JP4894704B2 - Fluid flow measuring device - Google Patents
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- JP4894704B2 JP4894704B2 JP2007257312A JP2007257312A JP4894704B2 JP 4894704 B2 JP4894704 B2 JP 4894704B2 JP 2007257312 A JP2007257312 A JP 2007257312A JP 2007257312 A JP2007257312 A JP 2007257312A JP 4894704 B2 JP4894704 B2 JP 4894704B2
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本発明は超音波振動子およびそれを用いて発生させた超音波により気体の流量や流速の計測を行う流体の流れ計測装置に関するものである。 The present invention relates to an ultrasonic transducer and a fluid flow measuring device that measures the flow rate and flow velocity of a gas using ultrasonic waves generated by the ultrasonic transducer.
従来この種の流れ計測装置における超音波振動子にあっては、例えば図５に示すように、流体の流入孔１と、流量計測部５と、流体の流出孔２とからなり、前記流入孔１と前記流量計測部５との間に、流入側整流部３を設け、かつ、前記流量計測部５と前記流出孔２との間に、流出側整流部４を設け、流入側と流出側とが対称となるよう構成したものがあった（例えば、特許文献１参照）。そしてこの従来の流れ計測装置では、流入側から流体を順流で流した時も、流出側から流体を逆流で流した時も、流体の流量を安定して正確に計測することができる。また、流量計測装置の取付け方向が限定されるということがなくなる。さらに、流体に圧力変動がある場合にも、流量計測装置に方向性がなく対称であるため、順流で流した時も、逆流で流した時も、正確に計測することができる。 Conventionally, an ultrasonic transducer in this type of flow measuring device includes a fluid inflow hole 1, a flow rate measuring unit 5, and a fluid outflow hole 2, as shown in FIG. 1 and the flow rate measurement unit 5 are provided with an inflow side rectification unit 3, and an outflow side rectification unit 4 is provided between the flow rate measurement unit 5 and the outflow hole 2. Have been configured to be symmetrical (see, for example, Patent Document 1). In this conventional flow measuring device, the flow rate of the fluid can be stably and accurately measured both when the fluid flows in the forward flow from the inflow side and when the fluid flows in the reverse flow from the outflow side. Further, the mounting direction of the flow rate measuring device is not limited. Furthermore, even when there is a pressure fluctuation in the fluid, the flow rate measuring device has no directivity and is symmetric, so that it is possible to accurately measure whether the fluid flows in a forward flow or a reverse flow.
また図６に示すように、前記整流部をチャンバ６と整流部材７、８とで構成していた。この場合、流入側から流体を流した時も、流出側から流体を逆流させた時も、前記チャンバ６部で流体が一度拡大した後、縮小するので、流体が流路内を非常に安定して流れる。また、整流部材７で流れが整流されるため、流体が流路内を非常に安定して流れる。特に、流量計測部５内では安定して流れるので、正確に流体の流量を計測することができる。
しかしながら、前記従来の構成では、整流部材７、８は、流量計測部５の計測性能に大きく影響を与え、形状がどうしても複雑になり、図７に示す、整流部分を構成するメッシュ９やハニカム１０を保持するケースの構成部材の一部あるいは全体に樹脂材料が用いられ、整流部材７の整流部分が電気的に絶縁されることにより、計測する流体によって、整流部分が帯電してしまい、整流部分の表面に塵埃が付着しやすくなるという課題があった。そして、超音波を整流部材の整流部分を通過させて、超音波振動子間の超音波伝搬時間にもとづいて前記被測定流体の流速および／または流量を測定するようにした流体の流れ計測装置においては、整流部分の表面に塵埃が付着すると、整流部分の圧損が大きくなくても、超音波が塵埃の影響を受け、相対する超音波振動子に超音波が到達せず、測定不能となる現象を生じていた。 However, in the conventional configuration, the rectifying members 7 and 8 greatly affect the measurement performance of the flow rate measuring unit 5 and the shape is inevitably complicated, and the mesh 9 and the honeycomb 10 constituting the rectifying portion shown in FIG. A resin material is used for a part or all of the constituent members of the case for holding the rectifying member, and the rectifying part of the rectifying member 7 is electrically insulated, so that the rectifying part is charged by the fluid to be measured, and the rectifying part There has been a problem that dust easily adheres to the surface of the material. In the fluid flow measuring device, the ultrasonic wave is passed through the rectifying portion of the rectifying member, and the flow velocity and / or flow rate of the fluid to be measured is measured based on the ultrasonic propagation time between the ultrasonic transducers. If dust adheres to the surface of the rectifying part, even if the pressure loss of the rectifying part is not large, the ultrasonic wave is affected by dust, and the ultrasonic wave does not reach the opposing ultrasonic transducer, making measurement impossible. Was produced.
