JP2000097740A - Flowmeter with abnormality sensing function - Google Patents
Flowmeter with abnormality sensing functionInfo
- Publication number
- JP2000097740A JP2000097740A JP10266457A JP26645798A JP2000097740A JP 2000097740 A JP2000097740 A JP 2000097740A JP 10266457 A JP10266457 A JP 10266457A JP 26645798 A JP26645798 A JP 26645798A JP 2000097740 A JP2000097740 A JP 2000097740A
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- Prior art keywords
- sound
- pattern
- circuit
- flow meter
- flow rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、異常検知機能付き
流量計に関し、より詳細には、回転子構造部を有する流
量計において回転子の回転に伴い発生する音又は音声パ
ターンにより流量計の異常状態を検知する異常検知機能
付き流量計に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow meter having an abnormality detecting function, and more particularly, to a flow meter having a rotor structure, wherein the abnormality of the flow meter is detected by a sound or a sound pattern generated by rotation of the rotor. The present invention relates to a flow meter with an abnormality detection function for detecting a state.
【０００２】[0002]
【従来の技術】回転子構造部を有する流量計、例えば、
ケーシング内に収められた２個の楕円形回転子に歯が加
工され、互いに噛み合って回転する歯車とその軸受けか
らなるオーバルギヤ式容積流量計、あるいは計量室又は
パイプの流れの中に設置された羽根車とその軸受けから
なるタービン式流量計等において、歯車の歯や羽根車の
羽根の欠損、欠落あるいは軸受けの摩耗等の異常が生じ
ることがある。このような異常状態を検知するために、
タービン式流量計においては、羽根の数を検出するセン
サと回転数を検出するセンサの２つのセンサを設け、互
いに検出結果を監視しながら異常を検知する技術が知ら
れている。2. Description of the Related Art A flow meter having a rotor structure, for example,
The two oval rotors housed in the casing are machined with teeth and installed in an oval-gear volumetric flow meter consisting of gears and bearings rotating in mesh with each other, or in a measuring chamber or pipe flow. In a turbine type flow meter or the like including an impeller and its bearing, an abnormality such as a missing or missing tooth of a gear or a blade of the impeller or abrasion of a bearing may occur. In order to detect such an abnormal state,
2. Description of the Related Art In a turbine type flowmeter, there is known a technology in which a sensor for detecting the number of blades and a sensor for detecting a rotation speed are provided, and an abnormality is detected while monitoring detection results with each other.
【０００３】[0003]
【発明が解決しようとする課題】従来の技術によれば、
例えば、羽根１枚が全体として欠落した場合や軸受けが
相当に摩耗した場合等相当程度の異常状態にならないと
異常として検知することができず、誤差を伴う測定が継
続されたり、故障等の異常の発見が遅れるという問題点
があった。According to the prior art,
For example, if a single blade is missing as a whole or if the bearings are significantly worn out, it will not be possible to detect it as an abnormality unless it is in a fairly abnormal state. There was a problem that the discovery of was delayed.
【０００４】本発明は、上述の実情に鑑みてなされたも
ので、回転子構造部を有する流量計において、回転子の
回転に伴い発生する音又は音声パターンにより流量計の
僅かな異常状態を容易に検知することができる異常検知
機能付き流量計を提供するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a flow meter having a rotor structure, a slight abnormal state of the flow meter can be easily detected by a sound or a sound pattern generated by rotation of the rotor. It is intended to provide a flow meter with an abnormality detection function capable of detecting the flow rate at a time.
【０００５】[0005]
【課題を解決するための手段】請求項１の発明は、回転
子構造部を有する流量計において、前記回転子構造部か
ら発する音声を検知する手段と前記音声の周期的変化を
確認する手段を有することを特徴とし、もって、容易に
流量計の異常状態を検知できるようにしたものである。According to a first aspect of the present invention, there is provided a flow meter having a rotor structure, wherein a means for detecting a sound emitted from the rotor structure and a means for confirming a periodic change in the sound are provided. The present invention is characterized in that the flowmeter can easily detect an abnormal state of the flowmeter.
