WO2019024512A1 - Transducteur ultrasonore à faisceau traversant axial combiné permettant la mesure d'un flux de gaz - Google Patents

Transducteur ultrasonore à faisceau traversant axial combiné permettant la mesure d'un flux de gaz Download PDF

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Publication number
WO2019024512A1
WO2019024512A1 PCT/CN2018/079436 CN2018079436W WO2019024512A1 WO 2019024512 A1 WO2019024512 A1 WO 2019024512A1 CN 2018079436 W CN2018079436 W CN 2018079436W WO 2019024512 A1 WO2019024512 A1 WO 2019024512A1
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WO
WIPO (PCT)
Prior art keywords
component
side wall
housing
gas flow
casing
Prior art date
Application number
PCT/CN2018/079436
Other languages
English (en)
Chinese (zh)
Inventor
刘立国
于强
Original Assignee
青岛积成电子股份有限公司
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 青岛积成电子股份有限公司 filed Critical 青岛积成电子股份有限公司
Publication of WO2019024512A1 publication Critical patent/WO2019024512A1/fr

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Classifications

    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus

Definitions

  • the invention relates to an ultrasonic transducer, in particular to a combined axial beam-type ultrasonic transducer for gas flow measurement, belonging to the technical field of ultrasonic sensors.
  • the key component in the ultrasonic gas flow measuring device is the gas medium ultrasonic transducer.
  • the axial-beam ultrasonic transducer of the prior art has a transducer housing including a housing for assembling the transducer core and a connecting portion for connecting to the measuring tube segment, the two parts being a one-piece structure.
  • the ultrasonic transducer of this structure has the defects of high processing difficulty and difficulty in assembly and maintenance.
  • the present invention provides a combined axial beam-type ultrasonic transducer for gas flow measurement that is simple in structure, low in processing difficulty, and easy to assemble and maintain.
  • a combined axial beam-type ultrasonic transducer for gas flow measurement characterized in that it is composed of a component A and a component B, the component A
  • the housing and the transducer core are cylindrical, the rear end of the housing has a boss, and the outer sidewall of the housing is spaced apart from at least two ribs along the longitudinal direction thereof.
  • the front inner side wall of the casing has 3-8 grooves A passing through the front end surface of the casing along the circumference thereof, and the transducer core is fitted in the casing, and the groove A constitutes a component An air flow passage communicating with the outside of the A;
  • the component B includes a cylindrical mounting portion, a cylindrical connecting portion coaxially disposed at a front portion of the mounting portion and connectable to the measuring pipe segment, and disposed axially a plurality of flow guides between the outer surface of the mounting portion and the inner side wall of the connecting portion, the two ends of the flow guiding grid being respectively fixedly connected to the outer surface of the mounting portion and the inner side wall of the connecting portion a plurality of flow guiding channels formed between the flow guiding fence and the mounting portion and the inner sidewall of the connecting portion
  • the inner side wall of the mounting portion is provided with a longitudinal groove B that can cooperate with a rib on the housing of the component A, and the front end of the mounting portion is provided with a fixed snap structure, and the connecting portion is The outer
  • the component A and the component B are assembled to form an axial-pair ultrasonic transducer, and when it is installed in the air-measuring measuring pipeline, the connecting portion of the component B is connected to the measuring pipeline and can be
  • the positioning and sealing between the measuring tube and the measuring tube ensure the alignment of the upstream transducer and the downstream transducer and prevent air leakage, and have good stability.
  • the flow guiding fence disposed on the component B serves on the one hand to support the mounting portion and the connecting portion, and on the other hand, it can guide the airflow in the measuring pipeline, which can effectively reduce the airflow caused by the transducer body in the measuring pipeline. The unevenness makes the measurement accuracy better.
  • the groove A provided in the present invention provides an air flow passage between the outside and the inside of the component A, and can equalize the air pressure inside and outside the component A, so that the pressure of each component in the component A is balanced to obtain high performance and long life.
  • the transducer core is prior art for acoustic energy transmission and signal transmission.
  • the outer side wall of the housing has a taper, and the outer diameter of the front end of the housing is smaller than the outer diameter of the rear end thereof.
  • the outer surface of the rib on the outer side wall of the housing also has the same taper as the outer side wall of the housing; the inner side wall of the mounting portion also has the same taper as the outer side wall of the housing, the groove B The bottom surface of the groove also has the same taper as the outer surface of the rib.
  • one end of one of the flow guiding grids is provided with a wire slot.
  • the wire can pass through the wire guide.
  • grooves A there may be a plurality of grooves A in the present invention, and it is preferable that the grooves A are three.
  • the axis alignment of the upstream transducer and the downstream transducer is ensured, and the sealing structure disposed on the outer sidewall of the connecting portion is At least one concave-convex structure, wherein the concave-convex structure is provided with an O-ring.
  • ribs are three.
  • the invention has the advantages that the structure is simple, the combined structure is adopted, the processing difficulty is low, the production is easy, the assembly and maintenance are convenient, and the production efficiency can be greatly improved.
  • the special structural design such as the matching of the shell A and the shell B and the provision of the sealing ring, the working reliability and service life of the gas flow measuring device are effectively improved.
  • Figure 1 is a front elevational view of the present invention
  • Figure 2 is a cross-sectional view taken along line A-A of Figure 1;
  • Figure 3 is a left side view of Figure 1;
  • Figure 4 is a right side view of Figure 1;
  • Figure 5 is a schematic perspective view of the present invention.
  • Figure 6 is a front elevational view of the component A in the present invention.
  • Figure 7 is a cross-sectional view taken along line B-B of Figure 6;
  • Figure 8 is a plan view of Figure 6;
  • Figure 9 is a bottom view of Figure 6;
  • Figure 10 is a front elevational view of the component B in the present invention.
  • Figure 11 is a cross-sectional view taken along line C-C of Figure 10;
  • Figure 12 is a left side view of Figure 10;
  • Figure 13 is a right side view of Figure 10;
  • Figure 14 is a perspective view showing the structure of the component B
  • a combined axial beam-type ultrasonic transducer for gas flow measurement is composed of a combination of component A and component B.