特に、プロパンなどの水分を含まない帯電させやすいガスの測定においては、整流部分が帯電しやすく、整流部分の表面に塵埃が付着しやすいため、計測する流体に僅かでも塵埃が含まれると、測定不能になるという課題があった。 In particular, when measuring easily charged gas that does not contain moisture, such as propane, the rectifying part is easily charged, and dust tends to adhere to the surface of the rectifying part. There was a problem of becoming impossible.
本発明は、前記従来の課題を解決するもので、帯電しやすい整流部分を、流路と電気的に導通させる導通手段を設けることにより、塵埃の影響を受けない高性能な超音波振動子を用いた流体の流れ計測装置を提供することを目的とする。 The present invention solves the above-described conventional problems, and provides a high-performance ultrasonic transducer that is not affected by dust by providing conductive means for electrically connecting a rectifying portion that is easily charged to a flow path. An object is to provide a fluid flow measuring device used.
上記課題を解決するため本発明の流体の流れ計測装置は、被測定流体が流れる流路の上流側と下流側に少なくとも一対配置した超音波振動子と、前記超音波振動子間に配設した被測定流体の流れを整流する整流部材とを備え、前記整流部材は、少なくとも流れに対し略並行でかつ超音波振動子から発信される超音波を遮らないように配設した整流板と、前記整流板を保持する樹脂製のケースと、前記整流板の側部の位置し前記ケースに設けた超音波振動子から発信される超音波を通過させる開口からなるとともに、少なくとも前記整流板に帯電防止手段を設け、かつ前記超音波振動子間の超音波伝搬時間にもとづいて前記被測定流体の流速および／または流量を測定するようにした構成としたものである。 In order to solve the above problems, a fluid flow measuring device of the present invention is disposed between at least a pair of ultrasonic transducers disposed upstream and downstream of a flow path through which a fluid to be measured flows, and the ultrasonic transducer. A rectifying member that rectifies the flow of the fluid to be measured, the rectifying member being at least substantially parallel to the flow and disposed so as not to block the ultrasonic wave transmitted from the ultrasonic transducer, a resin case for holding the rectifying plate, it becomes an opening for passing the ultrasonic wave transmitted from ultrasonic vibrator disposed at a position above the case side of the rectifying plate, antistatic at least the rectifier plate It means provided, and wherein is obtained a configuration which is adapted to measure the flow rate and / or flow rate of the fluid to be measured based on the ultrasonic propagation time between ultrasonic sound wave transducer.
また、被測定流体が流れる流路の上流側と下流側に少なくとも一対配置した超音波振動子と、前記超音波振動子間に配設した被測定流体の流れを整流する整流部材とを備え、前記整流部材は、少なくとも流れに対し略並行でかつ超音波振動子から発信される超音波を遮らないように配設した金属製の整流板と、前記整流板を保持する樹脂製のケースと、前記整流板の側部の位置し前記ケースに設けた超音波振動子から発信される超音波を通過させる開口からなるとともに、前記整流板と前記流路を電気的に導通する導通手段を設け、かつ前記超音波振動子間の超音波伝搬時間にもとづいて前記被測定流体の流速および／または流量を測定するようにした構成としたものである。 And an ultrasonic transducer disposed at least a pair on the upstream side and the downstream side of the flow path through which the fluid to be measured flows, and a rectifying member that rectifies the flow of the fluid to be measured disposed between the ultrasonic transducers, the rectifying member includes a metal rectifying plate that is disposed so as not to block the ultrasonic waves transmitted from at least substantially parallel a and the ultrasonic vibrator to the flow, and resin case for holding the rectifying plate, The opening is located on the side of the rectifying plate and allows an ultrasonic wave transmitted from the ultrasonic vibrator provided in the case to pass therethrough, and conductive means for electrically connecting the rectifying plate and the flow path is provided. And it is set as the structure which measured the flow velocity and / or flow volume of the said to-be-measured fluid based on the ultrasonic propagation time between the said ultrasonic transducer | vibrators.
上記した構成により、超音波振動子間に被測定流体の流れを整流する流れに対し略並行で、かつ、超音波振動子から発信される超音波を遮らないように配設した整流板を有する整流部材を配設しているので、流体の流量を安定して正確に計測することができ、少なくとも整流板に帯電防止手段を設け、あるいは、整流板と流路を電気的に導通する導通手段を設けているので、整流板の帯電を防止でき、整流板に測定流体に含まれる塵埃などの異物が付着を低減することによって、長期に安定して、被測定流体の流速および／または流量を測定することができるようになる。 With the configuration described above, the flow control device has a flow straightening plate disposed between the ultrasonic transducers so as to be substantially parallel to the flow of rectifying the flow of the fluid to be measured and so as not to block the ultrasonic waves transmitted from the ultrasonic transducers. Since the rectifying member is provided, the flow rate of the fluid can be measured stably and accurately, and at least a rectifying plate is provided with an antistatic means, or a conducting means for electrically connecting the rectifying plate and the flow path. Therefore, the current plate can be prevented from being charged, and the flow rate and / or flow rate of the fluid to be measured can be stabilized stably over a long period of time by reducing the adhesion of foreign matter such as dust contained in the measurement fluid to the current plate. It becomes possible to measure.
