JP2011112569A - Air flow rate measuring device - Google Patents

Air flow rate measuring device Download PDF

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JP2011112569A
JP2011112569A JP2009270685A JP2009270685A JP2011112569A JP 2011112569 A JP2011112569 A JP 2011112569A JP 2009270685 A JP2009270685 A JP 2009270685A JP 2009270685 A JP2009270685 A JP 2009270685A JP 2011112569 A JP2011112569 A JP 2011112569A
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bypass
sub
outlet
dust
duct
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JP5273024B2 (en
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Noboru Kitahara
昇 北原
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Denso Corp
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Denso Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F5/00—Measuring a proportion of the volume flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow

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  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dust from arriving at a flow rate sensor, when pulsation including a back flow is generated in a main flow in a duct, in an air flow rate measuring device 1. <P>SOLUTION: In this air flow rate measuring device 1, a bypass outlet 14 is opened on the furthermore downstream than a sub-bypass outlet 17 in the main flow direction. A step 25 as a dust jump-up means is provided, which directs the course of dust flowing out from the bypass outlet 14 to an avoiding direction of the sub-bypass outlet 17 when a back flow is generated in the main flow in the duct. Hereby, when pulsation including a back flow is generated in the duct, dust flowing out from the bypass outlet 14 is carried by the back flow to advance toward the sub-bypass outlet 17, but the dust collides with the step 25 and jumps up, to thereby prevent the dust from entering from the sub-bypass outlet 17 and arriving at the flow rate sensor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ダクトの内部を流れる空気の一部を取り込むバイパス流路と、バイパス流路より分岐して設けられてバイパス流路を流れる空気の一部を取り込むサブバイパス流路とを有し、サブバイパス流路に配置される流量センサによって空気流量を測定する空気流量測定装置に関する。   The present invention has a bypass flow path that takes in a part of the air flowing inside the duct, and a sub bypass flow path that takes in a part of the air that is branched from the bypass flow path and flows through the bypass flow path, The present invention relates to an air flow rate measuring device that measures an air flow rate with a flow rate sensor disposed in a sub-bypass channel.

空気流量測定装置は、ダクトの内部を流れる空気の一部を取り込むバイパス流路と、バイパス流路より分岐して設けられてバイパス流路を流れる空気の一部を取り込むサブバイパス流路とが形成されたハウジングと、サブバイパス流路に配設され、サブバイパス流路を流れる空気の流量を測定する流量センサとを備える。
そして、バイパス流路とサブバイパス流路との分岐により、ダクト内部を流れる空気に含まれるダストを分離して、バイパス流路にダストを流すように構成されている。 The air flow measuring device is formed with a bypass flow path that takes in a part of the air flowing inside the duct and a sub bypass flow path that is branched from the bypass flow path and takes in a part of the air flowing through the bypass flow path. And a flow rate sensor that is disposed in the sub-bypass channel and measures a flow rate of air flowing through the sub-bypass channel.
And it is comprised so that the dust contained in the air which flows through the inside of a duct may be isolate | separated by the branch of a bypass flow path and a sub bypass flow path, and dust will flow into a bypass flow path.

しかし、従来の空気流量測定装置１００では、図６に示すようにサブバイパス流路１０１の出口１０２がバイパス流路１０３の出口１０４の近傍にあるため、ダクト内の主流に逆流を含む脈動が生じた際に、バイパス流路１０３の出口１０４から流出したダストがサブバイパス流路１０１の出口１０２からサブバイパス流路１０１内に流れ込む虞がある（特許文献１、２参照）。
そして、サブバイパス流路１０１にダストが流れ込んだ場合にはサブバイパス流路１０１内に設置された流量センサ１０５が破壊される虞がある。 However, in the conventional air flow rate measuring device 100, as shown in FIG. 6, the outlet 102 of the sub-bypass channel 101 is in the vicinity of the outlet 104 of the bypass channel 103, so that pulsation including backflow occurs in the main flow in the duct. In this case, dust flowing out from the outlet 104 of the bypass channel 103 may flow into the sub bypass channel 101 from the outlet 102 of the sub bypass channel 101 (see Patent Documents 1 and 2).
When dust flows into the sub-bypass channel 101, the flow sensor 105 installed in the sub-bypass channel 101 may be destroyed.

特許第４１６９８０２号公報Japanese Patent No. 4169802 特開２００８−３０９６１４号公報JP 2008-309614 A

本発明は、上記の問題点を解決するためになされたものであり、その目的は、空気流量測定装置において、ダクト内の主流に逆流を含む脈動が生じた際のダストの流量センサへの到達を防ぐことにある。   The present invention has been made to solve the above-described problems, and its purpose is to reach the flow sensor of dust when a pulsation including backflow occurs in the main flow in the duct in the air flow measurement device. Is to prevent.

