JPH0690059B2

JPH0690059B2 - Vortex flowmeter

Info

Publication number: JPH0690059B2
Application number: JP12933689A
Authority: JP
Inventors: 嘉彦谷村; 久人石黒; 靖夫多田
Original assignee: Mitsubishi Electric Corp; Mitsubishi Motors Corp
Current assignee: Mitsubishi Electric Corp; Mitsubishi Motors Corp
Priority date: 1989-05-23
Filing date: 1989-05-23
Publication date: 1994-11-14
Anticipated expiration: 2009-11-14
Also published as: JPH02307017A

Description

【発明の詳細な説明】〔産業上の利用分野〕この発明は車両等の内燃機関に用いられ、特に流れの乱
れの大きい流体を測定するための渦流量計に関するもの
である。Description: TECHNICAL FIELD The present invention relates to an eddy flow meter used for an internal combustion engine such as a vehicle, and particularly for measuring a fluid having a large flow turbulence.

[Conventional technology]

車両等の内燃機関に渦流量計が用いられる場合は、例え
ば特開昭58−21517号公報や特公昭62−26686号公報に開
示されているように、必らず機関のエアクリーナの下流
側に取付けられる。このような構成においては、流体の
流れの安定性が低いため低流量から高流量まで精度よく
計測できないという問題があった。このため、例えば特
開昭61−134620号公報では渦発生柱の上流側に流体の一
部に乱れを発生させる乱流発生体を配置し、渦の発生の
安定性向上を計ることが提案されている。When an eddy flow meter is used in an internal combustion engine of a vehicle or the like, as disclosed in, for example, JP-A-58-21517 and JP-B-62-26686, the eddy flow meter is always provided on the downstream side of the air cleaner of the engine. Mounted. In such a configuration, there is a problem in that it is not possible to accurately measure from a low flow rate to a high flow rate because the stability of the fluid flow is low. Therefore, for example, JP-A-61-134620 proposes to arrange a turbulent flow generator for generating turbulence in a part of the fluid on the upstream side of the vortex generation column to improve the stability of vortex generation. ing.

[Problems to be Solved by the Invention]

しかしながら、上記による方法では例えば特開昭57−67
863号公報に記述してあるように乱流発生体は渦発生柱
によって決まるべき渦周波数、すなわち流量特性を補正
できるほどの強い影響を有しているため、乱流発生体が
発生する渦が柱状でかつ、周期的ないわゆるカルマン渦
になりやすい場合、渦発生体で流量特性に与える影響が
大きいので、乱流発生体の形状寸法や配置精度を厳しく
要求されていた。However, in the method according to the above, for example, JP-A-57-67
As described in Japanese Patent No. 863, the turbulent flow generator has a strong influence that can correct the vortex frequency that should be determined by the vortex generation column, that is, the flow rate characteristic. When a columnar and periodic so-called Karman vortex is likely to occur, the vortex generator has a great influence on the flow rate characteristics, so that the dimensional and arrangement accuracy of the turbulence generator are strictly required.

この発明は上記のような課題を解決するためになされた
もので、安定した渦発生が得られると共に、安価で高精
度な渦流量計を得ることを目的とする。The present invention has been made to solve the above problems, and an object thereof is to obtain a stable vortex generation and to obtain an inexpensive and highly accurate vortex flowmeter.

[Means for Solving the Problems]

この発明に係る渦流量計は、被測定流体の流れる導管を
有し、この導管内に渦発生柱と、導管の被測定流体の入
口側にハニカム状あるいは網目状の整流器と、この整流
器の上流側で上記導管の入口側端部に上記被測定流体を
絞り込む絞り部材とを備えた渦流量計において、上記整
流器の入口面側に上記渦発生柱の中心軸線上で、かつこ
れと平行に被測定流体の流れを阻害する乱流発生体を配
置し、この乱流発生体と上記絞り部材とを一体成形した
ものである。The vortex flowmeter according to the present invention has a conduit through which a fluid to be measured flows, a vortex generating column, a honeycomb or mesh rectifier on the inlet side of the fluid to be measured in the conduit, and an upstream of the rectifier. Side of the vortex flowmeter provided with a throttle member for narrowing down the fluid to be measured at the inlet side end of the conduit, the inlet surface side of the rectifier on the central axis of the vortex generating column and in parallel with the vortex generating column. A turbulent flow generator that obstructs the flow of the measurement fluid is arranged, and the turbulent flow generator and the throttle member are integrally molded.

