JP4765463B2 - Flow measuring device - Google Patents

Flow measuring device Download PDF

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JP4765463B2
JP4765463B2 JP2005219968A JP2005219968A JP4765463B2 JP 4765463 B2 JP4765463 B2 JP 4765463B2 JP 2005219968 A JP2005219968 A JP 2005219968A JP 2005219968 A JP2005219968 A JP 2005219968A JP 4765463 B2 JP4765463 B2 JP 4765463B2
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行夫 長岡
裕治 中林
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Panasonic Corp
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Description

本発明は、液体や気体などの流量を計測する流量計測装置に関するものである。   The present invention relates to a flow rate measuring device for measuring a flow rate of liquid or gas.

従来この種の流量計測装置は、図４に示すように超音波流量検出手段５１により検出した流量値が脈動しているか否かを判別する脈動判別手段５２と、この脈動判別手段５２の測定結果によって異なった手段を用いて流量値を算出する流量演算手段を備えており、超音波流量検出手段５１によって計測された瞬時流量Ｑ（ｉ）と前回に測定された瞬時流量Ｑ（ｉ−１）との差を取り、その差が所定値以上の場合、脈動判別手段５２は脈動ありと判別する。そして脈動ありの場合にはフィルタ処理手段５３を介して安定流量算出手段５４で流量を算出する（例えば特許文献１参照）。
特開２０００−２９８０４２号公報 Conventionally, as shown in FIG. 4, this type of flow rate measuring apparatus includes a pulsation determining unit 52 for determining whether or not the flow rate value detected by the ultrasonic flow rate detecting unit 51 is pulsating, and a measurement result of the pulsation determining unit 52. The flow rate calculation means for calculating the flow rate value by using different means depending on the instantaneous flow rate Q (i) measured by the ultrasonic flow rate detection means 51 and the instantaneous flow rate Q (i-1) measured last time. When the difference is equal to or greater than a predetermined value, the pulsation determining means 52 determines that there is pulsation. When there is pulsation, the flow rate is calculated by the stable flow rate calculation unit 54 via the filter processing unit 53 (see, for example, Patent Document 1).
JP 2000-298042 A

しかしながら、前記従来の構成では、瞬時流量の差のみで脈動の有無を判定していたので、回路ノイズなどによる流量検出誤差でも脈動と判定してしまう場合があり、ガスエンジンのような検出すべき脈動以外のときでも、誤って脈動と判定してしまうことがあった。   However, in the above-described conventional configuration, since the presence or absence of pulsation is determined only by the difference in instantaneous flow rate, a flow rate detection error due to circuit noise or the like may be determined as pulsation. Even when it is not pulsation, it may be erroneously determined as pulsation.

本発明は、前記従来の課題を解決するもので、脈動時と安定時とを正確に判定する流量計測装置を提供することを目的とする。   The present invention solves the above-described conventional problems, and an object of the present invention is to provide a flow rate measuring device that accurately determines when pulsation and when stable.

前記従来の課題を解決するために、本発明の流量計測装置は、流体の流量を計測する流量計測手段と、前記流量計測手段の流量値の変動状態を検出する流量変動判定手段と、前記流量計測手段で使用した流量値を平均した値で流量の安定状態を判定する流量安定判定手段と、前記流量変動判定手段もしくは前記流量安定判定手段によって前記流量計測手段の計測時間または計測回数を変更する計測モード変更手段とを備えたものである。   In order to solve the above-described conventional problems, a flow rate measuring device according to the present invention includes a flow rate measuring unit that measures a flow rate of a fluid, a flow rate fluctuation determining unit that detects a fluctuation state of a flow rate value of the flow rate measuring unit, and the flow rate The flow rate stability determination means for determining the stable state of the flow rate by the average value of the flow rate values used in the measurement means, and the measurement time or the number of times of measurement of the flow rate measurement means is changed by the flow rate fluctuation determination means or the flow rate stability determination means. Measurement mode changing means.

これによって、変動の判定は流量の瞬時値で行い、安定の判別は平均流量に基づいて行う。   As a result, the variation is determined based on the instantaneous value of the flow rate, and the stability is determined based on the average flow rate.