  • the component A comprises a housing 1 and a transducer core, the housing 1 has a cylindrical structure, the rear end of the housing 1 has a boss 4, and a lower portion of the boss 4 is provided with a sealing gasket 5.
  • the outer side wall of the casing 1 is spaced apart from at least two ribs 3 along its longitudinal direction. In the present embodiment, the ribs 3 are three uniformly arranged.
  • the front inner side wall of the casing 1 has 3-8 grooves A2 along the circumference thereof, and the opening of the groove A2 is open to the front end surface of the casing 1.
  • the number of the grooves A2 is preferably 3 .
  • the transducer core is assembled in the housing 1.
  • the transducer core is prior art, and mainly includes: an acoustic impedance matching layer 7, a piezoelectric sheet 8, a backing material 9, a feeder wiring 13, and a PCB rotation.
  • the board 10, the signal excitation and receiving feed line 12, and the fixed structural adhesive 11 are formed.
  • the acoustic impedance matching layer 7 is fixed to the front end of the body by an adhesive.
  • the piezoelectric sheet 8, the backing material 9, and the PCB adapter board 10 are composed of
  • the rear side of the acoustic impedance matching layer 7 is sequentially installed in the casing and is fixed by the fixing structural adhesive 11, and the acoustic impedance matching layer 7 and the piezoelectric sheet 8 are bonded together by an adhesive, and the feeder wire is connected 13
  • two feeder patch cords 13 are welded to the corresponding side silver electrodes of the piezoelectric sheet 8, and the other ends are soldered to the corresponding pads of the PCB adapter board 10 and are discharged to the outside of the housing.
  • the root feeder patch cord feeds a signal between the piezoelectric sheet and the PCB adapter board.
  • the piezoelectric sheet 8 is used for piezoelectric conversion and inverse piezoelectric conversion
  • the acoustic impedance matching layer 7 is used for impedance matching and acoustic energy transmission with the gas medium
  • the two feeder extension wires 13 are piezoelectric sheets and PCB adapter plates.
  • the intervening signal, the signal excitation and reception feeder 12 is used for signal excitation or reception of the transducer and external circuitry.
  • the groove A2 constitutes an air flow passage that communicates with the outside of the component A, and can balance the internal and external air pressure to balance the pressure of each component of the air-mediated ultrasonic transducer. Its high performance and long life.
  • the component B includes a cylindrical mounting portion 14 , a cylindrical connecting portion 15 coaxially disposed at a front portion of the mounting portion 14 and connectable to the measuring tube segment, and disposed axially outside the mounting portion 14 a plurality of flow guiding grids 17 between the surface and the inner side wall of the connecting portion 15, the flow guiding grid 17 is a plate-like structure, and both ends of the guiding grid 17 and the outer surface of the mounting portion 14 respectively
  • the inner side wall of the connecting portion 15 is fixedly connected, and the plurality of flow guiding channels are formed between the air guiding fence 17 and the mounting portion 14 and the inner side wall of the connecting portion 15.
  • the number of the flow guiding grids 17 in this embodiment is preferably set to three.
  • the inner side wall of the mounting portion 14 is provided with a longitudinal groove B20 engageable with the rib 3 on the casing 1 of the component A, the number of the grooves B20 being the same as the number of the ribs 3 on the casing 1. .
  • the front end of the mounting portion 14 is provided with a fixing buckle structure 16 .
  • the outer side wall of the connecting portion 15 is provided with a sealing structure for sealing the measuring tube segment.
  • the sealing structure in the embodiment is at least one concave-convex groove structure, and the concave-convex groove structure is provided with an O-ring 18 .
  • the component A is assembled in the mounting portion 14 of the component B, and is positioned by the rib 3 and the groove B20.
  • the component A is provided with a fixing hole 6 through which the fixing buckle structure 16 is fixed. Part A is fixed.
  • the present invention also provides a threading hole 21 in the component B, and a wire slot 19 at the end of a flow guiding gate 17 adjacent to the threading hole 21.
  • the outer side wall of the housing 1 has a taper, and the outer diameter of the front end of the housing 1 is smaller than the outer diameter of the rear end thereof.
  • the outer surface of the rib 3 on the outer side wall of the housing 1 also has the same taper as the outer side wall of the housing.
  • the inner side wall of the mounting portion 14 also has the same taper as the outer side wall of the housing, and the bottom surface of the groove B20 also has the same taper as the outer surface of the rib 3.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un transducteur ultrasonore à faisceau traversant axial combiné permettant la mesure d'un flux de gaz, combiné selon une partie A et une partie B. La partie A comprend un boîtier (1) et un noyau de transducteur assemblé dans le boîtier (1) ; le boîtier (1) est de structure cylindrique ; la paroi latérale externe du boîtier (1) comprend, selon des intervalles, au moins deux nervures (3) le long d'une direction verticale de cette dernière ; la paroi latérale interne au niveau de la partie avant du boîtier (1) est agencée de manière circonférentielle avec 3 à 8 rainures A(2) passant à travers la surface d'extrémité avant du boîtier (1) ; et les rainures A(2) constituent un canal de flux de gaz qui fait communiquer l'intérieur et l'extérieur de la partie A. La partie B comprend un élément de montage cylindrique (14), un élément de liaison (15) disposé coaxialement au niveau de la partie avant de l'élément de montage (14), et une pluralité de barrières de flux de gaz (17) disposées axialement entre la surface extérieure d'élément de montage (14) et la paroi latérale interne de l'élément de liaison (15) ; la paroi latérale interne de l'élément de montage (14) est agencée avec des rainures verticales B(20) permettant de faire correspondre les nervures (3) sur le boîtier (1) de la partie A ; la paroi latérale externe de l'élément de liaison (15) comprend une structure d'étanchéité (18) permettant une étanchéité avec un segment de tuyau de mesure. La partie A est assemblée dans l'élément de montage (14) de la partie B et permet d'obtenir un positionnement correspondant avec les rainures B(20) au moyen des nervures (3). Le transducteur ultrasonore présente une structure combinée, une faible difficulté de traitement, est pratique à assembler et à réparer, et permet d'améliorer l'efficacité de production. La conception structurale de mise en correspondance de la partie A avec la partie B et la conception de la structure d'étanchéité améliorent la fiabilité de travail et la durée de vie d'un dispositif de mesure de flux de gaz.
PCT/CN2018/079436 2017-08-01 2018-03-19 Transducteur ultrasonore à faisceau traversant axial combiné permettant la mesure d'un flux de gaz WO2019024512A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201720947772.5 2017-08-01
CN201720947772.5U CN207019729U (zh) 2017-08-01 2017-08-01 用于气体流量测量的组合型轴向对射式超声波换能器

