JP2898835B2 - Vortex flow meter - Google Patents
Vortex flow meterInfo
- Publication number
- JP2898835B2 JP2898835B2 JP35431192A JP35431192A JP2898835B2 JP 2898835 B2 JP2898835 B2 JP 2898835B2 JP 35431192 A JP35431192 A JP 35431192A JP 35431192 A JP35431192 A JP 35431192A JP 2898835 B2 JP2898835 B2 JP 2898835B2
- Authority
- JP
- Japan
- Prior art keywords
- vortex
- main body
- distance
- generator
- flowmeter
- 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
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- Measuring Volume Flow (AREA)
Description
【０００１】[0001]
【技術分野】本発明は、渦流量計に関し、より詳細に
は、同一呼び径の内径が各々異なる配管に取り付けられ
る渦流量計の渦発生体取付位置又は渦検出器の取付位置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex flowmeter, and more particularly, to a vortex generator mounting position or a vortex detector mounting position of a vortex flowmeter which is mounted on pipes having the same nominal diameter and different inner diameters.
【０００２】[0002]
【従来技術】渦流量計は、周知のように測定流体の流れ
る配管と同軸に取り付けられて流れにより流出する渦の
単位時間当りの数に基づいて流量を計測する推測形の流
量計である。渦流量計は、測定流体の物性に影響されず
に流量を測定できる簡易な流量計であり、気体、液体の
流量計測に広く使用されている。渦流量計は配管に取り
付ける本体と、該本体に、流れに面して軸対称に取り付
けられる渦発生体とから構成されるが、本体の形状は、
配管フランジにフランジ結合するフランジタイプと、配
管フランジ内に配設され、上下流側のフランジのフラン
ジ孔に挿通されるボルト等により圧接されるウェハータ
イプとがある。2. Description of the Related Art As is well known, a vortex flowmeter is a speculative flowmeter which is mounted coaxially with a pipe through which a measurement fluid flows and measures the flow rate based on the number of vortices flowing out per unit time. The vortex flowmeter is a simple flowmeter that can measure the flow rate without being affected by the physical properties of the measurement fluid, and is widely used for measuring the flow rates of gases and liquids. The vortex flowmeter is composed of a main body attached to a pipe, and a vortex generator attached to the main body in an axisymmetric manner facing the flow.
There are a flange type which is flange-connected to the pipe flange, and a wafer type which is provided in the pipe flange and is pressed into contact with a bolt or the like inserted into a flange hole of the upstream and downstream flanges.
【０００３】フランジタイプは主として大口径の渦流量
計に適用され規格に応じたフランジ、本体を有するが、
ウェハータイプは小口径の渦流量計に適用される。ウェ
ハータイプの渦流量計はフランジは有せずその分安価で
小形な渦流量計となるが、一方、取り付けられる配管の
管径は同一呼び径でも異なり、渦流量計の本体を定めて
おくと内径との間に段差が生じ、この段差によって器差
が変化するという問題がある。配管の肉厚や内径は、適
用する圧力による規格で定められている。例えば、呼び
径が５０Ａ（５０ｍｍ）の場合の管内径はＳＣＨ（スケ
ジュール）８０では４９.５ｍｍ、ＳＣＨ４０で５２.７
ｍｍ、ＳＣＨ２０では５４.１ｍｍとなっており、ＳＣ
Ｈ８０とＳＣＨ２０とで４.６ｍｍの差があり２.３ｍｍ
の段差が生ずる。[0003] The flange type is mainly applied to a large-diameter vortex flowmeter and has a flange and a main body according to the standard.
The wafer type is applied to a small-diameter vortex flowmeter. While vortex flowmeter wafer type flange becomes small vortex flowmeter correspondingly inexpensive without chromatic, while the tube diameter of the pipe to be attached differs even same nominal diameter, the previously determined the body of the vortex flowmeter There is a problem that a step is generated between the inner diameter and the inner diameter, and the step changes an instrumental difference. The wall thickness and the inner diameter of the pipe are determined by standards according to the applied pressure. For example, when the nominal diameter is 50 A (50 mm), the inner diameter of the pipe is 49.5 mm for the SCH (schedule) 80 and 52.7 for the SCH 40.
mm, SCH20, 54.1 mm, SC
There is a difference of 4.6mm between H80 and SCH20 and 2.3mm
Step occurs.