【０００６】請求項２の発明は、回転子構造部を有する
流量計において、前記回転子構造部から発する音声を音
声パターンとして検知する手段と、前記回転子構造部を
流通する流体の流量を流量パルスとして検知する手段
と、前記回転子構造部から発する音声の標準音声パター
ンを記憶する記憶手段を有し、前記流量パルスの所定値
毎に前記音声パターンを前記標準音声パターンと比較す
ることを特徴とし、もって、容易に僅かな異常状態を検
知できるようにしたものである。According to a second aspect of the present invention, there is provided a flow meter having a rotor structure, wherein a means for detecting a sound emitted from the rotor structure as a sound pattern, and a flow rate of a fluid flowing through the rotor structure are measured. Means for detecting as a pulse, and storage means for storing a standard sound pattern of a sound emitted from the rotor structure portion, wherein the sound pattern is compared with the standard sound pattern for each predetermined value of the flow rate pulse. Thus, a slight abnormal state can be easily detected.
【０００７】請求項３の発明は、請求項２の発明におい
て、前記流量計の主要流速点毎に標準音声パターンを備
え、前記流量計の使用が所定量計測或いは所定時間に到
達する毎に、前記音声パターンを当該標準音声パターン
と比較することを特徴とし、もって、より精密に異常の
検知を行うようにしたものである。According to a third aspect of the present invention, in the second aspect of the present invention, a standard voice pattern is provided for each of the main flow points of the flow meter, and each time the use of the flow meter reaches a predetermined amount or a predetermined time, It is characterized in that the voice pattern is compared with the standard voice pattern, thereby detecting the abnormality more precisely.
【０００８】[0008]
【発明の実施の形態】図１は、本発明の一実施例を説明
するための異常検知センサを有する流量計の分解斜視図
で、図中、１は流量計本体、２は計数部、３は小型マイ
クからなる音声センサ、４は磁気変化をピックアップす
るセンサコイルが内蔵されるような流量センサ、５は温
度センサ、６は演算処理回路部、７はＬＣＤ表示部、８
はアラーム信号送信線、電源線等のコネクタ、１ａは蓋
体、３ａ，３ｂ、３ｃはそれぞれ蓋体１ａに設けられた
音声センサ３、流量センサ４、温度センサ５の取り付け
に対応する凹穴部である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view of a flow meter having an abnormality detection sensor for explaining an embodiment of the present invention. Is a voice sensor composed of a small microphone, 4 is a flow sensor having a built-in sensor coil for picking up magnetic change, 5 is a temperature sensor, 6 is an arithmetic processing circuit unit, 7 is an LCD display unit, 8
Is a connector for an alarm signal transmission line, a power line, etc., 1a is a lid, 3a, 3b, 3c is a concave hole corresponding to the attachment of the voice sensor 3, flow rate sensor 4, and temperature sensor 5 provided on the lid 1a, respectively. It is.
【０００９】流量計本体１内には、図示されないが、オ
ーバルギヤ式容積流量計の場合にはオーバルギヤが、ロ
ータリーピストン式流量計の場合には回転子が、またタ
ービン式流量計の場合には羽根車がそれぞれ軸受けで支
持され、取り付けられている。Although not shown, an oval gear in the case of an oval gear type positive displacement meter, a rotor in the case of a rotary piston type flow meter, and a rotor in the case of a turbine type flow meter are not shown in the flow meter body 1. Are mounted with impellers each supported by bearings.
【００１０】流量計本体１と計数部２は、図示しない公
知の手段により一体化され、このとき、音声センサ３、
流量センサ４、温度センサ５は、それぞれ前記蓋体１ａ
の凹穴部３ａ，３ｂ，３ｃに嵌合するようになってい
る。なお、温度センサ５は公知の温度計であり、その出
力は流量の温度による体積補正等のために使用される。The main body 1 of the flow meter and the counting section 2 are integrated by known means (not shown).
The flow sensor 4 and the temperature sensor 5 are respectively connected to the lid 1a.
Are fitted in the concave holes 3a, 3b, 3c. The temperature sensor 5 is a known thermometer, and its output is used for volume correction based on the temperature of the flow rate.
