JP3106449B2 - Flowmeter - Google Patents
FlowmeterInfo
- Publication number
- JP3106449B2 JP3106449B2 JP05084242A JP8424293A JP3106449B2 JP 3106449 B2 JP3106449 B2 JP 3106449B2 JP 05084242 A JP05084242 A JP 05084242A JP 8424293 A JP8424293 A JP 8424293A JP 3106449 B2 JP3106449 B2 JP 3106449B2
- Authority
- JP
- Japan
- Prior art keywords
- passage
- branch passage
- heat exchange
- branch
- central
- 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 - Fee Related
Links
Landscapes
- Measuring Volume Flow (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は流体の流量を検出する流
量計に関し、特に流体が流れる主通路内に分岐通路を形
成し、この分岐通路内を流れる流体の流量を計測する流
量計に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flowmeter for detecting a flow rate of a fluid, and more particularly to a flowmeter for forming a branch passage in a main passage through which a fluid flows and measuring the flow rate of the fluid flowing in the branch passage.
【０００２】[0002]
【従来の技術】従来、この種の流量計として、例えば特
開昭５６−１０８９１０号公報、特開昭５７−１０３０
１６号公報に開示されているものが知られている。特開
昭５６−１０８９１０号公報に開示される流量計は、主
通路入口または分岐通路入口だけに空気緩衝部材を設置
することにより吸入空気流の乱流、脈流を防止してい
る。2. Description of the Related Art Conventionally, as this type of flow meter, for example, Japanese Patent Application Laid-Open Nos. Sho 56-108910 and
The one disclosed in Japanese Patent No. 16 is known. The flow meter disclosed in JP-A-56-108910 prevents turbulence and pulsation of the intake air flow by installing an air buffer member only at the entrance of the main passage or the entrance of the branch passage.
【０００３】また、特開昭５７−１０３０１６号公報に
開示される流量計は、主通路入口に整流部材を設置する
ことにより吸入空気流を流路の軸方向の層流に矯正して
いる。The flow meter disclosed in Japanese Patent Application Laid-Open No. 57-103016 corrects an intake air flow into a laminar flow in an axial direction of a flow path by installing a rectifying member at an inlet of a main passage.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、特開昭
５６−１０８９１０号公報のものでは、主通路入口に空
気緩衝部材を設置する場合、吸気抵抗が増大してエンジ
ン馬力の低下を招き、分岐通路入口だけに空気緩衝部材
を設置する場合、分岐通路への分流比の低下を招くとい
う問題がある。However, according to Japanese Patent Application Laid-Open No. Sho 56-108910, when an air buffer member is installed at the entrance of the main passage, the intake resistance increases and the engine horsepower decreases. In the case where the air buffer member is provided only at the inlet, there is a problem that the ratio of the flow to the branch passage is reduced.
【０００５】特開昭５７−１０３０１６号公報のもので
は、主通路入口に整流部材を設置するため、特開昭５６
−１０８９１０号公報のものと同様に、吸気抵抗が増大
してエンジン馬力の低下を招くという問題がある。本発
明は、このような問題点を解決するためになされたもの
で、流体の分岐通路への分流比の低下を低減し、分岐通
路内の流体の整流効果を増大するとともに流体の温度分
布を均一化し、正確な流量計測を行える流量計を提供す
ることを目的とする。In Japanese Unexamined Patent Publication No. Sho 57-103016, a straightening member is installed at the entrance of the main passage.
As in the case of -108910, there is a problem that the intake resistance increases and the engine horsepower decreases. The present invention has been made in order to solve such a problem, and it is possible to reduce a decrease in a branching ratio of a fluid to a branch passage, increase a flow rectifying effect of the fluid in the branch passage, and reduce a temperature distribution of the fluid. It is an object of the present invention to provide a flow meter capable of performing uniform and accurate flow measurement.
