JP3601123B2 - Ultrasonic flow meter - Google Patents

Description

【００１９】
ただし、ここでθは流れと超音波伝搬経路とのなす角であり、Ｌは流量測定部の長さである。
【００２０】
次に、流量Ｑはこの流速に流量測定部６の断面積ｓを乗じて算出される。
【００２１】
Ｑ＝ｋｖｓ
ただし、ここでｋは測定流速ｖを測定断面内の平均流速に換算するための補正係数である。
【００２２】
上記説明でＴ１およびＴ２の計測は繰返し行ったが、精度の良い計測が行われる場合は一回でも良い。
【００２３】
次に配管部１８におけるセンサ２１が何らかの異常、例えば地震による異常振動を検知するとモータ１３の制御部２２が作動し、モータ１３を駆動する。これにより回動開口板１０はあらかじめ定められた所定の角度だけ回転し、図５（ｂ）に示すごとく、回動開口板１０の閉鎖部３０、３１、３２が固定開口板９の開口部２４、２５、２６を閉止する。これにより、図１において、矢印ａ方向より流入する流れは流量制御弁１１にて閉止される。
【００２４】
この様に、上記構成により流量計測部と流量制御弁との間に整流部を配置することにより、全体の流路構成を直管状になるごとく構成でき、流量計全体をコンパクトな構成にすることができる。
【００２５】
また、流量制御弁をモータ駆動とし、回転型スライド弁を使用することにより、流れ方向の長さを短くすることができより、コンパクトな流量計を作成することができる。
【００２６】
上記実施例において押圧部材１２をコイルバネで示したが、板バネを用いても良い。
【００２７】
次に第２の実施例を図６を参照しながら説明する。図６において、４５は円環状の滑り部材である。上記以外は第１の実施例と同じゆえ、同一番号で示してある。
【００２８】
次に作動を述べる。
【００２９】
この実施例の場合は、滑り部材４５が回動開口板１０とバネ１２との間に配置されて動作すること以外は第１の実施例と同じである。
【００３０】
本実施例によれば、回動開口板１０とバネ１２との間に滑り部材を配置することにより、回動開口板１０の回転時における摩擦を少なくし、流量制御弁１１の動作信頼性を向上させることができる。次に第３の実施例を図７を参照しながら説明する。図７において、４６は固定開口板、４７は回動開口板である。回動開口板４７は、固定開口板４６と一体化されている軸４８により回動可能に保持されている。また、４９は回動開口板４６を固定開口板４５に押圧するバネである。５０はモータ、５１はギアであり、５２は軸である。５３は回動開口板４６の外周に形成されたギアである。５４はモータ５０のケーシングである。上記以外は第１の実施例と同じゆえ、同一番号で示してある。
【００３１】
また、固定開口板４６、および回動開口板４７の構成は図２と同様である。
【００３２】
次に作動を述べる。この実施例の場合は回動開口板４７が配管部１８の外部に配置されたモータ５０により、ギア５１を介して駆動されるところが第１の実施例と異なるのみで、それ以外の動作は同じである。本実施例によれば、回動開口板４７をギアを介したモータ駆動とし、配管部１８の外部に配置することにより、強い閉止力を得ると共に、測定流れへの影響を少なくし、精度の良い計測を実現することができる。
【００３３】
次に第４の実施例を図８を参照しながら説明する。図８において、５５は円環状の圧電体（駆動部）、５６は弾性体で構成された固定開口板、５７は摩擦リングで構成された回動開口板である。５８はバネであり、５９は摩擦リング５７と一体的に形成された軸、６０は軸受け部である。圧電体５５、弾性体固定開口板５６、摩擦リング回動開口板５７、バネ５８は全体として超音波モータ６１を形成している。また、その中で固定開口板５６と回動開口板５７とは流量制御弁６２を形成している。６３はリード線、６４は制御部である。
【００３４】
上記以外は第１の実施例と同じゆえ、同一番号で示してある。また、固定開口板４６、および回動開口板４７の構成は図２と同様である。
【００３５】
次に作動を述べる。
【００３６】
この実施例の場合は回動開口板５７が超音波モータ６１の構成にて駆動されるところが第１の実施例と異なるのみで、それ以外の動作は同じである。
【００３７】
