JPH0618244Y2 - Fluid vibration type flow meter - Google Patents
Fluid vibration type flow meterInfo
- Publication number
- JPH0618244Y2 JPH0618244Y2 JP1987153883U JP15388387U JPH0618244Y2 JP H0618244 Y2 JPH0618244 Y2 JP H0618244Y2 JP 1987153883 U JP1987153883 U JP 1987153883U JP 15388387 U JP15388387 U JP 15388387U JP H0618244 Y2 JPH0618244 Y2 JP H0618244Y2
- Authority
- JP
- Japan
- Prior art keywords
- flow
- fluid vibration
- flow rate
- vibration type
- flow meter
- 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.)
- Expired - Lifetime
Links
Description
【考案の詳細な説明】 ［産業上の利用分野］ 本考案は、流体振動型流量計（フルイディック流量計）
に関するものである。[Detailed Description of the Invention] [Industrial field of application] The present invention is a fluid vibration type flow meter (fluidic flow meter).
It is about.
［従来技術とその問題点］ 流体振動型流量計の場合、小流量を測定するためにはそ
の絞り部の断面積を小さくする必要があるが、このよう
に断面積を小さくすると圧力損失が大きくなる。この結
果、例えば都市ガスのようにガス器具の種火３/h〜ガ
ス瞬間湯沸器3,000/hというように流量変動幅の大き
い流体の測定用に適用するには実用上問題がある。[Prior art and its problems] In the case of a fluid vibration type flow meter, it is necessary to reduce the cross-sectional area of its throttle portion in order to measure a small flow rate. However, if the cross-sectional area is reduced in this way, pressure loss increases. Become. As a result, there is a practical problem in applying it to the measurement of a fluid having a large fluctuation range of flow rate, such as a gas appliance pilot fire 3 / h to a gas instantaneous water heater 3,000 / h, such as city gas.
第５図はこのような欠点を改善するために提案された公
知例を示すものである。FIG. 5 shows a known example proposed to remedy such drawbacks.
この公知例は流路０１の上流側に一定流量以上の流量を
測定する大流体振動型流量計０２を組み込むと共にこの
下流側には前記流量計０２より小さい流量を測定する小
流体振動型流量計０３を組み込み、一定流量以上の場合
にはバイパス弁０５を流路切替機構０４により開いて流
量計０２側で測定し、以下の場合には閉じて流量計０３
側で測定し、小流量域での測定を可能にしたものであ
る。In this known example, a large fluid vibration type flow meter 02 for measuring a flow rate above a certain flow rate is installed on the upstream side of the flow path 01, and a small fluid vibration type flow meter for measuring a flow rate smaller than the flow meter 02 on the downstream side. 03, the bypass valve 05 is opened by the flow path switching mechanism 04 to measure on the flow meter 02 side when the flow rate is equal to or higher than a certain flow rate, and closed in the following cases.
It is possible to measure in the small flow range by measuring on the side.
しかし、この公知例においては、流路切替機構０４の締
切性が悪いと測定誤差を生じ、また流量計０２と０３の
切り替えのタイミングが難しく、これが測定誤差とな
り、所謂許容される器差内に収めるのが困難である。さ
らに、流量計を２個及び切替機構等を組み込むために複
雑化、大型化してしまうと共に価格的にも高くなるとい
う問題もある。However, in this known example, if the shutoff property of the flow path switching mechanism 04 is poor, a measurement error occurs, and the switching timing of the flowmeters 02 and 03 is difficult, which results in a measurement error, which is within the so-called allowable instrumental error. Difficult to fit. Further, there is a problem that since the two flowmeters and the switching mechanism are incorporated, the flowmeter becomes complicated and large, and the cost also increases.
［本考案の目的］ 本考案は、流体振動型流量計において、簡単な手段によ
り小流量域での測定範囲を拡大することが目的である。[Object of the Invention] The object of the present invention is to expand the measurement range in a small flow rate range by a simple means in a fluid vibration type flowmeter.
［本考案の構成及びその作用］ 本考案は、上記目的を達成する技術手段として、次の如
き構成の流体振動型流量計を提案する。[Structure and Operation of the Present Invention] The present invention proposes a fluid vibration type flow meter having the following structure as a technical means for achieving the above object.
流体振動素子の絞り部に流速検出手段を取り付け、これ
によって検出された流速から流量を演算して低流量域で
の測定範囲を改善して成る流体振動型流量計。A fluid vibration type flow meter in which a flow velocity detecting means is attached to a throttle portion of a fluid vibration element, and a flow rate is calculated from the flow velocity detected by the flow velocity detecting means to improve a measurement range in a low flow rate region.