本発明の流量計測装置は、流量の変動時には流量の瞬時値で判定を行い、流量の安定の判別は平均流量で判定するので、脈動時にはすばやく判定し、安定時には正確に判定し、不必要に計測回数を増加させることなく流量精度を確保できるので、低消費電力で計測を行うことができる。   The flow rate measuring device of the present invention makes a determination based on the instantaneous value of the flow rate when the flow rate fluctuates, and determines whether the flow rate is stable based on the average flow rate. Since flow rate accuracy can be ensured without increasing the number of measurements, measurement can be performed with low power consumption.

本発明の流量計測装置は、流体の流量を計測する流量計測手段と、前記流量計測手段の流量値の変動状態を検出する流量変動判定手段と、前記流量計測手段で使用した流量値を平均した値で流量の安定状態を判定する流量安定判定手段と、前記流量変動判定手段もしくは前記流量安定判定手段によって前記流量計測手段の計測時間または計測回数を変更する計測モード変更手段とを備えたもので、流量の瞬時値の変化度合いで流量変動を判定し、流量の平均値の変化度合いで流量安定度を判定するので、脈動時と安定時とを正確に判定できる。   The flow rate measuring device according to the present invention averages the flow rate values used by the flow rate measuring means for measuring the flow rate of the fluid, the flow rate fluctuation determining means for detecting the fluctuation state of the flow rate value of the flow rate measuring means, and the flow rate measuring means. A flow rate stability determining means for determining a stable state of the flow rate by value, and a measurement mode changing means for changing the measurement time or the number of times of measurement of the flow rate measuring means by the flow rate fluctuation determining means or the flow rate stability determining means. Since the flow rate variation is determined based on the change rate of the instantaneous value of the flow rate, and the flow rate stability is determined based on the change rate of the average value of the flow rate, it is possible to accurately determine the pulsation time and the stable time.

流量変動判定手段は、計測値が前回計測値より変動設定流量以上大きい増加変動回数と、計測値が前回計測値より小さい減少変動回数との両方から判定するか、所定計測回数のうちで変動設定流量値以上の変化を所定回数以上検出したとき変動ありと判定する。 The flow rate variation determination means determines whether the measured value is determined based on both the number of increased fluctuations that are larger than the previous measured value by the fluctuation setting flow rate and the number of decreased fluctuations that are smaller than the previous measured value. When a change greater than the flow rate value is detected a predetermined number of times, it is determined that there is a change.

そして、流量変動値を流量値の差分もしくは流量値の差分に対する流量値の割合で判定する。   Then, the flow rate fluctuation value is determined by the flow rate value difference or the ratio of the flow rate value to the flow rate difference.

また、流量変動判定手段は、変動設定流量値以上の変化を検出したとき変動ありと判定し計測回数または計測時間を大きくするか、或いは、安定設定流量値以下の流量値を連続して検出したとき安定と判定し、計測回数または計測時間を小さくする。   In addition, the flow rate variation determination means determines that there is variation when detecting a change greater than or equal to the variation set flow rate value, increases the number of measurements or measurement time, or continuously detects a flow rate value less than or equal to the stable set flow rate value. When it is determined to be stable, the number of measurements or measurement time is reduced.

一方、流量計測手段は、流体管路の上流と下流に設けられ音波信号を発信受信する送受信器と、前記送受信器間の超音波伝搬時間差の値に基づいて流量を算出する流量演算手段とを備えたものである。   On the other hand, the flow rate measuring means includes a transmitter / receiver that is provided upstream and downstream of the fluid conduit and transmits / receives a sound wave signal, and a flow rate calculating means that calculates a flow rate based on a value of an ultrasonic propagation time difference between the transmitter / receiver. It is provided.

