JP2003262144A - Flow rate measuring device - Google Patents
Flow rate measuring deviceInfo
- Publication number
- JP2003262144A JP2003262144A JP2002064077A JP2002064077A JP2003262144A JP 2003262144 A JP2003262144 A JP 2003262144A JP 2002064077 A JP2002064077 A JP 2002064077A JP 2002064077 A JP2002064077 A JP 2002064077A JP 2003262144 A JP2003262144 A JP 2003262144A
- Authority
- JP
- Japan
- Prior art keywords
- air
- flow
- pedestal
- flow path
- flow rate
- 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.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気の流量を測定
する流量測定装置に関し、例えば内燃機関の吸入空気量
測定装置などに適用される流量測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate measuring device for measuring the flow rate of air, for example, a flow rate measuring device applied to an intake air amount measuring device of an internal combustion engine.
【０００２】[0002]
【従来の技術】従来、内燃機関の吸入空気量等を測定す
る装置として、薄膜式のエアフローセンサを使用し、被
測定空気を流す流路にエアフローセンサを配置した流量
測定装置が使用されている（例えば特開平８−２８５６
５２号公報、特開平１１−３２６０００号公報等参
照）。2. Description of the Related Art Conventionally, as a device for measuring the intake air amount of an internal combustion engine, a thin film type air flow sensor is used, and a flow rate measuring device in which an air flow sensor is arranged in a flow path for flowing air to be measured is used. (For example, JP-A-8-2856
52, JP-A-11-326000, etc.).
【０００３】内燃機関の吸気系にはエアフィルタが配設
され、吸入空気中に含まれる砂などの比較的大粒のパー
ティクルは、このエアフィルタで除去するようにしてい
る。しかし、吸入される空気中には、エアフィルタでは
除去されない比較的小径（例えば数百μm）のパーティ
クルが含まれており、これらのパーティクルが流路に入
った場合、このパーティクルが例えば数十ｍ/secの速度
でセンシング部に衝突すると、センシング部が破壊され
る虞が生じる。特に、薄膜式のエアフロセンサを用いる
流量測定装置では、センサのメンブレンの厚さが約１μ
m程度と非常に薄く形成されているため、パーティクル
が衝突すると、メンブレンが破損しやすいという問題が
あった。An air filter is arranged in the intake system of the internal combustion engine, and relatively large particles such as sand contained in the intake air are removed by this air filter. However, the inhaled air contains particles with a relatively small diameter (for example, several hundreds of μm) that are not removed by the air filter. If the sensor collides with the sensing unit at a speed of / sec, the sensing unit may be destroyed. In particular, in a flow rate measuring device using a thin film type air flow sensor, the thickness of the sensor membrane is about 1 μm.
Since it is formed to a very thin thickness of about m, there is a problem that the membrane is easily damaged when particles collide.
【０００４】[0004]
【発明が解決しようとする課題】そこで、従来、特開20
00‐304585号公報において、流量測定装置を配置する空
気通路内にルーバーを配設すると共にガイド部を配設
し、ルーバーとガイド部の作用により、パーティクルを
流量測定装置のセンシング部から離れた位置に排除し
て、センシング部にパーティクルの影響を与えないよう
した流量測定装置が提案されている。また、特表2001‐
504943号公報において、略Ｓ字状に湾曲した空気流路内
にセンシング部を配置し、空気流軸線方向に対し流路を
傾斜して配設し、パーティクルの衝突を回避するように
した流量測定装置が提案されている。[Patent Document 1] Japanese Patent Application Laid-Open No.
In Japanese Patent Laid-Open No. 00-304585, a louver is arranged in the air passage for arranging the flow rate measuring device, and a guide part is arranged. Therefore, there is proposed a flow rate measuring device that does not affect the sensing unit by particles. In addition, special table 2001-
In Japanese Patent Publication No. 504943, a flow rate measurement in which a sensing unit is arranged in an air flow path curved in a substantially S shape and the flow path is inclined with respect to the air flow axis direction to avoid collision of particles. A device has been proposed.
