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WO2018136044A1 - Transducteur ultrasonore et son procédé d'assemblage - Google Patents

Transducteur ultrasonore et son procédé d'assemblage Download PDF

Info

Publication number
WO2018136044A1
WO2018136044A1 PCT/US2017/013900 US2017013900W WO2018136044A1 WO 2018136044 A1 WO2018136044 A1 WO 2018136044A1 US 2017013900 W US2017013900 W US 2017013900W WO 2018136044 A1 WO2018136044 A1 WO 2018136044A1
Authority
WO
WIPO (PCT)
Prior art keywords
components
crystal
ultrasonic transducer
loading
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2017/013900
Other languages
English (en)
Inventor
Daniel Roehrig
Robert Schaefer
Joespeh WUTHIJAROEN
Michael Keenan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to PCT/US2017/013900 priority Critical patent/WO2018136044A1/fr
Publication of WO2018136044A1 publication Critical patent/WO2018136044A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts

Definitions

  • aspects of the present invention generally relate to a transducer such as an ultrasonic transducer and more specifically relate to assembling components of an ultrasonic transducer.
  • Ultrasonic flow meters are used for the measurement of fluid flow in day-today applications involving both liquids and gases. Ultrasonic flow meters have the advantage that they have no moving parts that can fail, introduce very little pressure drop, and offer a high turndown ratio.
  • Ultrasonic flow meters use two transducers for transmitting and receiving signals in opposite directions (i.e., upstream and downstream) to derive the transit-time difference used to determine the fluid flow velocity.
  • Main applications include the measurement of volume flow within the general, petrochemical and chemical industries, power engineering and water and waste water.
  • Ultrasonic transit-time transducers installed in hazardous area locations often require electrical isolation of a piezo-ceramic crystal's front face electrode, while also maintaining efficient and reliable acoustic coupling to a metallic window in contact with the process fluid.
  • Grease is commonly used for the acoustic coupling of these crystals, making it difficult to ensure the required 500 VAC electrical isolation.
  • the dimensions of the gap between the piezo element and the metallic surface must be well controlled.
  • the edges of the piezo ceramic element must also be electrically isolated from any other conductive surfaces.
  • aspects of the present invention relate to a method of assembling components of an ultrasonic transducer.
  • a dry film adhesive or epoxy has been selected to achieve consistent bond line thickness.
  • a pre-cured load on a crystal relative to an epoxy bond is carefully controlled.
  • an isolation sleeve surrounding the crystal is subsequently bonded with a lighter load.
  • Wave spring washers are used to form two independent spring stacks, one for loading the crystal and a second for loading the isolation sleeve. The method first loads the crystal, excluding air from that bond, and then applies the final loading to the isolation sleeve.
  • Use of wave spring washers eliminates the torsional stresses.
  • a method of assembling components of an ultrasonic transducer comprises installing a dry film adhesive in a transducer body of the ultrasonic transducer, installing a plurality of crystal components, including a crystal and an isolation sleeve, on the dry film adhesive in the transducer body, installing a plurality of crystal loading components on the plurality of crystal components in the transducer body, installing a plurality of sleeve loading components on the plurality of crystal loading components in the transducer body and installing a retaining ring on the plurality of sleeve loading components in the transducer body.
  • the method further comprises loading the dry film adhesive, the plurality of crystal components, the plurality of crystal loading components and the plurality of sleeve loading components to form an assembly therefrom by subjecting all the components of the ultrasonic transducer to a non-torsional spring force due to compression of springs caused by installing of the retaining ring such that the assembly is locked in place.
  • an ultrasonic transducer comprises a transducer body, a dry film adhesive disposed in the transducer body and a plurality of crystal components including a crystal and an isolation sleeve disposed on the dry film adhesive.
  • the method of assembling components of the ultrasonic transducer comprises the steps of claim 1.
  • FIG. 1 illustrates an exploded view of an assembly of all the components of an ultrasonic transducer in accordance with an exemplary embodiment of the present invention.
  • FIG. 2 illustrates a cross-sectional view of the assembly of all the components of the ultrasonic transducer at a line A-A in FIG. 1 in accordance with an exemplary embodiment of the present invention.
  • FIG. 3 illustrates a fully compressed view of the assembly of all the components of the ultrasonic transducer of FIG. 1 in accordance with an exemplary embodiment of the present invention.
  • FIG. 4 illustrates a cross-sectional view of the fully compressed assembly of all the components of the ultrasonic transducer of FIG. 3 at a line B-B in FIG. 3 in accordance with an exemplary embodiment of the present invention.
  • FIG. 5 illustrates a flow chart of a method of assembling components of an ultrasonic transducer according to an exemplary embodiment of the present invention.
  • FIG. 6 illustrates a flow chart of a method of assembling options of an ultrasonic transducer according to an exemplary embodiment of the present invention.
  • FIG. 7 illustrates an in-line meter body in which the ultrasonic transducer 7 of FIG. 1 is installed in accordance with an exemplary embodiment of the present invention.