更に、超音波振動子間に配設した被測定流体の流れを整流する整流部材の少なくとも流れに対し略並行でかつ超音波振動子から発信される超音波を遮らないように配設した整流板近傍に、被測定流体が流れる際に、その摩擦で整流板を帯電させようとするが、少なくとも整流板に設けた帯電防止手段によって、あるいは整流板の電荷が、整流板と流路を電気的に導通する導通手段によって、流路にアースされるので、整流板の帯電を防止できるようになる。特に、流れる被測定流体が、プロパンなどの水分を含まない帯電させやすい被測定流体であっても、同様で、被測定流体に含まれる塵埃などの異物が整流板に付着したとしても、帯電による保持力がないため、被測定流体の流れによって吹き流されてしまい、整流板の表面にたまることがなくなる。そのため、整流板が帯電して、被測定流体に含まれる塵埃などの異物が付着することによって、超音波が塵埃の影響を受け、相対する超音波振動子に超音波が到達せず、測定不能となる現象を防止することができるようになる。 Further, a rectifying plate disposed so as to be substantially parallel to at least the flow of the rectifying member for rectifying the flow of the fluid to be measured disposed between the ultrasonic transducers and not to block the ultrasonic waves transmitted from the ultrasonic transducers. When the fluid to be measured flows in the vicinity, the friction tries to charge the rectifying plate, but at least the anti-static means provided on the rectifying plate or the electric charge of the rectifying plate electrically connects the rectifying plate and the flow path. Since the flow path is grounded by the conduction means that conducts to the current path, charging of the rectifying plate can be prevented. In particular, even when the fluid to be measured is a fluid to be measured that does not contain moisture, such as propane, which is easy to be charged, similarly, even if foreign matter such as dust contained in the fluid to be measured adheres to the current plate, Since there is no holding force, it is blown off by the flow of the fluid to be measured and does not accumulate on the surface of the current plate. Therefore, when the current plate is charged and foreign matter such as dust contained in the fluid to be measured adheres, the ultrasonic waves are affected by the dust, and the ultrasonic waves do not reach the opposing ultrasonic transducer, making measurement impossible. It becomes possible to prevent this phenomenon.
本発明によれば、超音波振動子間に配設した被測定流体の流れを整流する整流部材を構成する整流板の帯電を防止して、被測定流体に含まれる塵埃などの異物の影響を受けないようにすることができ、長期に安定して、より信頼性の高い流れ計測装置を提供することができるようになる。 According to the present invention, the rectifying plate that constitutes the rectifying member that rectifies the flow of the fluid to be measured disposed between the ultrasonic transducers is prevented from being charged, and the influence of foreign matters such as dust contained in the fluid to be measured is prevented. Therefore, it is possible to provide a highly reliable flow measurement device that is stable over a long period of time.
第１の発明による流体の流れ計測装置は、被測定流体が流れる流路の上流側と下流側に少なくとも一対配置した超音波振動子と、前記超音波振動子間に配設した被測定流体の流
れを整流する整流部材とを備え、前記整流部材は、少なくとも流れに対し略並行でかつ超音波振動子から発信される超音波を遮らないように配設した整流板と、前記整流板を保持する樹脂製のケースと、前記整流板の側部の位置し前記ケースに設けた超音波振動子から発信される超音波を通過させる開口からなるとともに、前記整流板と前記流路を電気的に導通する導通手段を設け、かつ前記超音波振動子間の超音波伝搬時間にもとづいて前記被測定流体の流速および／または流量を測定するようにした構成としたものである。
According to a first aspect of the present invention, there is provided a fluid flow measuring device comprising: at least a pair of ultrasonic transducers disposed upstream and downstream of a flow path through which a fluid to be measured flows; and a fluid to be measured disposed between the ultrasonic transducers. A rectifying member that rectifies the flow, and the rectifying member holds the rectifying plate at least substantially parallel to the flow and disposed so as not to block the ultrasonic wave transmitted from the ultrasonic transducer. A resin- made case and an opening that is located on a side of the rectifying plate and allows an ultrasonic wave transmitted from an ultrasonic transducer provided in the case to pass therethrough, and electrically connects the rectifying plate and the flow path. conducting means for conducting disposed, and wherein is obtained a configuration which is adapted to measure the flow rate and / or flow rate of the ultrasonic transducer between the ultrasonic the fluid to be measured based on the propagation time.