〔請求項１の手段〕
請求項１に記載の空気流量測定装置は、ダクトの内部を流れる空気の一部を取り込むバイパス流路と、バイパス流路より分岐して設けられてバイパス流路を流れる空気の一部を取り込むサブバイパス流路とが形成されたハウジングと、サブバイパス流路に配設され、サブバイパス流路を流れる空気の流量を測定する流量センサとを備える。
そして、バイパス流路とサブバイパス流路との分岐で、ダクト内部を流れる空気に含まれるダストを分離して、ダストをバイパス流路側に流す。 [Means of Claim 1]
The air flow rate measuring device according to claim 1 is provided with a bypass channel that takes in a part of the air flowing inside the duct, and a sub that is branched from the bypass channel and takes in a part of the air that flows through the bypass channel. A housing in which a bypass channel is formed, and a flow rate sensor that is disposed in the sub-bypass channel and measures a flow rate of air flowing through the sub-bypass channel.
And the dust contained in the air which flows through the inside of a duct is isolate | separated by the branch of a bypass flow path and a sub bypass flow path, and dust is flowed to the bypass flow path side.

また、ダクトの主流方向において、バイパス流路の出口は、サブバイパス流路の出口よりも下流に開口しており、ダクト内の主流に逆流が生じた場合にバイパス流路の出口から流出したダストの進路をサブバイパス流路の出口を避ける方向に向かわせるダスト跳ね手段を備える。   In addition, in the main flow direction of the duct, the outlet of the bypass channel is opened downstream from the outlet of the sub-bypass channel, and dust flowing out from the outlet of the bypass channel when a reverse flow occurs in the main flow in the duct. And a dust splashing means for directing the path in a direction avoiding the outlet of the sub-bypass channel.

ダクト内の主流に逆流を含む脈動が生じると、バイパス流路の出口から流出したダストが、逆流に乗って、サブバイパス流路の出口に向かって進もうとする。
しかし、ダスト跳ね手段を設けてダストの進路を変えることで、ダストがサブバイパス流路の出口からサブバイパス流路内に侵入するのを防ぐことができる。このため、バイパス流路内に配置された流量センサにダストが到達して破壊する虞はない。 When a pulsation including a backflow occurs in the main flow in the duct, the dust flowing out from the outlet of the bypass flow path tries to travel toward the outlet of the sub-bypass flow path by riding on the reverse flow.
However, it is possible to prevent dust from entering the sub-bypass channel from the outlet of the sub-bypass channel by providing dust splashing means and changing the course of the dust. For this reason, there is no possibility that dust will reach the flow rate sensor arranged in the bypass flow path and be destroyed.

〔請求項２の手段〕
請求項２に記載の空気流量測定装置は、ダスト跳ね手段が、ダクトの主流方向におけるバイパス流路の出口とサブバイパス流路の出口との間で、ハウジングの外周面上に形成された段差である。 [Means of claim 2]
In the air flow rate measuring device according to claim 2, the dust splashing means is a step formed on the outer peripheral surface of the housing between the outlet of the bypass channel and the outlet of the sub-bypass channel in the main flow direction of the duct. is there.

これによれば、ハウジングの外周面に段差を形成するという簡易な方法で、ダストがサブバイパス流路の出口からサブバイパス流路内に侵入するのを防ぐことができる。 According to this, it is possible to prevent dust from entering the sub bypass channel from the outlet of the sub bypass channel with a simple method of forming a step on the outer peripheral surface of the housing.

〔請求項３の手段〕
請求項３に記載の空気流量測定装置では、バイパス流路が、バイパス流路の入口から主流方向に直線状に形成されており、バイパス流路の入口、バイパス流路の出口、サブバイパス流路の出口、およびダスト跳ね手段は、ダクトの主流方向から見て、互いに略同じ位置で且つダクトの中央近傍に位置する。
バイパス流路がバイパス流路の入口から主流方向に直線状に形成され、バイパス流路の入口とバイパス流路の出口とがダクトの主流方向から見て略同じ位置にあるならば、バイパス流路を通過する空気内のダストは慣性力によって直進するため、サブバイパス流路とバイパス流路との分岐でダスト分離することができる。 [Means of claim 3]
In the air flow rate measuring device according to claim 3, the bypass channel is formed linearly in the main flow direction from the inlet of the bypass channel, the inlet of the bypass channel, the outlet of the bypass channel, the sub-bypass channel The outlet and the dust splashing means are located at substantially the same position and in the vicinity of the center of the duct as viewed from the main flow direction of the duct.
If the bypass channel is formed linearly in the main flow direction from the inlet of the bypass channel and the inlet of the bypass channel and the outlet of the bypass channel are substantially at the same position when viewed from the main flow direction of the duct, the bypass channel Since the dust in the air passing through the air travels straight due to the inertial force, the dust can be separated at the branch of the sub-bypass channel and the bypass channel.