さらに、流体管路の上流と下流に設けられ超音波信号を発信受信する送受信器と、前記送受信器の発信受信の切換手段と、前記送受信器間の超音波伝搬時間差を計測する計時手段と、上流から下流への伝搬時間を測定後に下流から上流への伝搬時間を測定し伝搬時間差を算出する上流先行計測手段と、下流から上流への伝搬時間を測定後に上流から下流への伝搬時間を測定し伝搬時間差を算出する下流先行計測手段と、前記上流先行計測手段と前記下流先行計測手段のそれぞれから流量を算出する流量演算手段と、前記上流先行計測手段と前記下流先行計測手段の平均値から流量を算出する平均流量演算手段と、前記流量計測手段の流量値の変動状態を検出する流量変動判定手段と、前記平均流量演算手段の流量値で流量の安定状態を判定する流量安定判定手段と、前記流量変動判定手段もしくは前記流量安定判定手段によって前記流量計測手段の計測時間または計測回数を変更する計測モード変更手段とを備えた。   Furthermore, a transmitter / receiver that is provided upstream and downstream of the fluid conduit and transmits / receives an ultrasonic signal, a transmission / reception switching unit of the transmitter / receiver, a time measuring unit that measures a difference in ultrasonic propagation time between the transmitter / receiver, An upstream leading measurement means that measures the propagation time from downstream to upstream after measuring the propagation time from upstream to downstream, and calculates the propagation time difference, and measures the propagation time from upstream to downstream after measuring the propagation time from downstream to upstream From the downstream preceding measuring means for calculating the propagation time difference, the flow rate calculating means for calculating the flow rate from each of the upstream preceding measuring means and the downstream preceding measuring means, and the average value of the upstream preceding measuring means and the downstream preceding measuring means An average flow rate calculation means for calculating a flow rate, a flow rate fluctuation determination means for detecting a fluctuation state of the flow rate value of the flow rate measurement means, and a stable flow rate state are determined by the flow rate value of the average flow rate calculation means. And flow stability determining means, and a measurement mode changing means for changing the measurement time or the number of times of measuring the flow rate measuring means by the flow change determination means or the flow stability judgment means.

流量計測装置は計測モード変更手段の値によって流量の積算方法を変更する流量積算手段を備えた。   The flow rate measuring device includes flow rate integration means for changing the flow rate integration method according to the value of the measurement mode change means.

（実施の形態１）
図１において、１は流体を通過させる流路であり、熱式のフローセンサのような流速を電気信号に変換する流量センサ２を有し、その流量センサ２の信号を信号処理手段３で増幅・比較あるいは演算処理をおこない、その信号に基づいて流路の通過面積などを考慮して流量演算手段４で流量を算出する。 (Embodiment 1)
In FIG. 1, reference numeral 1 denotes a flow path through which a fluid passes, and has a flow rate sensor 2 that converts a flow rate into an electrical signal, such as a thermal flow sensor, and a signal processing means 3 amplifies the signal of the flow rate sensor 2. Comparison or calculation processing is performed, and the flow rate calculation means 4 calculates the flow rate in consideration of the passage area of the flow path based on the signal.

この流量演算手段４の値は流量変動判定手段５でその変化の度合いを演算し、さらに流量演算手段４の値は流量平均化手段６において平均値を演算し、その平均値の値によって流量安定判定手段７でその安定度合いを演算する。   The flow rate calculation means 4 calculates the degree of change in the flow rate fluctuation determination means 5, and the flow rate calculation means 4 calculates the average value in the flow rate averaging means 6, and the flow rate is stabilized by the average value. The determination means 7 calculates the degree of stability.

流量変動判定手段５と流量安定判定手段７の判定によって、流れが脈動であるか安定しているかを判定し、計測モード変更手段８で流量計測の計測回数変更手段９と計測時間変更手段１０とを変更する。   It is determined whether the flow is pulsating or stable based on the determination of the flow rate fluctuation determination unit 5 and the flow rate stability determination unit 7, and the measurement mode changing unit 8 uses the measurement number changing unit 9 and the measurement time changing unit 10. To change.

計測回数変更手段９は、所定時間の間に何回繰り返して計測するかを設定するもので、また、１回の計測で何秒間計測するかを設定するものである。この設定に基づいて流量開始手段１１で計測を開始する。   The measurement number changing unit 9 sets how many times the measurement is repeated during a predetermined time, and sets how many seconds are measured in one measurement. Based on this setting, the flow rate start means 11 starts measurement.

流量センサ２と、信号処理手段３と流量演算手段４と計測開始手段１１とで流量計測手
段１２を形成する。 The flow rate measuring means 12 is formed by the flow rate sensor 2, the signal processing means 3, the flow rate calculating means 4, and the measurement starting means 11.

１３は累積の体積を算出する流量積算手段で、計測モードによって積算の方法をかえるもので、脈動が小さい場合には直ちに積算を行うが、脈動が激しい場合にはバッファ１３ａを介して平均化した値を積算するようにする。   13 is a flow rate integration means for calculating the accumulated volume, and the integration method is changed depending on the measurement mode. When the pulsation is small, the integration is performed immediately, but when the pulsation is intense, it is averaged through the buffer 13a. Try to integrate the values.