【０００５】しかし、前者の流量測定装置は、ルーバー
によってセンシング部へのパーティクルの衝突をある程
度回避することができるものの、センシング部近傍への
空気の流れがルーバーによって大きく減少し、流量の測
定精度が低下する問題があった。また、後者のもので
は、湾曲した流路にセンシング部を設けてはいるが、単
に空気流路を湾曲形状としているだけであるため、パー
ティクルの衝突を避けることができず、センシング部の
破損や汚染物質の付着により測定精度が低下する問題が
あった。However, in the former flow rate measuring device, although the louvers can prevent particles from colliding with the sensing section to some extent, the air flow in the vicinity of the sensing section is greatly reduced by the louver and the flow rate measurement accuracy is improved. There was a problem of decline. Further, in the latter, although the sensing part is provided in the curved flow path, since the air flow path is simply made into a curved shape, collision of particles cannot be avoided and damage to the sensing part or There is a problem that the measurement accuracy is lowered due to the adhesion of contaminants.
【０００６】本発明は、上述の課題を解決するものであ
り、センシング部へのパーティクルの衝突や汚染物質の
付着を防止すると共に、空気流量を安定して正確に測定
することができる流量測定装置を提供することを目的と
する。The present invention is intended to solve the above-mentioned problems, and it is possible to prevent the collision of particles and the attachment of pollutants to the sensing section and to measure the air flow rate stably and accurately. The purpose is to provide.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明の流量測定装置は、被測定空気を導入して流
通させる流路と、流路内に設けられた台座の一面に露出
して配設され、被測定空気の流量測定を行うセンシング
部と、を備えた流量測定装置において、流路内を流れる
被測定空気の流れに対しセンシング部を隠す方向に台座
が傾斜して配設されていることを特徴とする。In order to achieve the above-mentioned object, a flow rate measuring device of the present invention is provided with a flow passage through which air to be measured is introduced and circulated, and exposed on one surface of a pedestal provided in the flow passage. In a flow rate measuring device having a sensing section for measuring the flow rate of the measured air, the pedestal is arranged so as to conceal the sensing section with respect to the flow of the measured air flowing in the flow path. It is characterized by being installed.
【０００８】これによれば、一面にセンシング部を露出
して設けた台座が、流路内を流れる被測定空気の流れに
対しセンシング部を隠す方向に傾斜して配設されている
から、パーティクルを含む被測定空気が流路に進入した
際、被測定空気は、台座の反センシング部側の面に当っ
て通過するので、センシング部の表面に被測定空気中の
パーティクルが直接当ることはなく、センシング部の破
損や汚染物質の付着を防止することができる。また、従
来例のようなルーバーが流路内にないため、空気の流量
が大きく減少することはなく、空気流を安定して流し、
正確に空気流量を測定することができる。According to this, since the pedestal having the sensing portion exposed on one surface is disposed so as to be inclined in the direction in which the sensing portion is concealed with respect to the flow of the air to be measured flowing in the flow channel, When the air to be measured including the air enters the flow path, the air to be measured hits the surface of the pedestal on the side opposite to the sensing unit and passes, so the particles in the air to be measured do not directly hit the surface of the sensing unit. It is possible to prevent damage to the sensing unit and adhesion of contaminants. Further, since there is no louver in the flow path as in the conventional example, the flow rate of air does not decrease significantly, and the air flow is made to flow stably,
The air flow rate can be measured accurately.
【０００９】また、上記流量測定装置においては、請求
項２のように、流路内の台座の近傍の側壁に被測定空気
の流れを絞る絞り部を形成し、絞り部と台座間の間隔が
流路の上流側で大きく下流側で小さくなるような、絞り
部を形成することができる。Further, in the above flow rate measuring device, as in claim 2, a throttle portion for restricting the flow of the air to be measured is formed on the side wall near the pedestal in the flow path, and the distance between the throttle portion and the pedestal is reduced. It is possible to form a throttle portion that is large on the upstream side of the flow path and small on the downstream side.
【００１０】これによれば、流路を流れる被測定空気流
が絞り部と台座上のセンシング部近傍を流下する際、絞
り部によって被測定空気流とそこに含まれるパーティク
ルがセンシング部に当る角度が浅く（小さく）なり、こ
れによって、パーティクルがセンシング部に衝突する際
の衝撃力を一層低下させ、パーティクルによるセンシン
グ部の破損を防止することができる。さらに、センシン
グ部の近傍に絞り部を設けることにより、傾斜した台座
の近傍を流れる被測定空気が絞り部によって整流され安
定して通過し、空気流量を正確に安定して測定すること
ができる。According to this, when the measured airflow flowing through the flow path flows down near the throttle section and the sensing section on the pedestal, the angle at which the measured airflow and the particles contained therein hit the sensing section by the throttle section. Becomes shallower (smaller), whereby the impact force when the particles collide with the sensing unit can be further reduced, and damage to the sensing unit due to the particles can be prevented. Further, by providing the throttle portion in the vicinity of the sensing portion, the air to be measured flowing near the inclined pedestal is rectified and stably passed by the throttle portion, and the air flow rate can be accurately and stably measured.
