JP2004233293A - Method for measuring drain flow rate and its flowmeter - Google Patents

Method for measuring drain flow rate and its flowmeter Download PDF

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Publication number
JP2004233293A
JP2004233293A JP2003024808A JP2003024808A JP2004233293A JP 2004233293 A JP2004233293 A JP 2004233293A JP 2003024808 A JP2003024808 A JP 2003024808A JP 2003024808 A JP2003024808 A JP 2003024808A JP 2004233293 A JP2004233293 A JP 2004233293A
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fluid
flow rate
liquid level
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Japanese (ja)
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Yasushi Fukunaga
裕史 福永
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Sanyo Special Steel Co Ltd
山陽特殊製鋼株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for measuring a drain flow rate of fluid using equipment even when a condition is nearly 0 differential pressure or no fluid is filled in a pipe and provide a flowmeter for the method. <P>SOLUTION: Drain flow rate of an oil pressure system can be measured without directly utilizing pressure or differential pressure in fluid, by making a plurality of small holes (n) in a measure 4 vertically with the same intervals, summing fluid flowing out of each of the small holes (n) and obtaining in advance relation between variation quantity of level Z of liquid surface 6 and flow rate Q flowing out of the measure, passing the fluid of the drain of the main oil pressure system, for example, in a pipe 9 of bypass line bypassing the on-line 8 of the drain of the oil pressure system and temporarily injecting from the bottom periphery wall of the measure 4 into the measure 4, calculating and knowing the liquid level Z of the fluid in the injected measure 4 using the distance from an ultrasonic distance meter 5 provided at the upper part of the liquid surface 6 and applying the liquid level Z to the relation of flow rate Q. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】 [0001]
【発明の属する技術分野】 BACKGROUND OF THE INVENTION
本発明は流体の流量の測定に用いるもので、特に流量計の入側と出側の圧力差がほとんど0の場合あるいは配管中が流体で満たされていない場合でも高い精度で検出できるドレン流量の測定方法およびその測定用の流量計に関し、特に、油圧システムのポンプのドレンの流量の測定に関する。 The present invention is intended to be used for measuring the flow rate of the fluid, the drain flow, especially when the pressure difference between the outlet side and inlet side of the flowmeter is almost zero or the piping can be detected with high accuracy even when not filled with fluid It relates measurement method and flow meter for the measurement, more particularly, to the measurement of the pump of the hydraulic system drain flow.
【0002】 [0002]
【従来の技術】 BACKGROUND OF THE INVENTION
従来から流体の流量を測定する方法として流量計がある。 There is a flow meter as a method for measuring the flow rate of fluid from the prior art. 流量計の種類として差圧式流量計、容積式流量計、面積式流量計、超音波式流量計がある。 Differential pressure type flowmeter as the type of flow meter, displacement meters, variable area flowmeter, there is an ultrasonic flowmeter. 差圧式流量計では流量計の入側と出側の圧力差すなわち差圧を利用したもので、このため差圧がほとんど0に近いところでは利用できない。 The differential pressure type flowmeter utilizes the pressure difference i.e. differential pressure outlet side and the inlet side of the flowmeter, Thus the differential pressure is not available at very close to zero. このような差圧がほとんど0の状態とは、例えば、配管中が流体で満たされていない状態をさす。 And such pressure difference is almost zero state, for example, refers to the state in which the piping is not filled with fluid. さらに、容積式流量計では流体の差圧によって生じる流体を送り出す回転子の回転を利用しているので、圧力がなく差圧が生じないところでは利用できない。 Further, since the volumetric flow meter utilizes the rotation of the rotor for feeding the fluid caused by the differential pressure of the fluid, not available where no pressure difference without pressure. 面積式流量計でも流量計の入側と出側の圧力差すなわち差圧を利用したものであるので、差圧がほとんど0に近いところでは利用できない。 Since in area flowmeter which utilizes the pressure difference i.e. differential pressure outlet side and the inlet side of the flowmeter, not available where the differential pressure is close almost to zero. また、超音波を利用して測定する超音波流量計では、精度が悪く、このため毎分数リットルの精度では測定することができない上に、やはり配管中がすべて流体で満たされていなければ測定することはできない。 Further, in the ultrasonic flow meter that measured using ultrasound, poor accuracy, since it is impossible to measure with this order per minute liters of precision, measuring unless also filled in the pipe in all fluid It is not possible.