次に図２において流量変動判定手段５と流量安定判定手段７の動作をフローチャートで説明する。   Next, the operations of the flow rate fluctuation determination unit 5 and the flow rate stability determination unit 7 will be described with reference to FIG.

ＳＴＥＰ１からは流量変動判定の動作を示すフローであり、流量変動判定は判定回数Ｍｓのうちで、前回値との流量差が増加減少それぞれＱｓ以上の回数がＺｓ回・Ｇｓ回以上だったときに変動ありと判定する。   STEP 1 is a flow showing the flow rate variation determination operation. The flow rate variation determination is performed when the flow rate difference from the previous value is increased or decreased among the determination times Ms, and the number of times Qs or more is Zs times or Gs times or more, respectively. Judge that there is fluctuation.

まず、ＳＴＥＰ２で、判定回数Ｍ・増加回数Ｚ・減少回数Ｇを０にし、ＳＴＥＰ３で流量計測を行う。このとき計測回数変更手段９で計測回数が少ない状態での計測（以下安定計測モードという）からスタートし、そのときの流量値Ｑｉを得る。   First, in STEP2, the determination number M, the increase number Z, and the decrease number G are set to 0, and the flow rate is measured in STEP3. At this time, the measurement number changing means 9 starts from measurement in a state where the number of measurement is small (hereinafter referred to as a stable measurement mode), and obtains a flow rate value Qi at that time.

ＳＴＥＰ４で判定回数を１増加させ、ＳＴＥＰ５で前回計測値との差を算出し、その差が増加判定流量Ｑｓ以上かどうかを判定し、以上であればＳＴＥＰ６で増加回数Ｚを１増加させ、未満であれば減少判定流量−Ｑｓ以下であるかどうかをＳＴＥＰ７で判定し、以下であればＳＴＥＰ８で減少回数Ｇを１増加させる。   In STEP 4, the number of determinations is incremented by 1, and in STEP 5, the difference from the previous measurement value is calculated. It is determined whether or not the difference is greater than or equal to the increase determination flow rate Qs. If so, it is determined in STEP 7 whether or not it is equal to or less than the reduction determination flow rate −Qs, and if it is below, the decrease count G is increased by 1 in STEP 8.

ＳＴＥＰ９では増加回数Ｚが増加設定回数Ｚｓ以上でかつ減少回数Ｇが減少設定回数Ｇｓ以上であれば、流量の変化が激しいと判断し、ＳＴＥＰ１０で計測モード変更手段１１で流量計測回数を増加または計測時間を増加させる計測モード（以下脈動計測モードという）に変更する。   In STEP 9, if the increase count Z is equal to or greater than the increase set count Zs and the decrease count G is equal to or greater than the decrease set count Gs, it is determined that the flow rate changes drastically. In STEP 10, the measurement mode changing means 11 increases or measures the flow rate count. Change to a measurement mode that increases the time (hereinafter referred to as pulsation measurement mode).

ＳＴＥＰ９で増加回数Ｚが増加設定回数Ｚｓに達しないか、あるいは減少回数Ｇが減少回数Ｇｓに達しない場合には、ＳＴＥＰ１１で判定回数Ｍが設定判定回数Ｍｓに達しない場合には、ＳＴＥＰ３の計測回数小の流量計測に戻り、設定判定回数Ｚｓに達っした場合にはＳＴＥＰ２に帰り、初期値をゼロにして繰り返す。   If the increase count Z does not reach the increase set count Zs in STEP 9 or the decrease count G does not reach the decrease count Gs, if the determination count M does not reach the set determination count Ms in STEP 11, the measurement in STEP 3 is performed. Returning to the flow rate measurement with a small number of times, when the set determination number of times Zs is reached, the process returns to STEP 2 and is repeated with the initial value set to zero.

ＳＴＥＰ１２は脈動計測モードのフローを示し、この脈動計測モードでは計測時間または計測回数を増加させて脈動時の流量を正確に計測するものであるが、反面消費電力が増加するので、脈動が小さくなった場合には速やかに安定計測モードへ復帰することが望ましい。   STEP12 shows the flow of the pulsation measurement mode. In this pulsation measurement mode, the measurement time or the number of measurements is increased to accurately measure the flow rate at the time of pulsation. However, since the power consumption increases, the pulsation decreases. In such a case, it is desirable to quickly return to the stable measurement mode.