【０００４】渦流量計の本体内径も取り付ける配管の規
格に従って定めればよいが、同じ呼び径のスケジュール
管を取りあげるだけでも規格数は多く、スケジュール管
以外でもガス管等があり、これらの規格の配管を含める
と膨大な種類となり、在庫管理が繁雑になるだけでなく
コストが増大する。このため本体内径は、呼び径の中で
最も小径の配管内径と等しい寸法に定めておくと好都合
である。このような本体内径寸法をとる同一呼び径の規
格上、大口径の配管との段差は大きくなり渦流量計に流
入する流れは絞られるが、本体内径を大口径と一致させ
た逆の場合と比べて器差影響は小さくなることが実験に
より確かめられている。The inner diameter of the main body of the vortex flowmeter may be determined in accordance with the specification of the pipe to be attached. However, even if a schedule pipe having the same nominal diameter is selected, the number of specifications is large, and there are gas pipes other than the schedule pipe. Including the piping, the number of types becomes huge, which not only complicates inventory management but also increases costs. For this reason, it is convenient to determine the inner diameter of the main body to be equal to the inner diameter of the smallest pipe among the nominal diameters. According to the standard of the same nominal diameter that takes such an inner diameter of the main body, the step difference from the large-diameter pipe becomes large and the flow flowing into the vortex flowmeter is reduced, but it is the same as the reverse case where the inner diameter of the main body matches the large diameter. It has been confirmed by experiments that the influence of the instrumental difference is smaller than that of the first embodiment.
【０００５】しかし、ウェハータイプの渦流量計では本
体長さができるだけ短くする方が取り扱いも簡単で、小
形になり、安価となるが、本体を短くした場合の器差変
化が大きくなる。しかし、従来、最適となる本体長さ
や、渦発生体の取付寸法等の最適位置に関しては明確に
定められていなかった。However, in a wafer type vortex flowmeter, if the body length is made as short as possible, the handling becomes easier, the size becomes smaller, and the cost becomes lower. However, conventionally, the optimal position such as the optimal main body length and the mounting dimensions of the vortex generator has not been clearly defined.
【０００６】また、渦発生体の代表長さ、すなわち、流
れ方向からみた渦発生体の幅ｄと本体内径Ｄとの比ｄ／
Ｄは、通常一定に定められているが、該ｄ／Ｄの比が異
る一般の渦流量計で、渦検出器が渦発生体の下流に取り
付ける構造において、渦検出器の配設位置の距離が異な
ると器差変化が生ずるという問題があり、更に、渦流量
計本体の流路形状が円形ではなく、矩形断面の場合も、
同様に、渦検出器の配設位置の距離が異ると器差変化が
生ずるという問題があった。Also, the representative length of the vortex generator, that is, the ratio d / d of the width d of the vortex generator and the inner diameter D of the main body viewed from the flow direction.
D is usually fixed, but is a general vortex flow meter having a different d / D ratio. In a structure in which the vortex detector is mounted downstream of the vortex generator, the position of the vortex detector is determined. If the distance is different, there is a problem that the instrumental difference changes.In addition, even if the flow path shape of the vortex flowmeter body is not circular but has a rectangular cross section,
Similarly, if the distance between the positions of the vortex detectors is different, there is a problem that the instrumental difference changes.
【０００７】[0007]
【目的】本発明は、上述の問題点に鑑みてなされたもの
で、渦流量計本体内径と配管内径とに段差があった場
合、最も器差影響を小さくする渦発生体と本体との位置
関係を提供すること、或いは、ｄ／Ｄが異ったり、本体
断面が矩形で渦検出器が渦発生体の下流に取り付けた場
合に、器差影響が最も小さくなる渦発生体と検出器の位
置関係を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a position between a vortex generator and a main body that minimizes the influence of instrumental differences when there is a step between the vortex flowmeter main body inner diameter and the pipe inner diameter. To provide a relationship, or if the d / D is different, or if the body cross-section is rectangular and the vortex detector is mounted downstream of the vortex generator, the vortex generator and detector will have the least effect. The purpose is to provide a positional relationship.
