JP2006162296A - Impeller flow meter - Google Patents

Impeller flow meter Download PDF

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JP2006162296A
JP2006162296A JP2004350216A JP2004350216A JP2006162296A JP 2006162296 A JP2006162296 A JP 2006162296A JP 2004350216 A JP2004350216 A JP 2004350216A JP 2004350216 A JP2004350216 A JP 2004350216A JP 2006162296 A JP2006162296 A JP 2006162296A
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impeller
flow meter
heat
flowmeter
detection element
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Yoshitaka Kikuchi
良高 菊地
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Tokyo Keiso Co Ltd
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Tokyo Keiso Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an impeller flow meter with a simple constitution which is capable of reducing a system cost and running cost. <P>SOLUTION: The variation of magnetic flux from a magnet 5 provided on a blade 4a of an impeller 4 is detected with a magnetic detector element 6 such as Hall IC provided on the flow meter body 1 outside the flow path to detect the revolution number of the impeller and flow rate of fluid is measured from the revolution number of the impeller. The impeller flow meter keeps one end of a rodlike heat absorbing member 10 with a large heat conductivity in contact with the magnetic detector element 6, the other end connected to a radiation fin 11 contacting the air. Between the radiation fins and the flow meter body, an insulator 17 consisting of the first thermal insulator on the flow meter side and the second insulator on the radiation fin side and an insulation space formed between the first and the second insulators are put. The radiation fins are attached to the flow meter body 1 with screws made of a stuff having insulation performance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は被測定流体の流量を流路内に設けた羽根車の回転数から求める羽根車流量計に関し、より詳しくは高温の被測定流体の流量測定にも十分な測定性能を発揮できるようにした羽根車流量計に関する。   The present invention relates to an impeller flow meter that obtains the flow rate of a fluid to be measured from the number of revolutions of an impeller provided in the flow path, and more specifically, can exhibit sufficient measurement performance for measuring the flow rate of a high temperature fluid to be measured. Related to the impeller flowmeter.

羽根車流量計は、流路内を流れる被測定流体の流体圧力によって軸まわりに回転させられる羽根車の回転数から被測定流体の流量を求めるものであり、羽根車の回転数を検出する手段としては、羽根車の羽根にマグネットを内蔵せしめ、このマグネットの回転軌跡近傍の流量計本体側に設けたホールIC等の磁気検出素子により、羽根車の回転に伴うマグネットからの磁束の変化を検出して羽根車の回転数を求め、この羽根車の回転数から被測定流体の流量を得ている(例えば、特許文献1、2参照)。   The impeller flowmeter is a means for obtaining the flow rate of the fluid to be measured from the rotational speed of the impeller rotated around the axis by the fluid pressure of the fluid to be measured flowing in the flow path, and means for detecting the rotational speed of the impeller The magnet is built in the blade of the impeller, and the change of magnetic flux from the magnet accompanying the rotation of the impeller is detected by the magnetic detection element such as Hall IC provided on the flowmeter body side near the rotation locus of this magnet. Thus, the rotational speed of the impeller is obtained, and the flow rate of the fluid to be measured is obtained from the rotational speed of the impeller (see, for example, Patent Documents 1 and 2).

ところで、前記磁気検出素子は一般的に高温条件下では性能を十分に発揮できなかったり、破損したりするおそれがあり、市販されているホールICの動作温度は例えば−30℃〜+115℃程度であって、必然的に被測定流体の温度もこのホールICの動作温度に制限される。   By the way, in general, the magnetic sensing element may not be able to exhibit its performance sufficiently under high temperature conditions or may be damaged. The operating temperature of a commercially available Hall IC is, for example, about −30 ° C. to + 115 ° C. Inevitably, the temperature of the fluid to be measured is also limited to the operating temperature of the Hall IC.

そして、例えば100℃以上の被測定流体の流量を測定する場合、従来はホールICの近傍に冷却用の電動ファンを設けている。   For example, when measuring the flow rate of the fluid to be measured at 100 ° C. or higher, a cooling electric fan is conventionally provided in the vicinity of the Hall IC.

しかし、電動ファンの動作用の電力が必要となるとともに電動ファンを設ける分、装置コストが嵩み、装置寸法も大となるという問題がある。
特開昭63−100326号(第1〜4頁および第1〜3図) 特開昭63−100327号(第1〜4頁および第1〜3図)
However, there is a problem that electric power for operating the electric fan is required and the cost of the apparatus is increased and the apparatus size is increased by the provision of the electric fan.
JP-A-63-100326 (pages 1 to 4 and FIGS. 1 to 3) JP-A-63-100327 (pages 1 to 4 and FIGS. 1 to 3)

本発明の目的とするところは、構成が簡単で装置コスト、しかもランニングコストの低減も期すことのできる羽根車流量計を提供することにある。   An object of the present invention is to provide an impeller flow meter that has a simple configuration, can reduce apparatus cost, and can reduce running cost.