脈動モードでは、流量の安定度を前回流量値との差で判定し、この差が安定設定値Ｑｋ以内で連続して安定設定回数Ｋａ継続したとき脈動が小さくなったとして、安定計測モードへ移行する。   In the pulsation mode, the stability of the flow rate is determined from the difference from the previous flow rate value, and when this difference continues continuously within the stable setting value Qk and the number of stable setting times Ka continues, it is assumed that the pulsation has decreased, and the transition to the stable measurement mode is made. To do.

ＳＴＥＰ１３で安定回数を初期化し、ＳＴＥＰ１４で計測回数または計測時間が大きくした計測を行いその流量値をＱｉとすると、ＳＴＥＰ１５で前回の流量値と今回の流量値との流量平均値を算出し、ＳＴＥＰ１６で算出した前回の流量平均値と今回の流量平均値との差ｄＱｊを算出し、ＳＴＥＰ１７で流量平均値の差ｄＱｊと安定設定値Ｑｋとを比較し流量平均値の差が小さければＳＴＥＰ１８で安定回数Ａを１増加させ、流量平均値の差が大きければＳＴＥＰ１３の初期値へ戻る。   In STEP13, the number of stable times is initialized, and in STEP14, the number of times of measurement or the measurement time is increased. If the flow rate value is Qi, the flow rate average value of the previous flow rate value and the current flow rate value is calculated in STEP15. The difference dQj between the previous flow rate average value calculated in step 4 and the current flow rate average value is calculated. In step 17, the flow rate average value difference dQj is compared with the stable set value Qk. The number of times A is increased by 1, and if the difference between the average flow values is large, the initial value of STEP 13 is restored.

安定回数Ａが増加してＳＴＥＰ１９で安定設定回数Ｋａに達したとき、ＳＴＥＰ２０で計測回数あるいは計測時間の小さい安定計測モードへ移行する。   When the stable count A increases and reaches the stable set count Ka in STEP 19, the process proceeds to a stable measurement mode with a small measurement count or measurement time in STEP 20.

ＳＴＥＰ５の増加判定流量ＱｓとＳＴＥＰ７の減少判定流量Ｑｓとは実施例では同一の流量値としたが、必ずしも同一である必要はなく、また増加設定回数Ｚｓと減少設定回数Ｇｓとは同一回数である必要はなく、場合によってはどちらか一方の回数で判定しても良い。   The increase determination flow rate Qs in STEP 5 and the decrease determination flow rate Qs in STEP 7 are set to the same flow rate value in the embodiment, but are not necessarily the same, and the increase set number Zs and the decrease set number Gs are the same number. It is not necessary, and depending on the case, it may be determined by either one of the numbers.

ＳＴＥＰ５と７の判定流量を、流量値そのものではなく流量値に対する変化値の割合で判定することもでき、小流量のときは流量値で設定し、大流量では変化割合で判断することも考えられる。   The determination flow rate of STEP 5 and 7 can be determined not by the flow rate value itself but by the ratio of the change value to the flow rate value. When the flow rate is small, the flow rate value is set. .

さらに、ＳＴＥＰ１５の流量平均値は、３回以上の移動平均で設定することもでき、流量変化ｄＱｊと安定設定値Ｑｋを流量値ではなく、流量値に対する割合で判定することも可能である。   Furthermore, the flow rate average value of STEP 15 can be set by a moving average of three or more times, and the flow rate change dQj and the stable set value Qk can be determined not by the flow rate value but by the ratio to the flow rate value.

（実施の形態２）
図３において、２１は流体を通過させる流路であり、その上流側と下流側に送受信器２２Ａと２２Ｂをそれぞれ配置し、送信手段２３から切換手段２４を介して送受信器２２Ａを駆動して音波信号を発生させ、送受信器２２Ｂからの信号を受信し、また送受信方法を切り換えて送受信器２２Ｂから２２Ａに向けて送信し、これを繰り返し手段２５を介して所定回数繰り返し、その後、増幅比較手段２６を介して計時手段２７で伝搬時間を計測し、この音波信号の伝搬時間の差と流路形状から流量演算手段２８で演算することにより流量を検出する。 (Embodiment 2)
In FIG. 3, reference numeral 21 denotes a flow path for allowing fluid to pass through. Transmitters 22A and 22B are arranged on the upstream side and the downstream side, respectively, and the transmitter / receiver 22A is driven from the transmission unit 23 via the switching unit 24 to generate sound waves. A signal is generated, a signal is received from the transmitter / receiver 22B, a transmission / reception method is switched and transmitted from the transmitter / receiver 22B to 22A, and this is repeated a predetermined number of times via the repeating means 25, and then the amplification comparing means 26 Then, the time measuring means 27 measures the propagation time, and the flow rate calculating means 28 calculates the flow rate from the difference in propagation time of the sound wave signal and the flow path shape.