【0003】 [0003]
本発明に近い技術例としては、液面を感知するためにフロート(浮き)を用いた例がある。 As art example close to the present invention, there is an example of using a float (float) for sensing the liquid level. すなわち、流量計入側が絞られており、差圧を利用してフロートを浮かしている(特許文献1参照)。 That is, the flow meter inlet side is throttled, are floated float by using a differential pressure (see Patent Document 1). さらに、フロートを利用して流量を測定するものとして、フロートの上下の頻度やインターバルで流量を測定するものでがある(特許文献2参照)。 Further, as by using a float to measure the flow rate, there is in that for measuring the flow rate in the upper and lower frequency and interval of the float (see Patent Document 2).
【0004】 [0004]
しかし、上記したように、これらの従来技術には、差圧がほとんど0の状態では、または、配管中が流体で満たされていなければ、測定できないという問題点があった。 However, as described above, these prior art, in the state of the differential pressure almost 0, or, in the pipe if filled with fluid, there is a problem that can not be measured.
【0005】 [0005]
【特許文献1】 [Patent Document 1]
特開平02―38816号公報【特許文献2】 JP 02-38816 [Patent Document 2]
特開昭61―288120号公報【0006】 JP-A-61-288120 Patent Publication No. [0006]
【発明が解決しようとする課題】 [Problems that the Invention is to Solve
本発明が解決しようとする課題は、上記の問題点を解決し、差圧がほとんど0の状態であっても、または、配管中が流体で満たされていなくても、ドレン流量を測定する方法およびそのための流量計を提供することである。 The method object of the present invention is to solve is to solve the problems described above, even when the differential pressure almost 0, or, in the piping is also not filled with fluid, to measure the drain flow and to provide a flow meter for this purpose.
【0007】 [0007]
【課題を解決するための手段】 In order to solve the problems]
上記の課題を解決するための本発明の手段は、請求項1の発明では、垂直方向に等間隔の複数個の小孔を開けた升を用意し、升内の流体の液面高さを液面上部に備えた超音波距離計からの距離から算出し、一方、予めそれぞれの小孔から流出する流体を合計した流量と液面高さとの関係を求めておき、流体装置のメインシステムの流体のオンラインの流体送給用のポンプのドレンからオンラインを外した迂回ラインの配管を配設し、該配管を升の底部周壁に等間隔で垂直方向の多数の小孔を有する升の底部側壁に接続して升の中に流体を注入、升の小孔から流体を迂回ラインの配管に流出して戻しながら升内の流体の液面高さを超音波距離計により測定し、該測定値から配管を流れる流量を知ることを特徴とするドレン流量の測定方法である The means of the present invention for solving the above problems, the invention of claim 1, prepared squares opened the equally spaced plurality of small holes in the vertical direction, the liquid level of the fluid in the boxes calculated from the distance from the ultrasonic distance meter provided in the liquid surface, whereas, to previously obtain the relationship of the flow rate and the liquid level which is the sum of fluid flowing from the advance each of the small holes of the main system of the fluid system piping bypass line disconnecting the line from the drain of the fluid line of the fluid feed pump for feeding disposed, the bottom side walls of the boxes with vertical many small holes at equal intervals to piping on the bottom wall of the boxes fluid into the boxes connected injected, the liquid level of the fluid in the boxes while returning the fluid from the small holes in the boxes to flow out to the piping bypassing line was measured by ultrasonic rangefinder, measured value is the measurement method of drain flow, characterized in that to know the flow through the pipe from
【0008】 [0008]
請求項2の発明では、底部周壁に流体を導く配管を接続する孔を有しかつ周壁に底面から垂直方向に等間隔に開口した複数の小孔を有する升と、升の上方に升内の液面高さを測定するため液面と対向させて配設した超音波距離計とから形成したことを特徴とするドレン流量測定用の流量計である。 In the invention of claim 2, from the bottom to have and the peripheral wall of the hole for connecting the pipe for guiding the fluid to the bottom wall and boxes having a plurality of small holes opened at equal intervals in the vertical direction, above the boxes of Masunai a flow meter for drain flow measurement, characterized in that the liquid level is the liquid surface opposed to measure the height formed from an ultrasonic distance meter arranged.