第２の発明による流体の流れ計測装置は、被測定流体が流れる流路の上流側と下流側に少なくとも一対配置した超音波振動子と、前記超音波振動子間に配設した被測定流体の流れを整流する整流部材とを備え、前記整流部材は、少なくとも流れに対し略並行でかつ超音波振動子から発信される超音波を遮らないように配設した金属製の整流板と、前記整流板を保持する樹脂製のケースと、前記整流板の側部の位置し前記ケースに設けた超音波振動子から発信される超音波を通過させる開口からなるとともに、前記整流板と前記流路を電気的に導通する導通手段を設け、かつ前記超音波振動子間の超音波伝搬時間にもとづいて前記被測定流体の流速および／または流量を測定するようにした構成としたものである。 According to a second aspect of the present invention, there is provided a fluid flow measuring device comprising: at least a pair of ultrasonic transducers disposed upstream and downstream of a flow path through which a fluid to be measured flows; and a fluid to be measured disposed between the ultrasonic transducers. A rectifying member that rectifies the flow, wherein the rectifying member is at least substantially parallel to the flow and disposed so as not to block the ultrasonic wave transmitted from the ultrasonic transducer, and the rectifying member a resin case for holding the plate, it becomes an opening for passing the ultrasonic wave transmitted from ultrasonic vibrator disposed at a position above the case side of the rectifying plate, the flow path and the rectifying plate It provided conducting means for electrically conducting, and wherein is obtained a configuration which is adapted to measure the flow rate and / or flow rate of the ultrasonic transducer between the ultrasonic the fluid to be measured based on the propagation time.
そして、超音波振動子間に被測定流体の流れを整流する流れに対し略並行で、かつ、超音波振動子から発信される超音波を遮らないように配設した整流板を有する整流部材を配設しているので、流体の流量を安定して正確に計測することができ、少なくとも整流板に帯電防止手段を設け、あるいは、整流板と流路を電気的に導通する導通手段を設けているので、整流板の帯電を防止でき、整流板に測定流体に含まれる塵埃などの異物が付着を低減することによって、長期に安定して、被測定流体の流速および／または流量を測定することができるようになる。 And a rectifying member having a rectifying plate disposed substantially in parallel with the flow of rectifying the flow of the fluid to be measured between the ultrasonic vibrators and not blocking the ultrasonic waves transmitted from the ultrasonic vibrators. Since it is arranged, the flow rate of the fluid can be measured stably and accurately, and at least a rectifying plate is provided with an antistatic means, or a conducting means for electrically connecting the rectifying plate and the flow path is provided. Therefore, charging of the current plate can be prevented, and the flow rate and / or flow rate of the fluid to be measured can be measured stably over a long period of time by reducing the adhesion of foreign matter such as dust contained in the measured fluid to the current plate. Will be able to.
更に、超音波振動子間に配設した被測定流体の流れを整流する整流部材の少なくとも流れに対し略並行でかつ超音波振動子から発信される超音波を遮らないように配設した整流板近傍に、被測定流体が流れる際に、その摩擦で整流板を帯電させようとするが、少なくとも整流板に設けた帯電防止手段によって、あるいは整流板の電荷が、整流板と流路を電気的に導通する導通手段によって、流路にアースされるので、整流板の帯電を防止できるようになる。 Further, a rectifying plate disposed so as to be substantially parallel to at least the flow of the rectifying member for rectifying the flow of the fluid to be measured disposed between the ultrasonic transducers and not to block the ultrasonic waves transmitted from the ultrasonic transducers. When the fluid to be measured flows in the vicinity, the friction tries to charge the rectifying plate, but at least the anti-static means provided on the rectifying plate or the electric charge of the rectifying plate electrically connects the rectifying plate and the flow path. Since the flow path is grounded by the conduction means that conducts to the current path, charging of the rectifying plate can be prevented.
特に、流れる被測定流体が、プロパンなどの水分を含まない帯電させやすい被測定流体であっても、同様で、被測定流体に含まれる塵埃などの異物が整流板に付着したとしても、帯電による保持力がないため、被測定流体の流れによって吹き流されてしまい、整流板の表面にたまることがなくなる。そのため、整流板が帯電して、被測定流体に含まれる塵埃などの異物が付着することによって、超音波が塵埃の影響を受け、相対する超音波振動子に超音波が到達せず、測定不能となる現象を防止することができるようになる。 In particular, even when the fluid to be measured is a fluid to be measured that does not contain moisture, such as propane, which is easy to be charged, similarly, even if foreign matter such as dust contained in the fluid to be measured adheres to the current plate, Since there is no holding force, it is blown off by the flow of the fluid to be measured and does not accumulate on the surface of the current plate. Therefore, when the current plate is charged and foreign matter such as dust contained in the fluid to be measured adheres, the ultrasonic waves are affected by the dust, and the ultrasonic waves do not reach the opposing ultrasonic transducer, making measurement impossible. It becomes possible to prevent this phenomenon.
