JP2006126019A

JP2006126019A - Ultrasonic flowmeter

Info

Publication number: JP2006126019A
Application number: JP2004315066A
Authority: JP
Inventors: Mitsugi Sano; 貢佐野; Naotaka Matsushita; 尚孝松下
Original assignee: Honda Electronics Co Ltd
Current assignee: Honda Electronics Co Ltd
Priority date: 2004-10-29
Filing date: 2004-10-29
Publication date: 2006-05-18

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter which is simple in structure, is easy to manufacture, and makes transmission and reception of ultrasonic waves stable owing to its simple structure. <P>SOLUTION: A desired length of a measuring tube 12 is fixed to the side of a tubular body 11 at an angle. A piezoelectric oscillator 13 is attached to the closed end of the measuring tube 12. A measuring tube 14 is fixed to the position facing the measuring tube 12 at the same angle so that ultrasonic waves from the piezoelectric oscillator 13 travel in a straight line. A piezoelectric oscillator 15 is attached to the closed end of the measuring tube 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、計測液体を流す道管に傾斜した２つの計測管を装着した超音波流量計に関するものである。 The present invention relates to an ultrasonic flowmeter in which two measurement tubes inclined to a channel tube through which a measurement liquid flows are mounted.

従来のこの種の超音波流量計としては、図２に示すように、管体１の密閉された両端部にそれぞれ圧電体振動子２、３が装着され、管体１の側部に計測液体流入口４及び計測液体流出口５を設け、計測液体流入口４から入れた計測液体が管体１を通って計測液体流出口５から流出し、管体１を流れる計測液体の流量を計測するように構成された装置が提案され、又、図３に示すように、計測液体を流す管体６の表面に対して４５度の角度を持った第１のシュー７を管体６の側面に装着し、第１のシュー７の端部に第１の圧電体振動子８を装着し、又、管体６を挟んで対向する位置に第２のシュー９を装着し、この第２のシュー９の端部に第２の圧電体振動子１０を装着し、管体６を流れる計測液体を第１の圧電体振動子８から照射された超音波は第１のシュー７から管体１内の計測液体を通り、第２のシュー９を通って第２の圧電体振動子１０で超音波を検出し、又、第２の圧電体振動子１０からされた超音波は第１のシュー７に装着された第１の圧電体振動子８で検出することにより、管体６を流れる計測液体の流量を検出するようにした装置が提案されている。 As a conventional ultrasonic flowmeter of this type, as shown in FIG. 2, piezoelectric vibrators 2 and 3 are attached to both ends of the tube body 1 which are sealed, and a measurement liquid is disposed on the side portion of the tube body 1. An inlet 4 and a measurement liquid outlet 5 are provided, and the measurement liquid introduced from the measurement liquid inlet 4 flows out of the measurement liquid outlet 5 through the tube 1 and measures the flow rate of the measurement liquid flowing through the tube 1. An apparatus configured as described above is proposed, and as shown in FIG. 3, a first shoe 7 having an angle of 45 degrees with respect to the surface of the tube body 6 through which the measurement liquid flows is provided on the side surface of the tube body 6. The first piezoelectric vibrator 8 is attached to the end of the first shoe 7, and the second shoe 9 is attached to the opposite position across the tube 6, and this second shoe The second piezoelectric vibrator 10 is attached to the end of 9, and the supersonic sound irradiated from the first piezoelectric vibrator 8 with the measurement liquid flowing through the tube body 6 Passes through the measurement liquid in the tube 1 from the first shoe 7, passes through the second shoe 9, detects the ultrasonic wave with the second piezoelectric vibrator 10, and also detects the second piezoelectric vibrator 10 An apparatus has been proposed in which the ultrasonic wave generated is detected by a first piezoelectric vibrator 8 mounted on the first shoe 7 to detect the flow rate of the measurement liquid flowing through the tube body 6. .

このように構成された図２の超音波流量計では、計測液体は計測液体流入口４から計測液体流出口５に流れるために、流量が変更され、又、計測液体が計測液体流入口４から管体１に流入され、計測液体流出口５から流出されるために、圧力損失が生じ、計測液体の正確な流量が計測できないという問題がある。 In the ultrasonic flow meter of FIG. 2 configured as described above, the measurement liquid flows from the measurement liquid inlet 4 to the measurement liquid outlet 5, so that the flow rate is changed, and the measurement liquid flows from the measurement liquid inlet 4. Since it flows into the tube body 1 and flows out from the measurement liquid outlet 5, there is a problem that pressure loss occurs and the accurate flow rate of the measurement liquid cannot be measured.