また、バイパス流路の入口とサブバイパス流路の出口とが、ダクトの主流方向から見て、略同じ位置で且つダクトの中央近傍に位置するならば、偏流の影響を受けにくく、流量センサによる測定結果が安定する。
また、バイパス流路の出口、サブバイパス流路の出口、およびダスト跳ね手段がダクトの主流方向から見て略同じ位置にあるならば、逆流により、サブバイパス流路の出口からダストが侵入するのを確実に防止することができる。 In addition, if the inlet of the bypass channel and the outlet of the sub-bypass channel are located at substantially the same position and near the center of the duct when viewed from the main flow direction of the duct, it is difficult to be affected by drift, and the flow rate sensor The measurement result is stable.
Also, if the outlet of the bypass channel, the outlet of the sub-bypass channel, and the dust splashing means are located at substantially the same position when viewed from the main flow direction of the duct, dust will enter from the outlet of the sub-bypass channel due to the reverse flow. Can be reliably prevented.

すなわち、バイパス流路の入口、バイパス流路の出口、サブバイパス流路の出口、およびダスト跳ね手段が、ダクトの主流方向から見て、略同じ位置で且つダクトの中央近傍にあることにより、流速測定に偏流の影響を与えないようにするとともに、ダストの効果的な分離、ダストのサブバイパス流路内への侵入防止を同時に達成することができる。 That is, when the bypass channel inlet, the bypass channel outlet, the sub bypass channel outlet, and the dust splashing means are located at substantially the same position and near the center of the duct as viewed from the main flow direction of the duct, In addition to preventing the influence of drift on the measurement, it is possible to achieve effective separation of dust and prevention of dust entry into the sub-bypass channel at the same time.

空気流量測定装置の断面図である（実施例１）。(Example 1) which is sectional drawing of an air flow rate measuring apparatus. 空気流量測定装置の主流の上流側からみた図である（実施例１）。(Example 1) which is the figure seen from the upstream of the mainstream of an air flow measuring device. 空気流量測定装置の主流の下流側からみた図である（実施例１）。(Example 1) which was seen from the downstream of the mainstream of an air flow measuring device. （ａ）は、空気流量測定装置の側面図であり、（ｂ）は、空気流量測定装置の部分斜視図である（実施例１）。(A) is a side view of an air flow measuring device, (b) is a partial perspective view of an air flow measuring device (Example 1). 空気流量測定装置の底面図である（実施例１）。(Example 1) which is a bottom view of an air flow rate measuring apparatus. 空気流量測定装置の断面図である（従来例）。It is sectional drawing of an air flow measuring device (conventional example).

本発明の空気流量測定装置は、ダクトの内部を流れる空気の一部を取り込むバイパス流路と、バイパス流路より分岐して設けられてバイパス流路を流れる空気の一部を取り込むサブバイパス流路とが形成されたハウジングと、サブバイパス流路に配設され、サブバイパス流路を流れる空気の流量を測定する流量センサとを備える。
そして、バイパス流路とサブバイパス流路との分岐で、ダクト内部を流れる空気に含まれるダストを分離して、ダストをバイパス流路側に流す。 The air flow rate measuring device according to the present invention includes a bypass channel that takes in a part of air flowing inside a duct, and a sub-bypass channel that branches from the bypass channel and takes in a part of air flowing through the bypass channel. And a flow rate sensor that is disposed in the sub-bypass channel and measures the flow rate of the air flowing through the sub-bypass channel.
And the dust contained in the air which flows through the inside of a duct is isolate | separated by the branch of a bypass flow path and a sub bypass flow path, and dust is flowed to the bypass flow path side.

また、ダクトの主流方向において、バイパス流路の出口は、サブバイパス流路の出口よりも下流に開口しており、ダクト内の主流に逆流が生じた場合にバイパス流路の出口から流出したダストの進路をサブバイパス流路の出口を避ける方向に向かわせるダスト跳ね手段を備える。 In addition, in the main flow direction of the duct, the outlet of the bypass channel is opened downstream from the outlet of the sub-bypass channel, and dust flowing out from the outlet of the bypass channel when a reverse flow occurs in the main flow in the duct. And a dust splashing means for directing the path in a direction avoiding the outlet of the sub-bypass channel.

また、ダスト跳ね手段が、ダクトの主流方向におけるバイパス流路の出口とサブバイパス流路の出口との間で、ハウジングの外周面上に形成された段差である。 Further, the dust splashing means is a step formed on the outer peripheral surface of the housing between the outlet of the bypass channel and the outlet of the sub-bypass channel in the main flow direction of the duct.