【０００６】[0006]
【課題を解決するための手段】前記の目的を達成するた
めに本発明の流量計は、流体が流通する主通路を有する
樹脂製の筒体と、前記主通路のほぼ中央部に設けられる
中央部材と、前記主通路の壁面と前記中央部材とを連結
し、前記中央部材を前記主通路のほぼ中央に支持する支
持部材と、前記中央部材に開口し前記主通路を流れる流
体の一部を導入する導入口と、前記中央部材に形成さ
れ、前記導入口から導入された流体を流す分岐通路と、
この分岐通路の前記導入口の近傍下流に形成され、この
分岐通路を流れる流体の方向にこの分岐通路を複数の通
路に仕切る仕切り壁を有する熱交換部材と、この熱交換
部材の下流の分岐通路内に設けられるとともに、前記熱
交換部材の設けられる分岐通路の流路断面積よりも小さ
い流路断面積を有する分岐通路内に設けられ、この分岐
通路内の流量を計測する流速測定用抵抗体と、前記中央
部材の所定部位に開口し、前記分岐通路を流れた流体を
再び前記主通路に戻す出口とを備えたことを特徴とす
る。In order to achieve the above object, a flow meter according to the present invention comprises a resin cylinder having a main passage through which a fluid flows, and a center provided substantially at the center of the main passage. A member, a support member that connects the wall of the main passage and the central member, and supports the central member at substantially the center of the main passage, and a part of the fluid that opens in the central member and flows through the main passage. An introduction port to be introduced, a branch passage formed in the central member, and for flowing the fluid introduced from the introduction port,
A heat exchange member formed downstream of the branch passage near the introduction port and dividing the branch passage into a plurality of passages in a direction of a fluid flowing through the branch passage; and a branch passage downstream of the heat exchange member. And a flow rate measuring resistor that is provided in a branch passage having a flow passage cross-sectional area smaller than the flow passage cross-sectional area of the branch passage provided with the heat exchange member, and measures a flow rate in the branch passage. And an outlet opening at a predetermined portion of the central member and returning the fluid flowing through the branch passage to the main passage again.
【０００７】[0007]
【作用】本発明の前記構成をもつ流量計によると、導入
口の近傍下流に熱交換部材を設けるとともに熱交換部材
が設けられる分岐通路の流路断面積よりも小さい流路断
面積を有する分岐通路にセンサを設けることにより、分
岐通路内の流体の乱流が整流され、温度分布が均一化さ
れかつ分流比の低下が低減されるため、分岐通路内に設
けられたセンサにより正確な流量計測が可能になる。According to the flowmeter having the above-described structure, the heat exchange member is provided downstream in the vicinity of the inlet, and the branch having a smaller flow passage cross-sectional area than the branch passage in which the heat exchange member is provided. By providing a sensor in the passage, the turbulent flow of the fluid in the branch passage is rectified, the temperature distribution is made uniform, and the decrease in the branch ratio is reduced. Becomes possible.
【０００８】[0008]
【実施例】以下、自動車のエンジンに吸入される吸入空
気量を計測する熱式の空気流量計に本発明を適用した一
実施例を図１および図２に基づいて説明する。空気流量
計１０の上流側開口部２１３は図示しないエアクリーナ
に挿入され、取り付けられる。一方、下流側開口部３１
３は、空気流量計１０より大径の図示しない吸気ダクト
に挿入され、図示しないベルトにより外周から締めつけ
られる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a thermal air flow meter for measuring the amount of intake air taken into an automobile engine will be described below with reference to FIGS. The upstream opening 213 of the air flow meter 10 is inserted and attached to an air cleaner (not shown). On the other hand, the downstream opening 31
3 is inserted into an intake duct (not shown) having a diameter larger than that of the air flow meter 10, and is tightened from the outer periphery by a belt (not shown).
【０００９】流量計１０は、吸気通路を形成する中央円
筒部１００と上流側円筒部２００と下流側円筒部３００
とを備えている。分岐通路を形成する繭状の中央部材１
４は、吸気通路の長手方向ほぼ中央に設けられる。中央
部材１４は、中央ハウジング１６０と下流ハウジング３
６０と上流ハウジング４００とを備えている。樹脂製の
中央円筒部１００の外側には、後述する熱式センサ部５
００の制御回路１１４を収容する回路容器１１０が一体
に形成され、蓋が被せられる。中央円筒部１００の内側
は円筒状に成形され、内側へ向けてリブ１２０、１３
０、１４０および１５０が一体に成形されている。ただ
し、リブ１２０、１３０は図示しない。さらに、リブ１
２０、１３０、１４０および１５０の先端には円筒状の
中央ハウジング１６０が一体に成形されている。中央ハ
ウジング１６０はその中央に仕切り壁１６３を有し、仕
切り壁１６３の中央には穴１６５が開口されている。The flow meter 10 includes a central cylindrical portion 100, an upstream cylindrical portion 200, and a downstream cylindrical portion 300 which form an intake passage.