上記目的を達成するために、本発明に係る羽根車流量計は、流入口から流出口に至る流路内を流れる被測定流体によって羽根車が回転させられ、同羽根車の羽根に設けたマグネットからの磁束変化を流路の外における流量計本体に設けた磁気検出素子で検出して羽根車の回転数を検知し、この羽根車の回転数から被測定流体の流量を求める羽根車流量計において、前記磁気検出素子に、熱伝導率の大なる熱吸収部材を密着せしめてなる構成のものとしてある。   In order to achieve the above object, an impeller flowmeter according to the present invention is a magnet provided on a blade of the impeller, the impeller being rotated by a fluid to be measured flowing in a flow path from the inlet to the outlet. An impeller flowmeter that detects the flow rate of the fluid to be measured from the rotational speed of the impeller by detecting the rotational speed of the impeller by detecting the change in magnetic flux from the magnetic flow sensor in the flowmeter body outside the flow path In this embodiment, a heat absorption member having a high thermal conductivity is brought into close contact with the magnetic detection element.

また、前記熱吸収部材を棒状のもので構成し、一端を磁気検出素子に密着せしめた熱吸収部材の他端を、外気に接触する放熱フィンに接続し、前記放熱フィンと前記流量計本体との間に、流量計本体側の第1断熱部材と、放熱フィン側の第2断熱部材と、第1、第2の断熱部材との間に形成した断熱空間とよりなる断熱部を介在せしめ、前記放熱フィンを、断熱性を有する素材よりなるねじで流量計本体に取り付けたものとしてある。   Further, the heat absorbing member is formed of a rod-shaped member, and the other end of the heat absorbing member having one end in close contact with the magnetic detection element is connected to a heat radiating fin in contact with outside air, and the heat radiating fin, the flow meter body, In between, the heat insulation part which consists of the heat insulation space formed between the 1st heat insulation member by the side of a flow meter main part, the 2nd heat insulation member by the side of a radiating fin, and the 1st and 2nd heat insulation members, The heat dissipating fin is attached to the main body of the flowmeter with a screw made of a heat insulating material.

さらに、前記磁気検出素子の表面における前記熱吸収部材との接触部以外の部分を断熱材で覆って、磁気検出素子と流量計本体とが接触しないように構成したものとしてある。   Further, a portion other than the contact portion with the heat absorbing member on the surface of the magnetic detection element is covered with a heat insulating material so that the magnetic detection element and the flowmeter main body do not come into contact with each other.

本発明によれば、被測定流体から流量計本体に伝導した熱は磁気検出素子まわりの断熱材によって磁気検出素子に伝導するのが抑制され、磁気検出素子に伝導した熱はこの磁気検出素子に密着された吸熱部材によって吸収され、したがって磁気検出素子が高温になって破損したり、流量計の測定性能が低下したりするのが防止される。   According to the present invention, the heat conducted from the fluid to be measured to the flowmeter body is suppressed from being conducted to the magnetic detection element by the heat insulating material around the magnetic detection element, and the heat conducted to the magnetic detection element is applied to the magnetic detection element. Therefore, the magnetic sensing element is prevented from being damaged due to high temperature and the measurement performance of the flow meter being deteriorated.

また、前記磁気検出素子から吸熱部材に伝導した熱は放熱フィンに伝導し、放熱フィンは外気との接触によって熱を放出する。
さらに、放熱フィンは断熱性を有するねじによって流量計本体に取り付けられ、また流量計本体との間には断熱部を設けてあるので、放熱フィンは磁気検出素子からの熱だけを効率良く外部に放出し、しかも被測定流体の温度を低下させてしまうおそれがまずない。
The heat conducted from the magnetic detection element to the heat absorbing member is conducted to the heat radiating fin, and the heat radiating fin releases heat by contact with the outside air.
Furthermore, since the heat radiating fin is attached to the flow meter main body by a screw having heat insulation properties, and a heat insulating portion is provided between the heat flow fin main body, the heat radiating fin efficiently only sends heat from the magnetic detection element to the outside. There is almost no possibility of releasing and lowering the temperature of the fluid to be measured.