又、図３に示す超音波流量計では、管体６に後から取り付けることができるが、管体６が細管の場合は、超音波の伝播距離が得られず、分解能が低いことから計測精度が低くなるという問題があり、さらに、管体６の厚みを入力して補正しなければならないので、計測作業が煩わしいという問題がある。
特願２００３−１６９７２ In addition, the ultrasonic flow meter shown in FIG. 3 can be attached to the tube body 6 later. However, when the tube body 6 is a thin tube, the ultrasonic wave propagation distance cannot be obtained and the resolution is low. Further, there is a problem that the measurement work is troublesome because the thickness of the tube body 6 must be input and corrected.
Japanese Patent Application No. 2003-16972

解決しようとする問題点は、従来の超音波流量計では、両端が密閉された管体で流量を計測する場合は、管体の側部に計測液体流入口及び流出口を設けるために、流量が変更され、管体にシューを取付る流量計測では、計測精度が低くなり、又、計測作業が煩わしいという問題がある。 The problem to be solved is that in the conventional ultrasonic flowmeter, when the flow rate is measured with a tube body sealed at both ends, a flow rate is required in order to provide a measurement liquid inlet and outlet at the side of the tube body. In the flow rate measurement in which the shoe is attached to the pipe body, there is a problem that the measurement accuracy is low and the measurement work is troublesome.

本発明では、計測液体を流す管体の側部に、管体と連通する傾斜した２つの計測管を対向して固着し、この２つの計測管の密閉した端部にそれぞれ超音波振動子を装着し、一方の超音波振動子から超音波を送信し、他方の超音波振動子で送信された超音波を受信することにより、前記管体に流される前記計測液体の流量を計測するものである。 In the present invention, two inclined measurement tubes communicating with the tube body are fixed to the side portion of the tube body through which the measurement liquid flows, and ultrasonic transducers are respectively attached to the sealed end portions of the two measurement tubes. It is attached to measure the flow rate of the measurement liquid flowing through the tubular body by transmitting ultrasonic waves from one ultrasonic transducer and receiving ultrasonic waves transmitted by the other ultrasonic transducer. is there.

本発明の超音波流量計では、計測液体を流す管体の側部に、管体と連通する傾斜した２つの計測管を対向して固着しているために、構造が比較的簡単で、製作が容易であり、又、計測管の密閉した端部に固着した超音波振動子を対向させているため、超音波振動子の間の距離が一定となり、計測管の径による設定条件の変更が無くので、分解能に変更が無く、さらに、超音波の送受波は単純構造のために安定しているという利点がある。 In the ultrasonic flowmeter of the present invention, two inclined measuring pipes communicating with the pipe body are fixed to the side of the pipe body through which the measurement liquid flows, so that the structure is relatively simple and manufactured. Since the ultrasonic transducers fixed to the sealed end of the measurement tube are facing each other, the distance between the ultrasonic transducers is constant, and the setting conditions can be changed depending on the diameter of the measurement tube. Since there is no change in resolution, there is an advantage that transmission and reception of ultrasonic waves are stable due to a simple structure.

本発明では、管体は計測液体を流し、２つの計測管は管体に連通し、傾斜して対向するように構成され、又、超音波振動子は２つの計測管のそれぞれの密閉された端部に装着され、一方の超音波振動子から超音波を送信し、他方の超音波振動子で送信された超音波を受信することにより、前記管体に流される前記計測液体の流量を計測する。 In the present invention, the tube body is configured to flow the measurement liquid, the two measurement tubes communicate with the tube body, are configured to be inclined and face each other, and the ultrasonic transducer is sealed in each of the two measurement tubes. The flow rate of the measurement liquid that flows through the tube is measured by attaching ultrasonic waves from one ultrasonic transducer and receiving ultrasonic waves transmitted from the other ultrasonic transducer. To do.

図１は本発明の実施例の超音波流量計の側面図で、管体１１の側部に所望の長さの計測管１２が傾斜して固着され、この計測管１２の閉じられた端部に圧電体振動子１３が装着され、又、この計測管１２と対向する位置に同じ角度で、圧電体振動子１３からの超音波が直進するように計測管１４が傾斜して固着され、この計測管１４の閉じられた端部に圧電体振動子１５が装着されている。 FIG. 1 is a side view of an ultrasonic flowmeter according to an embodiment of the present invention. A measuring tube 12 having a desired length is fixedly attached to a side portion of a tube body 11 and a closed end portion of the measuring tube 12 is closed. The piezoelectric vibrator 13 is attached to the measuring pipe 14, and the measuring pipe 14 is inclined and fixed so that the ultrasonic wave from the piezoelectric vibrator 13 goes straight at the same angle at a position facing the measuring pipe 12. A piezoelectric vibrator 15 is attached to the closed end of the measuring tube 14.