  • FIG. 8 illustrates a cross-sectional view of the in-line meter body of FIG. 7 at a line C-C in accordance with an exemplary embodiment of the present invention.
  • FIG. 1 represents an exploded view of an assembly 5 of all the components of an ultrasonic transducer 7.
  • the assembly 5 is compressed by an arbor tool 10 to form the ultrasonic transducer 7.
  • the arbor tool 10 has a shaft or an arbor via which it is mounted on the assembly 5.
  • the arbor tool 10 provides a tool component that assembles the components of the assembly 5 together to form the ultrasonic transducer 7.
  • FIG. 2 it illustrates a cross-sectional view of the assembly 5 of all the components of the ultrasonic transducer 7 at a line A-A in FIG. 1 in accordance with an exemplary embodiment of the present invention.
  • the assembly 5 includes a transducer body 212 of the ultrasonic transducer 7.
  • the assembly 5 further includes a dry film adhesive 215, a plurality of crystal components 217, a plurality of crystal loading components 220, a plurality of sleeve loading components 222, and a retaining ring 225.
  • the dry film adhesive 215 is a pre-cut dry film epoxy.
  • the plurality of crystal components 217 includes a crystal isolation sleeve 230, a crystal 232 and a crystal loading ring 235.
  • the crystal 232 is a piezo-ceramic crystal element having a front face electrode such that the front face electrode is a component of the ultrasonic transducer 7 that requires electrical isolation.
  • the assembly provides this component of the ultrasonic transducer 7 a desired level of the electrical isolation.
  • the assembly 5 of the ultrasonic transducer 7 provides an efficient and reliable acoustic coupling of the piezo-ceramic crystal element to a metallic window in contact with a process fluid in an in-line meter body.
  • This ultrasonic transducer 7 may be a transducer suitable for installation in a hazardous area location.
  • the plurality of crystal loading components 220 includes crystal springs 240 and a plunger 242.
  • the plurality of sleeve loading components 222 includes sleeve springs 245 and a washer 250.
  • FIG. 3 it illustrates a fully compressed view of the assembly 5 of all the components of the ultrasonic transducer 7 of FIG. 2 in accordance with an exemplary embodiment of the present invention.
  • FIG. 4 illustrates a cross-sectional view of the fully compressed assembly 5 of all the components of the ultrasonic transducer 7 of FIG. 3 at a line B-B in FIG. 3 in accordance with an exemplary embodiment of the present invention.
  • the transducer body 212 includes a groove 400. When fully compressed, the retaining ring 225 snaps into the groove 400. This locks the assembly 5 in place.
  • FIG. 5 it illustrates a flow chart of a method 500 of assembling components of the ultrasonic transducer 7 according to an exemplary embodiment of the present invention.
  • the method 500 in step 505, includes installing the dry film adhesive 215 in the transducer body 212 of the ultrasonic transducer 7.
  • the method 500, in step 510 further includes installing the plurality of crystal components 217, including the crystal 232 and the isolation sleeve 230, on the dry film adhesive 215 in the transducer body 212.
  • the method 500, in step 515 further includes installing the plurality of crystal loading components 220 on the plurality of crystal components 217 in the transducer body 212.
  • the method 500, in step 520 further includes installing the plurality of sleeve loading components 222 on the plurality of crystal loading components 220 in the transducer body 212.
  • two sets of spring stacks are selected to maintain an optimum pressure on the dry film adhesive 215. Both under the crystal 232 (large area) and under the isolation sleeve 230 (small area).
  • the method 500 in step 525, further includes installing the retaining ring 225 on the plurality of sleeve loading components 222 in the transducer body 212.
  • the retaining ring 225 secures both the sleeve loading components 222 and the plurality of crystal loading components 220.
  • the method 500 further includes compressing the retaining ring 225 with the arbor tool 100 to snap the retaining ring 225 into the groove 400 situated in an inner hollow side of a tubular shape of the transducer body 212.
  • the arbor tool 10 After loading the retaining ring 225, the arbor tool 10 is used such that the crystal 232 is loaded to an optimum pressure by the arbor tool 10 before any pressure is applied to the isolation sleeve 230. All components are loose until subjected to spring forces to lock in the assembly 5. The retaining ring 225 captures the assembly 5 in place.
  • the spring selection is critical in this assembly 5. To avoid a torsional force on the assembly 5 and especially on the dry film adhesive 215 during curing wave washers are selected as they can be easily stacked with flat washers in between.
  • FIG. 6 it illustrates a flow chart of a method 600 of assembling options of the ultrasonic transducer 7 according to an exemplary embodiment of the present invention.
  • the method 600 in step 605, includes a final assembly step. After the final assembly step 605 one has two options.
  • step 610 the method 600 includes removing assembly components to be used in the next assembly.
  • the components of the assembly 5 to be removed are: the arbor tool 10, the retaining ring 225, the plurality of sleeve loading components 222, the plurality of crystal loading components 220 and the crystal loading ring 235.
  • the method 600 includes removing first the retaining ring 225 from the assembly 5 after curing of the dry film adhesive 215, removing thereafter the plurality of sleeve loading components 222 and the plurality of crystal loading components 220 and removing last the crystal loading ring 235 from the assembly 5.