したがって、従来のもののように冷却用の電動ファンを設けなくても高温の被測定流体の流量測定を高精度に行うことができ、しかも構成が簡単で装置寸法を小型のものにすることができる。
また、上記電動ファンの駆動電力も不要であり、ランニングコストの低減も期すことができる。
Therefore, it is possible to measure the flow rate of a high temperature fluid to be measured with high accuracy without providing an electric fan for cooling unlike the conventional one, and the configuration can be simplified and the apparatus size can be reduced. .
Further, the driving power of the electric fan is not necessary, and the running cost can be reduced.

以下、本発明に係る羽根車流量計の実施例を添付図面に示す具体例に基づいて詳細に説明する。
流量計本体1は、流入口2aから流出口2bに至る被測定流体の流路2の途中に、羽根車室3を有し、この羽根車室内に羽根車4を設けてあって、マグネット5をそれぞれ内蔵する羽根4a、4aの先端部が流路2内に臨み、軸4bまわりにフリーに回転できるように構成されている。
Embodiments of an impeller flowmeter according to the present invention will be described in detail below based on specific examples shown in the accompanying drawings.
The flow meter main body 1 has an impeller chamber 3 in the middle of the flow path 2 of the fluid to be measured extending from the inlet 2a to the outlet 2b. The impeller 4 is provided in the impeller chamber, and a magnet 5 Are configured so that the tip portions of the blades 4a and 4a that respectively house the blades face the flow path 2 and can freely rotate around the shaft 4b.

上記羽根車は流路2内を流過する被測定流体の流体圧力によって軸4bまわりに回転させられ、この回転に伴ってマグネット5も円形軌道上を回転させられる。   The impeller is rotated around the shaft 4b by the fluid pressure of the fluid to be measured flowing through the flow path 2, and the magnet 5 is also rotated on the circular track along with the rotation.

そして、上記マグネットの回転軌跡近傍の流量計本体1には、流量計本体1の壁1aにて流路と区画された外側に磁気検出素子たるホールIC6を設けてあり、このホールICによってマグネット5からの磁束密度が検出され、したがって羽根車の回転はホールICにて検出される磁束の変化として得られ、信号線7によって外部に出力される。   The flow meter body 1 in the vicinity of the rotation trajectory of the magnet is provided with a Hall IC 6 serving as a magnetic detection element on the outside of the flow meter body 1 separated from the flow path by the wall 1a. Therefore, the rotation of the impeller is obtained as a change in magnetic flux detected by the Hall IC, and is output to the outside by the signal line 7.

しかして、前記ホールIC6は例えばポリフェニレンサルファイド樹脂等の断熱材よりなるホルダ8の先端凹部8a内にこれまた断熱材たるシリコーン樹脂9でポッティングしてある。   Thus, the Hall IC 6 is potted with the silicone resin 9 which is also a heat insulating material in the recess 8a of the holder 8 made of a heat insulating material such as polyphenylene sulfide resin.

そして前記ホルダの凹部8aにあけた孔を貫通する吸熱部材10の端面をホールIC6の裏面すなわち前記流路2とは反対側の面に密着させてあり、ホールIC6と吸熱部材との間には熱伝導率の大なる接着剤や放熱グリースを介在させてある。   The end face of the heat absorbing member 10 penetrating the hole formed in the recess 8a of the holder is in close contact with the back surface of the Hall IC 6, that is, the surface opposite to the flow path 2, and between the Hall IC 6 and the heat absorbing member. An adhesive or thermal grease with high thermal conductivity is interposed.

前記吸熱部材10は、例えば銅やアルミニウム等の熱伝導率の大なる材料よりなる棒材で構成してあって、ホールIC6と密着せしめた端部とは反対側の端部を、熱伝導率の大なる接着剤や放熱グリースによって放熱フィン11に密着するように接続してある。   The heat-absorbing member 10 is made of a rod made of a material having a high thermal conductivity such as copper or aluminum, and the end opposite to the end in close contact with the Hall IC 6 is provided with a thermal conductivity. It is connected so as to be in close contact with the heat radiating fins 11 with a large amount of adhesive or heat radiating grease.

上記放熱フィン11は、例えばアルミニウム製のものとしてあって、放熱面が外気に触れるようにして前記流量計本体1にねじ12で取り付けてあり、ねじは例えばポリフェニレンサルファイド樹脂等の断熱材で構成してあって、流量計本体からの熱がねじを介して放熱フィンに伝導しないようにしてある。   The heat dissipating fins 11 are made of aluminum, for example, and are attached to the flowmeter main body 1 with screws 12 so that the heat dissipating surface is in contact with the outside air. The screws are made of a heat insulating material such as polyphenylene sulfide resin. Therefore, heat from the flowmeter body is not conducted to the heat radiating fins via the screws.