【００１１】図２は、演算処理回路部６の回路構成ブロ
ック図で、図中、９は増幅器、１０は検波器、１１は積
分器、１２はゲート回路、１３は音声パターンのデジタ
ル変換回路、１４はゲート回路、１５は音声一致性チェ
ック回路、１６は８桁のカウンタ、１７はフリップフロ
ップ回路、１８は出荷時の音声パターンを記憶する標準
音声パターンメモリ、１９はゲート回路、２０はＯＲ回
路である。FIG. 2 is a block diagram showing a circuit configuration of the arithmetic processing circuit section 6. In FIG. 2, reference numeral 9 denotes an amplifier, 10 denotes a detector, 11 denotes an integrator, 12 denotes a gate circuit, 13 denotes a digital conversion circuit for an audio pattern, 14 is a gate circuit, 15 is a voice consistency check circuit, 16 is an 8-digit counter, 17 is a flip-flop circuit, 18 is a standard voice pattern memory for storing voice patterns at the time of shipment, 19 is a gate circuit, and 20 is an OR circuit. It is.
【００１２】流量計が稼動すると、流量計本体１内の図
示しない回転子が回転し、流量センサ４から流量パルス
が発信されると共に、回転による回転音が音声センサ３
によりピックアップされ電気信号に変換され、増幅器９
で増幅され、検波器１０で音声パターンとして検波され
る。When the flowmeter operates, a rotor (not shown) in the flowmeter main body 1 rotates, a flow rate pulse is transmitted from the flow rate sensor 4, and a rotation sound due to the rotation is output from the sound sensor 3.
Is picked up and converted into an electric signal by the amplifier 9
, And detected by the detector 10 as an audio pattern.
【００１３】いま、ａ側の場合は、検波された音声パタ
ーンは、図示しないオペアンプと抵抗及びコンデンサか
らなる積分器１１で積分してデジタル（パルス）信号に
変換し、ゲート回路１２に導入される。この音声はゲー
ト回路１２の時間内に正常状態では一定周期での流量パ
ルス列が得られるので、正常状態を確認することができ
る。回転子（例えば、羽根車）に破損、欠落等の異常状
態が生じた場合には、前記流量パルス列が変化し、また
音で検知の場合には、音のピーク・ピーク間が乱れるの
でその組合わせにて容易に異常状態を検知することがで
きる。On the a side, the detected voice pattern is integrated by an integrator 11 composed of an operational amplifier (not shown) and a resistor and a capacitor, converted into a digital (pulse) signal, and introduced into a gate circuit 12. . In the case of this sound, a flow pulse train with a constant period is obtained in a normal state within the time of the gate circuit 12, so that the normal state can be confirmed. When an abnormal state such as breakage or dropout occurs in a rotor (for example, an impeller), the flow pulse train changes, and in the case of detection by sound, the peak-to-peak sound is disturbed. The abnormal state can be easily detected by the combination.
【００１４】ｂ側の場合は、音声センサ３、増幅器９、
検波器１０からの音声パターンは、音声パターンのデジ
タル変換回路１３でデジタル信号に変換される。一方、
流量センサ４からの流量パルスは、１つは上記用途と
し、もう１つは８桁のカウンタ１６によりカウントさ
れ、例えば１００００カウント毎に１つのパルスを出力
し、フリップフロップ回路１７に送出される。該フリッ
プフロップ回路１７は、その都度動作してその出力パル
スは、ゲート回路１４、ゲート回路１９に入力する。On the b side, the voice sensor 3, the amplifier 9,
The audio pattern from the detector 10 is converted into a digital signal by an audio pattern digital conversion circuit 13. on the other hand,
One of the flow rate pulses from the flow rate sensor 4 is used for the above purpose, and the other is counted by an 8-digit counter 16. For example, one pulse is output every 10,000 counts and sent to the flip-flop circuit 17. The flip-flop circuit 17 operates each time, and its output pulse is input to the gate circuits 14 and 19.
【００１５】前記８桁のカウンタの代わりに所定時間経
過毎に１つのパルスを出力する時計装置を用いることも
可能である。Instead of the 8-digit counter, it is possible to use a clock device that outputs one pulse every predetermined time.
