circular arc inside surface, and match block lower surface shape is corresponding with the periphery cambered surface of tested pipe.By regulating the ultrasound wave incident angle, make the incident ultrasound wave on the outer boundary of measured small diameter tube (power station boiler four-tube is main), produce refraction, in metal medium, form the ultrasonic propagation passage of regular polygon, under trouble-free state, ultrasound wave is that the monophone journey returns transducer at incidence point with the regular polygon girth, and is received.In actual the use, only need this transducer to move about 1/5 or 1/4 girth, can realize the whole circumferential quality testing of heating surface at outer tube surface.The invention solves and to adopt ultrasonic technology the heating surface tube panel to be carried out the technical barrier of complete detection in the erecting stage.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is a design concept synoptic diagram of the present invention;
Fig. 2 is the stereoscopic synoptic diagram of the embodiment of the invention one;
Fig. 3 is the three-dimensional cross-sectional schematic of embodiment one shown in Figure 2;
Fig. 4 is the cross-sectional schematic of embodiment one shown in Figure 2;
Fig. 5 is that the entrant sound of embodiment one shown in Figure 2 is carved the piece schematic top plan view;
Fig. 6 is that the master of the embodiment of the invention two looks synoptic diagram;
Fig. 7 is the cross-sectional schematic of embodiment two shown in Figure 6;
Fig. 8 is the schematic top plan view of embodiment two shown in Figure 6;
Fig. 9 is the piezoelectric chip slipping block enlarged diagram of embodiment two shown in Figure 6.
Among the figure: 1-piezoelectric chip slipping block, 102-piezoelectric chip, 103-backing damping block, the 104-plexiglass block, 105-handle or knob, 106-cushion, 107-cylinder pad, the 2-entrant sound is carved piece, 201-sound trap, the 3-match block, 301-web member, 4-shell, cover in the horizontal slotted hole of 401-, 402-, the last cover of 403-, 404-clamps swivel nut, the tested steel pipe of 5-.
Embodiment
Figure 1 shows that design concept of the present invention, utilize the organic glass of having piezoelectric chip in the transducer to carve piece, in wide range, regulate the ultrasound wave incident angle, and with the acting in conjunction of match block, make the incident ultrasound wave on the outer boundary of measured small diameter tube (power station boiler four-tube is main), produce refraction, in metal medium, form the ultrasonic propagation passage of regular polygon, under trouble-free state, ultrasound wave is that the monophone journey returns transducer at incidence point with the regular polygon girth, and is received.
Can see that from Fig. 2 to Fig. 5 the circumferential wave guide energy converter embodiment one that incident angle of the present invention is adjustable comprises:
One piezoelectric chip slipping block 1, by piezoelectric chip 102 upper surfaces that are connected to the transducer signal line be bonded with backing damping block 103, lower surface is bonded with plexiglass block 104 and constitutes, the lower surface of plexiglass block 104 is the indent face of cylinder, and the backing damping block is provided with handle 105.
One entrant sound is carved piece 2, upper surface is the face of cylinder that adapts to the indent face of cylinder of piezoelectric chip slipping block lower surface, upper surface vertically subdivision half be shiny surface, second half is provided with sound trap 201, referring to Fig. 5, the sound trap of present embodiment is surperficial indention shape.
One match block 3, the match block 3 and the entrant sound of present embodiment are carved piece 2 and have been made one, match block 3 bottom surfaces are the face of cylinder that cooperates with detected pipe 5 outside surfaces, this bottom surface and entrant sound are carved the piece upper surface and are the out-of-alignment face of cylinder in the same way, and the diaxon axial line distance equals detected pipe radius, also promptly this bottom surface and entrant sound are carved the piece upper surface in the same way, and its peak is the center of circle that entrant sound is carved the piece cylinder, as shown in Figure 4, so just can guarantee that ultrasound wave is before importing tested pipe into, in organic glass, be rectilinear propagation, and its incidence point just in time drops on the peak on the indent face of cylinder of match block 3.
One shell 4, by cover 402 in columniform, on overlap 403 and clamp swivel nut 404 and forms, interior cover, go up cover and be installed in the match block 3 of having made one and carve outside the piece 2 with entrant sound, in overlapping in last cover is clipped in and upward overlapping, on overlap and have horizontal long arc-shaped holes 401 on the end face.
On piezoelectric chip slipping block backing damping block, be provided with face of cylinder pad 107, cushion 106 from top to bottom; Handle 105 passes face of cylinder pad 107, cushion 106, makes the piezoelectric chip slipping block can overlay in entrant sound and carves on the piece upper surface.