And Cocoon-shaped central member 1 forming a branch passage
4 is provided substantially at the center in the longitudinal direction of the intake passage. The central member 14 includes a central housing 160 and a downstream housing 3.
60 and an upstream housing 400. Outside the resin-made central cylindrical portion 100, a thermal sensor portion 5 described later is provided.
The circuit container 110 accommodating the control circuit 114 is formed integrally and covered with a lid. The inside of the central cylindrical portion 100 is formed into a cylindrical shape, and ribs 120 and 13 are directed inward.
0, 140 and 150 are integrally formed. However, the ribs 120 and 130 are not shown. Furthermore, rib 1
Cylindrical central housing 160 is integrally formed at the tips of 20, 130, 140 and 150. The central housing 160 has a partition wall 163 at the center thereof, and a hole 165 is opened at the center of the partition wall 163.
【００１０】樹脂製の上流側円筒部２００は絞り部２０
０ａから下流側へ向けて徐々に内側断面積が公がる形状
に形成され、上流側端部にはベルマウス部２１０が形成
され、外壁にはエアクリーナへの取付用の段差が形成さ
れ、この段差部にエアクリーナ気密用の弾性体７０３が
取付けられている。そして、上流側円筒部２００は中央
円筒部１００に固定される。The upstream cylindrical portion 200 made of resin is
0a, the inner cross-sectional area is gradually formed toward the downstream side, a bell mouth portion 210 is formed at the upstream end, and a step for attachment to the air cleaner is formed at the outer wall. An elastic body 703 for air-tightness is attached to the step. The upstream cylindrical portion 200 is fixed to the central cylindrical portion 100.
【００１１】ベルマウス部２１０は、エアクリーナとの
接続部においてベルマウス形状となっており、上流側円
筒部２００と樹脂により一体に形成されている。このた
め、ベルマウス部２１０の内壁には段差、突起、隙間等
のない滑らかな形状となっている。これにより、エアク
リーナからの空気の流れは、ベルマウス形状により段差
等の抵抗がなく滑らかに導かれ、下流側にいくに従い絞
られることにより整流される。この整流された流れによ
り発生した負圧により分岐管４２０、計測管４３０を経
由して出口開口部４４０から分岐流れが吸い出されるた
め、分岐通路内の後述する流速測定用抵抗体であるヒー
タ５７０および温度補償用抵抗体である温度計５８０の
出力変動を低減することができ、かつ圧力損失を低減さ
せることができる。The bell mouth portion 210 has a bell mouth shape at a connection portion with the air cleaner, and is formed integrally with the upstream cylindrical portion 200 by resin. Therefore, the inner wall of the bell mouth portion 210 has a smooth shape without steps, protrusions, gaps, and the like. Thereby, the flow of the air from the air cleaner is smoothly guided without resistance such as a step due to the bell mouth shape, and is rectified by being throttled toward the downstream side. Since the branch flow is sucked out of the outlet opening 440 via the branch pipe 420 and the measurement pipe 430 by the negative pressure generated by the rectified flow, the heater 570 which is a flow rate measuring resistor described later in the branch passage is provided. In addition, output fluctuation of the thermometer 580 which is a resistor for temperature compensation can be reduced, and pressure loss can be reduced.
【００１２】樹脂製の下流側円筒部３００は、図示しな
い吸気ダクトに挿入される直管部３１０が形成され、中
央円筒部１００の下流側端部に固定される。下流側円筒
部３００の内側は円筒状に成形され、その内側には、椀
状の下流ハウジング３６０が一体に成形されている。下
流ハウジング３６０は、中央円筒部１００に支持される
中央ハウジング１６０の下流側を閉塞し、下流に向かっ
て径が次第に小さくなるように滑らかな砲弾型の形状に
組立てられる。The downstream cylindrical section 300 made of resin has a straight pipe section 310 inserted into an intake duct (not shown), and is fixed to the downstream end of the central cylindrical section 100. The inside of the downstream side cylindrical portion 300 is formed into a cylindrical shape, and a bowl-shaped downstream housing 360 is integrally formed inside the inside. The downstream housing 360 closes the downstream side of the central housing 160 supported by the central cylindrical portion 100, and is assembled in a smooth shell shape so that the diameter gradually decreases toward the downstream side.