【０００８】[0008]
【構成】本発明は、上記目的を達成するために、（１）
同じ呼び径で内径が各々異なる規格配管のフランジ間に
装着され、前記呼び径の配管で最小の管径を有する本体
と、該本体内に配設され渦間距離がａの渦を流出する渦
発生体とからなり、前記渦発生体の渦剥離点から前記本
体後流端までの距離Ｌ1を１.０a≧Ｌ 1 ≧０.８ａとした
こと、或いは、（２）測定流体が流れる本体と、該本体
に配設され渦間距離がａの渦を流出する渦発生体と、前
記本体の該渦発生体の後流側に配設され、該渦発生体の
渦を検出する検出器とからなる渦流量計において、前記
渦発生体の渦の剥離点から検出器までの距離Ｌ2を１.０
a≧Ｌ 2 ≧０.８ａとしたことを特徴とするものである。
以下、本発明の実施例に基づいて説明する。To achieve the above object, the present invention provides (1)
A main body having the same nominal diameter and a different inner diameter between flanges of standard pipes, the main body having the minimum pipe diameter of the nominal diameter pipe, and a vortex which is disposed in the main body and flows out a vortex having a vortex distance of a. A distance L 1 from the vortex separation point of the vortex generator to the downstream end of the main body is set to 1.0a ≧ L 1 ≧ 0.8a , or (2) a main body through which a measurement fluid flows. A vortex generator disposed in the main body for flowing out a vortex having a vortex distance of a, and a detector disposed on the downstream side of the vortex generator of the main body and detecting the vortex of the vortex generator In the vortex flow meter, the distance L 2 from the vortex separation point of the vortex generator to the detector is set to 1.0.
a ≧ L 2 ≧ 0.8a .
Hereinafter, a description will be given based on examples of the present invention.
【０００９】図１は、本発明における渦流量計の器差試
験結果の一例を説明するための流れ方向の断面図で、図
中、１は本体、２は渦発生体、３は剥離点、４は配管、
５，６は渦である。FIG. 1 is a cross-sectional view in the flow direction for explaining an example of an instrumental difference test result of a vortex flowmeter according to the present invention. In the drawing, 1 is a main body, 2 is a vortex generator, 3 is a separation point, 4 is a pipe,
5 and 6 are vortices.
【００１０】渦流量計はウェハータイプのもので、内径
Ｄが一様な長さＬの円筒体である本体１と、該本体１内
に、流れ方向Ｑからみた代表長さｄの渦発生体３が配設
されており、本体１は内径Ｄｐの配管４，４間に同軸に
装着されている。図において渦発生体２は、例えば、断
面三角形状で試験を行うために、上流側配置２Ａ、中心
配置２Ｂ、後測側配置２Ｃであらわされる位置に位置を
変えている。渦５，６は渦検出器（図示せず）により検
出される。渦検出器としては渦による熱変化、揚力変化
等を熱センサ、ひずみセンサ、光センサ、超音波センサ
等で検出可能であるが、ここではセンサの方式は問わな
い。The vortex flow meter is of a wafer type, and has a main body 1 which is a cylindrical body having a uniform inner diameter D and a length L, and a vortex generator having a representative length d in the main body 1 as viewed from the flow direction Q. The main body 1 is coaxially mounted between pipes 4 and 4 having an inner diameter Dp. In the figure, the position of the vortex generator 2 is changed to a position represented by an upstream arrangement 2A, a center arrangement 2B, and a rear measurement arrangement 2C, for example, in order to conduct a test with a triangular cross section. The vortices 5, 6 are detected by a vortex detector (not shown). As a vortex detector, a thermal change, a lift change, and the like due to a vortex can be detected by a heat sensor, a strain sensor, an optical sensor, an ultrasonic sensor, or the like, but the type of the sensor is not limited here.