【００１１】[0011]
【発明の実施の形態】以下、本発明の一実施形態を図面
に基づいて説明する。図１は第１実施形態の流量測定装
置の断面図を示し、図２はその正面図を示している。こ
の流量測定装置は、本体１内に形成した被測定空気を導
入して流通させる流路３と、流路３内に設けられた台座
１４の一面に露出して配設され、被測定空気の流量測定
を行うセンシング部４と、を備えて構成される。本体１
内の流路３は略逆Ｕ字状に形成され、その一端側面（上
流側）に入口１５が設けられ、その他端側面（下流側）
に出口１６が設けられる。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of the flow rate measuring device of the first embodiment, and FIG. 2 shows a front view thereof. This flow rate measuring device is disposed so as to be exposed on one surface of a flow path 3 for introducing and circulating the air to be measured formed in the main body 1 and a pedestal 14 provided in the flow path 3, And a sensing unit 4 that measures the flow rate. Body 1
The flow path 3 in the inside is formed in a substantially inverted U shape, the inlet 15 is provided on one end side surface (upstream side), and the other end side surface (downstream side).
An outlet 16 is provided at.
【００１２】また、本体１の流路３内には、入口１５の
近傍に入口側湾曲部５が形成され、出口１６の近傍に出
口側湾曲部７が設けられ、流路３の中央に中央湾曲部６
が形成されている。さらに、入口側湾曲部５の下流側で
中央湾曲部６の上流側の流路内に、センシング部４が台
座１４を介して配設されている。台座１４は板状に形成
され、流路３内の略中央を横断する形態で、流路３内に
取り付けられ、センシング部４は、台座１４の一面に露
出して埋設されている。そして、図４に示すように、こ
のセンシング部４を取付けた台座１４は、流路３内を流
れる被測定空気の流れに対しセンシング部４を隠す方向
に傾斜して配設されている。つまり、センシング部４を
その一面に露出して埋設してなる板状の台座１４は、流
路３の軸方向（流れ方向）に略沿って配設されるが、そ
のセンシング部４の面が下流側を僅かに向き、その反セ
ンシング部面が上流側を向くように、流路３の軸方向に
対し角度αだけ傾斜して装着されている（図４）。In the flow passage 3 of the main body 1, an inlet side curved portion 5 is formed in the vicinity of the inlet 15, an outlet side curved portion 7 is provided in the vicinity of the outlet 16, and a central portion is formed in the center of the passage 3. Curved part 6
Are formed. Further, the sensing unit 4 is arranged in the flow path on the downstream side of the inlet side curved section 5 and on the upstream side of the central curved section 6 via the pedestal 14. The pedestal 14 is formed in a plate shape and is attached to the inside of the flow path 3 so as to traverse substantially the center of the flow path 3, and the sensing portion 4 is exposed and embedded in one surface of the pedestal 14. Then, as shown in FIG. 4, the pedestal 14 to which the sensing unit 4 is attached is arranged so as to be inclined in a direction in which the sensing unit 4 is hidden with respect to the flow of the air to be measured flowing in the flow path 3. That is, the plate-shaped pedestal 14 in which the sensing portion 4 is exposed and embedded in one surface thereof is arranged substantially along the axial direction (flow direction) of the flow path 3, but the surface of the sensing portion 4 is It is mounted at an angle α with respect to the axial direction of the flow path 3 so that the downstream side thereof faces slightly and the surface of the opposite sensing portion faces the upstream side (FIG. 4).
【００１３】一方、本体１の上部には回路モジュール２
が取り付けられ、回路モジュール２の下部の取付部には
Ｏリングなどのシール材１２が装着される。回路モジュ
ール２内には、信号処理用の回路が収納され、電源線及
び信号線用のコネクタ１１がその側部に設けられる。On the other hand, the circuit module 2 is provided on the upper part of the main body 1.