【００１３】中央円筒部１００に支持される中央ハウジ
ング１６０の上流側には、砲弾型の樹脂製の上流ハウジ
ング４００が挿入され固定される。上流ハウジング４０
０の上流側中央には入口開口部４１０が開口され、入口
開口部４１０の直後に熱交換部材１５が上流ハウジング
４００と一体に形成される。熱交換部材１５は、例えば
図２に示す熱交換部材１５の横断面図のように、熱交換
部材１５の外壁１５ａと互いに直行する仕切り壁１５ｂ
とで囲まれる貫通孔１５ｃを有する構造体で形成され
る。この構造体の貫通孔１５ｃを流れる空気流と平行な
面の延長が、ヒータ５７０および温度計５８０に向かう
ように形成される。熱交換部材１５に続いて下流へ向け
て直線的に延びる分岐管４２０が一体に成形されてい
る。On the upstream side of the central housing 160 supported by the central cylindrical portion 100, a shell-shaped upstream housing 400 made of resin is inserted and fixed. Upstream housing 40
An inlet opening 410 is opened at the center of the upstream side of the housing 0, and the heat exchange member 15 is formed integrally with the upstream housing 400 immediately after the inlet opening 410. The heat exchange member 15 has a partition wall 15b perpendicular to the outer wall 15a of the heat exchange member 15 as shown in a cross-sectional view of the heat exchange member 15 shown in FIG.
And a structure having a through hole 15c surrounded by. An extension of a plane parallel to the airflow flowing through the through hole 15c of the structure is formed so as to face the heater 570 and the thermometer 580. A branch pipe 420 that extends linearly downstream from the heat exchange member 15 is integrally formed.
【００１４】分岐管４２０の下流側には、計測管４３０
が挿入されている。計測管４３０はステンレス製の内側
管４３３と樹脂製の外側管４３５とからなり、内側管４
３３の上流部４３８にはベルマウスが形成され、内側管
４３３の内径は分岐管４２０より小径に形成されてい
る。計測管４３０の下流端は、中央ハウジング１６０の
内側に放射状に形成された４枚の板状のリブ１６７、１
６８、１６９、１７０の上流側端面に当接する。ただ
し、リブ１６８、１７０は図示しない。これにより、計
測管４３０の下流端と中央ハウジング１６０の仕切り壁
１６３との間に所定の隙間が形成され、しかも、計測管
４３０の下流端から出口開口部４４０への空気通路が形
成される。Downstream of the branch pipe 420 is a measuring pipe 430.
Is inserted. The measuring tube 430 includes an inner tube 433 made of stainless steel and an outer tube 435 made of resin.
A bell mouth is formed in the upstream portion 438 of the pipe 33, and the inner diameter of the inner pipe 433 is smaller than that of the branch pipe 420. The downstream end of the measuring tube 430 is provided with four plate-shaped ribs 167, 1 formed radially inside the central housing 160.
68, 169 and 170 are in contact with the upstream end surfaces. However, the ribs 168 and 170 are not shown. As a result, a predetermined gap is formed between the downstream end of the measurement pipe 430 and the partition wall 163 of the central housing 160, and an air passage is formed from the downstream end of the measurement pipe 430 to the outlet opening 440.
【００１５】さらに、仕切り壁１６３の穴１６５には、
下流側から熱式センサ部５００が挿入され、熱式センサ
部５００は仕切り壁１６３に固定される。熱式センサ部
５００は、円筒状の樹脂部５１０に４本の支持ピン５２
０、５３０、５４０、５５０を樹脂部５１０の上流側、
下流側とに突出するようにインサート成形して形成され
る。上流側に突出した支持ピンは長短２種類からなり、
長い２本５２０、５３０の間にヒータ５７０が支持さ
れ、短い２本５４０、５５０の間に温度計５８０が支持
される。ヒータ５７０および温度計５８０は、セラミッ
ク製ボビンの外周に白金線を巻き、ボビン両端のリード
線と接続したもので、同一特性の感温抵抗体が用いられ
る。Further, in the hole 165 of the partition wall 163,
The thermal sensor section 500 is inserted from the downstream side, and the thermal sensor section 500 is fixed to the partition wall 163. The thermal sensor section 500 includes four support pins 52 on a cylindrical resin section 510.
