JPH02132327A - Ultrasonic sensor for high temperature - Google Patents
Ultrasonic sensor for high temperatureInfo
- Publication number
- JPH02132327A JPH02132327A JP63287312A JP28731288A JPH02132327A JP H02132327 A JPH02132327 A JP H02132327A JP 63287312 A JP63287312 A JP 63287312A JP 28731288 A JP28731288 A JP 28731288A JP H02132327 A JPH02132327 A JP H02132327A
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic
- wedge
- ultrasonic sensor
- temp
- nak
- 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.)
- Pending
Links
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 abstract description 5
- 239000004519 grease Substances 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 239000011734 sodium Substances 0.000 description 9
- 238000009835 boiling Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、例えば超音波を用いた超音波流量計の送・受
波器に係り、特に火力発電や原子力発電におけるボイラ
ーまわりの流量測定、あるいは高速増殖炉で冷却剤とし
て用いられる液体Ｎａの流量測定に適した高温用超音波
センサーに関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a transmitter/receiver for an ultrasonic flowmeter using ultrasonic waves, and in particular to a boiler in thermal power generation or nuclear power generation. The present invention relates to a high-temperature ultrasonic sensor suitable for measuring the flow rate in the surrounding environment or for measuring the flow rate of liquid Na used as a coolant in a fast breeder reactor.
（従来の技術）
従来の高温用超音波流量計用センサーの例を第４図に示
す（引用文献実公昭５５−７２１６０号）。超音波振動
子（１）で発生した超音波を効率良く被測定対象側、こ
の場合くさび（３）に伝搬させるために、超音波振動子
（１）とくさび（３）の接合面にグリースなどの液状物
を用いる。しかし、被測定対象が高温の場合は、グリー
スなどの伝搬媒体は、耐熱性の点で使用できず、第３図
に示すように、耐高温性のオイル（１１）と金箔（１２
）を伝搬媒体として用いたものがあった。(Prior Art) An example of a conventional sensor for a high-temperature ultrasonic flowmeter is shown in FIG. 4 (cited document Utility Model Publication No. 72160/1983). In order to efficiently propagate the ultrasonic waves generated by the ultrasonic transducer (1) to the side to be measured, in this case to the wedge (3), apply grease or the like to the joint surface between the ultrasonic transducer (1) and the wedge (3). Use a liquid substance. However, when the object to be measured is at a high temperature, propagation media such as grease cannot be used due to their heat resistance.As shown in Figure 3, high temperature resistant oil (11) and gold foil (12
) was used as a propagation medium.
（発明が解決しようとする問題点）
従来技術では伝搬媒体としてオイルを用いているが、オ
イルの場合耐熱性はせいぜい２５０℃位までであり、高
速増殖炉でのＮａ流量測定に要求される６００℃には程
遠いものであった。そこで本発明は、Ｎａ流量測定にも
十分使用可能な耐熱性の高い伝搬媒体を備えた高温用超
音波センサーを実現することを課題とし、本発明の目的
もそこにある。(Problems to be Solved by the Invention) In the conventional technology, oil is used as a propagation medium, but the heat resistance of oil is at most 250°C, which is higher than 600°C, which is required for Na flow measurement in fast breeder reactors. It was far from ℃. Therefore, an object of the present invention is to realize a high-temperature ultrasonic sensor equipped with a highly heat-resistant propagation medium that can be used to measure the flow rate of Na, and that is also the purpose of the present invention.
（課題を解決するための手段）
本発明の高温用超音波センサーは、超音波振動子とくさ
びの接合面に、この接合面の周辺を残して前記くさびに
形成された微小深さの凹部による空隙部を設け、この空
隙部に液体金属を封入した構成である。(Means for Solving the Problems) The high-temperature ultrasonic sensor of the present invention has a recess of minute depth formed in the joining surface of the ultrasonic vibrator and the wedge, leaving the periphery of this joining surface. It has a structure in which a cavity is provided and liquid metal is sealed in this cavity.
（作 用）
本発明の高温用超音波センサーでは、空隙部に封入する
液体金属として例えばＮａＫ （ＮａとＫの合金で常温
で液体）を用いれば、７００’Ｃ程度までの高温域で伝
搬媒体として機能し、効率良く超音波を伝搬することが
できる。(Function) In the high-temperature ultrasonic sensor of the present invention, if NaK (an alloy of Na and K, which is liquid at room temperature) is used as the liquid metal sealed in the cavity, the propagation medium can be used in the high-temperature range up to about 700'C. It can efficiently propagate ultrasonic waves.