本実施例によれば、回動開口板５７の駆動に超音波モータ６１を用いているため、低速回転で高トルクが得られ、流量制御弁６２の閉止力を高めることができるものである。また、構造的に流量制御弁６２と駆動部５５を一体的に形成できるためよりコンパクトな構成となる。
【００３８】
次に第５の実施例を図９を参照しながら説明する。図９において、６５は制御信号発生部であり、６６は遮断トリガ信号発生部、６７は遮断切換部である。上記以外は図４と同じゆえ、同一番号で示してある。また、全体構成は第四の実施例と同じである。この実施例の場合は、流量測定のための超音波と超音波モータ６１駆動のための超音波の周波数は同一である。
【００３９】
いま、センサ２１から信号が入ると遮断トリガ信号発生部６６にて送信部３５に対する動作にトリガがかけられる。これは流量計測動作に対して優先的に作動するよう構成されている。センサ２１からは遮断切換部６７に対しても同時に信号が送られ、発振部３９からの信号を同時に制御部６４に伝達する。これ以降の動作は第４の実施例と同じである。
【００４０】
本実施例によれば、流量測定用の周波数と流量制御弁駆動用の周波数を同一にすることにより、回路をシンプル化することができる。
【００４１】
次に第６の実施例を図１０を参照しながら説明する。
【００４２】
図１０において、６８は固定開口板、６９は回動開口板であり、固定開口板６８動開口板６９より流量制御弁７０が構成されている。７１は回動開口板６９を固定開口板６８に押圧するバネである。７２はモータ（駆動部）であり、７３はその軸である。軸７３は回動開口板６９に固定されており、その一端は固定開口板６８に設けられた軸受部７４にて回転可能に支持されている。モータ７２は保持具７５に取付けられており、保持具７５は支持部７６により管路７７に固定されている。７８はモータ７２のリード線であり、支持部７６の内部を通り、管路７７の外部に取出されている。７９は固定開口板６８、回転開口板６９、バネ７１を収納するための凹部である。８０は管路７７に取付けられたセンサ、８１はモータ７２の制御部である。
【００４３】
上記により、流量測定部６、流量制御弁７０、は直管状に配列されている。また、固定開口板４６、および回動開口板４７の構成は図２と同様である。信号処理の流れは図４と同様である。
【００４４】
次に作動を述べる。通常の計測動作時においては、回動開口板６９の開口部２４、２５、２６は、固定開口板６８の開口部２７、２８、２９と一致した状態、すなわち図５（ａ）に示す状態にある。
【００４５】
このとき、図１０において矢印ａの方向より流入した流れは流量測定部６を経た後、流量制御弁７０を経て、利用される対象（図示せず）に向かって矢印ｂのごとく流出する。信号処理は第１の実施例と同じである。
【００４６】
次に配管部７７におけるセンサ８０が何らかの異常を検知するとモータ７２の制御部８１が作動し、モータ７２を駆動する。これにより回動開口板６９はあらかじめ定められた所定の角度だけ回転し、図５（ｂ）に示すごとく、回動開口板６９の閉鎖部３０、３１、３２、が固定開口板６８の開口部２４、２５、２６を閉止する。これにより、図１において、矢印ａ方向より流入する流れは流量制御弁７０にて閉止される。この様に、流量制御弁７０を流量測定部６の下流側に配置することにより、遮断機能付き超音波流量計をよりコンパクトな構成にて実現できるものである。
【００４７】
次に第７の実施例を図１１を参照しながら説明する。図１１において８２は流量測定部であり、８３は流量測定部８２の一方の側に配置された第一の超音波振動子であり、８４は流量測定部８２の他方の側に配置された第二の超音波振動子である。この場合、超音波振動子８３、および８４は管路８５の外部に取付けられている。８６、８７は音響整合層である。上記以外は第６の実施例と同じゆえ、同一番号で示してある。
【００４８】
次に作動を述べる。この場合は、超音波振動子８３、および８４が管路８５の外部に取付けられているところが第６の実施例と異なるのみで、動作は同じである。
【００４９】
本実施例においては、流量制御弁７０を流量測定部８２の下流側に配置し、超音波振動子８３、および８４を管外に配置することにより、流れの遮断に関する信頼性を上げると共に、測定精度の低下を生じることが無い構成とすることができる。なお、本発明における信号処理は１チップマイコン等のマイクロコンピュータを用いて、ソフトウエア的に実現することも可能である。