0, 530, 540 and 550 on the upstream side of the resin portion 510;
It is formed by insert molding so as to project to the downstream side. There are two types of support pins protruding upstream, long and short,
A heater 570 is supported between two long wires 520 and 530, and a thermometer 580 is supported between two short wires 540 and 550. The heater 570 and the thermometer 580 are formed by winding a platinum wire around the outer periphery of a ceramic bobbin and connected to lead wires at both ends of the bobbin, and use temperature-sensitive resistors having the same characteristics.
【００１６】さらに、中央ハウジング１６０と下流ハウ
ジング３６０との間に形成される空間と、回路容器１１
０との間には、リブ１４０内を通して導電部材が配設さ
れており、この導電部材は、熱式センサ部５００の下流
側に突出した支持ピンに図示せぬフレキシブル配線板を
介して接続される。従って、回路容器１１０内に収容さ
れた制御回路１１４は、導電部材とフレキシブル配線板
と支持ピンとを介して熱式センサ部５００に接続され
る。Further, a space formed between the central housing 160 and the downstream housing 360 and the circuit container 11
0, a conductive member is disposed through the inside of the rib 140, and the conductive member is connected to a support pin projecting downstream of the thermal sensor unit 500 via a flexible wiring board (not shown). You. Therefore, the control circuit 114 accommodated in the circuit container 110 is connected to the thermal sensor unit 500 via the conductive member, the flexible wiring board, and the support pins.
【００１７】図１の矢印Ａ方向から上記構成の流量計１
０に流入する空気は、上流側円筒部２００と中央円筒部
１００と下流側円筒部３００との内側に形成される吸気
通路を通過する。また、この吸気通路を流れる空気の一
部は、中央部材１４の内側に形成される分岐通路へ流入
する。この分岐通路へ流入する空気は、入口開口部４１
０から熱交換部材１５を通過する。このとき、流入する
空気に乱流があると、熱交換部材１５の貫通孔１５ｃを
通過するとき、乱流が整流される。また、エンジンの発
熱、エアクリーナからの熱伝導あるいはエアクリーナイ
ンレットにおける温度分布の影響により、例えば、流入
する空気が入口開口部４１０の内壁４１０ａから入口開
口部４１０の中心部に向かって温度が低下しているよう
な温度分布を有することがある。このような場合、ヒー
タ５７０と温度計５８０との間に温度差が生じ、この温
度差によって誤差が発生してしまう恐れがある。The flow meter 1 having the above configuration is viewed from the direction of arrow A in FIG.
The air flowing into 0 passes through an intake passage formed inside the upstream cylindrical portion 200, the central cylindrical portion 100, and the downstream cylindrical portion 300. A part of the air flowing through the intake passage flows into a branch passage formed inside the central member 14. The air flowing into this branch passage is supplied to the entrance opening 41.
From 0 passes through the heat exchange member 15. At this time, if there is turbulence in the inflowing air, the turbulence is rectified when passing through the through hole 15c of the heat exchange member 15. Also, due to the heat generated by the engine, the heat conduction from the air cleaner, or the influence of the temperature distribution at the air cleaner inlet, for example, the temperature of the flowing air decreases from the inner wall 410a of the inlet opening 410 toward the center of the inlet opening 410. Temperature distribution. In such a case, a temperature difference occurs between the heater 570 and the thermometer 580, and this temperature difference may cause an error.