また、バイパス流路が、バイパス流路の入口から主流方向に直線状に形成されており、バイパス流路の入口、バイパス流路の出口、サブバイパス流路の出口、およびダスト跳ね手段は、ダクトの主流方向から見て、互いに略同じ位置で且つダクトの中央近傍に位置する。 Further, the bypass channel is formed linearly in the main flow direction from the bypass channel inlet, and the bypass channel inlet, the bypass channel outlet, the sub-bypass channel outlet, and the dust splashing means are duct When viewed from the main flow direction, the positions are substantially the same and near the center of the duct.

〔実施例１の構成〕
実施例１の空気流量測定装置１の構成を、図１〜５を用いて説明する。
空気流量測定装置１は、例えば、自動車用エンジンの吸入空気量を計測するエアフローメータであり、エアクリーナの下流側に接続するダクト２に取り付けられている。
空気流量測定装置１は、以下に説明するハウジング３、流量センサ４、温度センサ５、回路モジュール６などにより一体的に構成されている。 [Configuration of Example 1]
The structure of the air flow rate measuring apparatus 1 of Example 1 is demonstrated using FIGS.
The air flow rate measuring device 1 is, for example, an air flow meter that measures the intake air amount of an automobile engine, and is attached to a duct 2 connected to the downstream side of the air cleaner.
The air flow rate measuring device 1 is integrally configured by a housing 3, a flow rate sensor 4, a temperature sensor 5, a circuit module 6, and the like described below.

ハウジング３は、内部に、ダクト２内に形成される主流路９を流れる吸入空気の一部を取り込むバイパス流路１０と、バイパス流路１０から分岐して、バイパス流路１０を流れる空気の一部を取り込むサブバイパス流路１１とが形成されている。 The housing 3 includes a bypass channel 10 that takes in part of the intake air that flows through the main channel 9 formed in the duct 2, and one of the air that branches from the bypass channel 10 and flows through the bypass channel 10. And a sub-bypass passage 11 for taking in the portion.

バイパス流路１０は、ハウジング３の主流上流側面に開口するバイパス入口１３と、ハウジング３の主流下流側面に開口するバイパス出口１４とを有し、バイパス入口１３からバイパス出口１４に向かって主流方向に直線状に流路が形成されている（図１参照）。
また、図２に示すように、バイパス入口１３とバイパス出口１４とは、ダクト２の主流方向から見て略同じ位置でかつダクト２の中央近傍に設けられる。 The bypass flow path 10 includes a bypass inlet 13 that opens to the mainstream upstream side surface of the housing 3 and a bypass outlet 14 that opens to the mainstream downstream side surface of the housing 3, and in the mainstream direction from the bypass inlet 13 toward the bypass outlet 14. A flow path is formed in a straight line (see FIG. 1).
As shown in FIG. 2, the bypass inlet 13 and the bypass outlet 14 are provided at substantially the same position when viewed from the main flow direction of the duct 2 and in the vicinity of the center of the duct 2.

すなわち、主流の任意の径方向（図示上下）を高さ方向とし、高さ方向に直交する主流の径方向を幅方向（図示左右）としたときに、バイパス入口１３とバイパス出口１４とは、ダクト２内における高さ方向と幅方向の位置がほぼ同じであり、ダクト２の高さ方向と幅方向の中心位置近傍に位置している。 That is, when the arbitrary radial direction of the main flow (up and down in the drawing) is the height direction and the radial direction of the main flow perpendicular to the height direction is the width direction (left and right of the drawing), the bypass inlet 13 and the bypass outlet 14 are The positions in the height direction and the width direction in the duct 2 are substantially the same, and are located in the vicinity of the center position in the height direction and the width direction of the duct 2.

サブバイパス流路１１は、バイパス流路１０から分岐するサブバイパス入口１６と、バイパス出口１４の周囲に形成されて主流下方に向かって開口するサブバイパス出口１７とを有し、サブバイパス入口１６とサブバイパス出口１７との間で空気の流れをＵターンさせる流路形状に形成されている。 The sub-bypass channel 11 includes a sub-bypass inlet 16 branched from the bypass channel 10 and a sub-bypass outlet 17 formed around the bypass outlet 14 and opening downward in the mainstream. It is formed in a flow path shape that makes a U-turn of the air flow between the sub-bypass outlet 17.

具体的には、図１に示すように、サブバイパス流路１１は、サブバイパス入口１６から流入した空気を主流の径方向外側（高さ方向上側、図示上方）へ向かわせる第１流路２０、その後、主流上流側に向かわせる第２流路２１、その後、主流の径方向内側（高さ方向下側、図示下方）へ向かわせる第３流路２２、その後、主流下流側に向かわせてバイパス出口１４から空気を流出させる第４流路２３を有している。 Specifically, as shown in FIG. 1, the sub-bypass channel 11 is a first channel 20 that directs the air flowing in from the sub-bypass inlet 16 toward the radially outer side of the mainstream (upward in the height direction, upward in the drawing). Then, the second flow path 21 is directed to the upstream side of the main flow, the third flow path 22 is then directed to the radially inner side of the main flow (the lower side in the height direction, the lower side in the drawing), and is then directed to the downstream side of the main flow. A fourth flow path 23 through which air flows out from the bypass outlet 14 is provided.