[Work]

この発明においては、渦発生柱の上流側に乱流発生体を
設けたことで、流体の一部に乱流を発生させ、これによ
って、渦発生柱の下流に生じるカルマン渦を安定化し、
揺らぎの少ない渦を得ることができる。In the present invention, by providing the turbulent flow generator on the upstream side of the vortex generating column, turbulent flow is generated in a part of the fluid, thereby stabilizing the Karman vortex generated downstream of the vortex generating column,
You can get a vortex with less fluctuation.

〔Example〕

以下、この発明の一実施例を図について説明する。第１
図はこの発明による渦流量計の横断平面図、第２図は第
１図のII−II線断面図、第３図は渦流量計を流体入口側
より見た正面図、第４図は第１図のIV−IV線断面図であ
って、各図において、渦流量計は主導管１と副導管２と
からなる。３は主導管１内に配置した渦発生柱で、上流
側渦発生柱31と下流側渦発生柱32から構成されている。
４は上記主導管１の流体入口側の開口部に取付けたハニ
カム形状の整流器、７は副導管２の流体入口側の開口部
に取付けた同じくハニカム形状の整流器で、これら整流
器4,7は固定部材5bおよびリベット６によって支持され
ている。5aは上記整流器４の入口面側で、上記渦発生柱
３の中心と一致した位置にあり、かつこれと平行に設け
た乱流発生体、5cは上記固定部材5bおよび乱流発生体5a
と一体的に設けられ、上記副導管７の通路断面積を規制
する調整部材、5eは上記乱流発生体5aと一体成形され、
被測定流体の流れを絞り込む絞り部材である。An embodiment of the present invention will be described below with reference to the drawings. First
1 is a cross-sectional plan view of the vortex flowmeter according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a front view of the vortex flowmeter as seen from the fluid inlet side, and FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, in which the vortex flowmeter comprises a main conduit 1 and a subsidiary conduit 2. Reference numeral 3 denotes a vortex generating column disposed in the main conduit 1, which is composed of an upstream vortex generating column 31 and a downstream vortex generating column 32.
4 is a honeycomb rectifier attached to the fluid inlet side opening of the main conduit 1, 7 is a honeycomb rectifier attached to the fluid inlet side opening of the auxiliary conduit 2, and these rectifiers 4 and 7 are fixed. It is supported by the member 5b and the rivet 6. 5a is a turbulent flow generator provided on the inlet face side of the rectifier 4 at a position coinciding with the center of the vortex generating column 3 and in parallel with it, and 5c is the fixing member 5b and the turbulent flow generator 5a.
An adjusting member that is provided integrally with the turbulent flow generator 5a and that regulates the passage cross-sectional area of the sub-conduit 7,
It is a throttle member that narrows down the flow of the fluid to be measured.

次に動作について説明する。第１図において、流体がF₁
〜F₃で示す流れを有していると、主導管１内の渦発生柱
３の直上流の流体はf₁,f₂₁,f₂₂,f₃に示す流れとなり、
渦発生柱３の後流にカルマン渦ｖが発生する。ここで、
乱流発生体5aがない場合は破線で示す流体f₂が流体f₁,f
₃と平行に生じることになるが、乱流発生体5aが存在す
ると流体F₂は乱流発生体5aの直後より乱れが発生する。
そして、流体f₂₁,f₂₂で囲まれる領域Ｅは乱流域であ
る。Next, the operation will be described. In FIG. 1, the fluid is F ₁
~ F ₃ has a flow, the fluid immediately upstream of the vortex generating column 3 in the main conduit 1 becomes a flow indicated by f ₁ , f ₂₁ , f ₂₂ and f ₃ ,
A Karman vortex v is generated in the wake of the vortex generating column 3. here,
Fluid f ₁ fluid f ₂ indicated by a broken line when there is no turbulence generator 5a, f
_When the turbulent flow generator 5a is present, the fluid F ₂ is turbulent immediately after the turbulent flow generator 5a.
A region E surrounded by the fluids f ₂₁ and f ₂₂ is a turbulent flow region.