送受信器２２Ａ，２２Ｂと切換手段２４、増幅比較手段２６、計時手段２７、および流量演算手段２８で流量検出手段２９を構成する。   The transmitter / receiver 22A, 22B, the switching unit 24, the amplification comparing unit 26, the time measuring unit 27, and the flow rate calculating unit 28 constitute a flow rate detecting unit 29.

流量検出手段２９で求められた数秒ごとの流量値は図1と同様に、流量演算手段２８の値は流量変動判定手段５でその変化の度合いを演算し、さらに流量演算手段２８の値は流量平均化手段６において平均値を演算し、その平均値の値によって流量安定判定手段７でその安定度合いを演算し、計測モード変更手段８で計測方法を変更する。   The flow rate value obtained by the flow rate detecting means 29 every few seconds is the same as in FIG. 1, the flow rate calculating means 28 calculates the degree of change in the flow rate fluctuation determining means 5, and the flow rate calculating means 28 value is the flow rate. The averaging means 6 calculates an average value, the flow rate stability determining means 7 calculates the degree of stability based on the average value, and the measurement mode changing means 8 changes the measurement method.

３０は上流先行計測手段で、このモードに設定されるとまず切換手段２４上流側送受信器２２Ａから下流側送受信器２２Ｂへ送信するように切り換えて上流から下流への音波の伝搬時間を計時した後、切換手段２４で下流側送受信器２２Ｂから上流側送受信器２２Ａへ送信するように切り換えられ下流から上流への音波の伝搬時間を計時して流量を算出する。   Reference numeral 30 denotes upstream upstream measurement means. When this mode is set, the switching means 24 is first switched to transmit from the upstream side transceiver 22A to the downstream side transceiver 22B, and after measuring the propagation time of the sound wave from upstream to downstream. The switching means 24 switches the transmission / reception from the downstream transmitter / receiver 22B to the upstream transmitter / receiver 22A, and measures the propagation time of the sound wave from the downstream to the upstream to calculate the flow rate.

３１は下流先行計測手段で、このモードに設定されるとまず切換手段２４を下流側送受信器２２Ｂから上流側送受信器２２Ａへ送信するように切り換えて下流から上流への音波の伝搬時間を計時した後、切換手段２４で上流側送受信器２２Ａから下流側送受信器２２Ｂへ送信するように切り換えられ、上流から下流への音波の伝搬時間を計時して流量を算出する。   31 is a downstream advanced measuring means. When this mode is set, the switching means 24 is first switched to transmit from the downstream transmitter / receiver 22B to the upstream transmitter / receiver 22A, and the propagation time of the sound wave from downstream to upstream is measured. Thereafter, the switching means 24 switches so as to transmit from the upstream transceiver 22A to the downstream transceiver 22B, and measures the propagation time of the sound wave from upstream to downstream to calculate the flow rate.

これは間歇的に計測を行う際に回路部品が通電されることにより部品の温度が変化し、それにより遅延時間が異なって伝搬時間の計測に影響を与えるため、この２つの伝搬時間を平均することにより、回路の遅延時間が相殺され正確な伝搬時間すなわち正確な流量を計測できるものである。   This is because when the circuit component is intermittently measured, the temperature of the component changes due to the circuit component being energized, which affects the measurement of the propagation time due to different delay times, so the two propagation times are averaged. As a result, the delay time of the circuit is offset, and an accurate propagation time, that is, an accurate flow rate can be measured.

流量安定判定手段７は流量平均化手段６の値をもとに安定度を判定しており、上流先行計測手段３０と下流先行計測手段３１の計測の平均値すなわち正確な流量値から判定して
いる。流量変動判定手段５は、流量演算手段２８の値すなわち多少精度は低下するが応答性の高い瞬時流量をもとに判定している。 The flow rate stability determination unit 7 determines the stability based on the value of the flow rate averaging unit 6 and determines from the average value of the measurements of the upstream preceding measurement unit 30 and the downstream preceding measurement unit 31, that is, the accurate flow rate value. Yes. The flow rate variation determination means 5 makes the determination based on the value of the flow rate calculation means 28, that is, the instantaneous flow rate with high responsiveness, although the accuracy is somewhat lowered.