  • the loading components may be attached to a fixture that would be clamped in place until the curing is done, at which point, the clamp would be released and all the loading components would come out, to be used on the next set of parts. So there is a possibility of using a fixture to hold down the assembly 5 during curing and removing the loading components after the assembly 5 had cured.
  • the retaining ring 225 is replaced by the clamping element of the fixture. Therefore, one alternate assembly method is clamping in place through cure in place of holding with the retaining ring 225.
  • step 615 the method 600 includes leaving all the components in the assembly 5 as is. That is, leaving all the components of the ultrasonic transducer 7 in place as is as a permanent part of the assembly 5.
  • the ultrasonic transducer 7 may be used for flow rate measurement in conduits and channels with large cross section.
  • the ultrasonic transducer 7 has many advantages e.g. no pressure loss, high accuracy and the possibility to be installed on existing conduits and channels.
  • This type of flow meter is based on the principle that the ultrasonic pulse traveling along an acoustic path is altered by the fluid velocity. An ultrasonic pulse propagates at a slower speed in the upstream direction than it does in the downstream direction, such that the time difference is proportional to the velocity of flow inside the measurement section.
  • FIG. 7 illustrates an in-line meter body 700 in which an ultrasonic transit time transducer 705 of FIG. 1 is installed in accordance with an exemplary embodiment of the present invention.
  • the in-line meter body 700 is an in-line measuring element which is used to measure the volume flow of liquids or gases. It can be used with both conductive and non-conductive liquids.
  • a signal is sent directly and without reflection, between the transmitting and receiving transducers.
  • the advantage gained sending signals from point to point is an extremely good signal strength for the signal processing.
  • a sound wave traveling in the same direction as the liquid flow arrives at a point B from a point A in a shorter time than the sound wave traveling against the direction of flow (from point B to A). The difference in sound transit time indicates the flow velocity in the pipe.
  • FIG. 8 it illustrates a cross-sectional view of the in-line meter body 700 of FIG. 7 at a line C-C in accordance with an exemplary embodiment of the present invention.
  • the in-line meter body 700 two ultrasonic transducers 705(1-2) of four ultrasonic transducers 705(1-4) are placed at an angle in relation to a pipe axis.
  • This may be an in-line (non-refractive) flowmeter.
  • the measuring principle of the in-line (non- refractive) flowmeter offers the advantage that it is independent of variations in the actual sound velocity of the liquid, i.e. independent of the temperature.
  • fluid flows through the meter body may have a tendency to swirl and/or exhibit an asymmetrical flow profile. Therefore two or more tracks may be needed to provide the required flow accuracy.
  • a multi-track system offers reduced sensitivity to upstream obstruction like bends, pumps or valves and improved security in the measurements as the meter continues to measure even if one track stops working.
  • in-line meter body While particular embodiments are described in terms of an in-line meter body, the techniques described herein are not limited to in-line meter body but can also be used in other configurations, such as open channel flow meters.
  • any examples or illustrations given herein are not to be regarded in any way as restrictions on, limits to, or express definitions of, any term or terms with which they are utilized. Instead, these examples or illustrations are to be regarded as being described with respect to one particular embodiment and as illustrative only. Those of ordinary skill in the art will appreciate that any term or terms with which these examples or illustrations are utilized will encompass other embodiments which may or may not be given therewith or elsewhere in the specification and all such embodiments are intended to be included within the scope of that term or terms.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Transducteur ultrasonore et procédé d'assemblage de composants du transducteur ultrasonore. Le procédé comprend l'installation d'un adhésif à film sec, d'une pluralité de composants de cristal, d'une pluralité de composants de chargement de cristal, d'une pluralité de composants de chargement de manchon dans un corps de transducteur et l'installation d'un anneau de retenue sur la pluralité de composants de chargement de manchon dans le corps de transducteur. Le procédé comprend en outre le chargement de l'adhésif à film sec, de la pluralité de composants de cristal, de la pluralité de composants de chargement de cristal et de la pluralité de composants de chargement de manchon pour former un ensemble à partir de ceux-ci par soumission de tous les composants du transducteur ultrasonore à une force de ressort sans torsion due à la compression de ressorts provoquée par l'installation de la bague de retenue de telle sorte que l'ensemble est bloqué en place.
PCT/US2017/013900 2017-01-18 2017-01-18 Transducteur ultrasonore et son procédé d'assemblage Ceased WO2018136044A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2017/013900 WO2018136044A1 (fr) 2017-01-18 2017-01-18 Transducteur ultrasonore et son procédé d'assemblage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2017/013900 WO2018136044A1 (fr) 2017-01-18 2017-01-18 Transducteur ultrasonore et son procédé d'assemblage