また、流量計本体1と放熱フィン11との間におけるねじ12のまわりには第1の断熱部材13と、スペーサ14と、第2の断熱部材15を介在せしめてあり、上記第1と第2の断熱部材およびスペーサ14によって形成される空間16よりなる断熱部17を設けてあって、流量計本体から放熱フィンへの熱伝導をより確実に防止できるようにしてある。
なお、上記第1と第2の断熱部材13、15は、例えばポリフェニレンサルファイド樹脂等の断熱材よりなる板材で構成してある。
A first heat insulating member 13, a spacer 14, and a second heat insulating member 15 are interposed around the screw 12 between the flow meter main body 1 and the heat radiating fins 11. The heat insulating portion 17 including the space 16 formed by the heat insulating member and the spacer 14 is provided, so that heat conduction from the flow meter main body to the heat radiating fin can be prevented more reliably.
In addition, the said 1st and 2nd heat insulation members 13 and 15 are comprised with the board | plate material which consists of heat insulating materials, such as polyphenylene sulfide resin, for example.

上述のように構成した本発明の羽根車流量計において、各部の温度を計測した試験結果のグラフを図3に示す。
上記試験においては、吸熱部材10を直径が4mmで長さ25mmの銅製のもの、放熱フィン11を放熱面積が70cm2のアルミニウム製のものとし、外気温度を30℃、被測定流体の温度を150℃として測定した。
In the impeller flowmeter of the present invention configured as described above, a graph of test results obtained by measuring the temperature of each part is shown in FIG.
In the above test, the endothermic member 10 is made of copper having a diameter of 4 mm and a length of 25 mm, the radiating fin 11 is made of aluminum having a radiating area of 70 cm 2 , the outside air temperature is 30 ° C., and the temperature of the fluid to be measured is 150. Measured as ° C.

同図3のグラフに示されるように、被測定流体からの熱によってホールIC6は70℃に維持され、十分な動作温度が確保されることがわかった。   As shown in the graph of FIG. 3, it was found that the Hall IC 6 was maintained at 70 ° C. by heat from the fluid to be measured, and a sufficient operating temperature was ensured.

さらに、外気温度の変化に伴ってホールIC6の温度がどのようになるかを検証することを目的として、上述した試験とは外気温度だけを変化させてホールIC6の温度変化を計測したところ、図4に示されるグラフの測定結果が得られた。   Furthermore, for the purpose of verifying how the temperature of the Hall IC 6 changes with a change in the outside air temperature, the above-described test is performed by measuring the temperature change of the Hall IC 6 while changing only the outside air temperature. The measurement result of the graph shown in FIG. 4 was obtained.

同図4のグラフに示されるように、外気温度が変化してもホールICの温度は十分に動作温度範囲内に維持されることがわかった。   As shown in the graph of FIG. 4, it was found that the Hall IC temperature was sufficiently maintained within the operating temperature range even when the outside air temperature changed.

上述した実施例の羽根車流量計においては、ホルダ8、ねじ12および第1、第2の断熱部材13、15はいずれもポリフェニレンサルファイド樹脂で構成してあるが、熱伝導率が小であって、電気絶縁性、耐熱性を有し、十分な構造強度が得られる材料であれば他の材料を使用する場合もある。   In the impeller flow meter of the embodiment described above, the holder 8, the screw 12, and the first and second heat insulating members 13 and 15 are all made of polyphenylene sulfide resin, but have a low thermal conductivity. Other materials may be used as long as they have electrical insulation properties and heat resistance and can provide sufficient structural strength.

本発明に係る羽根車流量計の縦断面図。The longitudinal section of the impeller flow meter concerning the present invention. 本発明に係る羽根車流量計の横断面図。The cross-sectional view of the impeller flowmeter according to the present invention. 流量計各部の温度を示すグラフ。The graph which shows the temperature of each part of a flow meter. 外気温度とホールIC温度との関係を示すグラフ。The graph which shows the relationship between outside temperature and Hall IC temperature.