Handle 105 on the backing damping block passes the horizontal slotted hole of shell at last, makes can only to carve on the piece shiny surface in entrant sound when moving the piezoelectric chip slipping block with hand laterally to move, and regulates incident angle.
Fig. 6 is with the precedent difference to embodiments of the invention two shown in Figure 9: shell 4 adds the end face that seal front and back for cylindrical shell, and the perforate on the shell face is out the corresponding laterally long arc-shaped holes in both ends of the surface; Two relative side is provided with knob and passes the horizontal slotted hole of shell on the backing damping block.
Entrant sound is carved piece, and half is shiny surface, second half is provided with sound trap, purpose is to prevent that ultrasound wave part acoustic energy is after entrant sound is carved piece and match block border (incidence point) last reflection, repeatedly reflection in organic glass, turning back to wafer is accepted, strengthen exomonental width, form fixing interference noise.The sound trap adopts zigzag fashion, can also attach methods such as acoustic absorbant on serrated face, guarantees to sponge this part acoustic energy by the sound trap;
The radius on the organic glass lower surface indent face of cylinder must be carved the consistent of piece with entrant sound, in application, can be by regulating knob, and the cambered surface that makes piezoelectric chip slipping block 1 carve piece 2 in entrant sound is slided, thereby regulates the incident angle of ultrasonic beam.
The face of cylinder of match block 3 is carved piece with entrant sound and is cooperated, the sound pulse that guarantees the piezoelectric chip emission arrives the peak of the incidence point of tested pipe at the match block intrados, also guarantees that ultrasound wave is always a fixed value (entrant sound is carved the arc radius of piece) at the sound path that match block 3 and entrant sound are carved in the piece before the tested pipe of incident when incident angle is regulated simultaneously.
Select suitable piezoelectric, can guarantee the high sensitivity and the broadband of transducer, choose the burst pulse that the close preceding matching layer of suitable backing and acoustic impedance guarantees transducer, to obtain high resolution.
The frequency of transducer is decided by the thickness of wafer, in order to make the transducer of suitable frequency, must adjust the thickness of wafer.To suitable thickness, it is according to being that to make piezoelectric chip thickness be half-wavelength the thick wafer hand lapping of low frequency.Grind and plate silver layer on the two sides of wafer again after suitable and make electrode.
The acoustic impedance of backing damping block has crucial effects to the bandwidth and the pulse width of transducer.Suppose that thickness of adhibited layer is zero, when the acoustic impedance of piezoelectric chip and backing acoustic impedance equated, the backward radiation of piezoelectric chip all propagated into backing, and backing all absorbs the backward radiation of wafer, and this moment, the transponder pulse of transducer was the narrowest.
When backing is made, after tungsten powder and epoxy resin prepared according to a certain percentage, under noncondensing situation, be poured into chlamydate chip back surface.During cast, at the contact layer of backing and wafer bubble can not be arranged, heating goes out bubble train while pouring into a mould.Behind the casting complete, the semi-manufacture probe is placed in the baking oven 80 ℃ of bakings of constant temperature 3-4 hour.
Transducer adopts adhering with epoxy resin, because the acoustic impedance of epoxy resin is very low, differs greatly with the acoustic impedance of wafer, diaphragm and backing, and its thickness has a significant impact the performance of transducer.When thickness of adhibited layer reached 1/400 left and right sides of wavelength, its influence roughly can be ignored.
Entrant sound is carved piece and is cooperated with match block, guarantees ultrasound wave before importing tested workpiece into, be rectilinear propagation in organic glass, and its incidence point just in time drops on the peak of match block circular arc inside surface.
Match block mainly designs and produces according to the curvature of detected pipe, the non-single structure of match block, can be designed to the structure that is convenient for changing of series according to ideal format heating surface (various small diameter tubes such as water-cooling wall, economizer, superheater, the reheater) specification (Φ 51-Φ 63.5) of power station pipe.
The match block one side can fit like a glove with detected pipe cambered surface; One side can mount and dismount easily with the saturating layer of transducer sound in addition.
The acoustic impedance requirement.Adopt the organic glass identical with the transducer acoustic window material.
The match block both sides are provided with bolt fastening structure, and it cooperates with bolt arrangement on the transducer metal shell, makes things convenient for its dismounting in application.