第３の発明による流体の流れ計測装置は、特に、第２の発明の整流板と流路を電気的に導通する導通手段を、前記整流板の一部に前記ケースを貫通する貫通部を設け、前記貫通部と流路を電気的に導通させる接触手段を設けた構成としたものである。 The fluid flow measuring device according to the third invention is particularly provided with a conduction means for electrically conducting the flow rectifying plate and the flow path of the second invention, and a through portion penetrating the case in a part of the rectifying plate. The contact means for electrically connecting the through portion and the flow path is provided.
そして、整流板と流路を電気的に導通する導通手段を、前記整流板の一部に前記ケースを貫通する貫通部を設け、前記貫通部と流路を電気的に導通させる導電性のスポンジやスプリングなどで構成された接触手段を設けているので、複数枚の整流板に簡単な構成で、確実に、流路に電気的に導通させることができるようになる。 And a conductive sponge for electrically connecting the flow rectifying plate and the flow path; a conductive sponge for providing a through portion that penetrates the case in a part of the flow rectifying plate; Since the contact means constituted by a spring or the like is provided, the plurality of current plates can be reliably electrically connected to the flow path with a simple configuration.
第４の発明による流体の流れ計測装置は、特に、第２の発明の整流板と流路を電気的に導通する導通手段を、整流板の一部に前記ケースを貫通させ前記流路と整流板が直接接触
するように形成した構成としたものである。
The fluid flow measuring device according to the fourth aspect of the invention is characterized in that, in particular, a conducting means for electrically conducting the rectifying plate and the flow path of the second invention is formed by passing the case through a part of the rectifying plate and rectifying the flow path and the flow path. The structure is such that the plates are in direct contact.
そして、整流板と流路を電気的に導通する導通手段を、整流板の一部に前記ケースを貫通させ前記流路と整流板が直接接触するように形成しているので、他の部品を必要とせず、構成が簡単になり、安価に整流板と流路を電気的に導通する導通手段を構成することができる。 And since the conduction means for electrically conducting the rectifying plate and the flow path is formed so that the case passes through a part of the rectifying plate and the flow path and the rectifying plate are in direct contact with each other, It is not necessary, the configuration is simplified, and a conduction means for electrically conducting the current plate and the flow path can be configured at low cost.
第５の発明による流体の流れ計測装置は、特に、第２の発明の整流板と流路を電気的に導通する導通手段を、整流板を保持する樹脂製のケースを導電材料で形成した構成としたものである。 Fifth flow measuring device of the fluid of the aspect of the invention is, in particular, a conducting means for electrically connecting the rectifying plate and the flow path of the second invention, to form a resin case for holding the rectifying plate with a conductive material structure It is what.
そして、整流板と流路を電気的に導通する導通手段を、整流板を保持する樹脂製のケースを導電材料で形成しているので、整流板に帯電する電荷は、整流板を保持する導電材料で形成したケースを介して、流路にアースされるようになり、他の部品を必要とせず、構成が簡単になり、また、その電気的な接触面積も広くなり、より確実に流路に電気的に導通させることができるようになる。 In addition, since the conductive case for electrically connecting the rectifying plate and the flow path is made of a conductive material and the resin case that holds the rectifying plate is formed, the electric charge charged to the rectifying plate is the electric conductivity that holds the rectifying plate. Through the case made of material, it is grounded to the flow path, no other parts are required, the configuration is simple, and its electrical contact area is widened, so the flow path is more reliable Can be made electrically conductive.
以下、本発明の実施の形態について、図面を参照しながら説明する。なお、本実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.
（実施の形態１）
図１は、本発明の実施の形態１の流体の流れ計測装置の要部断面図、図２は、上面配置図である。
(Embodiment 1)
FIG. 1 is a cross-sectional view of an essential part of a fluid flow measuring device according to Embodiment 1 of the present invention, and FIG.
図１、図２において、被測定流体の流量計測を行う水平に配設した流量計測流路１１の両端に、下方へつながる流入側配管１２および流出側配管１３が設けてあり、被測定流体は、流入側配管１２から取り込まれ、流量計測流路１１を介して、流出側配管１３へと排出される。超音波振動子１４、１５は、流量計測流路１１を挟むように上流側と下流側に一対にして配置してあり、この間の流量計測流路１１に被測定流体の流れを整流する整流部材１６が配置している。 In FIG. 1 and FIG. 2, an inflow side pipe 12 and an outflow side pipe 13 connected downward are provided at both ends of a horizontally arranged flow rate measurement channel 11 for measuring the flow rate of the fluid to be measured. Then, it is taken in from the inflow side pipe 12 and discharged to the outflow side pipe 13 through the flow rate measuring channel 11. The ultrasonic transducers 14 and 15 are arranged in a pair on the upstream side and the downstream side so as to sandwich the flow measurement channel 11, and a rectifying member that rectifies the flow of the fluid to be measured in the flow measurement channel 11 therebetween. 16 is arranged.