【００１６】音声パターンメモリ１８は、出荷時の音声
パターン（音紋）をある流量ポイント毎に複数点標準音
声パターンとしてデジタル信号にて記憶しており、フリ
ップフロップ回路１７の出力をゲート回路１９へ入力す
ることにより該ゲート回路１９を開路して前記標準音声
パターンを一致性チェック回路１５に出力するととも
に、ゲート回路１４を開路し、音声パターンのデジタル
変換回路１３からの音声パターンを一致性チェック回路
１５に取り込んで標準音声パターンと比較する。The voice pattern memory 18 stores a voice pattern (voice pattern) at the time of shipment as a digital signal of a plurality of standard voice patterns for each flow point, and outputs the output of the flip-flop circuit 17 to the gate circuit 19. By inputting the signal, the gate circuit 19 is opened to output the standard voice pattern to the consistency check circuit 15, and the gate circuit 14 is opened to output the voice pattern from the voice pattern digital conversion circuit 13 to the consistency check circuit 15. 15 and compared with the standard voice pattern.
【００１７】比較の結果、異常があれば、ＯＲ回路２０
を経てアラーム通報がコネクタ８（図１）から外部に発
信される。正常状態であれば、例えば１００００カウン
ト毎にフリップフロップ回路１７をリセットし、前記比
較動作を繰り返す。As a result of the comparison, if there is an abnormality, the OR circuit 20
Via the connector 8 (FIG. 1). In the normal state, for example, the flip-flop circuit 17 is reset every 10,000 counts, and the comparison operation is repeated.
【００１８】図３は、音声パターンと流量パルスの相関
を説明する図であり、図３（Ａ）は流量パルス、図３
（Ｂ）は音声パターンを示す。１音声パターン中のパル
スの繰り返しをチェックすることにより、パルス抜けか
ら、例えば羽根車の欠落等を検知し、また、パターン間
に存在する異常音声から、例えば軸受けに生じたひび等
を検知する。音声パターンＰ１，Ｐ１は、回転子の1回
転毎に変化する周期的なパターンとして波形の視認、或
いはピーク・ピーク（ｐ−ｐ）間の周期的な音の変化と
して感知される。異常がある場合は、例えば異常波形
（パルス）Ｐ２の存在により、或いは異常音を含む音の
変化として検知される。FIG. 3 is a diagram for explaining the correlation between the voice pattern and the flow rate pulse. FIG.
(B) shows a voice pattern. By checking the repetition of a pulse in one voice pattern, for example, a missing impeller or the like is detected from a missing pulse, and a crack or the like generated in a bearing is detected from an abnormal voice existing between the patterns. The voice patterns P 1 and P 1 are perceived as a periodic pattern that changes every rotation of the rotor, as a visual recognition of the waveform, or as a periodic sound change between peak and peak (pp). If there is abnormality is detected for example by the presence of abnormal waveform (pulse) P 2, or as a change of the sound including the abnormal sound.
【００１９】前記比較は、音声パターンのデジタル信号
により振幅、周期について標準音声パターンのそれと比
較されるので、振幅のチェックにより異常の程度、周期
のチェックにより軸受けの摩耗、羽根車のはずれ、ギヤ
の欠損、ひびの発生等の異常の種類を検知することがで
きる。従って、音の変化により異常の検知を行う手法よ
り僅かな異常でも精度高く検知することができる。In the comparison, since the amplitude and the period are compared with those of the standard sound pattern by the digital signal of the sound pattern, the degree of abnormality is checked by checking the amplitude, the wear of the bearing, the separation of the impeller, the gear It is possible to detect the type of abnormality such as occurrence of a defect or crack. Therefore, even a slight abnormality can be detected with higher accuracy than a method of detecting an abnormality by a change in sound.
【００２０】前記異常の検知は、流量計の使い始めか
ら、所定量計測或いは所定時間に到達する毎に例えば、
小流量（１００立方メートル／ｈ、中流量（５００立方
メートル／ｈ）、大流量（１０００立方メートル／ｈ）
等の主要流速点毎に定期的に行うことができる。この場
合、工場出荷時（メ−タ器差付時）に前記各流速点の音
声パターンを標準音声パターンとしてデジタル信号にて
記憶しておき、流量計の使用が、これらの所定量計測或
いは所定時間に到達する毎に音声パターンと自動的に当
該標準音声パターンとを比較することにより、より精密
に異常の検知を行う。The above abnormality is detected, for example, every time a predetermined amount is measured or a predetermined time is reached from the start of use of the flow meter.
Small flow rate (100 cubic meters / h), medium flow rate (500 cubic meters / h), large flow rate (1000 cubic meters / h)
Etc. can be performed periodically for each main flow point. In this case, at the time of shipment from the factory (when the meter is attached), the voice pattern of each of the flow velocity points is stored as a standard voice pattern as a digital signal. The abnormality is detected more precisely by automatically comparing the audio pattern with the standard audio pattern each time the time reaches.