本発明の流速または流量計測装置は、圧力変動が発生したばあい直ちに判定ができ、また安定時にも正確に判定ができるので、ガスや水道などの計量メータや、産業用プラントや実験設備における流量計などの計測器にも適用できる。   The flow velocity or flow rate measuring device of the present invention can immediately determine when pressure fluctuations occur, and can also accurately determine when stable, so the flow rate in metering meters such as gas and water, industrial plants and experimental equipment It can also be applied to measuring instruments such as meters.

本発明の実施の形態１における流量計測装置のブロック図Block diagram of a flow rate measuring device in Embodiment 1 of the present invention 同実施の形態１における流量計測装置のフローチャートFlowchart of the flow rate measuring device in the first embodiment 本発明の実施の形態２における流量計測装置のブロック図Block diagram of a flow rate measuring device in Embodiment 2 of the present invention 従来の流量計測装置のブロック図Block diagram of a conventional flow measurement device

符号の説明Explanation of symbols

４，２８ 流量演算手段
５ 流量変動判定手段
７ 流量安定判定手段
８ 計測モード変更手段
１２ 流量計測手段
１３ 流量積算手段
２２Ａ，２２Ｂ 送受信器
２４ 切換手段
３０ 上流先行計測手段
３１ 下流先行計測手段 4, 28 Flow rate calculation means 5 Flow rate fluctuation determination means 7 Flow rate stability determination means 8 Measurement mode change means 12 Flow rate measurement means 13 Flow rate integration means 22A, 22B Transceiver 24 Switching means 30 Upstream preceding measurement means 31 Downstream preceding measurement means

Claims (9)