【0009】 [0009]
すなわち、本発明のドレン流量の測定は、流体の圧力や圧力差などを直接的に利用することなく測定できるようにするもので、升に垂直方向に等間隔の複数個の小孔を開けておき、それぞれの小孔から流出する流体を合計することにより予め液面の高さの変化量と升から流出する流量との関係を求めておき、例えばメインの油圧システムのドレンの流体を、この油圧システムのドレンのオンラインから外した迂回ラインの配管に通して一時的に升の底部から升の中に注入し、注入した升内の流体の液面高さを液面上部に備えた超音波距離計からの距離により算出して油圧システムのドレン流量を測定する方法およびその装置である。 That is, measurement of the drain flow of the present invention is intended to be able to measure without directly using, for example pressure or pressure difference of the fluid, in a direction perpendicular to the boxes opened evenly spaced plurality of small holes Place each to previously obtain the relationship of the flow rate and flowing out from the height change amount and squares in advance the liquid level by summing the fluid flowing out of the small holes, for example, a fluid drain the main hydraulic system, the temporarily injected from the bottom of the boxes into the squares through piping bypass line was disconnected from line drain of the hydraulic system, the liquid level of the fluid injected in the boxes were equipped in liquid level upper ultrasonic is calculated by the distance from the distance meter is a method and apparatus for measuring the drainage rate of the hydraulic system.
【0010】 [0010]
この測定方法は、ベルヌーイの定理を活用するもので、図2に示すように、ドレンの流体を一時的に断面積Aの升4の中に注入して溜め、升4の周壁に設けた小孔nから流体を流出させる。 Small This measuring method is to utilize Bernoulli's principle, as shown in FIG. 2, reservoir and injected into the boxes 4 temporarily cross-sectional area A fluid drain, which is provided in the peripheral wall of the boxes 4 to flow out the fluid from the hole n. その流出流量qは、ベルヌーイの定理から数式1で表される。 Its outflow rate q can be expressed by Equation 1 from Bernoulli's theorem.
【0011】 [0011]
【数1】 [Number 1]
q=CA(2gh) 1/2 q = CA (2gh) 1/2
ただし、C:流体の流量係数、A:升の断面積、g:重力の加速度、h:小孔nの中心から液面までの距離である。 However, C: flow coefficient of the fluid, A: cross sectional area of ​​the squares, g: gravitational acceleration, h: the distance from the center of the small hole n to the liquid surface.
【0012】 [0012]
この場合、例えば、50リットル程度の流量を測定するために、小孔nを複数個、升4の周辺に底部から上方向に垂直に等間隔に開口する。 In this case, for example, to measure the flow rate of about 50 liters to open the small hole n plurality, at regular intervals perpendicularly upward from the bottom around the boxes 4. それぞれの小孔nから流出する流量を合計したものがそのときの液面高さの流体の流量qとなる。 The sum of the flow rate flowing out from the respective small holes n is the flow rate q of liquid level of the fluid at that time.
【0013】 [0013]
図3に示すように、液面6が、孔n2の直下と孔n1間にある時の流量は孔n1の流量q1を測定して求め、孔n3の直下と孔n2間にある時の流量は孔n1と孔n2の流量の合計のq1+q2を測定して求め、以下同様に孔n4と孔n3間にある時はq1+q2+q3の流量を測定して求め、このようにして最上部の孔より上に液面がある時の流量を予め測定して求めておく。 As shown in FIG. 3, a flow rate of the liquid surface 6, the flow rate when in between directly below the hole n1 hole n2 is determined by measuring the flow rate q1 of holes n1, located between immediately below the hole n2 hole n3 above is determined by measuring the sum of q1 + q2 flow holes n1 and holes n2, hereinafter similarly when in between holes n4 and holes n3 is determined by measuring the flow rate of q1 + q2 + q3, the top of the hole in this way previously obtained by previously measuring the flow rate when there is a liquid level. そしてその測定値を基に液面6の高さZと流量qの関係を求めておく。 The previously obtained relation height Z and flow rate q of the liquid level 6 based on the measured value.