Is attached, and a sealing material 12 such as an O-ring is attached to the attachment portion below the circuit module 2. A circuit for signal processing is housed in the circuit module 2, and a connector 11 for a power supply line and a signal line is provided on its side portion.
【００１４】本体１は、例えばガラス繊維入りＰＢＴ，
ＰＰＳ等の合成樹脂により成形され、上記のようにその
内部に、略逆Ｕ字状（或いは略Ｓ字状）を呈した流路３
が形成されている。そして、この流路３内の入口側湾曲
部５の下流側に測定用のセンシング部４が上述のように
台座１４を介して配設されている。The body 1 is made of, for example, glass fiber-containing PBT,
A flow path 3 formed of a synthetic resin such as PPS and having a substantially inverted U-shape (or a substantially S-shape) therein as described above.
Are formed. Then, the sensing part 4 for measurement is disposed on the downstream side of the inlet side curved part 5 in the flow path 3 via the pedestal 14 as described above.
【００１５】センシング部４は、例えば薄膜式のエアフ
ローセンサからなり、半導体基板１７上に、流量検出用
抵抗体及び発熱抵抗体を配置したメンブレンを形成し、
その近傍に吸気温検出用抵抗体を形成して構成され、抵
抗体の温度-抵抗特性を利用して、空気流量を測定す
る。半導体基板１７は板状の台座１４上の一面に露出し
て固定され、基板上の各端子はワイヤボンディングなど
を介して回路モジュール２内の回路に接続されている。
上述のように、センシング部４は、流路３内を流れる被
測定空気の流れに対しその表面（露出面）を隠す方向に
傾斜して、つまり流路３の軸方向に対し角度αだけ傾斜
して配設されている。The sensing unit 4 is composed of, for example, a thin film type air flow sensor, and a membrane on which a flow rate detecting resistor and a heat generating resistor are arranged is formed on a semiconductor substrate 17.
The intake air temperature detecting resistor is formed in the vicinity of the resistor, and the air flow rate is measured by utilizing the temperature-resistance characteristic of the resistor. The semiconductor substrate 17 is exposed and fixed on one surface of the plate-shaped pedestal 14, and each terminal on the substrate is connected to a circuit in the circuit module 2 via wire bonding or the like.
As described above, the sensing unit 4 is inclined with respect to the flow of the air to be measured flowing in the flow path 3 in a direction that hides the surface (exposed surface) thereof, that is, is inclined by an angle α with respect to the axial direction of the flow path 3. Are arranged.
【００１６】このように構成された流量測定装置は、図
３に示すように、内燃機関などの吸気管１０に設けられ
た取付孔に本体１を挿入し、空気流の上流側に本体1の
正面側の入口１５を向け、下流側に出口１６を向けて、
装着される。この際、本体1の上部のシール部材１２が
取付孔との間の隙間をシールする。As shown in FIG. 3, the flow rate measuring device constructed as described above has the main body 1 inserted into a mounting hole provided in an intake pipe 10 of an internal combustion engine or the like, and the main body 1 of the main body 1 is provided upstream of the air flow. Direct the inlet 15 on the front side and the outlet 16 on the downstream side,
It is installed. At this time, the seal member 12 on the upper part of the main body 1 seals the gap between the seal member 12 and the mounting hole.
【００１７】吸気動作によって吸気管１０内を空気が流
れると、管内の空気流の一部が本体１の入口１５から流
路３内に流入し、略逆Ｕ字状の流路３に沿って流れる。
このとき、台座１４上のセンシング部４の近傍におい
て、空気流は、図４に示すように、台座１４の上流側の
縁部に当って曲げられて流路３を上昇する。またこのと
き、台座１４はセンシング部４を空気流から隠す方向に
傾斜して、つまり流路３の軸方向に対し角度αだけセン
シング部４の面を下流側に向くように傾斜して配設され
ているから、空気流は台座１４の反センシング部側に当
って流れることになる。When the air flows in the intake pipe 10 by the intake operation, a part of the air flow in the pipe flows into the flow passage 3 from the inlet 15 of the main body 1 and follows the flow passage 3 having a substantially inverted U shape. Flowing.