（実施例）
以下．図面に示した実施例に基いて本発明を詳細に説明
する。(Example) Below. The present invention will be explained in detail based on embodiments shown in the drawings.
第１図および第２図に本発明一実施例の高温用超音波セ
ンサーを示す。第２図は第１図のＡ部の拡大図である。FIG. 1 and FIG. 2 show a high temperature ultrasonic sensor according to an embodiment of the present invention. FIG. 2 is an enlarged view of section A in FIG. 1.
超音波振動子（１）は、耐高温材（例えばステンレスな
どの金属材）で作られたくさび（３）に接合されている
。くさび（３）の接合面には、接合面の周辺を残して形
成された微小深さの凹部による空隙部（６）が設けられ
、この空隙部（６）には伝搬媒体として液体のＮａＫ（
２）が封入されている。The ultrasonic transducer (1) is joined to a wedge (3) made of a high temperature resistant material (for example, a metal material such as stainless steel). The joint surface of the wedge (3) is provided with a cavity (6) formed by a microscopic recess formed leaving the periphery of the joint surface, and this cavity (6) is filled with liquid NaK (
2) is included.
超音波振動子（１）は、一般にチタン酸バリウムやジル
コンチタン酸鉛などの電歪素子（４）を円板状にし、そ
の両端面に銀などの導体の蒸着などにより形成された電
極（５）を有する構造である。The ultrasonic vibrator (1) is generally made of an electrostrictive element (4) made of barium titanate or lead zirconium titanate into a disk shape, and has electrodes (5) formed on both end surfaces by vapor deposition of a conductor such as silver. ).
空隙部（６）に封入する伝搬媒体としては、水銀（融点
−３８．８７℃、沸点３５６．６℃），ナトリウム（融
点９８℃、沸点８８９℃）、カリウム（融点６３．４℃
、沸点７５７℃）およびＮａとＫとの合金ＮａＫ （例
えばＫ７８％、Ｎａ２２％の場合、融点−１１℃，沸点
７８４℃）などがあるが、常温で液体で且つ沸点の高い
ＮａＫが最も適している，しかし，前記の各物質は、い
ずれも空気や水に触れると化学反応を起し物性が変って
しまうため、空気や水に触れないようにしなければなら
ない。The propagation medium sealed in the cavity (6) includes mercury (melting point -38.87°C, boiling point 356.6°C), sodium (melting point 98°C, boiling point 889°C), potassium (melting point 63.4°C).
, boiling point: 757°C) and NaK, an alloy of Na and K (for example, in the case of 78% K and 22% Na, the melting point is -11°C and the boiling point is 784°C), but NaK, which is liquid at room temperature and has a high boiling point, is the most suitable. However, each of the above substances causes chemical reactions and changes in physical properties when they come in contact with air or water, so they must be prevented from coming into contact with air or water.
したがって、空隙部（６）を外部と気密に隔離するため
、超音波振動子（１）とくさび（３）とはその全周縁の
接触部（７）をろう付などにより接合する。Therefore, in order to airtightly isolate the cavity (6) from the outside, the ultrasonic transducer (1) and the wedge (3) are joined together at their contact portions (7) on the entire periphery by brazing or the like.
そして空隙部（６）内を真空に引いた後、ＮａＫ（２）
を気泡等が残らないように空隙部（６）に注入し、注４
一
入口を封止する。After drawing a vacuum inside the cavity (6), NaK (2)
Inject into the cavity (6) so that no air bubbles etc. remain, and
Seal one entrance.
上記のように構成された本発明一実施例の高温用超音波
センサーの作用を以下に述べる。超音波振動子（１）の
両端の電極（５）に電圧をかけると、電歪素子（４）が
振動し、その振動は、封入されてぃるＮａＫ（２）を介
してくさび（３）に伝搬される。The operation of the high temperature ultrasonic sensor according to one embodiment of the present invention constructed as described above will be described below. When voltage is applied to the electrodes (5) at both ends of the ultrasonic vibrator (1), the electrostrictive element (4) vibrates, and the vibration is transmitted through the enclosed NaK (2) to the wedge (3). is propagated to.