第４流路２３は、バイパス流路１０の幅方向の両側にそれぞれ設けられ、サブバイパス出口１７は、ハウジング３の幅方向の両側部においてバイパス出口１４の幅方向両側（図示左右）に主流下流に向かって開口している（図３、４参照）。すなわち、第３流路２２がサブバイパス流下流で幅方向に２つに分岐して、それぞれ左右の第４流路２３に空気を流し、それぞれ左右のバイパス出口１４から空気が流出する構成となっている。 The fourth flow paths 23 are respectively provided on both sides in the width direction of the bypass flow path 10, and the sub-bypass outlets 17 are mainstream downstream on both sides in the width direction (left and right in the drawing) of the bypass outlet 14 at both sides in the width direction of the housing 3 (See FIGS. 3 and 4). That is, the third flow path 22 is branched into two in the width direction downstream of the sub-bypass flow, and air flows to the left and right fourth flow paths 23, respectively, and the air flows out from the left and right bypass outlets 14, respectively. ing.

また、サブバイパス出口１７は、バイパス出口１４に幅方向に近接して設けられるとともに、バイパス出口１４の高さ方向の位置と略同じになるように設けられる（図３参照）。すなわち、バイパス出口１４とサブバイパス出口１７とはダクト２内における高さ方向および幅方向の位置がほぼ同じになるように設けられる。 The sub-bypass outlet 17 is provided close to the bypass outlet 14 in the width direction, and is provided so as to be substantially the same as the position of the bypass outlet 14 in the height direction (see FIG. 3). That is, the bypass outlet 14 and the sub bypass outlet 17 are provided so that the positions in the height direction and the width direction in the duct 2 are substantially the same.

上述のように、バイパス入口１３とバイパス出口１４とは、ダクト２内における高さ方向と幅方向の位置がほぼ同じであり、ダクト２の高さ方向と幅方向の中心位置近傍に位置している。このため、バイパス入口１３とバイパス出口１４とサブバイパス出口１７は、ダクト２の主流方向から見て略同じ位置でかつダクト２の中央近傍に設けられることになる（図２参照）。 As described above, the bypass inlet 13 and the bypass outlet 14 are substantially the same in the height direction and the width direction in the duct 2 and are located near the center position in the height direction and the width direction of the duct 2. Yes. For this reason, the bypass inlet 13, the bypass outlet 14, and the sub-bypass outlet 17 are provided at substantially the same position when viewed from the main flow direction of the duct 2 and in the vicinity of the center of the duct 2 (see FIG. 2).

流量センサ４はサブバイパス流路１１の第２流路２１（Ｕターンの頂点部分）に配置されており、サブバイパス流路１１を流れる空気の流量を計測して電気的な信号（例えば電圧信号）として出力するものである（図１参照）。例えば、半導体基板の表面に薄膜抵抗体で形成された発熱素子と感温素子とを有し、これらの素子が回路モジュール６に内蔵される回路基板（図示せず）に接続されている。
温度センサ５は、主流路９を流れる吸入空気の温度を検出するためのものであり、回路モジュール６に内蔵される回路基板に接続されている。 The flow rate sensor 4 is disposed in the second flow path 21 (the apex portion of the U-turn) of the sub bypass flow path 11, and measures the flow rate of the air flowing through the sub bypass flow path 11 to generate an electrical signal (for example, a voltage signal). ) (See FIG. 1). For example, the surface of the semiconductor substrate has a heating element and a temperature sensitive element formed of a thin film resistor, and these elements are connected to a circuit board (not shown) built in the circuit module 6.
The temperature sensor 5 is for detecting the temperature of the intake air flowing through the main flow path 9 and is connected to a circuit board built in the circuit module 6.

回路モジュール６は、ハウジング３の上部に一体的に設けられ、ダクト２に取り付けられた状態ではダクト２の外側に配置される（図１、２参照）。
回路モジュール６の内部には、流量センサ４、温度センサ５への通電を制御するための回路基板が収容されている。 The circuit module 6 is integrally provided on the upper portion of the housing 3 and is disposed outside the duct 2 when attached to the duct 2 (see FIGS. 1 and 2).
The circuit module 6 accommodates a circuit board for controlling energization to the flow sensor 4 and the temperature sensor 5.

〔ダスト分離について〕
主流路９を流れる空気にはダストが含まれるが、バイパス流路１０に取り込まれた空気は、バイパス流路１０を直線状に通過するため、ダストは慣性力によってバイパス流路１０を直進する。従って、バイパス流路１０とサブバイパス流路１１との分岐でダストは分離されて、サブバイパス入口１６からはダストではなく空気のみが流入する。 [Dust separation]
Dust is contained in the air flowing through the main flow path 9, but since the air taken into the bypass flow path 10 passes straight through the bypass flow path 10, the dust travels straight through the bypass flow path 10 due to inertial force. Accordingly, dust is separated at the branch of the bypass flow path 10 and the sub bypass flow path 11, and only air, not dust, flows from the sub bypass inlet 16.