At this time, in the vicinity of the sensing unit 4 on the pedestal 14, the airflow hits the upstream edge of the pedestal 14 and is bent to rise in the flow path 3, as shown in FIG. Further, at this time, the pedestal 14 is arranged so as to be inclined in a direction in which the sensing unit 4 is hidden from the air flow, that is, the pedestal 14 is inclined so that the surface of the sensing unit 4 faces the downstream side by an angle α with respect to the axial direction of the flow path 3. Therefore, the airflow impinges on the side of the pedestal 14 opposite to the sensing portion and flows.
【００１８】したがって、パーティクルを含む空気流が
流路３内に入り、流路３内を流下した場合であっても、
パーティクルが直接センシング部４に衝突することは避
けられる。このため、センシング部４へのパーティクル
の衝突を回避してセンシング部４の破損や汚染物質の付
着を防止することができる。Therefore, even when an air flow containing particles enters the flow path 3 and flows down in the flow path 3,
It is possible to prevent the particles from directly colliding with the sensing unit 4. Therefore, it is possible to avoid collision of particles with the sensing unit 4 and prevent damage to the sensing unit 4 and adhesion of contaminants.
【００１９】図６は、第２実施形態の流量測定装置の上
記図４に対応した断面図を示している。この実施形態で
は、上記第１実施形態における流路３内のセンシング部
４の近傍の側壁に、絞り部２０が流路３内を流れる空気
流を絞るように設けられる。FIG. 6 shows a sectional view of the flow rate measuring device of the second embodiment corresponding to FIG. In this embodiment, a throttle unit 20 is provided on the side wall near the sensing unit 4 in the flow channel 3 in the first embodiment so as to throttle the air flow flowing in the flow channel 3.
【００２０】この絞り部２０は、図６のように、流路３
内に位置する台座１４のセンシング部４側の側壁に突出
して設けられている。また、その絞り部２０は、絞り部
２０と台座１４間の間隔が、流路３の上流側で大きく下
流側で小さくなるように、つまり、絞り部２０の側壁で
の高さが、上流側で低く、下流側で高く突き出すよう
に、形成されている。具体的には、図６に示すように、
流路３の上流側での絞り部２０と台座１４間の間隔Ｗ１
が、下流側で絞り部２０と台座１４間の間隔Ｗ２より大
きく（広く）なるように、絞り部２０が形成されてい
る。As shown in FIG. 6, the throttle portion 20 has a flow path 3
It is provided so as to project from the side wall of the pedestal 14 located inside on the side of the sensing unit 4. Further, the narrowed portion 20 is such that the distance between the narrowed portion 20 and the pedestal 14 is large on the upstream side of the flow path 3 and small on the downstream side, that is, the height of the side wall of the narrowed portion 20 is on the upstream side. It is formed so that it is low at and is high at the downstream side. Specifically, as shown in FIG.
An interval W1 between the throttle portion 20 and the pedestal 14 on the upstream side of the flow path 3
However, the throttle portion 20 is formed so as to be larger (wider) than the distance W2 between the throttle portion 20 and the pedestal 14 on the downstream side.
【００２１】このような構成の流量測定装置では、吸気
動作によって吸気管１０内を空気が流れると、管内の空
気流の一部が本体１の入口１５から流路３内に流入し、
略逆Ｕ字状の流路３に沿って流れる。このとき、台座１
４上のセンシング部４の近傍において、空気流は、図６
に示すように、台座１４の上流側の縁部に当って曲げら
れて流路３を上昇する。また、台座１４はセンシング部
４を空気流から隠す方向に傾斜して配設されているか
ら、空気流は台座１４の反センシング部側に当って流れ
ることになる。したがって、パーティクルを含む空気流
が流路３内に入り、流路３内を流れた場合であっても、
パーティクルが直接センシング部４に衝突することは防
止される。In the flow rate measuring device having such a structure, when air flows in the intake pipe 10 by the intake operation, a part of the air flow in the pipe flows into the flow passage 3 from the inlet 15 of the main body 1,
It flows along the substantially U-shaped flow path 3. At this time, pedestal 1
In the vicinity of the sensing unit 4 on the upper part of FIG.
As shown in FIG. 3, the flow path 3 is lifted by being bent by hitting the upstream edge of the pedestal 14. Further, since the pedestal 14 is arranged so as to be inclined in the direction in which the sensing unit 4 is hidden from the air flow, the air flow will flow against the side of the pedestal 14 opposite to the sensing unit. Therefore, even when the air flow containing particles enters the flow path 3 and flows in the flow path 3,
The particles are prevented from directly colliding with the sensing unit 4.