Claims (6)

1. circumferential wave guide energy converter that incident angle is adjustable is characterized in that comprising:
One piezoelectric chip slipping block, by the piezoelectric chip upper surface that is connected to the transducer signal line be bonded with the backing damping block, lower surface is bonded with plexiglass block and constitutes, the lower surface of plexiglass block is the indent face of cylinder, the backing damping block is provided with knob or handle;
One entrant sound is carved piece, and upper surface is the face of cylinder that adapts to the indent face of cylinder of piezoelectric chip slipping block lower surface, upper surface vertically subdivision half be shiny surface, second half is provided with sound trap;
One match block, it is releasable connection that its end face and entrant sound are carved the piece bottom surface, the bottom surface is the face of cylinder that cooperates with detected outer tube surface, this bottom surface and entrant sound are carved the piece upper surface in the same way, and its peak is the center of circle that entrant sound is carved the piece cylinder, guarantee ultrasound wave before importing tested pipe into, in organic glass, be rectilinear propagation, and its incidence point just in time drops on the peak of match block circular arc inside surface;
Described plexiglass block, entrant sound carve piece and match block adopts the homogeneity organic glass;
One shell has elongated hole on the shell face, allows the knob of piezoelectric chip slipping block or handle stretch out, and conveniently moves the piezoelectric chip slipping block with hand and moves along elongated hole.
2. the adjustable circumferential wave guide energy converter of incident angle according to claim 1 is characterized in that: be provided with face of cylinder pad, cushion from top to bottom on the described piezoelectric chip slipping block backing damping block; Making the piezoelectric chip slipping block can overlay in entrant sound carves on the piece upper surface.
3. the adjustable circumferential wave guide energy converter of incident angle according to claim 2 is characterized in that: the perforate on the described shell shell face is the horizontal long arc-shaped holes on end face; Described backing damping block is provided with handle and passes the horizontal slotted hole of shell, can only carve on the piece shiny surface in entrant sound when making the slippage of piezoelectric chip slipping block and move.
4. the adjustable circumferential wave guide energy converter of incident angle according to claim 2 is characterized in that: two relative side is provided with knob and passes the horizontal slotted hole of shell on the described backing damping block.
5. according to claim 3 or the adjustable circumferential wave guide energy converter of 4 described incident angles, it is characterized in that: described sound trap is surperficial indention shape or zigzag fashion and adds the attaching acoustic absorbant.
6. the adjustable circumferential wave guide energy converter of incident angle according to claim 4 is characterized in that: described shell is made up of interior cover, last cover and clamping swivel nut.
CN2009100415780A 2009-07-31 2009-07-31 Circumferential wave guide energy converter with adjustable incident angle CN101625337B (en)

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CN101625337B true CN101625337B (en) 2011-07-20

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US8746070B2 (en) 2011-04-08 2014-06-10 Tejas Testing & Inspection, Inc. Phased array ultrasonic examination system and method
CN102608216B (en) * 2012-04-13 2014-03-12 中国计量学院 Ultrasonic nondestructive testing wedge block
CN102721743A (en) * 2012-06-26 2012-10-10 衡阳华菱钢管有限公司 Ultrasonic flaw detection method for detecting defects of longitudinal inner walls of thin-walled steel tubes
CN103674134B (en) * 2013-11-30 2016-06-22 国家电网公司 A kind of ultrasound transducer apparatus
CN103675106A (en) * 2013-12-16 2014-03-26 哈尔滨工业大学 Local immersion type phased-array linear-array probe wedge block
CN103698405A (en) * 2013-12-19 2014-04-02 国家电网公司 Ultrasonic imaging detection phased array transduction device for blade fir-type root of turbine
CN103691654B (en) * 2013-12-24 2016-03-23 中国科学院上海硅酸盐研究所 low-frequency narrow-pulse ultrasonic transducer
CN103837227A (en) * 2014-03-21 2014-06-04 国家电网公司 Piezoelectric sensor
CN103954692A (en) * 2014-05-06 2014-07-30 常州市常超电子研究所有限公司 Reflection type adjustable ultrasonic probe
CN104034806B (en) * 2014-05-23 2019-11-22 南昌航空大学 Method based on PZT (piezoelectric transducer) side loaded F mode Guided waves electric power tower stay rod defect

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454350A (en) * 2013-09-13 2013-12-18 中国石油大学(华东) Waveguide rod fixing device for acoustic emission inspection of pipeline
CN103454350B (en) * 2013-09-13 2015-06-24 中国石油大学(华东) Waveguide rod fixing device for acoustic emission inspection of pipeline

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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8

Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD.

Address before: 510600 No. 73 Meihua Road, Guangzhou, Guangdong, Yuexiu District

Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation

Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8

Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD.

Address before: 510600 No. 73 Meihua Road, Guangzhou, Guangdong, Yuexiu District

Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation

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Effective date of registration: 20171124

Address after: 510655, No. fifth, No. 146-150, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou

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Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8

Patentee before: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD.

Effective date of registration: 20171124

Address after: 510655, No. fifth, No. 146-150, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou

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