〔実施例１の特徴〕
空気流量測定装置１では、主流方向において、バイパス出口１４は、サブバイパス出口１７よりも下流に開口している（図４、５参照）。
そして、ダクト２内の主流に逆流が生じた場合に、バイパス出口１４から流出したダストの進路をサブバイパス出口１７を避ける方向に向かわせるダスト跳ね手段（後に詳述する）を備える。 [Features of Example 1]
In the air flow rate measuring device 1, the bypass outlet 14 opens downstream from the sub-bypass outlet 17 in the main flow direction (see FIGS. 4 and 5).
And when the backflow arises in the main flow in the duct 2, the dust bounce means (it mentions later in detail) which turns the course of the dust which flowed out from the bypass outlet 14 in the direction which avoids the sub bypass outlet 17 is provided.

すなわち、逆流が生じた際に、サブバイパス出口１７を回避するような流線を生じさせるために、ダクト２の主流方向におけるバイパス出口１４とサブバイパス出口１７との間でハウジング３の外周面上に形成された段差２５をダスト跳ね手段として備える（図４、５参照）。
なお、段差２５は、ハウジング３の幅方向の両側面に形成され、例えば、主流方向に垂直で、主流下流を向いた平面を有する。 That is, on the outer peripheral surface of the housing 3 between the bypass outlet 14 and the sub bypass outlet 17 in the main flow direction of the duct 2 in order to generate a streamline that avoids the sub bypass outlet 17 when a reverse flow occurs. Are provided as dust splashing means (see FIGS. 4 and 5).
In addition, the level | step difference 25 is formed in the both sides | surfaces of the width direction of the housing 3, for example, has a plane perpendicular | vertical to the mainstream direction and facing the mainstream downstream.

具体的には、図５に示すように、バイパス流路１０の下流部分の外郭をなすハウジング部分は、主流上流に向かうにつれて幅広になるテーパ２７を有している。そして、バイパス流路１０の中流部分の外郭をなすハウジング部分は、テーパ２７の主流上流側に段差２５を介して幅が拡大する幅広部２８を有する。そして、幅広部２８の幅方向左右にサブバイパス出口１７が設けられている。 Specifically, as shown in FIG. 5, the housing portion that forms the outer portion of the downstream portion of the bypass flow path 10 has a taper 27 that becomes wider toward the mainstream upstream. The housing portion that forms the outline of the midstream portion of the bypass flow path 10 has a wide portion 28 whose width is increased via a step 25 on the upstream side of the main flow of the taper 27. Sub-bypass outlets 17 are provided on the left and right sides of the wide portion 28 in the width direction.

図３、図４に示すように、段差２５の位置は、ダクト２の主流方向から見て、バイパス入口１３、バイパス出口１４、およびサブバイパス出口１７と略同じ位置でかつダクト２の中央近傍に設けられている。
また、段差２５の高さ方向（図示上下方向）の長さは、バイパス出口１４の高さ方向の長さよりも大きく、サブバイパス出口１７の高さ方向の長さとほぼ同じ程度に設けられている。 As shown in FIGS. 3 and 4, the position of the step 25 is substantially the same as the bypass inlet 13, the bypass outlet 14, and the sub-bypass outlet 17 as viewed from the main flow direction of the duct 2, and in the vicinity of the center of the duct 2. Is provided.
The height of the step 25 in the height direction (the vertical direction in the figure) is larger than the length of the bypass outlet 14 in the height direction, and is approximately the same as the length of the sub bypass outlet 17 in the height direction. .

〔実施例１の作用効果〕
実施例１の空気流量測定装置１は、ダクト２内の主流に逆流が生じた場合に、バイパス出口１４から流出したダストの進路をサブバイパス出口１７を避ける方向に向かわせるダスト跳ね手段としての段差２５を備える。 [Effects of Example 1]
The air flow rate measuring apparatus 1 according to the first embodiment has a step as dust splashing means for directing the course of dust flowing out from the bypass outlet 14 in a direction avoiding the sub-bypass outlet 17 when a backflow occurs in the main flow in the duct 2. 25.

ダクト２内の主流に逆流を含む脈動が生じると、バイパス出口１４から流出したダストが、逆流に乗って、サブバイパス出口１７に向かって進もうとする（図５参照）。
しかし、段差２５にダストが衝突して跳ね上がることで、ダストは進路を変えられ、幅方向においてサブバイパス出口１７より外側に散らされる。 When a pulsation including a reverse flow occurs in the main flow in the duct 2, the dust flowing out from the bypass outlet 14 rides on the reverse flow and proceeds toward the sub-bypass outlet 17 (see FIG. 5).
However, when the dust collides with the step 25 and jumps up, the course of the dust is changed and scattered outside the sub-bypass outlet 17 in the width direction.