【００２２】さらに、流路３を流れる空気流が絞り部２
０と台座１４上のセンシング部４近傍を流下する際、図
７（ｂ）のごとく、絞り部２０によって空気流とそこに
含まれるパーティクルがセンシング部４に当る角度θ２
は、図７（ａ）のように台座１４ａが傾斜せずに流れ方
向（流路の軸方向）と平行に配設された場合にパーティ
クルが当る角度θ１より、浅く（小さく）なる。Furthermore, the air flow flowing through the flow path 3 is reduced by the throttle portion 2.
0 and the vicinity of the sensing unit 4 on the pedestal 14 flow down, as shown in FIG. 7B, the angle θ 2 at which the airflow and the particles contained therein hit the sensing unit 4 by the throttle unit 20.
Is shallower (smaller) than the angle θ1 at which the particles hit when the pedestal 14a is arranged in parallel with the flow direction (axial direction of the flow path) as shown in FIG. 7A.
【００２３】これにより、図７（ａ）のように台座１４
ａとセンシング部４ａが流路３の流れ方向と平行に配設
された形態で、絞り部２０を設けた場合に比べ、図７
（ｂ）のようにセンシング部４を隠すように台座１４を
傾斜させて配設した形態で、絞り部２０を設けた場合に
は、パーティクルがセンシング部４に衝突する際の衝撃
力を低下させ、パーティクルによるセンシング部４の破
損を防止することができる。さらに、センシング部４の
近傍の側壁に絞り部２０を設けることにより、傾斜した
台座１４の近傍を流れる空気が絞り部２０によって整流
され安定して流下し、空気流量を安定して正確に測定す
ることができる。As a result, as shown in FIG.
7A and a sensing unit 4a are arranged in parallel with the flow direction of the flow path 3, as compared with the case where the throttle unit 20 is provided, FIG.
When the pedestal 14 is arranged so as to be inclined so as to hide the sensing unit 4 as shown in (b) and the diaphragm unit 20 is provided, the impact force when particles collide with the sensing unit 4 is reduced. Therefore, it is possible to prevent the sensing unit 4 from being damaged by particles. Further, by providing the throttle portion 20 on the side wall near the sensing portion 4, the air flowing near the inclined pedestal 14 is rectified by the throttle portion 20 and stably flows down, and the air flow rate is stably and accurately measured. be able to.
【００２４】[0024]
【発明の効果】以上説明したように、本発明の請求項１
の流量測定装置によれば、パーティクルを含む被測定空
気が流路に進入した際、被測定空気は、台座の反センシ
ング部側の面に当って流れるから、センシング部の表面
に被測定空気中のパーティクルが直接衝突することを回
避して、センシング部の破損や汚染物質の付着を防止す
ることができる。また、従来のようなルーバーが流路内
にないため、空気の流量が大きく減少することはなく、
被測定空気を安定して流し、正確に空気流量を測定する
ことができる。As described above, according to the first aspect of the present invention.
According to the flow rate measuring device of, when the measured air containing particles enters the flow path, the measured air flows against the surface of the pedestal on the side opposite to the sensing unit, so It is possible to prevent the particles from directly colliding with each other and prevent damage to the sensing unit and adhesion of contaminants. Also, since there is no louver in the flow path as in the past, the flow rate of air does not decrease significantly,
The air to be measured can be flowed stably and the air flow rate can be accurately measured.
【００２５】さらに、請求項２の流量測定装置によれ
ば、流路を流れる被測定空気流が絞り部と台座上のセン
シング部近傍を流下する際、絞り部によって被測定空気
流とそこに含まれるパーティクルの流れる方向が変化し
てセンシング部に当る角度が浅く（小さく）なり、これ
によって、パーティクルがセンシング部に衝突する際の
衝撃力を低下させ、パーティクルによるセンシング部の
破損を防止することができる。さらに、絞り部によって
傾斜した台座の近傍を流れる被測定空気の流れが整流さ
れ、被測定空気がセンシング部近傍を安定して流れ、空
気流量を安定して測定することができる。Further, according to the flow rate measuring device of the second aspect, when the air flow to be measured flowing through the flow path flows down near the throttle part and the sensing part on the pedestal, the air flow to be measured and the air flow to be measured are included therein. The direction in which the particles flow changes and the angle of contact with the sensing part becomes shallower (smaller), which reduces the impact force when the particles collide with the sensing part and prevents the particle from damaging the sensing part. it can. Further, the flow of the air to be measured flowing near the inclined pedestal is rectified by the throttle portion, the air to be measured stably flows near the sensing portion, and the air flow rate can be stably measured.