上記流量計においては、絞り部（ノズル部）に流速検出
手段として例えば熱式フローセンサを取り付け、このセ
ンサにより流量振動が発生しないかしにくいような小流
量時の流速を測定し、これから流量を演算するものであ
る。In the above flow meter, for example, a thermal type flow sensor is attached to the throttle section (nozzle section) as a flow rate detecting means, and the flow rate at a small flow rate is measured by this sensor so that the flow rate vibration is less likely to occur. It is something that is calculated.
［実施例及びその作用］ 第１図に本考案に係る流体振動型流量計を示す。[Examples and Operations] FIG. 1 shows a fluid vibration type flow meter according to the present invention.
符号の１は振動素子にして、２は絞り部、３はこの絞り
部２に組み込まれた熱式フローセンサにして、このセン
サ３により被測定流体の流速を測定し、この値を基に演
算器４にて次式の計算を行い、流量値を算出する。Reference numeral 1 is a vibrating element, 2 is a throttle portion, 3 is a thermal type flow sensor incorporated in the throttle portion 2, the flow velocity of the fluid to be measured is measured by this sensor 3, and calculation is performed based on this value. The flow rate value is calculated by calculating the following equation in the container 4.
Ｑ＝Ｓｖ 但し、Ｑ：流量 ｖ：流速 Ｓ：絞り部の断面積 ５はターゲット１１の下流側に配置された振動（圧力）
検出部にして、絞り部２から噴出した流体はコアンダ効
果によって、側壁６に沿った流れとなり、その流れがフ
ィードバック流路８の入口に達するとこの圧力がフィー
ドバック流路８を伝播して流れを側壁６′側に押しや
り、側壁６′に沿った流れに切り替える。そして、この
流れがフィードバック流路８′の入口に達するとこの圧
力がフィードバック流路８′を伝播して再び流れを側壁
６側に押しやる。この繰り返しが流体振動であり、この
流体振動は流量に比例している。したがって、この流体
振動を検出部５の検出孔９、９′により捕捉し、これを
導圧管１０、１０′を経由して流体振動検出センサ１２
に送り、検出孔９、９′間の差圧の変動周波数を測定す
ることにより流量値が求められる。Q = Sv, where Q: flow rate v: flow velocity S: cross-sectional area of throttle portion 5 is vibration (pressure) arranged on the downstream side of the target 11.
The fluid ejected from the throttle unit 2 in the detection unit becomes a flow along the side wall 6 due to the Coanda effect, and when the flow reaches the inlet of the feedback flow passage 8, this pressure propagates through the feedback flow passage 8 to cause the flow. It is pushed toward the side wall 6 ', and the flow is switched to the side wall 6'. When this flow reaches the inlet of the feedback channel 8 ', this pressure propagates through the feedback channel 8'and pushes the flow again toward the side wall 6 side. This repetition is fluid vibration, and this fluid vibration is proportional to the flow rate. Therefore, this fluid vibration is captured by the detection holes 9 and 9'of the detection unit 5, and the fluid vibration detection sensor 12 is passed through the pressure guiding tubes 10 and 10 '.
And the flow rate value is obtained by measuring the fluctuation frequency of the differential pressure between the detection holes 9 and 9 '.
図中１３は信号線である。In the figure, 13 is a signal line.
上記流量計においては流体振動による流量測定と熱式フ
ローセンサ３を使用した流量測定は同時に行われてお
り、この何れを表示するか或いは両者の平均値を表示す
るかは自由である。In the above flow meter, the flow rate measurement by the fluid vibration and the flow rate measurement using the thermal type flow sensor 3 are simultaneously performed, and which of them is displayed or the average value of the both is displayed freely.
但し、実施例の場合１５０/h以上の流量のときは、振
動素子１側で検出した流量測定値を優先している。However, in the case of the embodiment, when the flow rate is 150 / h or more, the flow rate measurement value detected on the vibration element 1 side is given priority.
第２図は流体振動素子の発振周波数と流量との関係（前
記のとおり流量に周波数は比例する）を示し、第３図は
熱式フローセンサ３を使用した場合の出力電圧と流量と
の関係（流量に電圧は比例する）を示し、第４図は本考
案を実施した流体振動型流量計の総合特性を示すもので
ある。FIG. 2 shows the relationship between the oscillation frequency of the fluid vibration element and the flow rate (the frequency is proportional to the flow rate as described above), and FIG. 3 shows the relationship between the output voltage and the flow rate when the thermal flow sensor 3 is used. (Voltage is proportional to flow rate) and FIG. 4 shows the overall characteristics of the fluid vibration type flow meter embodying the present invention.