上記整流部材１６は少なくとも流れに対し略並行でかつ超音波振動子１４、１５から発信される超音波を遮らないように配設した金属製の複数枚の整流板１７と、整流板１７を保持する樹脂製のケース１８と、整流板１７の側部に位置し、前記ケース１８に設けた超音波振動子１４、１５から発信される超音波を通過させる開口１９から構成されている。 The rectifying member 16 holds a plurality of metal rectifying plates 17 disposed so as to be at least substantially parallel to the flow and not to block the ultrasonic waves transmitted from the ultrasonic transducers 14 and 15, and the rectifying plate 17. a resin case 18, located on the side of the current plate 17, and a opening 19 for passing the ultrasonic wave transmitted from the ultrasonic transducer 14, 15 provided in the casing 18.
また、整流板１７の一部には、ケース１８を貫通する貫通部２０を設け、この貫通部２０と流量計測流路１１とを電気的に導通させる導電材料からなる接触手段２１が配設している。 Further, a part of the rectifying plate 17 is provided with a penetrating portion 20 that penetrates the case 18, and contact means 21 made of a conductive material that electrically connects the penetrating portion 20 and the flow rate measuring channel 11 is disposed. ing.
このような配置において、流入側超音波振動子１４、１５と流出側超音波振動子１４、１５との距離をＬ、流入側の超音波振動子１４、１５から超音波を送信し、流出側の超音波振動子１４、１５で受信する時の伝播時間をＴｕｄ、その逆に、流出側の超音波振動子１４、１５から超音波を送信し、流入側の超音波振動子１４、１５で受信する時の伝播時間をＴｄｕとし、音速をＣ、流体の流速をＶｆとすると、次式が成り立つ。
Ｔｕｄ＝Ｌ／（Ｃ＋Ｖｆ）、Ｔｄｕ＝Ｌ／（Ｃ−Ｖｆ）
これより、Ｃ＋Ｖｆ＝Ｌ／Ｔｕｄ、Ｃ−Ｖｆ＝Ｌ／Ｔｄｕが成り立ち、その結果、
２・Ｖｆ＝（Ｌ／Ｔｕｄ）＋（Ｌ／Ｔｄｕ）となる。
よって、 Ｖｆ＝（Ｌ／２）［（１／Ｔｕｄ）−（１／Ｔｄｕ）］となる。
In such an arrangement, the distance between the inflow-side ultrasonic transducers 14 and 15 and the outflow-side ultrasonic transducers 14 and 15 is L, ultrasonic waves are transmitted from the inflow-side ultrasonic transducers 14 and 15, and the outflow side The transmission time when receiving by the ultrasonic transducers 14 and 15 is Tud, and conversely, ultrasonic waves are transmitted from the ultrasonic transducers 14 and 15 on the outflow side, and the ultrasonic transducers 14 and 15 on the inflow side are transmitted. If the propagation time when receiving is Tdu, the sound velocity is C, and the fluid flow velocity is Vf, the following equation is established.
Tud = L / (C + Vf), Tdu = L / (C−Vf)
From this, C + Vf = L / Tud, C-Vf = L / Tdu, and as a result,
2 · Vf = (L / Tud) + (L / Tdu).
Therefore, Vf = (L / 2) [(1 / Tud) − (1 / Tdu)].
このように、超音波伝播時間ＴｕｄおよびＴｄｕを計測することにより、流体の流速Ｖｆを計測することができる。なお、この流体の流速Ｖｆは、音速Ｃに依存せずに求めることができる。つまり、流体の温度変化によって流体中の音速が変化しても、計測結果に影響しないことがわかる。この流体の流速Ｖｆに、あらかじめ決められている流量計測流路１１の断面積Ｓを乗ずることにより流体の流量を、
Ｑｆ＝Ｓ・Ｖｆとして求めることができる。
Thus, the fluid flow velocity Vf can be measured by measuring the ultrasonic propagation times Tud and Tdu. The fluid flow velocity Vf can be obtained without depending on the sound velocity C. That is, it can be seen that even if the sound velocity in the fluid changes due to the temperature change of the fluid, the measurement result is not affected. By multiplying the flow velocity Vf of the fluid by a predetermined cross-sectional area S of the flow rate measuring channel 11, the flow rate of the fluid is obtained.
Qf = as S · Vf can seek Me Rukoto.