【００１８】しかしながら、上記のように熱交換部材１
５は、内部に直行する仕切り壁１５ｂで囲まれる複数の
貫通孔１５ｃを有するため、熱交換部材１５内を流れる
空気と熱交換部材１５の内壁面との接触面積が大きい。
さらに、熱交換部材１５は、上流ハウジング４００と一
体成形され一様な温度分布を保持しているため、熱交換
部材１５と熱交換部材１５内を流れる空気との間で良好
な熱交換が行われ、熱交換部材１５内を流れる空気の温
度分布がほぼ均一化される。空気流に平行な熱交換部材
１５の貫通孔１５ｃの内壁面は、空気流に沿って空気流
の下流側に平行に延長にするとヒータ５７０および温度
計５８０の近傍に来るように形成されているので、熱交
換部材１５を通過した整流され温度分布が均一化された
空気は、ヒータ５７０および温度計５８０に向かって分
岐管４２０から計測管４３０に流入する。However, as described above, the heat exchange member 1
5 has a plurality of through-holes 15c surrounded by partition walls 15b perpendicular to the inside, so that the contact area between the air flowing through the heat exchange member 15 and the inner wall surface of the heat exchange member 15 is large.
Further, since the heat exchange member 15 is formed integrally with the upstream housing 400 and maintains a uniform temperature distribution, good heat exchange between the heat exchange member 15 and air flowing through the heat exchange member 15 is performed. As a result, the temperature distribution of the air flowing through the heat exchange member 15 is substantially uniformized. The inner wall surface of the through hole 15c of the heat exchange member 15 parallel to the air flow is formed so as to come near the heater 570 and the thermometer 580 when extending in parallel to the downstream side of the air flow along the air flow. Therefore, the rectified air having a uniform temperature distribution that has passed through the heat exchange member 15 flows from the branch pipe 420 to the measurement pipe 430 toward the heater 570 and the thermometer 580.
【００１９】計測管４３０は分岐管４２０よりも流路断
面積が小さいため、空気流がさらに整流され、分流比の
低下も少ない。計測管４３０に流入する空気は、ヒータ
５７０と温度計５８０でほぼ同等の温度になっており、
温度分布不均一はほとんどない。従って、低空気量にお
いても流速が確保でき、上流からの温度分布の影響を受
けにくくなる。Since the measuring pipe 430 has a smaller flow sectional area than the branch pipe 420, the air flow is further rectified, and the decrease in the branch flow ratio is small. The air flowing into the measuring pipe 430 has almost the same temperature with the heater 570 and the thermometer 580.
There is almost no temperature distribution non-uniformity. Therefore, the flow velocity can be ensured even at a low air amount, and the flow rate is hardly affected by the temperature distribution from the upstream.
【００２０】ヒータ５７０は制御回路１１４によって吸
気温度に対して一定温度に加熱される。計測管４３０に
導入された空気は、このヒータ５７０、温度計５８０お
よび制御回路１１４により空気流量が計測される。そし
て、制御回路１１４から出力された出力信号は燃料噴射
量制御装置等へ供給され、燃料噴射量の演算に使用され
る。The heater 570 is heated by the control circuit 114 to a constant temperature with respect to the intake air temperature. The air flow rate of the air introduced into the measurement pipe 430 is measured by the heater 570, the thermometer 580, and the control circuit 114. The output signal output from the control circuit 114 is supplied to a fuel injection amount control device or the like, and is used for calculating the fuel injection amount.
【００２１】計測管４３０に導入された空気は、仕切り
壁１６３に衝突して径方向に流れの方向を変え、さら
に、出口開口部４４０へ向けて流れる。そして出口開口
部４４０から再び吸気通路内へ流出する。本発明の第２
実施例を図３に示す。第２実施例では、熱交換部材２５
の貫通孔２５ｃは、熱交換部材２５の外壁２５ａと互い
に平行な仕切り壁２５ｂとで囲まれて形成される。これ
以外の構成、作動は第１実施例と同様である。The air introduced into the measuring tube 430 collides with the partition wall 163, changes the direction of the flow in the radial direction, and further flows toward the outlet opening 440. Then, it flows out again from the outlet opening 440 into the intake passage. Second embodiment of the present invention
An example is shown in FIG. In the second embodiment, the heat exchange member 25
Is formed by being surrounded by an outer wall 25a of the heat exchange member 25 and a partition wall 25b parallel to each other. Other configurations and operations are the same as those of the first embodiment.