［本考案の効果］ 本考案は以上のように、小流量については流速検出手段
で検出した流速から流量を演算して測定するようにした
ので、第３図からも明らかなように微小流量についても
測定が可能である。[Effects of the Invention] As described above, the invention calculates the flow rate from the flow velocity detected by the flow velocity detecting means for a small flow rate, and therefore, as shown in FIG. Can also be measured.
次に、熱式フローセンサの場合には絞り部において大き
な突出を伴なわないので、これによる圧力損失は小さ
く、実用上支障はない。Next, in the case of the thermal type flow sensor, since there is no large protrusion in the throttle portion, the pressure loss due to this is small and there is no practical problem.
次に、流速検出手段を組み込んだだけでは殆ど外形が大
きくなることもなく、構造も簡単なので故障の心配もな
く、コストも安い。Next, by incorporating the flow velocity detecting means, the outer shape hardly becomes large, and since the structure is simple, there is no fear of failure and the cost is low.
次に、従来例にみられたような切替機構等の可動部分が
ないので、このような可動部分に起因する測定誤差の発
生もない。Next, since there is no movable part such as the switching mechanism as seen in the conventional example, there is no occurrence of a measurement error due to such a movable part.
よって、本考案に係る流体振動型流量計は特に一般家庭
における都市ガス或いはプロパンガス等のメータとして
実用的であり、有効である。Therefore, the fluid vibration type flow meter according to the present invention is particularly practical and effective as a meter for city gas or propane gas in general households.
第１図は本考案に係る流体振動型流量計の斜視図、第２
図は流体振動素子の発振周波数と流量の関係を示すグラ
フ、第３図は熱式フローセンサにおける出力と流量の関
係を示すグラフ、第４図は本考案に係る流量計の総合特
性を示すグラフ、第５図は従来における流体振動型流量
計の説明図である。 １……流体振動素子、２……絞り部 ３……熱式フローセンサ、４……演算器 ５……検出端 １２……流体振動検出センサFIG. 1 is a perspective view of a fluid vibration type flow meter according to the present invention, and FIG.
Fig. 4 is a graph showing the relationship between the oscillation frequency of the fluid vibration element and the flow rate, Fig. 3 is a graph showing the relationship between the output and flow rate of the thermal flow sensor, and Fig. 4 is a graph showing the overall characteristics of the flowmeter according to the present invention. 5 is an explanatory view of a conventional fluid vibration type flow meter. 1 ... Fluid vibration element, 2 ... Throttle section 3 ... Thermal flow sensor, 4 ... Calculator 5 ... Detection end 12 ... Fluid vibration detection sensor
Claims (2)
り付け、これによって検出された流速から流量を演算し
て低流量域での測定範囲を改善して成る流体振動型流量
計。1. A fluid vibration type flow meter comprising a flow velocity detecting means attached to a narrowed portion of a fluid vibration element, and calculating a flow rate from the detected flow velocity to improve a measurement range in a low flow rate region.
実用新案登録請求の範囲第１項記載の流体振動型流量
計。2. A fluid vibration type flowmeter according to claim 1, wherein the flow velocity detecting means comprises a thermal type flow sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987153883U JPH0618244Y2 (en) | 1987-10-07 | 1987-10-07 | Fluid vibration type flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987153883U JPH0618244Y2 (en) | 1987-10-07 | 1987-10-07 | Fluid vibration type flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0158118U JPH0158118U (en) | 1989-04-11 |
| JPH0618244Y2 true JPH0618244Y2 (en) | 1994-05-11 |
Family
ID=31430116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987153883U Expired - Lifetime JPH0618244Y2 (en) | 1987-10-07 | 1987-10-07 | Fluid vibration type flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0618244Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2583452B2 (en) * | 1989-07-20 | 1997-02-19 | 東京瓦斯株式会社 | Composite flow meter |
| FR2663416B1 (en) * | 1990-06-14 | 1993-04-30 | Tokyo Gas Co Ltd | FLUID FLOW METER AND METHODS FOR CORRECTING THE ZERO POINT AND THE GAIN OF A FLOW SENSOR. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5672220U (en) * | 1979-11-07 | 1981-06-13 |
-
1987
- 1987-10-07 JP JP1987153883U patent/JPH0618244Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0158118U (en) | 1989-04-11 |
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