第３図に本実施例の高温用超音波センサーを用いた超音
波流量計の例を示す。配管（８）内を高温流体（９）、
例えばＮａが矢印方向に流れている。配管（８）には、
１対のくさび（３），（３’）が図示のように設けられ
ており、くさび（３） ． （３’）にはそれぞれ超音
波振動子（１），（１’）が接合されている。超音波振
動子（１）で発生した超音波は伝搬媒体のＮａＫを介し
てくさび（３）に伝わり、さらに配管（８）外壁を経由
して流体（９）中を伝搬し、受波側の配管壁，くさび，
ＮａＫを介して超音波振動子（１）に伝達される。FIG. 3 shows an example of an ultrasonic flowmeter using the high temperature ultrasonic sensor of this embodiment. High temperature fluid (9) inside the pipe (8),
For example, Na is flowing in the direction of the arrow. In the piping (8),
A pair of wedges (3), (3') are provided as shown, with wedge (3) . Ultrasonic transducers (1) and (1') are connected to (3'), respectively. The ultrasonic wave generated by the ultrasonic transducer (1) is transmitted to the wedge (3) via the propagation medium NaK, and further propagates through the fluid (9) via the outer wall of the pipe (8), and is transmitted to the receiving side. piping wall, wedge,
It is transmitted to the ultrasonic transducer (1) via NaK.
このときの超音波の伝搬時間は、高温流体（９）が流れ
ている場合はその流速に応じて変化する。この流速によ
る超音波伝搬時間の変化から流体の流速を検出し、流量
を算出する。超音波流量計の場合、流体の温度変化によ
る影響をなくすため、超音波の発信は、振動子（１）→
（１′）と（１′）→（１）とを交互に繰返し行なうと
いうように送波と受波を同じ振動子で交互に切換えて行
なう。つまり、１対設けられた超音波振動子（１），（
１’）およびくさび（３） ， （３’）は同一形状の
ものでよい。The propagation time of the ultrasonic waves at this time changes depending on the flow velocity when the high temperature fluid (9) is flowing. The flow velocity of the fluid is detected from the change in ultrasonic propagation time due to this flow velocity, and the flow rate is calculated. In the case of an ultrasonic flowmeter, in order to eliminate the influence of temperature changes in the fluid, ultrasonic waves are transmitted from the vibrator (1) →
(1') and (1')→(1) are alternately repeated, and the transmission and reception are alternately performed using the same vibrator. In other words, a pair of ultrasonic transducers (1), (
1') and wedges (3) and (3') may have the same shape.
上述したように、本発明一実施例の高温用超音波センサ
ーにおいては、超音波振動子（１）とくさび（３）の間
に伝搬媒体として液体のＮａＫ （沸点７８４℃）を気
密封入しているので、超音波の伝搬効率が良く、約７０
０℃までの高温で使用できるとともに、ＮａＫを気密封
入しているためＮａＫの劣化が起らず、長期間の使用に
耐えることができる。As mentioned above, in the high-temperature ultrasonic sensor according to one embodiment of the present invention, liquid NaK (boiling point 784°C) is hermetically sealed between the ultrasonic vibrator (1) and the wedge (3) as a propagation medium. Because of this, the propagation efficiency of ultrasonic waves is good, and approximately 70
It can be used at high temperatures up to 0°C, and since NaK is hermetically sealed, NaK does not deteriorate and can withstand long-term use.
以上詳述したように本発明によれば、超音波振動子とく
さびの接合面に伝搬媒体としてＮａＫなどの液体金属を
気密封入した高温用超音波センサーを実現したことから
、超音波の伝搬効率が良く、しかも、約７００℃までの
高温で使用可能であるとともに長期間の使用に耐える高
温用超音波センサーを提供できる。As detailed above, according to the present invention, a high-temperature ultrasonic sensor is realized in which a liquid metal such as NaK is hermetically sealed as a propagation medium on the joint surface of an ultrasonic transducer and a wedge, which improves the propagation efficiency of ultrasonic waves. It is possible to provide a high-temperature ultrasonic sensor that has good performance, can be used at high temperatures up to about 700°C, and can withstand long-term use.
また、現在はオリフィス流量計が用いられている火力発
電の高温高圧の給水流量測定に、本発明の高温用超音波
センサーを用いた超音波流量計を使用すれば、測定精度
を約２％前後から１％程度に向上できる。また、現在は
電磁流量計が用いられている高速増殖炉のＮａ流量測定
にも本発明の高温用超音波センサーを用いた超音波流景
計の使用が可能となり、大幅なコストダウンが見込まれ
る。Additionally, if an ultrasonic flowmeter using the high-temperature ultrasonic sensor of the present invention is used to measure the flow rate of high-temperature, high-pressure feed water for thermal power generation, where orifice flowmeters are currently used, the measurement accuracy can be improved by approximately 2%. This can be improved from about 1%. In addition, the ultrasonic flowmeter using the high-temperature ultrasonic sensor of the present invention can be used to measure the Na flow rate in fast breeder reactors, where electromagnetic flowmeters are currently used, and significant cost reductions are expected. .