【００２２】以上述べた各実施例では、ベルマウス部２
１０は樹脂製で上流側円筒部２００と一体成形される構
成であるから、ベルマウス部２１０の内壁に段差、突起
等の抵抗となる部分がなく、空気流がベルマウス形状に
より滑らかに整流されるため、分岐通路内のセンサ出力
変動を低減でき、また圧力損失を大幅に低減できる。ま
た、熱交換部材は上流ハウジング４００と一体に成形さ
れているため、安価に製造可能である。In each of the embodiments described above, the bell mouth unit 2
Since 10 is made of resin and is integrally formed with the upstream cylindrical portion 200, there is no resistance portion such as a step or a protrusion on the inner wall of the bell mouth portion 210, and the air flow is smoothly rectified by the bell mouth shape. Therefore, the sensor output fluctuation in the branch passage can be reduced, and the pressure loss can be significantly reduced. Further, since the heat exchange member is formed integrally with the upstream housing 400, it can be manufactured at low cost.
【００２３】さらに、出口開口部４４０より上流側に絞
り部２００ａが形成されているため、出口開口部４４０
において作用する負圧が、周方向の全周に渡って均等に
作用する。このため、上流側開口部２１３から流入する
空気流に偏りがあっても、その偏りを整流して出口開口
部４４０に作用させることができる。さらに、出口開口
部４４０は上流ハウジング４００の外周にほぼ全周にわ
たって開口しているため、吸気通路全体の流れによる作
用を受ける。このため、一部の乱流により分岐通路内の
流量が変動することが防止される。Further, since the throttle portion 200a is formed on the upstream side of the outlet opening 440, the outlet opening 440 is formed.
Negative pressure acts uniformly over the entire circumference in the circumferential direction. Therefore, even if there is a bias in the airflow flowing from the upstream opening 213, the bias can be rectified and act on the outlet opening 440. Further, since the outlet opening 440 is opened almost all around the outer periphery of the upstream housing 400, the outlet opening 440 is affected by the flow of the entire intake passage. Therefore, the flow rate in the branch passage is prevented from fluctuating due to partial turbulence.
【００２４】従って、本発明の実施例では、出口開口部
４４０における空気流を乱れの少ない状態に維持でき、
吸気通路を流れる全流量と分岐通路を流れる流量との比
率を正確に所定の比率に維持することができる。さら
に、分岐通路内の空気の乱流と温度差を低減しかつ分岐
通路の分流比の低下を低減して流量を計測することで正
確に吸気通路全体の流量を検出することができる。Therefore, in the embodiment of the present invention, the air flow at the outlet opening 440 can be maintained in a state of little turbulence,
The ratio between the total flow rate flowing through the intake passage and the flow rate flowing through the branch passage can be accurately maintained at a predetermined ratio. Further, the flow rate of the entire intake passage can be accurately detected by reducing the turbulent flow and temperature difference of the air in the branch passage and measuring the flow rate while reducing the decrease in the branch flow ratio of the branch passage.
【００２５】[0025]
【発明の効果】本発明の流量計によると、分岐通路内に
流入する流体の乱流を整流し、温度分布を均一化すると
ともに分流比の低下を低減することにより、正確な流量
を計測できるという効果がある。According to the flowmeter of the present invention, the turbulent flow of the fluid flowing into the branch passage is rectified, the temperature distribution is made uniform, and the decrease in the branch flow ratio is reduced, so that an accurate flow rate can be measured. This has the effect.
【図１】本発明の第１実施例による流量計を示す断面図
である。FIG. 1 is a sectional view showing a flow meter according to a first embodiment of the present invention.
【図２】図１に示すII−II線断面図である。FIG. 2 is a sectional view taken along line II-II shown in FIG.
【図３】本発明の第２実施例による流量計の熱交換部材
を示す横断面図である。FIG. 3 is a cross-sectional view illustrating a heat exchange member of a flow meter according to a second embodiment of the present invention.