これにより、ダストがサブバイパス出口１７からサブバイパス流路１１に侵入するのを防ぐことができるため、サブバイパス流路１１内に配置された流量センサ４にダストが到達して破壊する虞がなくなる。その上、ハウジング３の外周面に段差２５を形成するという簡易な方法でダストの侵入を防ぐことができる。 Accordingly, dust can be prevented from entering the sub-bypass channel 11 from the sub-bypass outlet 17, so that there is no possibility that the dust reaches the flow rate sensor 4 arranged in the sub-bypass channel 11 and is destroyed. . In addition, dust can be prevented from entering by a simple method of forming the step 25 on the outer peripheral surface of the housing 3.

また、段差２５は、逆流が生じた際に、サブバイパス出口１７を回避するような流線を生じさせるために、サブバイパス出口１７に逆流による動圧を受けにくくすることができる。このため、流量センサ４の計測に脈動の影響を生じにくくなる。 Further, the step 25 can make the sub-bypass outlet 17 less susceptible to dynamic pressure due to the backflow in order to generate a streamline that avoids the sub-bypass outlet 17 when the backflow occurs. For this reason, it becomes difficult to produce the influence of pulsation on the measurement of the flow sensor 4.

また、実施例１の空気流量測定装置１では、バイパス流路１０が、バイパス入口１３から主流方向に直線状に形成されており、バイパス入口１３、バイパス出口１４、サブバイパス出口１７、および段差２５が、ダクト２の主流方向から見て、略同じ位置で且つダクト２の中央近傍にある。
バイパス流路１０がバイパス入口１３から主流方向に直線状に形成され、バイパス入口１３とバイパス出口１４とがダクト２の主流方向から見て略同じ位置にあるならば、ダストは慣性力によって直進するためサブバイパス流路１１とバイパス流路１０との分岐（サブバイパス入口１６）でダスト分離することができる。 Further, in the air flow measuring device 1 of the first embodiment, the bypass flow path 10 is formed in a straight line from the bypass inlet 13 in the main flow direction, and the bypass inlet 13, the bypass outlet 14, the sub-bypass outlet 17, and the step 25. However, when viewed from the main flow direction of the duct 2, they are at substantially the same position and in the vicinity of the center of the duct 2.
If the bypass channel 10 is formed in a straight line from the bypass inlet 13 in the main flow direction, and the bypass inlet 13 and the bypass outlet 14 are at substantially the same position when viewed from the main flow direction of the duct 2, the dust travels straight by inertial force. Therefore, dust can be separated at the branch (sub-bypass inlet 16) between the sub-bypass channel 11 and the bypass channel 10.

また、バイパス入口１３とサブバイパス出口１７が、ダクト２の主流方向から見て、略同じ位置で且つダクト２の中央近傍に位置するので、偏流の影響を受けにくく、流量センサ４による測定結果が安定する。
また、バイパス出口１４、サブバイパス出口１７、および段差２５がダクト２の主流方向から見て略同じ位置にあるので、逆流により、サブバイパス出口１７からダストが侵入するのを確実に防止することができる。 Further, since the bypass inlet 13 and the sub-bypass outlet 17 are located at substantially the same position and in the vicinity of the center of the duct 2 when viewed from the main flow direction of the duct 2, it is difficult to be affected by the drift and the measurement result by the flow sensor 4 is Stabilize.
Further, since the bypass outlet 14, the sub bypass outlet 17, and the step 25 are located at substantially the same position when viewed from the main flow direction of the duct 2, it is possible to reliably prevent dust from entering from the sub bypass outlet 17 due to the reverse flow. it can.

すなわち、バイパス入口１３、バイパス出口１４、サブバイパス出口１７、および段差２５が、ダクト２の主流方向から見て、略同じ位置で且つダクト２の中央近傍にあることにより、流速測定に偏流の影響を与えないようにするとともに、ダストの効果的な分離、ダストのサブバイパス流路内への侵入防止を同時に達成することができる。 That is, the bypass inlet 13, the bypass outlet 14, the sub bypass outlet 17, and the step 25 are located at substantially the same position and near the center of the duct 2 when viewed from the main flow direction of the duct 2. In addition, effective separation of dust and prevention of intrusion of dust into the sub-bypass channel can be achieved at the same time.