【0014】 [0014]
一方、図4に示すように、升4内の流体の液面6に対向して升4の上方に超音波距離計5を配設し、升4の底面7と超音波距離計5との距離Z0を測定しておく。 On the other hand, as shown in FIG. 4, to face the liquid surface 6 of the fluid in the squares 4 disposed an ultrasonic distance meter 5 above the boxes 4, the bottom surface 7 of the squares 4 with ultrasonic distance meter 5 the distance Z0 is measured in advance. 次に、液面6を超音波距離計5で測定し、超音波距離計5と液面6までの距離Z1を求める。 Then, the liquid level 6 is measured by the ultrasonic distance meter 5, determine the distance Z1 to the ultrasonic distance meter 5 and the liquid level 6. Z0−Z1=Z2が、底面7からの液面6の高さZである。 Z0-Z1 = Z2 is the height Z of the liquid level 6 from the bottom surface 7. よって液面6の高さZを超音波距離計5で間接的に測定することができ、この時の液面高さZを、上記で求めた流体の液面6の高さZと小孔nから流出する流量qの関係に適用することで、この時の流量qが測定できる。 Thus the height Z of the liquid level 6 can be indirectly measured by the ultrasonic distance meter 5, the liquid level Z at this time, the height Z and pores of the liquid surface 6 of the fluid obtained above by applying the relationship of the flow rate q flowing from n, the flow rate q at this time can be measured.
【0015】 [0015]
【発明の実施の形態】 DETAILED DESCRIPTION OF THE INVENTION
以下、本発明の各実施の形態を図面を用いて説明する。 Below, an explanation will be given of embodiments of the present invention with reference to the drawings. 本実施の形態の例のドレン流量計は、先ず、図5に示すように、直径200mm、高さ450mmの円筒状の升4を製作し、円筒状の升4の底部側面に開口した孔に油圧機器、例えば油圧シリンダー2の油圧ユニットのポンプ1のドレン流体の油をオンライン8のポンプ1から流す迂回ラインの配管9を設ける。 Drain flowmeter of the present embodiment, first, as shown in FIG. 5, the diameter 200 mm, to prepare a cylindrical squares 4 height 450 mm, in the opened hole in the bottom side of the cylindrical boxes 4 hydraulic equipment, for example, providing a pipe 9 of the bypass line passing the oil drain fluid pump 1 of the hydraulic unit of the hydraulic cylinders 2 from the pump 1 online 8. 次に、流体が流出する小孔nの径を8mmとし、30mmピッチで底面7から上方向に垂直に等間隔に10個の小孔nを升4の周壁に開口し、上記の迂回ラインの配管9を升4の底部側面に開口した孔に接続して流体を流入可能とする。 Then, the diameter of the stoma n that the fluid flows out and 8 mm, from the bottom 7 at 30mm pitch ten small holes n at regular intervals perpendicularly upward opening in the peripheral wall of the boxes 4, the bypass line the pipe 9 connected to the hole opened in the bottom side of the boxes 4, can flow a fluid. さらに、この升4の上方に超音波距離計5を設け、これらの升4と超音波距離計5とにより本発明の流量計10とする。 Furthermore, the above squares 4 provided an ultrasonic distance meter 5, the flow meter 10 of the present invention these squares 4 and ultrasonic distance meter 5. 一方、升4に設けた小孔nから流出する流体の流量を測定するドレン流量計3を迂回ラインの配管7に設ける。 On the other hand, providing the drain flow meter 3 for measuring the flow rate of the fluid flowing out from the small holes n provided in boxes 4 to the pipe 7 of the bypass line. このように準備すると。 If you prepare in this way. メインシステムの油圧ユニットのオンライン8から迂回する配管9に流入する流体を升4に注入し、液面6が小孔n1、小孔n2、〜小孔n10に来た時のそれぞれの流出する合計流量をドレン流量計3の例えばメスシリンダーで量る。 