渦発生柱３に衝突する流体に乱れがあるとカルマン渦が
発生しやすいことは周知のことである。ここで、上記し
た乱流域Ｅの乱流状態を説明する。乱流発生体5aの後流
の渦は流れに対して直角断面では渦柱状となる。また渦
はいわゆるカルマン渦である。しかし、乱流発生体5aの
直後の整流器４によって直角断面方向に流れが分断され
るため、第４図に示すvf₂に示す流速分布にて明らかな
ように渦柱はくずされる。したがって乱流域Ｅ内は流れ
に平行面および直角面のいずれの方向にも乱れることに
なる。このため、乱流発生体5aの発生する乱流が渦発生
柱３のカルマン渦発生のトリガ的要素となるのみで、渦
発生柱３のカルマン発生周期に大きく拘わることがな
い。したがって、乱流発生体5aの幅寸法ｄが多少変化し
ても渦発生柱３によって決定されるカルマン渦発生周期
を乱すことがないため、乱流発生体5aの寸法精度を高め
る必要はなくなる。It is well known that Karman vortices are easily generated when the fluid colliding with the vortex generating column 3 is disturbed. Here, the turbulent flow state of the turbulent flow region E will be described. The vortex of the wake of the turbulent flow generator 5a becomes a vortex column in a cross section perpendicular to the flow. The vortex is the so-called Karman vortex. However, since the flow is divided in the direction of the right-angled cross section by the rectifier 4 immediately after the turbulent flow generator 5a, the vortex column is broken as apparent from the flow velocity distribution indicated by vf ₂ in FIG. Therefore, the inside of the turbulent flow region E is disturbed in both directions parallel to and perpendicular to the flow. Therefore, the turbulent flow generated by the turbulent flow generator 5a serves only as a trigger element for the Karman vortex generation of the vortex generation column 3, and is not largely concerned with the Karman generation cycle of the vortex generation column 3. Therefore, even if the width dimension d of the turbulent flow generator 5a is slightly changed, the Karman vortex generation period determined by the vortex generation column 3 is not disturbed, and it is not necessary to improve the dimensional accuracy of the turbulent flow generator 5a.

ここで、第５図に乱流発生体5aの寸法ｄと渦発生柱３の
寸法Ｄによるカルマン渦の発生周期の安定性すなわち、
渦の揺らぎ率を示す。この図から実線はこの発明による
d/Dと揺らぎ率変化を示し、破線は従来装置による揺ら
ぎ率を示す。Here, in FIG. 5, the stability of the generation period of the Karman vortex depending on the dimension d of the turbulent flow generator 5a and the dimension D of the vortex generating column 3, that is,
The fluctuation rate of the vortex is shown. From this figure the solid line is according to the invention
d / D and fluctuation rate are shown, and the broken line shows fluctuation rate by the conventional device.

また、第２図および第３図で明らかなように乱流発生体
5aは渦流量計の副導管２の通路断面積を規制する調整部
材5cおよび絞り部材5eと一体に作られている。この調整
部材5cは渦流量計の流量特性を略平行的に移行させる機
能を有し、一般的に用いられるものであり、第３図に示
すように幅ｈが調整寸法となる。一方、絞り部材5eは整
流器４の上流における被測定流体に偏流が大きく、第２
図に示す流体F₇においては絞り部材5eで阻止し、流体F₆
に示すように流れ方向を流体F₄,F₅と略平行になるよう
に変更させると共に、流速を増加させる作用が得られ
る。また、乱流発生体5aを絞り部材5eと一体成形させる
と、乱流発生体5aを支持するための支持部材は不要とな
り、また、乱流発生体としての特別な部材を用意する必
要もない。さらに、調整部材5cや整流器4,7を固定する
固定部材5bとも一体成形すれば部品点数を大幅に少なく
でき製作および組立てが容易となる。In addition, as is clear from FIG. 2 and FIG.
The reference numeral 5a is integrally formed with an adjusting member 5c and a throttle member 5e for restricting the passage sectional area of the auxiliary conduit 2 of the vortex flowmeter. The adjusting member 5c has a function of shifting the flow rate characteristics of the vortex flowmeter substantially in parallel and is generally used, and the width h is an adjustment dimension as shown in FIG. On the other hand, the throttle member 5e has a large drift in the fluid to be measured upstream of the rectifier 4,
The fluid F ₇ shown in the figure is blocked by the throttling member 5e, and the fluid F ₆
As shown in, the flow direction can be changed so as to be substantially parallel to the fluids F ₄ and F _5, and the action of increasing the flow velocity can be obtained. Further, when the turbulent flow generator 5a is integrally formed with the throttle member 5e, a support member for supporting the turbulent flow generator 5a is unnecessary, and it is not necessary to prepare a special member as the turbulent flow generator. . Furthermore, if the adjusting member 5c and the fixing member 5b that fixes the rectifiers 4 and 7 are integrally formed, the number of parts can be significantly reduced, and the manufacturing and assembling becomes easy.