ここで、上記した構成により、超音波振動子１４、１５間に被測定流体の流れを整流する流れに対し略並行で、かつ、超音波振動子１４、１５から発信される超音波を遮らないように配設した金属製の複数枚の整流板１７を有する整流部材１６を配設しているので、流体の流量を安定して正確に計測することができ、整流板１７と前記流路を電気的に導通する導通手段として、整流板１７の一部に、ケース１８を貫通する貫通部２０を設け、この貫通部２０と流量計測流路を電気的に導通させる接触手段２１を設けているので、整流板１７の帯電を防止でき、整流板１７に測定流体に含まれる塵埃などの異物が付着することを低減することによって、長期に安定して、被測定流体の流速および／または流量を測定することができるようになる。 Here, with the configuration described above, the ultrasonic waves transmitted from the ultrasonic transducers 14 and 15 are not blocked in parallel with the flow of rectifying the flow of the fluid to be measured between the ultrasonic transducers 14 and 15. Since the rectifying member 16 having a plurality of metal rectifying plates 17 arranged as described above is provided, the flow rate of the fluid can be measured stably and accurately, and the rectifying plate 17 and the flow path are connected to each other. as conducting means for electrically conducting, a portion of the current plate 17, a through portion 20 passing through the casing 18 is provided, the through portion 20 and the flow rate measuring flow path contacting means 21 for electrically connecting the to set only Therefore, the current plate 17 can be prevented from being charged, and the flow rate and / or flow rate of the fluid to be measured can be stably stabilized over a long period of time by reducing the adhesion of foreign matter such as dust contained in the measurement fluid to the current plate 17. Will be able to measure
更に詳述すると、超音波振動子１４、１５間に配設した被測定流体の流れを整流する整流部材１６の少なくとも流れに対し略並行でかつ超音波振動子１４、１５から発信される超音波を遮らないように配設した金属製の複数枚の整流板１７の間に、被測定流体が流れる際に、その摩擦で整流板１７を帯電させようとするが、整流板１７の電荷が、整流板１７と流路を電気的に導通する接触手段２１によって、流路にアースされるので、整流板１７の帯電を防止できるようになる。 More specifically, the ultrasonic waves transmitted from the ultrasonic transducers 14 and 15 are substantially parallel to at least the flow of the rectifying member 16 that rectifies the flow of the fluid to be measured disposed between the ultrasonic transducers 14 and 15. When the fluid to be measured flows between the plurality of metal rectifying plates 17 arranged so as not to block the rectifying plate 17, the friction of the rectifying plate 17 is charged by the friction. Since the flow path is grounded by the contact means 21 that electrically connects the current plate 17 and the flow path, charging of the current plate 17 can be prevented.
特に、流れる被測定流体が、プロパンなどの水分を含まない帯電させやすい被測定流体であっても、同様で、被測定流体に含まれる塵埃などの異物が整流板１７に付着したとしても、帯電による保持力がないため、被測定流体の流れによって吹き流されてしまい、整流板１７の表面にたまることがなくなる。そのため、整流板１７が帯電して、被測定流体に含まれる塵埃などの異物が付着することによって、超音波が塵埃の影響を受け、相対する超音波振動子１４、１５に超音波が到達せず、測定不能となる現象を防止することができる。 In particular, even when the fluid to be measured is a fluid to be measured that does not contain moisture, such as propane, which is easy to be charged, similarly, even if foreign matter such as dust contained in the fluid to be measured adheres to the rectifying plate 17, it is charged. Since there is no holding force due to the above, it is blown off by the flow of the fluid to be measured and does not collect on the surface of the rectifying plate 17. Therefore, the current plate 17 is charged and foreign matter such as dust contained in the fluid to be measured adheres, so that the ultrasonic wave is affected by the dust and the ultrasonic wave reaches the opposing ultrasonic vibrators 14 and 15. Therefore, the phenomenon that the measurement becomes impossible can be prevented.
（実施の形態２）
図３は、本発明の実施の形態１の流体の流れ計測装置の上面配置図である。なお、本実施の形態は、実施の形態１で、整流板１７と流量計測流路１１を電気的に導通する導通手段が実施の形態１の発明と異なるだけで、同一の番号を付与し、異なる部分についてのみ説明を行う。
(Embodiment 2)
FIG. 3 is a top plan view of the fluid flow measuring device according to the first embodiment of the present invention. The present embodiment is the same as that of the first embodiment except that the conduction means for electrically conducting the rectifying plate 17 and the flow rate measurement channel 11 is different from that of the first embodiment. Only the differences will be described.
本実施の形態は、整流板１７と流量計測流路１１とを電気的に導通する導通手段を、整流板２２の一部に前記ケース１８を貫通させ前記流量計測流路１１と整流板２２とが貫通部２３で直接接触するように形成したものである。 In the present embodiment, a conducting means for electrically conducting the rectifying plate 17 and the flow rate measuring channel 11 is formed by passing the case 18 through a part of the rectifying plate 22 and the flow measuring channel 11 and the rectifying plate 22. Is formed so as to be in direct contact with the penetrating portion 23.