１０ 流量計 １４ 中央部材 １５ 熱交換部材 １５ｂ 仕切り壁 １００ 中央円筒部（筒体） １４０ リブ（支持部材） １５０ リブ（支持部材） １６０ 中央ハウジング（中央部材） ２００ 上流円筒部（筒体） ３００ 下流円筒部（筒体） ３６０ 下流ハウジング（中央部材） ４００ 上流ハウジング（中央部材） ４１０ 入口開口部（導入口） ４２０ 分岐管（分岐通路） ４３０ 計測管（分岐通路） ４４０ 出口開口部（出口） ５７０ ヒータ（流速測定用抵抗体） ５８０ 温度計（温度補償用抵抗体） DESCRIPTION OF SYMBOLS 10 Flow meter 14 Central member 15 Heat exchange member 15b Partition wall 100 Central cylindrical part (cylindrical body) 140 Rib (supporting member) 150 Rib (supporting member) 160 Central housing (central member) 200 Upstream cylindrical part (cylindrical body) 300 Downstream Cylindrical part (cylindrical body) 360 Downstream housing (central member) 400 Upstream housing (central member) 410 Inlet opening (inlet) 420 Branch pipe (branch passage) 430 Measurement pipe (branch passage) 440 Outlet opening (outlet) 570 Heater (resistance element for measuring flow velocity) 580 Thermometer (resistance element for temperature compensation)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 永坂 玲 愛知県刈谷市昭和町１丁目１番地 日本 電装株式会社内 (56)参考文献 特開 平６−249691（ＪＰ，Ａ) 特開 平４−184222（ＪＰ，Ａ) 特開 平４−212022（ＪＰ，Ａ) 特開 平６−109505（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01F 1/68 - 1/699 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Rei Nagasaka 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (56) References JP-A-6-249691 (JP, A) JP-A-4- 184222 (JP, A) JP-A-4-212022 (JP, A) JP-A-6-109505 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G01F 1 / 68-1 / 699
Claims (1)
筒体と、 前記主通路のほぼ中央部に設けられる中央部材と、 前記主通路の壁面と前記中央部材とを連結し、前記中央
部材を前記主通路のほぼ中央に支持する支持部材と、 前記中央部材に開口し前記主通路を流れる流体の一部を
導入する導入口と、 前記中央部材に形成され、前記導入口から導入された流
体を流す分岐通路と、 この分岐通路の前記導入口の近傍下流に形成され、この
分岐通路を流れる流体の方向にこの分岐通路を複数の通
路に仕切る仕切り壁を有する熱交換部材と、 この熱交換部材の下流の分岐通路内に設けられるととも
に、前記熱交換部材の設けられる分岐通路の流路断面積
よりも小さい流路断面積を有する分岐通路内に設けら
れ、この分岐通路内の流量を計測する流速測定用抵抗体
と、 前記中央部材の所定部位に開口し、前記分岐通路を流れ
た流体を再び前記主通路に戻す出口とを備えたことを特
徴とする流量計。1. A resin tubular body having a main passage through which a fluid flows, a central member provided at a substantially central portion of the main passage, a wall of the main passage and the central member connected to each other, A support member for supporting a member at substantially the center of the main passage; an inlet opening to the central member to introduce a part of a fluid flowing through the main passage; and an inlet formed in the central member and introduced from the inlet. A heat exchange member formed downstream of the branch passage near the introduction port and dividing the branch passage into a plurality of passages in a direction of the fluid flowing through the branch passage; The branch passage is provided in a branch passage downstream of the heat exchange member, and is provided in a branch passage having a passage cross-sectional area smaller than that of the branch passage provided with the heat exchange member. Flow to measure A flowmeter, comprising: a speed measuring resistor; and an outlet opened at a predetermined portion of the central member and returning the fluid flowing through the branch passage to the main passage again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05084242A JP3106449B2 (en) | 1993-04-12 | 1993-04-12 | Flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05084242A JP3106449B2 (en) | 1993-04-12 | 1993-04-12 | Flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06294672A JPH06294672A (en) | 1994-10-21 |
| JP3106449B2 true JP3106449B2 (en) | 2000-11-06 |
Family
ID=13825002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05084242A Expired - Fee Related JP3106449B2 (en) | 1993-04-12 | 1993-04-12 | Flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3106449B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9521938B2 (en) | 2011-10-10 | 2016-12-20 | Carl Freudenberg Kg | Cleaning device with product information |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002202166A (en) * | 2000-12-27 | 2002-07-19 | Mitsui Mining & Smelting Co Ltd | Flowmeter |
-
1993
- 1993-04-12 JP JP05084242A patent/JP3106449B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9521938B2 (en) | 2011-10-10 | 2016-12-20 | Carl Freudenberg Kg | Cleaning device with product information |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06294672A (en) | 1994-10-21 |
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