第１図は本発明一実施例の高温用超音波センサーを示す
概略断面図、第２図は第１図のＡ部の拡大図、第３図は
第１図の高温用超音波センサーを用いた超音波流量計を
示す概略図、第４図は従来の高温用超音波流量計用セン
サーの一例を示す概略図である。
１・・・超音波振動子 ２・・・封入された液体金属
３・・・くさび ４・・・電歪素子５・・・電
極 ６・・・空隙部７・・接触部
代理人 弁理士 大 胡 典 夫FIG. 1 is a schematic cross-sectional view showing a high temperature ultrasonic sensor according to an embodiment of the present invention, FIG. 2 is an enlarged view of section A in FIG. FIG. 4 is a schematic diagram showing an example of a conventional sensor for a high-temperature ultrasonic flow meter. 1... Ultrasonic vibrator 2... Enclosed liquid metal 3... Wedge 4... Electrostrictive element 5... Electrode 6... Cavity part 7... Contact part agent Patent attorney Dai Hu Dianfu
Claims (2)
周辺を残して前記くさびに形成された微小深さの凹部に
よる空隙部を設け、この空隙部に液体金属を封入して成
る高温用超音波センサー。(1) A gap formed by a micro-deep recess formed in the wedge is provided at the joint surface of the ultrasonic transducer and the wedge, leaving the periphery of the joint surface, and liquid metal is filled in this cavity. Ultrasonic sensor for high temperature.
の高温用超音波センサー。(2) The high temperature ultrasonic sensor according to claim 1, wherein NaK is used as the liquid metal to be sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63287312A JPH02132327A (en) | 1988-11-14 | 1988-11-14 | Ultrasonic sensor for high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63287312A JPH02132327A (en) | 1988-11-14 | 1988-11-14 | Ultrasonic sensor for high temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02132327A true JPH02132327A (en) | 1990-05-21 |
Family
ID=17715739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63287312A Pending JPH02132327A (en) | 1988-11-14 | 1988-11-14 | Ultrasonic sensor for high temperature |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02132327A (en) |
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| WO2005010864A1 (en) * | 2003-07-21 | 2005-02-03 | Horiba Instruments, Inc. | Acoustic transducer |
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| KR101139592B1 (en) * | 2010-08-11 | 2012-04-27 | 한국수력원자력 주식회사 | longitudinal wave transducer wedge to maintain couplant layer and longitudinal wave transducer using the same |
| WO2013099607A1 (en) | 2011-12-28 | 2013-07-04 | 東レバッテリーセパレータフィルム株式会社 | Polyolefin microporous film and method for producing same |
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| WO2020096061A1 (en) | 2018-11-09 | 2020-05-14 | 東レ株式会社 | Porous polyolefin film, cell separator, and secondary cell |
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-
1988
- 1988-11-14 JP JP63287312A patent/JPH02132327A/en active Pending
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| KR101139592B1 (en) * | 2010-08-11 | 2012-04-27 | 한국수력원자력 주식회사 | longitudinal wave transducer wedge to maintain couplant layer and longitudinal wave transducer using the same |
| WO2013099607A1 (en) | 2011-12-28 | 2013-07-04 | 東レバッテリーセパレータフィルム株式会社 | Polyolefin microporous film and method for producing same |
| WO2014076994A1 (en) | 2012-11-16 | 2014-05-22 | 東レバッテリーセパレータフィルム株式会社 | Battery separator |
| US10411237B2 (en) | 2013-05-31 | 2019-09-10 | Toray Industries, Inc. | Multilayer, microporous polyolefin membrane, and production method thereof |
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| WO2018164054A1 (en) | 2017-03-08 | 2018-09-13 | 東レ株式会社 | Polyolefin microporous membrane |
| WO2019093184A1 (en) | 2017-11-08 | 2019-05-16 | 東レ株式会社 | Polyolefin composite porous film, method for producing same, battery separator, and battery |
| WO2020096061A1 (en) | 2018-11-09 | 2020-05-14 | 東レ株式会社 | Porous polyolefin film, cell separator, and secondary cell |
| KR102017171B1 (en) * | 2018-12-07 | 2019-09-02 | (주)엘라켐 | Phased array ultrasonic probe device for rail inspection with excellent preservation of couplant |
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| WO2020203908A1 (en) | 2019-03-29 | 2020-10-08 | 東レ株式会社 | Microporous polyolefin film, separator for battery, and secondary battery |
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