【００１１】渦は、渦発生体２に流入する流体が、渦発
生体２に沿って流れる流れによって生ずる運動量変化の
大きい位置から剥離するもので、渦発生体の断面が三角
形状の場合はエッジ部３が剥離点となる。渦発生体２か
ら剥離し流出する渦５，６は、カルマンの安定渦条件に
従って、千鳥状に交互に発生し、一定の渦間距離ａをも
った渦列間距離Ｈを保った渦列を形成し乍ら流出する。
渦間距離ａは、単位時間当りに発生する渦の数、即ち、
渦周波数と、所定時間内に、例えば、基準タンク等の基
準容器に流入した流体から求めた流量に基づいて算出さ
れた単位時間当りの流速とから容易に求めることができ
る。A vortex separates a fluid flowing into the vortex generator 2 from a position where a momentum change caused by a flow flowing along the vortex generator 2 is large. When the cross section of the vortex generator is triangular, the vortex is an edge. The part 3 becomes a peeling point. The vortices 5 and 6 that separate and flow out of the vortex generator 2 are generated alternately in a staggered manner according to Kalman's stable vortex condition, and form a vortex street having a constant vortex row distance H and a constant vortex row distance H. Runs out while forming.
The inter-vortex distance a is the number of vortices generated per unit time, that is,
It can be easily obtained from the vortex frequency and the flow rate per unit time calculated based on the flow rate obtained from the fluid flowing into the reference container such as the reference tank within a predetermined time.
【００１２】[0012]
【表１】 [Table 1]
【００１３】表１は、図１の渦流量計により得られた配
管段差影響試験の結果であり、表中、Ｌ0は本体１の上
流端から渦発生体２の剥離点３までの距離、Ｌ1は剥離
点３から本体１の下流端までの距離をあらわす。Table 1 shows the results of the pipe level difference effect test obtained by the vortex flow meter of FIG. 1. In the table, L 0 is the distance from the upstream end of the main body 1 to the separation point 3 of the vortex generator 2, L 1 represents the distance from the peeling point 3 to the downstream end of the main body 1.
【００１４】試験に用いられた渦流量計は、呼び口径４
０ｍｍ（４０Ａ）、５０ｍｍ（５０Ａ）および１５０ｍ
ｍ（１５０Ａ）であり、試験流体は、通常の Air（空
気）及び Water（水）である。The vortex flowmeter used in the test has a nominal diameter of 4
0mm (40A), 50mm (50A) and 150m
m (150 A) and the test fluids are normal Air and Water.
【００１５】図２（ａ）,（ｂ）は、表１の試験結果に
基づく器差偏差Ｅを表わすグラフＡ，Ｂであり、（ａ）
図は測定流体が空気、（ｂ）図は水の器差偏差で、配管
４の内径Ｄｐと本体１の内径Ｄとが等しいＤｐ＝Ｄの場
合の器差を基準とし、この水に対する偏差（％）Ｅを縦
軸に、渦発生体２の剥離点３から本体１の下後端までの
距離Ｌ1と渦間距離ａとの比を横軸に示したものであ
る。FIGS. 2A and 2B are graphs A and B showing the instrumental error E based on the test results in Table 1, respectively.
The figure shows the measured fluid as air, and the figure (b) shows the instrumental deviation of water. The instrumental error when the internal diameter Dp of the pipe 4 is equal to the internal diameter D of the main body 1 is Dp = D. %) E is plotted on the vertical axis, and the ratio of the distance L1 from the separation point 3 of the vortex generator 2 to the lower rear end of the main body 1 and the distance a between the vortices is plotted on the horizontal axis.
【００１６】表１に示すように、渦流量計の呼び径は４
０Ａ，５０Ａおよび１５０Ａで各々異った口径であり、
本体１の内径Ｄと、配管内径Ｄｐとの比ｍ（絞り比）が
０.９１５〜０.９３９と異ってもＬ1／ａをパラメータ
にとると一本の特性として表わされ、流体の種類によら
ず変極点がＬ1／ａ＝０.８となる。ここでＥ0は、下流
側の段差がない値であり、上流側の段差により定まる。As shown in Table 1, the nominal diameter of the vortex flowmeter is 4
0A, 50A and 150A have different diameters,
Even if the ratio m (diaphragm ratio) between the inner diameter D of the main body 1 and the inner diameter Dp of the pipe is different from 0.915 to 0.939, it is expressed as one characteristic when L 1 / a is taken as a parameter. The inflection point is L 1 /a=0.8 irrespective of the type of. Here, E 0 is a value having no step on the downstream side, and is determined by the step on the upstream side.