符号の説明Explanation of symbols

1 流量計本体
2 流路
3 羽根車室
4 羽根車
5 マグネット
6 ホールIC
7 信号線
8 ホルダ
9 シリコーン樹脂
10 吸熱部材
11 放熱フィン
12 ねじ
13 第1の断熱部材
14 スペーサ
15 第2の断熱部材
16 断熱用の空間
17 断熱部
1 Flow meter body
2 Channel
3 impeller room
4 impeller
5 Magnet
6 Hall IC
7 signal lines
8 Holder
DESCRIPTION OF SYMBOLS 9 Silicone resin 10 Endothermic member 11 Radiation fin 12 Screw 13 1st heat insulation member 14 Spacer 15 2nd heat insulation member 16 Space for heat insulation 17 Heat insulation part

Claims (6)

流入口から流出口に至る流路内を流れる被測定流体によって羽根車が回転させられ、同羽根車の羽根に設けたマグネットからの磁束変化を流路の外における流量計本体に設けた磁気検出素子で検出して羽根車の回転数を検知し、この羽根車の回転数から被測定流体の流量を求める羽根車流量計において、前記磁気検出素子に、熱伝導率の大なる熱吸収部材を密着せしめてなる羽根車流量計。   The impeller is rotated by the fluid to be measured that flows in the flow path from the inlet to the outlet, and the magnetic flux change from the magnet provided on the impeller blade is detected in the flow meter body outside the flow path. In the impeller flowmeter that detects the rotational speed of the impeller by detecting with the element and obtains the flow rate of the fluid to be measured from the rotational speed of the impeller, a heat absorbing member having a large thermal conductivity is provided on the magnetic detection element. An impeller flow meter that adheres closely. 前記熱吸収部材を棒状のもので構成し、一端を磁気検出素子に密着せしめた熱吸収部材の他端を、外気に接触する放熱フィンに接続してなる請求項1に記載の羽根車流量計。   2. The impeller flow meter according to claim 1, wherein the heat absorbing member is formed of a rod-like member, and the other end of the heat absorbing member having one end in close contact with the magnetic detection element is connected to a heat radiating fin that contacts outside air. . 前記放熱フィンと前記流量計本体との間に断熱部を介在せしめてなる請求項2に記載の羽根車流量計。   The impeller flow meter according to claim 2, wherein a heat insulating portion is interposed between the heat radiation fin and the flow meter body. 前記断熱部を、流量計本体側の第1断熱部材と、放熱フィン側の第2断熱部材と、第1、第2の断熱部材との間に形成した断熱空間で構成してなる請求項3に記載の羽根車流量計。   The said heat insulation part is comprised by the heat insulation space formed between the 1st heat insulation member by the side of a flowmeter main body, the 2nd heat insulation member by the side of a radiation fin, and the 1st, 2nd heat insulation member. The impeller flow meter described in 1. 前記放熱フィンを、断熱性を有する素材よりなるねじで流量計本体に取り付けてなる請求項2乃至4に記載の羽根車流量計。   The impeller flowmeter according to claim 2, wherein the radiating fin is attached to the main body of the flowmeter with a screw made of a heat-insulating material. 前記磁気検出素子の表面における前記熱吸収部材との接触部以外の部分を断熱材で覆って、磁気検出素子と流量計本体とが接触しないように構成してなる請求項1に記載の羽根車流量計。   The impeller according to claim 1, wherein a portion of the surface of the magnetic detection element other than the contact portion with the heat absorbing member is covered with a heat insulating material so that the magnetic detection element and the flowmeter main body do not contact each other. Flowmeter.
JP2004350216A 2004-12-02 2004-12-02 Impeller flow meter Pending JP2006162296A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009100652A (en) * 2007-10-19 2009-05-14 Kyushu Univ Fluid feeding device and cell culture apparatus using the same
JP5043245B1 (en) * 2012-02-21 2012-10-10 Takahata Precision R&D Center株式会社 Flow sensor
JP2013181839A (en) * 2012-03-01 2013-09-12 Miura Co Ltd Vane wheel
JP2014158948A (en) * 2008-04-22 2014-09-04 Nestec Sa Modular assembly of beverage preparation machine
KR20150032293A (en) * 2012-07-02 2015-03-25 디그메사 에이지 Flowmeter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009100652A (en) * 2007-10-19 2009-05-14 Kyushu Univ Fluid feeding device and cell culture apparatus using the same
JP2014158948A (en) * 2008-04-22 2014-09-04 Nestec Sa Modular assembly of beverage preparation machine
JP5043245B1 (en) * 2012-02-21 2012-10-10 Takahata Precision R&D Center株式会社 Flow sensor
JP2013181839A (en) * 2012-03-01 2013-09-12 Miura Co Ltd Vane wheel
KR20150032293A (en) * 2012-07-02 2015-03-25 디그메사 에이지 Flowmeter
JP2015521746A (en) * 2012-07-02 2015-07-30 ディグメサ アーゲー Flowmeter
KR102027622B1 (en) * 2012-07-02 2019-10-01 디그메사 에이지 Flowmeter

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