The fluid flowing into the pipe 9 to bypass the line 8 of the hydraulic unit of the main system and injected into boxes 4, each of the outflow sum of when the liquid level 6 small holes n1, small holes n2, came to ~ stoma n10 the flow rate weigh in the drain flow meter 3, for example, a graduated cylinder. 小孔の径が8mm、ピッチ30mmの時、孔から流出する合計量は、流量q1=2.2リットル、q1+q2=5.3リットル、‥‥、q1+q2+〜+q5=18.5リットル、q1+q2+〜+q6=23.9リットル、q1+q2+〜+q7=29.8リットル、q1+q2+〜+q8=36.1リットル、q1+q2+〜+q9=42.8リットル、q1+q2+〜+q10=49.8リットルであった。 When the diameter of the small holes 8 mm, pitch 30 mm, the total amount flowing out of the holes, the flow rate q1 = 2.2 liters, q1 + q2 = 5.3 liters, ‥‥, q1 + q2 + ~ + q5 = 18.5 liters, q1 + q2 + ~ + q6 = 23.9 liters, was q1 + q2 + ~ + q7 = 29.8 Rittoru, q1 + q2 + ~ + q8 = 36.1 Rittoru, q1 + q2 + ~ + q9 = 42.8 Rittoru, q1 + q2 + ~ + q10 = 49.8 liters.
【0016】 [0016]
この流量qの測定値から液面の高さZと流体が流出する流量Qの関係の近似式である数式2を求めた。 From this measurement of flow rate q of the liquid surface height Z fluid was determined Equation 2 is an approximate expression of the relationship of the flow rate Q flowing out.
【0017】 [0017]
【数2】 [Number 2]
流量Q=0.0204×(Z 1.3627 Flow rate Q = 0.0204 × (Z 1.3627)
ただし、Q:流量、Z:液面の高さである。 However, Q: flow rate, Z: is the height of the liquid surface.
【0018】 [0018]
そして、円筒の升4の上部に液面6に垂直に対向させて液面6を測定するため上記で設けた超音波距離計5を升4の最上部の小孔n10より200mmの上部に位置するものとする。 The position at the top of 200mm from the small holes n10 of the top of the ultrasonic distance meter 5 provided above for with vertically to face the liquid level 6 on top of the boxes 4 of the cylinder to measure the liquid level 6 squares 4 It shall be. この超音波距離計5を用いて油圧シリンダー2を有する油圧ユニットのポンプ1のドレン量の測定を行った。 It was measured drain of the pump 1 of the hydraulic unit having a hydraulic cylinder 2 with the ultrasonic distance meter 5. この結果を表1に示す。 The results are shown in Table 1.
【0019】 [0019]
【表1】 [Table 1]
【0020】 [0020]
以上のことから流体の液面高さZとドレン量Qの関係がわかり、ドレン流量Qが毎分リットル単位の精度で測定できることがわかった。 Understand the relationship between the liquid level Z and the drain quantity Q of fluid from the above, the drain flow rate Q was found to be measured with an accuracy of liters per minute units.
【0021】 [0021]
【発明の効果】 【Effect of the invention】
以上に説明したように、本発明は流体の差圧がほとんど0の状態または配管中が流体で満たされていない状態でも、測定する流体をその流体機器のオンラインから外して迂回ラインに設けた升の中に一時的に注入し、その升内の流体の液面の高さを升の上方に設けた超音波距離計により測定することによってその升に設けた小孔から流出する流体の流量を、求めることができ、しかもその流量が数リットル毎分の精度で測定することができる。 As described above, squares invention in conditions or piping most differential pressure of the fluid is zero is also in a state that is not filled with fluid, having a fluid to be measured in the bypass line off the line of the fluid device temporarily injected into the flow rate of fluid flowing to the liquid level of the fluid in the squares from the small hole provided in the boxes by measuring the ultrasonic distance meter arranged above the boxes , it can be obtained, yet it is possible that the flow rate is measured at several liters per minute of accuracy.