【図１】本発明の第１実施形態の流量測定装置の断面図
である。FIG. 1 is a sectional view of a flow rate measuring device according to a first embodiment of the present invention.
【図２】同流量測定装置の正面図である。FIG. 2 is a front view of the same flow measuring device.
【図３】吸気管に装着した状態の同流量測定装置の断面
図である。FIG. 3 is a cross-sectional view of the same flow rate measuring device mounted on an intake pipe.
【図４】図１におけるVI-VI断面図である。4 is a sectional view taken along line VI-VI in FIG.
【図５】図１におけるV-V断面図である。5 is a sectional view taken along line VV in FIG.
【図６】第２実施形態の流量測定装置の図４に対応した
断面図である。FIG. 6 is a cross-sectional view of a flow rate measuring device according to a second embodiment corresponding to FIG.
【図７】（ａ）と（ｂ）は台座を流路内に平行に配設し
た場合と傾斜して配設した場合の比較説明断面図であ
る。7 (a) and 7 (b) are comparative explanatory cross-sectional views of a case where the pedestal is arranged in parallel in the flow path and a case where the pedestal is arranged inclined.
１−本体 ３−流路 ４−センシング部 ５−入口側湾曲部 ６−中央湾曲部 １４−台座 1-Main body 3-flow path 4- Sensing part 5-entrance side curved part 6-central bend 14-pedestal
Claims (2)
と、該流路内に設けられた台座の一面に露出して配設さ
れ、被測定空気の流量測定を行うセンシング部と、を備
えた流量測定装置において、 該流路内を流れる被測定空気の流れに対しセンシング部
を隠す方向に前記台座が傾斜して配設されていることを
特徴とする流量測定装置。1. A flow path for introducing and circulating the air to be measured, and a sensing section which is disposed so as to be exposed on one surface of a pedestal provided in the flow path and which measures the flow rate of the air to be measured. A flow rate measuring device provided with the pedestal, wherein the pedestal is arranged so as to be inclined with respect to a flow of air to be measured flowing in the flow path in a direction in which the sensing unit is hidden.
被測定空気の流れを絞る絞り部が形成され、該絞り部と
該台座間の間隔が該流路の上流側で大きく下流側で小さ
くなるように、該絞り部が形成されていることを特徴と
する請求項１記載の流量測定装置。2. A side wall near the pedestal in the flow path,
A throttle portion that throttles the flow of the measured air is formed, and the throttle portion is formed so that the distance between the throttle portion and the pedestal is large on the upstream side of the flow path and small on the downstream side. The flow rate measuring device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002064077A JP2003262144A (en) | 2002-03-08 | 2002-03-08 | Flow rate measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002064077A JP2003262144A (en) | 2002-03-08 | 2002-03-08 | Flow rate measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003262144A true JP2003262144A (en) | 2003-09-19 |
Family
ID=29197034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002064077A Pending JP2003262144A (en) | 2002-03-08 | 2002-03-08 | Flow rate measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003262144A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2060879A1 (en) | 2007-11-19 | 2009-05-20 | Hitachi Ltd. | Air flow measuring instrument |
| JP2009192281A (en) * | 2008-02-13 | 2009-08-27 | Denso Corp | Air flow meter |
| JP2011075359A (en) * | 2009-09-30 | 2011-04-14 | Hitachi Automotive Systems Ltd | Flow-rate measurement apparatus |
| DE102008000864B4 (en) * | 2007-03-29 | 2016-02-25 | Denso Corporation | Flowmeter |
| US9709428B2 (en) | 2012-06-15 | 2017-07-18 | Hitachi Automotive Systems, Ltd. | Thermal flow meter with a protrusion having an orifice surface and recovery surface provided on a wall surface of a bypass passage |
| US20170356868A1 (en) * | 2014-12-23 | 2017-12-14 | Heraeus Sensor Technology Gmbh | Sensor for detecting electrically conductive and/or polarizable particles, sensor system, method for operating a sensor, method for producing a sensor of this type and use of a sensor of this type |
| KR20210075579A (en) * | 2019-12-13 | 2021-06-23 | 포항공과대학교 산학협력단 | Heating device for flowmeter and thin membrane thermal flowmeter comprising the same |
-
2002
- 2002-03-08 JP JP2002064077A patent/JP2003262144A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008000864B4 (en) * | 2007-03-29 | 2016-02-25 | Denso Corporation | Flowmeter |