【００１７】本出願人は、これを渦発生体２から流出す
る渦５２は６の渦間距離ａに着目して（Ｌ1／ａ）の無
次元数をパラメータにとると図２（ａ）,（ｂ）とな
る。（ａ）図の器差偏差曲線Ａの場合も（ｂ）図の器差
偏差Ｂの場合も折屈点の（Ｌ1／ａ）は０.８となる。す
なわち、本体１と配管４とに段差があっても剥離点３か
ら本体１の下流端までの距離Ｌ1を渦間距離ａの８０％
の距離、好ましくは、渦間距離ａと等しくすることによ
り段差の大きさに影響されず安定な器差が得られること
が判明した。According to the present applicant, the vortex 52 flowing out of the vortex generator 2 is focused on the inter-vortex distance a of 6, and takes a dimensionless number of (L 1 / a) as a parameter, as shown in FIG. , (B). The bending point (L 1 / a) is 0.8 both in the case of the instrument error deviation curve A in the figure (a) and in the case of the instrument error deviation B in the figure (b). That is, even if there is a step between the main body 1 and the pipe 4, the distance L1 from the separation point 3 to the downstream end of the main body 1 is set to 80% of the inter-vortex distance a.
It has been found that a stable instrumental difference can be obtained irrespective of the size of the step by making the distance equal to, preferably, the inter-vortex distance a.
【００１８】次に、渦信号検出器の取り付け位置に関し
ての試験結果について得られた結果について述べる。渦
信号の検出は渦発生体と一体に形成され、渦発生体に作
用する揚力等から検出する構造の渦発生体から流出した
渦を後流側で検出する別体構造とがある。別体構造の渦
検出器では、本体断面形状が円形のものでも矩形のもの
でも前記渦間距離ａと剥離点ａから渦検出器迄の距離Ｌ
2との関係（Ｌ2／ａ）の値が０.８以上、好ましくは１.
０以上の場合が器差偏差が小さいことが判明した。Next, a description will be given of the results obtained for the test results regarding the mounting position of the vortex signal detector. The detection of the vortex signal is integrally formed with the vortex generator, and there is a separate structure in which the vortex flowing out of the vortex generator is detected on the downstream side of the vortex generator. In a vortex detector having a separate structure, whether the cross-sectional shape of the main body is circular or rectangular, the distance a between the vortex and the distance L from the separation point a to the vortex detector are determined.
2 (L 2 / a) is 0.8 or more, preferably 1.
It was found that when the value was 0 or more, the instrumental error deviation was small.
【００１９】例えば、口径２００ｍｍの渦流量計におい
て、（Ｌ2／ａ）＝０.５のときがＥ0＝８.０％、（Ｌ2
／ａ）＝０.８のときは、１.５％、（Ｌ2／ａ）＝１.０
のときは、Ｅ0＝１.０％であった。すなわち渦間距離ａ
に着目して（Ｌ2／ａ）＝０.８以上の距離に渦検出器を
取り付けることにより本体断面形状に依存されることな
く一定の器差偏差が得られる。For example, in a vortex flowmeter having a diameter of 200 mm, when (L 2 /a)=0.5, E 0 = 8.0% and (L 2
/A)=0.8, 1.5%, (L 2 /a)=1.0
At the time of E, E 0 = 1.0%. That is, the vortex distance a
By attaching the vortex detector at a distance of (L 2 /a)=0.8 or more, a constant instrument difference deviation can be obtained without depending on the cross-sectional shape of the main body.