このように構成された本実施例の超音波流量計では、管体１１の中を計測液体が流通され、計測管１２、１３の中に泡等が入らないように計測液体が入れられた状態で、計測管１２の端部に装着された圧電体振動子１３からから超音波が照射されると、超音波は計測管１２を通って管体１１に流れる計測液体を横切り、計測管１４から圧電体振動子１５に入力され、又、圧電体振動子１５から照射された超音波は計測管１４を通り、管体１１の計測液体を横切って計測管１２の圧電体振動子１３に入力されので、この圧電体振動子１３から照射されて圧電体振動子１５に入力されさるまでの超音波が移動する時間と圧電体振動子１５から照射され圧電体振動子１３に入力されるまでの超音波が移動する時間の差から計測管１１を流れる計測液体の流量を計測することができる。 In the ultrasonic flowmeter of the present embodiment configured as described above, the measurement liquid is circulated through the tube 11 and the measurement liquid is placed so that bubbles or the like do not enter the measurement tubes 12 and 13. When the ultrasonic wave is irradiated from the piezoelectric vibrator 13 attached to the end of the measurement tube 12, the ultrasonic wave crosses the measurement liquid flowing through the measurement tube 12 to the tube body 11, and from the measurement tube 14. The ultrasonic wave input to the piezoelectric vibrator 15 and irradiated from the piezoelectric vibrator 15 passes through the measurement tube 14, crosses the measurement liquid in the tube body 11, and is input to the piezoelectric vibrator 13 in the measurement tube 12. Therefore, the time required for the ultrasonic wave to move from the piezoelectric vibrator 13 until it is input to the piezoelectric vibrator 15 and the time it takes for the ultrasonic wave to be input from the piezoelectric vibrator 15 and input to the piezoelectric vibrator 13 Measuring liquid flowing through the measuring tube 11 due to the difference in time during which the sound wave travels It is possible to measure the flow rate.

このように、本実施例では、管体１１に計測管１３、１４が固着し、それぞれの計測管１２、１４の端部に圧電体振動子１３、１５を一体に構成した超音波流量計を計測液体を計測する配管の途中に挿入することにより、簡単に計測液体の流量を計測することができるという利点がある。 As described above, in this embodiment, the ultrasonic flowmeter in which the measurement tubes 13 and 14 are fixed to the tube body 11 and the piezoelectric vibrators 13 and 15 are integrally formed at the ends of the measurement tubes 12 and 14 is provided. There is an advantage that the flow rate of the measuring liquid can be easily measured by inserting the measuring liquid in the middle of the pipe for measuring.

なお、上記実施例において、計測管１２、１４を円筒状のもので構成したが、断面が正四角形又は長方形のもので構成することができる。 In addition, in the said Example, although the measurement tubes 12 and 14 were comprised by the cylindrical thing, a cross section can be comprised by a regular square or a rectangle.

本発明の実施例の超音波流量計の側面断面図である。It is side surface sectional drawing of the ultrasonic flowmeter of the Example of this invention. 従来の超音波流量計の側面図である。It is a side view of the conventional ultrasonic flowmeter. 従来の他の超音波流量計の側面図である。It is a side view of the other conventional ultrasonic flowmeter.

符号の説明Explanation of symbols

１１管体
１２、１３計測管
１３、１５圧電体振動子 11 Tubing 12, 13 Measuring tube 13, 15 Piezoelectric vibrator

Claims

計測液体を流す管体と、該管体に連通し、傾斜して対向した２つの計測管と、該２つの計測管のそれぞれの密閉された端部に装着された超音波振動子とからなり、一方の超音波振動子から超音波を送信し、他方の超音波振動子で送信された超音波を受信することにより、前記管体に流される前記計測液体の流量を計測する超音波流量計。 It consists of a tube for flowing the measurement liquid, two measurement tubes that communicate with the tube and face each other at an angle, and an ultrasonic transducer attached to each of the sealed ends of the two measurement tubes. An ultrasonic flowmeter that measures the flow rate of the measurement liquid flowing through the tubular body by transmitting ultrasonic waves from one ultrasonic transducer and receiving ultrasonic waves transmitted by the other ultrasonic transducer .