なお、実施例では整流器4,7はハニカム形状のものを使
用した例について説明したが、その他、網目状の整流器
であっても上記同様の作用が得られる。In addition, although the example in which the rectifiers 4 and 7 have a honeycomb shape is used in the embodiment, the same operation as described above can be obtained with a mesh rectifier.

〔The invention's effect〕

以上説明したようにこの発明によれば、導管の入口開口
部に設けた整流器の入口面側で渦発生柱の中心軸線上に
被測定流体の流れを阻害する乱流発生体を備え、この乱
流発生体と被測定流体を導管内へ案内する絞り部材とを
一体成形したことにより、流量特性が乱流発生体の寸法
精度によって大きく影響を受けることなく、しかも渦発
生柱の上流の流れに乱れがあっても渦の揺らぎの少ない
高精度で安価な渦流量計が得られる。また、絞り部材の
形成により、導管内へ流体を円滑に導くと共に流速を増
大させることができる。また、乱流発生体と絞り部材と
を一体成形したことで、部品点数を削減し製作および組
立ての工数を軽減できる。As described above, according to the present invention, the turbulent flow generator, which obstructs the flow of the fluid to be measured, is provided on the central axis of the vortex generating column on the inlet face side of the rectifier provided at the inlet opening of the conduit. By integrally molding the flow generator and the throttle member that guides the fluid to be measured into the conduit, the flow characteristics are not significantly affected by the dimensional accuracy of the turbulence generator, and the flow upstream of the vortex generating column is not affected. A highly accurate and inexpensive vortex flowmeter with less vortex fluctuation even if there is turbulence can be obtained. Further, by forming the throttle member, it is possible to smoothly guide the fluid into the conduit and increase the flow velocity. Moreover, since the turbulent flow generator and the throttle member are integrally formed, the number of parts can be reduced and the number of manufacturing and assembling steps can be reduced.

[Brief description of drawings]

第１図はこの発明の一実施例による渦流量計の横断平面
図、第２図は第１図のII−II線断面図、第３図は渦流量
計を入口側から見た正面図、第４図は第１図のIV−IV線
断面図、第５図は渦の揺らぎ率の特性図である。１……主導管、２……副導管、３……渦発生柱、4,7…
…整流器、5a……乱流発生体、5e……絞り部材。なお、図中同一符号は同一又は相当部分を示す。1 is a cross-sectional plan view of a vortex flowmeter according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a front view of the vortex flowmeter as viewed from the inlet side. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 is a characteristic diagram of the fluctuation rate of the vortex. 1 ... Main conduit, 2 ... Sub conduit, 3 ... Vortex generating column, 4,7 ...
... Rectifier, 5a ... Turbulence generator, 5e ... Throttling member. The same reference numerals in the drawings indicate the same or corresponding parts.

───────────────────────────────────────────────────── フロントページの続き (72)発明者多田靖夫兵庫県姫路市千代田町840番地三菱電機株式会社姫路製作所内 (56)参考文献特開昭61−134620（ＪＰ，Ａ) 特開昭63−180819（ＪＰ，Ａ) 実開昭61−99014（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Tada 840 Chiyoda-cho, Himeji City, Hyogo Prefecture Mitsubishi Electric Corporation Himeji Works (56) References JP 61-134620 (JP, A) JP 63- 180819 (JP, A) Actually opened Sho 61-99014 (JP, U)

Claims

[Claims]

1. A vortex generating column having a conduit through which a fluid to be measured flows, a honeycomb or mesh rectifier on the inlet side of the fluid to be measured of the conduit, and the conduit on the upstream side of the rectifier. In a vortex flowmeter equipped with a throttle member that narrows down the fluid to be measured at the inlet side end of the flow path of the fluid to be measured on the central axis of the vortex generating column at the inlet surface side of the rectifier and in parallel therewith. A vortex flowmeter characterized in that a turbulent flow generator that obstructs the above is disposed, and the turbulent flow generator and the throttle member are integrally molded.