〔変形例〕
実施例１では、段差２５は、主流方向に垂直で主流下流を向いた平面を有していたが、平面に限らず、曲面でもよい。また、主流方向に垂直に限らず傾斜したテーパ面でもよい。
その際、曲面の曲率やテーパの傾斜角度や寸法などは、逆流が生じた場合にバイパス出口１４から流出したダストの進路をサブバイパス出口１７を避ける方向に向かわせることができるように適宜設定される。また、段差２５をハウジング３外周面に突出する突起として設けてもよい。 [Modification]
In the first embodiment, the step 25 has a plane perpendicular to the mainstream direction and facing the mainstream downstream, but is not limited to a plane and may be a curved surface. Further, it may be a tapered surface that is not limited to being perpendicular to the mainstream direction.
At that time, the curvature of the curved surface, the inclination angle and the size of the taper, etc. are appropriately set so that the path of the dust flowing out from the bypass outlet 14 can be directed in the direction avoiding the sub-bypass outlet 17 when a reverse flow occurs. The Further, the step 25 may be provided as a protrusion protruding on the outer peripheral surface of the housing 3.

１ 空気流量測定装置
２ ダクト
３ ハウジング
４ 流量センサ
１０ バイパス流路
１１ サブバイパス流路
１３ バイパス入口（バイパス流路の入口）
１４ バイパス出口（バイパス流路の出口）
１６ サブバイパス入口（バイパス流路とサブバイパス流路の分岐）
１７ サブバイパス出口（サブバイパス流路の出口）
２５ 段差（ダスト跳ね手段） DESCRIPTION OF SYMBOLS 1 Air flow measuring device 2 Duct 3 Housing 4 Flow sensor 10 Bypass flow path 11 Sub bypass flow path 13 Bypass inlet (inlet of bypass flow path)
14 Bypass outlet (bypass channel outlet)
16 Sub-bypass entrance (branch of bypass and sub-bypass channels)
17 Sub-bypass outlet (Sub-bypass outlet)
25 Level difference (Dust splashing means)

Claims (3)

ダクトの内部を流れる空気の一部を取り込むバイパス流路と、前記バイパス流路より分岐して設けられて前記バイパス流路を流れる空気の一部を取り込むサブバイパス流路とが形成されたハウジングと、
前記サブバイパス流路に配設され、前記サブバイパス流路を流れる空気の流量を測定する流量センサとを備え、
前記バイパス流路と前記サブバイパス流路との分岐で、ダクト内部を流れる空気に含まれるダストを分離して、ダストを前記バイパス流路側に流す空気流量測定装置であって、
前記ダクトの主流方向において、前記バイパス流路の出口は、前記サブバイパス流路の出口よりも下流に開口しており、
前記ダクト内の主流に逆流が生じた場合に前記バイパス流路の出口から流出したダストの進路を前記サブバイパス流路の出口を避ける方向に向かわせるダスト跳ね手段を備えることを特徴とする空気流量測定装置。 A housing formed with a bypass flow path for taking in part of the air flowing inside the duct, and a sub-bypass flow path that is branched from the bypass flow path and takes in a part of the air flowing through the bypass flow path; ,
A flow rate sensor disposed in the sub-bypass channel and measuring a flow rate of air flowing through the sub-bypass channel;
At the branch of the bypass flow path and the sub bypass flow path, the dust contained in the air flowing inside the duct is separated, and the air flow rate measuring device for flowing the dust to the bypass flow path side,
In the main flow direction of the duct, the outlet of the bypass channel opens downstream from the outlet of the sub-bypass channel,
An air flow rate characterized by comprising dust bounce means for directing the course of dust flowing out from the outlet of the bypass passage in a direction avoiding the outlet of the sub-bypass passage when a reverse flow occurs in the main flow in the duct. measuring device. 請求項１に記載の空気流量測定装置において、
前記ダスト跳ね手段は、前記主流方向における前記バイパス流路の出口と前記サブバイパス流路の出口との間で、前記ハウジングの外周面上に形成された段差であることを特徴とする空気流量測定装置。 The air flow rate measuring device according to claim 1,
The dust splashing means is a step formed on the outer peripheral surface of the housing between the outlet of the bypass channel and the outlet of the sub-bypass channel in the main flow direction. apparatus. 請求項１または請求項２に記載の空気流量測定装置において、
前記バイパス流路は、前記バイパス流路の入口から前記主流方向に直線状に形成されており、
前記バイパス流路の入口、前記バイパス流路の出口、前記サブバイパス流路の出口、および前記ダスト跳ね手段は、前記ダクトの主流方向から見て、互いに略同じ位置で且つ前記ダクトの中央近傍に位置することを特徴とする空気流量測定装置。 In the air flow rate measuring device according to claim 1 or 2,
The bypass channel is formed linearly in the main flow direction from the inlet of the bypass channel,
The inlet of the bypass channel, the outlet of the bypass channel, the outlet of the sub-bypass channel, and the dust splashing means are substantially at the same position and near the center of the duct as viewed from the main flow direction of the duct. An air flow rate measuring device characterized by being located.
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