【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS
【図1】本発明のドレン流量計を設けた油圧システムを示す図である。 1 is a diagram showing a hydraulic system in which a drain flow meter of the present invention.
【図2】本発明のドレン流量計の原理を示す図である。 2 is a diagram showing the principle of drain flow meter of the present invention.
【図3】本発明のドレン流量計に使用する升を示す図である。 3 is a diagram showing the boxes to be used to drain flow meter of the present invention.
【図4】超音波距離計と液面との関係を示す図である。 4 is a diagram showing the relationship between the ultrasonic distance meter and the liquid level.
【図5】本発明のドレン流量計の概略を示す図である。 5 is a diagram showing an outline of a drain flow meter of the present invention.
【符号の説明】 DESCRIPTION OF SYMBOLS
1 ポンプ2 油圧シリンダー3 ドレン流量計4 升5 超音波距離計6 液面7 底面8 オンライン9 配管9 1 pump 2 hydraulic cylinder 3 drain flow meter 4 squares 5 ultrasonic rangefinder 6 liquid level 7 bottom 8 Online 9 pipe 9
n 小孔 n small holes

Claims (2)

  1. 垂直方向に等間隔の複数個の小孔を開けた升を用意し、升内の流体の液面高さを液面上部に備えた超音波距離計からの距離から算出し、一方、予めそれぞれの小孔から流出する流体を合計した流量と液面高さとの関係を求めておき、流体装置のメインシステムの流体のオンラインの流体送給用のポンプのドレンからオンラインを外した迂回ラインの配管を配設し、該配管を升の底部周壁に等間隔で垂直方向の多数の小孔を有する升の底部側壁に接続して升の中に流体を注入、升の小孔から流体を迂回ラインの配管に流出して戻しながら升内の流体の液面高さを超音波距離計により測定し、該測定値から配管を流れる流量を知ることを特徴とするドレン流量の測定方法。 Prepared squares opened the equally spaced plurality of small holes in the vertical direction, is calculated from the distance from the ultrasonic distance meter equipped with a liquid level of the fluid in the squares in the liquid level upper, whereas, previously, respectively of to previously obtain a relation between the flow rate and the liquid level height which is the sum of the fluid flowing out of the small hole, the bypass line disconnecting the line from the drain pump for feeding fluid line of the fluid in the main system of the fluid system piping It was disposed, injecting fluid tubing connected to a number of bottom side wall of the squares with a small hole in the vertical direction at equal intervals on the bottom wall of the squares in the boxes, bypassing the fluid from the small holes in the boxes line while back flows in piping liquid level of the fluid in the mass was measured by ultrasonic distance meter, measuring method of drain flow, characterized in that to know the flow through the pipe from the measured value.
  2. 底部周壁に流体を導く配管を接続する孔を有しかつ周壁に底面から垂直方向に等間隔に開口した複数の小孔を有する升と、升の上方に升内の液面高さを測定するため液面と対向させて配設した超音波距離計とから形成したことを特徴とするドレン流量測定用の流量計。 Measuring the boxes having a plurality of small holes opened at equal intervals in the vertical direction a pipe conducting fluid to the bottom wall from the bottom surface has a hole and a peripheral wall that connects the liquid level of the Masunai above the boxes flowmeter for drain flow measurement, characterized in that by the liquid surface facing formed from an ultrasonic rangefinder arranged for.
JP2003024808A 2003-01-31 2003-01-31 Method for measuring drain flow rate and its flowmeter Pending JP2004233293A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007007902A (en) * 2005-06-28 2007-01-18 Fujifilm Holdings Corp Ink tank and inkjet recorder
JP2007050565A (en) * 2005-08-16 2007-03-01 Fujifilm Corp Ink supply apparatus, inkjet recording device, and ink cartridge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007007902A (en) * 2005-06-28 2007-01-18 Fujifilm Holdings Corp Ink tank and inkjet recorder
JP2007050565A (en) * 2005-08-16 2007-03-01 Fujifilm Corp Ink supply apparatus, inkjet recording device, and ink cartridge

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