そして、整流板２２と流量計測流路１１とを電気的に導通する導通手段を、整流板２２の一部に前記ケース１８を貫通させ前記流量計測流路１１と整流板２２が貫通部２３で直接接触するように形成しているので、他の部品を必要とせず、構成が簡単になり、安価に整流板２２と流量計測流路１１を電気的に導通する導通手段を構成することができる。 Then, a conducting means for electrically conducting the rectifying plate 22 and the flow rate measuring channel 11 is inserted into the case 18 through a part of the rectifying plate 22 so that the flow rate measuring channel 11 and the rectifying plate 22 are connected to the through portion 23. Since it is formed so as to be in direct contact, other components are not required, the configuration is simplified, and a conduction means for electrically conducting the rectifying plate 22 and the flow rate measurement channel 11 can be configured at low cost. .
（実施の形態３）
図４は、本発明の実施の形態１の流体の流れ計測装置の要部断面図である。なお、本実施の形態は、実施の形態１で、整流板１７と流量計測流路１１を電気的に導通する導通手
段が実施の形態１の発明と異なるだけで、同一の番号を付与し、異なる部分についてのみ説明を行う。
(Embodiment 3)
FIG. 4 is a cross-sectional view of a main part of the fluid flow measuring device according to the first embodiment of the present invention. The present embodiment is the same as that of the first embodiment except that the conduction means for electrically conducting the rectifying plate 17 and the flow rate measurement channel 11 is different from that of the first embodiment. Only the differences will be described.
本実施の形態は、整流板１７と流量計測流路１１とを電気的に導通する導通手段を、整流板１７を保持する樹脂製のケース２４を導電材料で形成したものである。 This embodiment, in which the conducting means for electrically connecting the rectifying plate 17 and the flow rate measuring flow path 11, to form a resin case 24 holding the rectifying plate 17 with a conductive material.
そして、整流板１７と流量計測流路１１とを電気的に導通する導通手段を、整流板１７を保持する樹脂製のケース２３を導電材料で形成しているので、整流板１７に帯電する電荷は、整流板１７を保持する導電材料で形成したケース２４を介して、流量計測流路１１にアースされるようになり、他の部品を必要とせず、構成が簡単になり、また、その電気的な接触面積も広くなり、より確実に流量計測流路１１に電気的に導通させることができるようになる。 And since the resin- made case 23 which hold | maintains the rectification | straightening board 17 is formed with the electrically-conductive material as the conduction | electrical_connection means which electrically conducts the rectification | straightening board 17 and the flow-measurement flow path 11, the electric charge which charges the rectification | straightening board 17 Is grounded to the flow rate measurement flow path 11 through a case 24 formed of a conductive material that holds the rectifying plate 17, so that no other parts are required and the configuration is simplified. As a result, the contact area becomes larger, and the flow measurement channel 11 can be electrically connected more reliably.
尚、整流板１７と流量計測流路１１とを電気的に導通する導通手段は、整流板１７が帯電しないように電荷を流量計測流路１１にアースすることを目的とするため、整流板１７に帯電防止剤の塗布等の帯電防止処理を施しても同様な効果が得られ、その他各部の構成も本発明の目的を達成する範囲であればその構成はどのようなものであってもよい。 The conduction means for electrically conducting the rectifying plate 17 and the flow rate measuring channel 11 is intended to ground the charge to the flow rate measuring channel 11 so that the rectifying plate 17 is not charged. The same effect can be obtained even if antistatic treatment such as application of an antistatic agent is applied, and the configuration of each part may be any configuration as long as the object of the present invention is achieved. .
以上のように、本発明にかかる流体の流れ計測装置は、従来の超音波振動子間に配設した被測定流体の流れを整流する整流部材を構成する整流板の帯電を防止して、被測定流体に含まれる塵埃などの異物の影響を受けないようにすることができ、長期に安定して、より信頼性の高い流れ計測装置を提供することができるようになるので、ガスメータ等の用途に適用できる。 As described above, the fluid flow measuring device according to the present invention prevents charging of the rectifying plate that constitutes the rectifying member that rectifies the flow of the fluid to be measured disposed between the conventional ultrasonic transducers. It is possible to prevent the influence of foreign substances such as dust contained in the measurement fluid, and to provide a more reliable flow measurement device that is stable for a long period of time. Applicable to.
１１ 流量計測流路
１４、１５ 超音波振動子
１６ 整流部材
１７ 整流板
１９ 開口
２０ 貫通部
２１ 接触手段（導通手段）
DESCRIPTION OF SYMBOLS 11 Flow measurement flow path 14, 15 Ultrasonic vibrator 16 Rectification member 17 Rectification plate 19 Opening 20 Through part 21 Contact means (conduction means)
Claims (5)
The rectifying plate and conducting means for electrically connecting the flow path, the fluid flow measuring device as claimed in claim 2 formed with casing made of resin for holding the rectifying plate with a conductive material.
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