【００２１】また、前記音声パターンや流量パルスは、
温度センサ５により流体の温度を検出し、該温度で体積
補正した流量に基づく音声パターン又は流量パルスと
し、前記基準音声パターンも温度補正を取り込んだ標準
音声パターンとしてもよい。The voice pattern and the flow rate pulse are as follows:
The temperature of the fluid may be detected by the temperature sensor 5, and a voice pattern or a flow rate pulse based on the flow rate volume-corrected at the temperature may be used, and the reference voice pattern may be a standard voice pattern incorporating the temperature correction.
【００２２】[0022]
【発明の効果】請求項１の発明によれば、回転子構造部
を有する流量計において、前記回転子構造部から発する
音声を検知する手段と前記音声の周期的変化を確認する
手段を有するので、容易に流量計の異常状態を検知する
ことができる。According to the first aspect of the present invention, in the flow meter having the rotor structure, there are provided means for detecting a sound emitted from the rotor structure and means for confirming a periodic change of the sound. Thus, the abnormal condition of the flow meter can be easily detected.
【００２３】請求項２の発明によれば、回転子構造部を
有する流量計において、前記回転子構造部から発する音
声を音声パターンとして検知する手段と、前記回転子構
造部を流通する流体の流量を流量パルスとして検知する
手段と、前記回転子構造部から発する音声の標準音声パ
ターンを記憶する記憶手段を有し、前記流量パルスの所
定値毎に前記音声パターンを前記標準音声パターンと比
較するので、容易に僅かな異常状態を検知することがで
きる。According to a second aspect of the present invention, in the flow meter having the rotor structure, means for detecting a sound emitted from the rotor structure as a sound pattern, and a flow rate of the fluid flowing through the rotor structure are provided. Means as a flow pulse, and storage means for storing a standard sound pattern of the sound emitted from the rotor structure, and for each predetermined value of the flow pulse, the sound pattern is compared with the standard sound pattern. Thus, a slight abnormal state can be easily detected.
【００２４】請求項３の発明によれば、請求項２の発明
の効果に加えて、前記流量計の主要流速点毎に標準音声
パターンを備え、前記流量計の使用が所定量計測或いは
所定時間に到達する毎に、前記音声パターンを当該標準
音声パターンと比較するので、より精密に異常の検知を
行う行うことができる。According to the invention of claim 3, in addition to the effect of the invention of claim 2, a standard voice pattern is provided for each of the main flow points of the flow meter, and the use of the flow meter measures a predetermined amount or a predetermined time. Since the voice pattern is compared with the standard voice pattern each time the data reaches the threshold, abnormal detection can be performed more precisely.
【図１】 本発明の一実施例を説明するための異常検知
センサ付き流量計の分解斜視図である。FIG. 1 is an exploded perspective view of a flow meter with an abnormality detection sensor for explaining one embodiment of the present invention.
【図２】 本発明が適用される演算処理回路部の回路構
成ブロック図である。FIG. 2 is a circuit block diagram of an arithmetic processing circuit unit to which the present invention is applied;
【図３】 本発明の音声パターンと流量パルスの相関を
説明する図である。FIG. 3 is a diagram illustrating a correlation between a voice pattern and a flow pulse according to the present invention.
１…流量計本体、１ａ…蓋体、２…計数部、３…音声セ
ンサ、３ａ，３ｂ，３ｃ…凹穴部、４…流量センサ、５
…温度センサ、６…演算処理回路部、７…ＬＣＤ表示
部、８…コネクタ、９…増幅器、１０…検波器、１１…
積分器、１２…ゲート回路、１３…音声パターンのデジ
タル変換回路、１４…ゲート回路、１５…音声一致性チ
ェック回路、１６…カウンタ、１７…フリップフロップ
回路、１８…標準音声パターンメモリ、１９…ゲート回
路、２０…ＯＲ回路。DESCRIPTION OF SYMBOLS 1 ... Flow meter main body, 1a ... Lid, 2 ... Counter part, 3 ... Voice sensor, 3a, 3b, 3c ... Concave hole part, 4 ... Flow sensor, 5
... temperature sensor, 6 ... arithmetic processing circuit section, 7 ... LCD display section, 8 ... connector, 9 ... amplifier, 10 ... detector, 11 ...