【００２０】[0020]
【効果】以上の説明から明らかなように、本発明による
と、渦流量計本体内径と、配管内径との間に段差があっ
ても、渦流量計本体の下流側端面と渦発生体の剥離点ま
での距離Ｌ1を、渦間距離ａの８０％以上の長さ（好ま
しくは１００％）、を選ぶことにより段差影響を受ける
ことが少なくすることができる。従って、呼び径が同じ
で規格の異なる配管であっても、同一寸法の本体とする
ことができるのでコスト低減を計ることができる。更
に、本体の断面形状が異っていても、渦検出器の取り付
け位置を渦間距離ａの８０％以上の位置に取り付けるこ
とにより器差偏差の小さい渦流量計とすることができ
る。As is apparent from the above description, according to the present invention, even if there is a step between the inner diameter of the vortex flowmeter main body and the inner diameter of the pipe, the separation of the vortex generator from the downstream end face of the vortex flowmeter main body. The influence of a step can be reduced by selecting the distance L 1 to the point to be a length (preferably 100%) of 80% or more of the inter-vortex distance a. Therefore, even if the pipes have the same nominal diameter and different standards, the main bodies can have the same dimensions, so that the cost can be reduced. Furthermore, even if the cross-sectional shape of the main body is different, by mounting the vortex detector at a position that is 80% or more of the vortex distance a, a vortex flowmeter with a small instrument difference deviation can be obtained.
【図１】 本発明における渦流量計の器差試験結果の一
例を説明するための流れ方向の断面図である。FIG. 1 is a cross-sectional view in the flow direction for explaining an example of an instrumental difference test result of a vortex flowmeter according to the present invention.
【図２】 表１の試験結果に基づく器差偏差Ｅを表わす
グラフＡ，Ｂである。FIGS. 2A and 2B are graphs A and B showing an instrumental error deviation E based on the test results in Table 1. FIGS.
１…本体、２…渦発生体、３…剥離点、４…配管、５，
６…渦。DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Vortex generator, 3 ... Peeling point, 4 ... Piping, 5,
6 ... vortex.
Claims (2)
のフランジ間に装着され、前記呼び径の配管で最小の管
径を有する本体と、該本体内に配設され渦間距離がａの
渦を流出する渦発生体とからなり、前記渦発生体の渦剥
離点から前記本体後流端までの距離Ｌ1を１.０a≧Ｌ 1 ≧
０.８ａとしたことを特徴とする渦流量計。1. A main body which is mounted between flanges of standard pipes having the same nominal diameter and different inner diameters, and has a minimum pipe diameter of the pipes of the nominal diameter, and a main body disposed in the main body and having a vortex distance of a. A vortex generator flowing out of the vortex, and a distance L 1 from a vortex separation point of the vortex generator to the downstream end of the main body is set to 1.0a ≧ L 1 ≧
A vortex flowmeter characterized by 0.8a .
され渦間距離がａの渦を流出する渦発生体と、前記本体
の該渦発生体の後流側に配設され、該渦発生体の渦を検
出する検出器とからなる渦流量計において、前記渦発生
体の渦の剥離点から検出器までの距離Ｌ2を１.０a≧Ｌ 2
≧０.８ａとしたことを特徴とする渦流量計。2. A main body through which a measurement fluid flows, a vortex generator disposed in the main body and flowing out of a vortex having a vortex distance of a, and a vortex generator disposed on the downstream side of the vortex generator of the main body, in the vortex flowmeter comprising a detector for detecting the vortex of the vortex generation body, 1.0a distance L 2 to the detector from the separation point of the vortex of the vortex generator ≧ L 2
A vortex flowmeter characterized by ≧ 0.8a .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35431192A JP2898835B2 (en) | 1992-12-14 | 1992-12-14 | Vortex flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35431192A JP2898835B2 (en) | 1992-12-14 | 1992-12-14 | Vortex flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06180243A JPH06180243A (en) | 1994-06-28 |
| JP2898835B2 true JP2898835B2 (en) | 1999-06-02 |
Family
ID=18436694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35431192A Expired - Lifetime JP2898835B2 (en) | 1992-12-14 | 1992-12-14 | Vortex flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2898835B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7082840B2 (en) * | 2003-11-03 | 2006-08-01 | Rosemount Inc. | Flanged vortex flowmeter with unitary tapered expanders |
| US9016138B2 (en) * | 2013-03-13 | 2015-04-28 | Rosemount Inc. | Flanged reducer vortex flowmeter |
| CN105891536A (en) * | 2016-03-31 | 2016-08-24 | 中山大学 | Small-hole wind field flow speed pressure intensity measuring instrument |
-
1992
- 1992-12-14 JP JP35431192A patent/JP2898835B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06180243A (en) | 1994-06-28 |
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