流体の流量を計測する流量計測手段と、
前記流量計測手段で計測した前回と今回の流量値の差が所定の条件を満たす場合、流量の変動ありと判定する流量変動判定手段と、
前記流量計測手段で計測した流量値から求めた前回の平均値と今回の平均値との差が所定値以下の場合に流量が安定したと判定する流量安定判定手段と、
前記流量変動判定手段により流量の変動ありと判定された場合と、前記流量安定判定手段によって流量が安定したと判定された場合とで前記流量計測手段の計測時間または計測回数を変更する計測モード変更手段とを備えた流量計測装置。 A flow rate measuring means for measuring the flow rate of the fluid;
Wherein when the difference between the flow rate previous and current flow rate value measured by the measuring means satisfies a predetermined condition, and flow change determination means for determining that there is variation in the flow rate,
And determining the flow rate stability determining means and the flow rate is stabilized when the difference between the average value and the average value of the current and the previous obtained from the flow value measured by the flow rate measuring means is below a predetermined value,
A measurement mode change that changes the measurement time or the number of times of measurement of the flow rate measurement unit when the flow rate variation determination unit determines that there is a flow rate variation and when the flow rate stability determination unit determines that the flow rate is stable. And a flow rate measuring device. 前記流量変動判定手段は、前記流量計測手段で計測された流量値の計測値が前回計測値より変動設定流量以上大きい増加変動回数と、計測値が前回計測値より変動設定流量以上小さい減少変動回数との両方から判定する請求項１記載の流量計測装置。 The flow change determination unit, said the increase variation time count measurement value is larger variations set flow more than the previous measured value of the flow rate flow rate value measured by the measuring means, reduces the variation time count measured value is less variation set flow more than the previous measurement value The flow rate measuring device according to claim 1, which is determined from both. 前記流量変動判定手段は、前記流量計測手段で所定計測回数計測された流量値のうちで変動設定流量値以上の変化を所定回数以上検出したとき流量の変動ありと判定する請求項２記載の流量計測装置。 The flow change determination means, the flow rate of the flow rate measuring means varies the flow rate at the time of detecting a change in or change the set flow rate value over a predetermined number of times among the predetermined number of measurements measured flow rate value is with judges claim 2, wherein Measuring device. 前記流量変動判定手段は、前記流量計測手段で計測した前回と今回の流量値の差分に対する流量値の割合で判定する請求項１記載の流量計測装置。 The flow rate measuring apparatus according to claim 1 , wherein the flow rate variation determining unit determines the flow rate value relative to the difference between the previous flow rate value and the current flow rate value measured by the flow rate measuring unit. 前記流量変動判定手段は、前記流量計測手段で計測された流量値の変動設定流量値以上の変化を検出したとき流量の変動ありと判定し計測回数または計測時間を大きくする請求項１または２記載の流量計測装置。 3. The flow rate variation determination unit determines that there is a flow rate variation and increases the number of times of measurement or the measurement time when detecting a change in the flow rate value measured by the flow rate measurement unit that is greater than or equal to a variation set flow rate value. Flow measurement device. 前記流量安定判定手段は、前記流量計測手段で安定設定流量値以下の流量値を連続して検出したとき流量が安定と判定し、計測回数または計測時間を小さくする請求項１記載の流量計測装置。 The flow rate measuring device according to claim 1, wherein the flow rate stability determining unit determines that the flow rate is stable when the flow rate measuring unit continuously detects a flow rate value equal to or lower than a stable set flow rate value, and reduces the number of times of measurement or the measurement time. . 前記流量計測手段は、流体管路の上流と下流に設けられ音波信号を発信受信する送受信器
と、前記送受信器間の超音波伝搬時間差の値に基づいて流量を算出する流量演算手段とを備えた請求項１記載の流量計測装置。 The flow rate measuring means includes a transmitter / receiver that is provided upstream and downstream of a fluid conduit and transmits / receives a sound wave signal, and a flow rate calculation means that calculates a flow rate based on a value of an ultrasonic propagation time difference between the transmitter / receiver. The flow rate measuring device according to claim 1. 流体管路の上流と下流に設けられ超音波信号を発信受信する送受信器と、
前記送受信器の発信受信の切換手段と、
前記送受信器間の超音波伝搬時間差を計測する計時手段と、
上流から下流への伝搬時間を測定後に下流から上流への伝搬時間を測定し伝搬時間差を算出する上流先行計測手段と、
下流から上流への伝搬時間を測定後に上流から下流への伝搬時間を測定し伝搬時間差を算出する下流先行計測手段と、
前記上流先行計測手段と前記下流先行計測手段のそれぞれから流量を算出する流量演算手段と、
前記上流先行計測手段と前記下流先行計測手段の平均値から流量を算出する平均流量演算手段と、
前記流量演算手段で算出した前回と今回の流量値の差が所定の条件を満たす場合、流量の変動ありと判定する流量変動判定手段と、
前記平均流量演算手段で算出した前回の平均値と今回の平均値との差が所定値以下の場合に流量が安定したと判定する流量安定判定手段と、
前記流量変動判定手段により流量の変動ありと判定された場合と、前記流量安定判定手段によって流量が安定したと判定された場合とで前記流量計測手段の計測時間または計測回数を変更する計測モード変更手段とを備えた流量計測装置。 A transmitter / receiver that transmits and receives ultrasonic signals provided upstream and downstream of the fluid conduit;
The transmission / reception switching means of the transceiver;
A time measuring means for measuring a difference in ultrasonic propagation time between the transmitter and the receiver;
Upstream upstream measurement means for measuring the propagation time from downstream to upstream after measuring the propagation time from upstream to downstream, and calculating the propagation time difference;
Downstream upstream measurement means for measuring the propagation time from the downstream to the upstream after measuring the propagation time from the downstream to the upstream and calculating the propagation time difference; and
A flow rate calculating means for calculating a flow rate from each of the upstream preceding measuring means and the downstream preceding measuring means;
An average flow rate calculation means for calculating a flow rate from an average value of the upstream preceding measurement means and the downstream preceding measurement means;
Wherein if the difference between the previous and current flow rate value calculated by flow rate calculation means satisfies a predetermined condition, and flow change determination means for determining that there is variation in the flow rate,
And determining the flow rate stability determining means and the flow rate is stabilized when the difference between the preceding average value and the average value of the current calculated by the average flow computing unit is equal to or less than a predetermined value,
A measurement mode change that changes the measurement time or the number of times of measurement of the flow rate measurement unit when the flow rate variation determination unit determines that there is a flow rate variation and when the flow rate stability determination unit determines that the flow rate is stable. And a flow rate measuring device. 計測モード変更手段の値によって流量の積算方法を変更する流量積算手段を備えた請求項１〜８いずれか１項記載の流量計測装置。 The flow rate measuring device according to claim 1, further comprising a flow rate integrating unit that changes a flow rate integrating method according to a value of the measurement mode changing unit.
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