Publications (1)

Publication Number Publication Date
WO2018136044A1 true WO2018136044A1 (fr) 2018-07-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111318440A (zh) * 2020-03-02 2020-06-23 北京宏伟超达科技股份有限公司 一种新型材质超音速换能器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925692A (en) * 1974-06-13 1975-12-09 Westinghouse Electric Corp Replaceable element ultrasonic flowmeter transducer
US4240004A (en) * 1978-09-20 1980-12-16 Westinghouse Electric Corp. Ultrasonic transducer with chemical-setting inorganic cement backing for operation at high temperatures
WO1999010110A1 (fr) * 1997-08-22 1999-03-04 Danfoss A/S Transducteur ultrasonore
US20070007862A1 (en) * 2003-09-18 2007-01-11 Akihisa Adachi Ultrasonic vibrator and ultrasonic flowmeter employing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925692A (en) * 1974-06-13 1975-12-09 Westinghouse Electric Corp Replaceable element ultrasonic flowmeter transducer
US4240004A (en) * 1978-09-20 1980-12-16 Westinghouse Electric Corp. Ultrasonic transducer with chemical-setting inorganic cement backing for operation at high temperatures
WO1999010110A1 (fr) * 1997-08-22 1999-03-04 Danfoss A/S Transducteur ultrasonore
US20070007862A1 (en) * 2003-09-18 2007-01-11 Akihisa Adachi Ultrasonic vibrator and ultrasonic flowmeter employing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111318440A (zh) * 2020-03-02 2020-06-23 北京宏伟超达科技股份有限公司 一种新型材质超音速换能器

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