Integrator, 12: Gate circuit, 13: Digital conversion circuit of voice pattern, 14: Gate circuit, 15: Voice consistency check circuit, 16: Counter, 17: Flip-flop circuit, 18: Standard voice pattern memory, 19: Gate Circuit, 20 ... OR circuit.
Claims (3)
前記回転子構造部から発する音声を検知する手段と前記
音声の周期的変化を確認する手段を有することを特徴と
する異常検知機能付き流量計。1. A flow meter having a rotor structure,
A flow meter with an abnormality detection function, comprising: means for detecting a sound emitted from the rotor structure, and means for checking a periodic change in the sound.
前記回転子構造部から発する音声を音声パターンとして
検知する手段と、前記回転子構造部を流通する流体の流
量を流量パルスとして検知する手段と、前記回転子構造
部から発する音声の標準音声パターンを記憶する記憶手
段を有し、前記流量パルスの所定値毎に前記音声パター
ンを前記標準音声パターンと比較することを特徴とする
異常検知機能付き流量計。2. A flow meter having a rotor structure,
Means for detecting a sound emitted from the rotor structure as a sound pattern, means for detecting a flow rate of a fluid flowing through the rotor structure as a flow pulse, and a standard sound pattern of sound emitted from the rotor structure. A flowmeter with an abnormality detection function, comprising: storage means for storing, and comparing the voice pattern with the standard voice pattern for each predetermined value of the flow pulse.
ターンを備え、前記流量計の使用が所定量計測或いは所
定時間に到達する毎に、前記音声パターンを当該標準音
声パターンと比較することを特徴とする請求項２に記載
の異常検知機能付き流量計。3. A standard voice pattern is provided for each main flow point of the flow meter, and the voice pattern is compared with the standard voice pattern each time the use of the flow meter measures a predetermined amount or reaches a predetermined time. The flow meter with an abnormality detection function according to claim 2, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26645798A JP3638003B2 (en) | 1998-09-21 | 1998-09-21 | Flow meter with abnormality detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26645798A JP3638003B2 (en) | 1998-09-21 | 1998-09-21 | Flow meter with abnormality detection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000097740A true JP2000097740A (en) | 2000-04-07 |
| JP3638003B2 JP3638003B2 (en) | 2005-04-13 |
Family
ID=17431203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26645798A Expired - Fee Related JP3638003B2 (en) | 1998-09-21 | 1998-09-21 | Flow meter with abnormality detection function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3638003B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009222434A (en) * | 2008-03-13 | 2009-10-01 | Tokiko Techno Kk | Flow measuring instrument |
| JP2020101107A (en) * | 2018-12-20 | 2020-07-02 | 株式会社川本製作所 | Water supply device |
| CN112150672A (en) * | 2020-09-07 | 2020-12-29 | 南京莱斯网信技术研究院有限公司 | Intelligent door lock system capable of automatically judging abnormal state of door lock |
| CN113959536A (en) * | 2021-10-21 | 2022-01-21 | 宁波水表(集团)股份有限公司 | Noise removing method, equipment, medium and product of jet water meter |
-
1998
- 1998-09-21 JP JP26645798A patent/JP3638003B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009222434A (en) * | 2008-03-13 | 2009-10-01 | Tokiko Techno Kk | Flow measuring instrument |
| JP2020101107A (en) * | 2018-12-20 | 2020-07-02 | 株式会社川本製作所 | Water supply device |
| JP7262742B2 (en) | 2018-12-20 | 2023-04-24 | 株式会社川本製作所 | Water supply device |
| CN112150672A (en) * | 2020-09-07 | 2020-12-29 | 南京莱斯网信技术研究院有限公司 | Intelligent door lock system capable of automatically judging abnormal state of door lock |
| CN113959536A (en) * | 2021-10-21 | 2022-01-21 | 宁波水表(集团)股份有限公司 | Noise removing method, equipment, medium and product of jet water meter |
| CN113959536B (en) * | 2021-10-21 | 2023-11-21 | 宁波水表(集团)股份有限公司 | Denoising method, equipment, medium and product of jet water meter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3638003B2 (en) | 2005-04-13 |
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