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WO2019024512A1 true WO2019024512A1 (fr) 2019-02-07

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CN (1) CN207019729U (fr)
WO (1) WO2019024512A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207019729U (zh) * 2017-08-01 2018-02-16 青岛积成电子股份有限公司 用于气体流量测量的组合型轴向对射式超声波换能器
CN109655118A (zh) * 2019-01-21 2019-04-19 青岛积成电子股份有限公司 一种用于气体流量测量的超声波测量装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0565851A1 (fr) * 1992-04-14 1993-10-20 Landis & Gyr Technology Innovation AG Capteur ultrasonique pour la détermination du débit d'un liquide en écoulement
CN202083417U (zh) * 2011-05-31 2011-12-21 际华三五零二职业装有限公司 涡街流量计用超声式探头
CN102597714A (zh) * 2009-10-29 2012-07-18 罗伯特·博世有限公司 用于在流体介质中使用的超声波换能器
CN102667417A (zh) * 2009-10-29 2012-09-12 罗伯特·博世有限公司 用于在流体介质中使用的超声波换能器
CN104344859A (zh) * 2013-08-08 2015-02-11 通用电气公司 换能器系统
CN106525181A (zh) * 2016-12-26 2017-03-22 上海宾峰仪器科技有限公司 双壳体带温补气体超声换能器
CN207019729U (zh) * 2017-08-01 2018-02-16 青岛积成电子股份有限公司 用于气体流量测量的组合型轴向对射式超声波换能器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0565851A1 (fr) * 1992-04-14 1993-10-20 Landis & Gyr Technology Innovation AG Capteur ultrasonique pour la détermination du débit d'un liquide en écoulement
CN102597714A (zh) * 2009-10-29 2012-07-18 罗伯特·博世有限公司 用于在流体介质中使用的超声波换能器
CN102667417A (zh) * 2009-10-29 2012-09-12 罗伯特·博世有限公司 用于在流体介质中使用的超声波换能器
CN202083417U (zh) * 2011-05-31 2011-12-21 际华三五零二职业装有限公司 涡街流量计用超声式探头
CN104344859A (zh) * 2013-08-08 2015-02-11 通用电气公司 换能器系统
CN106525181A (zh) * 2016-12-26 2017-03-22 上海宾峰仪器科技有限公司 双壳体带温补气体超声换能器
CN207019729U (zh) * 2017-08-01 2018-02-16 青岛积成电子股份有限公司 用于气体流量测量的组合型轴向对射式超声波换能器

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