| EP2060879A1 (en) | 2007-11-19 | 2009-05-20 | Hitachi Ltd. | Air flow measuring instrument |
| US7942053B2 (en) | 2007-11-19 | 2011-05-17 | Hitachi, Ltd. | Air flow measuring instrument having dust particle diverting structure |
| JP2009192281A (en) * | 2008-02-13 | 2009-08-27 | Denso Corp | Air flow meter |
| JP2011075359A (en) * | 2009-09-30 | 2011-04-14 | Hitachi Automotive Systems Ltd | Flow-rate measurement apparatus |
| US9709428B2 (en) | 2012-06-15 | 2017-07-18 | Hitachi Automotive Systems, Ltd. | Thermal flow meter with a protrusion having an orifice surface and recovery surface provided on a wall surface of a bypass passage |
| DE112013002999B4 (en) | 2012-06-15 | 2021-11-04 | Hitachi Astemo, Ltd. | Thermal flow meter |
| US20170356868A1 (en) * | 2014-12-23 | 2017-12-14 | Heraeus Sensor Technology Gmbh | Sensor for detecting electrically conductive and/or polarizable particles, sensor system, method for operating a sensor, method for producing a sensor of this type and use of a sensor of this type |
| US20170363530A1 (en) * | 2014-12-23 | 2017-12-21 | Heraeus Sensor Technology Gmbh | Sensor for detecting electrically conductive and/or polarizable particles, sensor system, method for operating a sensor, method for producing a sensor of this type and use of a sensor of this type |
| US10705002B2 (en) | 2014-12-23 | 2020-07-07 | Heraeus Nexensos Gmbh | Sensor for detecting electrically conductive and/or polarizable particles and method for adjusting such a sensor |
| KR20210075579A (en) * | 2019-12-13 | 2021-06-23 | 포항공과대학교 산학협력단 | Heating device for flowmeter and thin membrane thermal flowmeter comprising the same |
| KR102303677B1 (en) * | 2019-12-13 | 2021-09-17 | 포항공과대학교 산학협력단 | Heating device for flowmeter and thin membrane thermal flowmeter comprising the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5183164B2 (en) | Flow measuring device | |
| US6820479B2 (en) | Device for determining at least one parameter of a flowing medium | |
| JP5178388B2 (en) | Air flow measurement device | |
| JP5631204B2 (en) | Hot film type air flow meter and manufacturing method thereof | |
| JP4416012B2 (en) | Intake air flow rate measuring device | |
| EP2056076B1 (en) | Heating resistor type air flow rate measuring device | |
| CN1072798C (en) | Device for measuring mass of flowing medium | |
| JP2012163505A (en) | Structure of sensor | |
| JP4106224B2 (en) | Flow measuring device | |
| JP5167343B2 (en) | Equipment for measuring fluid media | |
| JP2003185481A (en) | Flowrate-measuring apparatus | |
| JP2003262144A (en) | Flow rate measuring device | |
| JP6069504B2 (en) | Temperature / humidity sensor | |
| JP3797210B2 (en) | Flow measuring device | |
| ZA200206052B (en) | Device for measuring air flow, comprising a device for separating foreign particles. | |
| JP2006522921A (en) | Apparatus for measuring at least one parameter of a medium flowing in a pipeline | |
| JP7122462B2 (en) | physical quantity detector | |
| JP2003315116A (en) | Flow measuring device | |
| JP5542614B2 (en) | Flow measuring device | |
| US20010006005A1 (en) | Flow rate measuring apparatus with a flow rate detector protecting structure | |
| JP2003176740A (en) | Fluid measurement device | |
| JP4909561B2 (en) | Heating resistor type air flow measuring device | |
| US6945105B2 (en) | Air mass flowmeter with controlled flow separation position | |
| JP2001033288A (en) | Air flow rate measuring device | |
| JP2009063391A (en) | Intake-system component mounted with heating resistor type air flow rate measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040602 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050622 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20050628 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20051101 |