【００５０】
以上のように本発明の各実施例によれば次の効果が得られる。
【００５１】
（１）流量測定と流量制御弁との間に整流部を配置することにより、全体の流路構成を直管状になるように構成でき、遮断機能付き流量計全体をコンパクトに構成できる。
【００５２】
（２）流量制御弁として回転型スライド弁を使用することにより、流れ方向の長さを短くすることができ、よりコンパクトな流量計を作製することができる。
【００５３】
（３）流量制御弁の押圧部と回動開口との間に滑り部材を配置することにより、流量制御弁の動作信頼性を向上することができる。
【００５４】
（４）流量制御弁をギアを介したモータ駆動とすることにより、強い閉止力を得ると共に、モータを配管部の外部に配置することにより、測定流れへの影響を少なくし、精度良く計測することができる。
【００５５】
（５）回動開口板の駆動に超音波モータを用いることにより、低速回転で高トルクが得られ、したがって流量制御弁の閉止力を高めることができ、また、構造的に流量制御弁と駆動部を一体的に形成できるため、よりコンパクトに構成できる。
【００５６】
（６）流量測定用の周波数と流量制御弁駆動用の周波数を同一にすることにより、回路をシンプル化することができる。
【００５７】
（７）流量制御弁を流量測定部の下流側に配置することにより、流量制御弁が、流れに与える影響を少なくし、流量測定精度を向上することができる。
【００５８】
（８）超音波振動子を管外に配置することにより、流れの遮断時における信頼性を向上することができる。
【００５９】
【発明の効果】
以上のように本発明によれば、全体の流路構成を直管状になるように構成でき、遮断機能付き流量計全体をコンパクトに構成できる。
【図面の簡単な説明】
【図１】本発明の第１の実施例の超音波流量計の垂直断面図
【図２】（ａ）同流量計における流量制御弁の固定開口板の平面図
（ｂ）同流量計における流量制御弁の回動開口板の平面図
【図３】同流量計における図１のＡ−Ａ’断面図
【図４】同流量計における制御ブロック図
【図５】（ａ）図２の固定開口板の開口部が開いている場合の平面図
（ｂ）図２の固定開口板の開口部が閉じている場合の平面図
【図６】本発明の第２の実施例の超音波流量計の垂直断面図
【図７】本発明の第３の実施例の超音波流量計の垂直断面図
【図８】本発明の第４の実施例の超音波流量計の垂直断面図
【図９】本発明の第５の実施例の制御ブロック図
【図１０】本発明の第６の実施例の超音波流量計の垂直断面図
【図１１】本発明の第７の実施例の超音波流量計の垂直断面図
【図１２】従来の超音波流量計の垂直断面図
【符号の説明】
６ 流量測定部
７ 第一の超音波振動子
８ 第二の超音波振動子
１１ 流量制御弁
１３ 駆動部
２２ 制御部
２３ 整流部[0001]
[Industrial applications]
The present invention relates to an ultrasonic flowmeter having a flow blocking function.
[0002]
[Prior art]
As a conventional measuring device of this type, as shown in FIG. 11, an ultrasonic flow rate measuring unit 3 is provided in an oblique direction between a gas inlet flow path 1 and an outlet flow path 2, and In some cases, a pressure regulator 4 and a shutoff valve 5 are arranged between the sonic flow measuring unit 3 and the sonic flow measuring unit 3.
[0003]
[Problems to be solved by the invention]
However, in this case, it was not possible to take a compact configuration due to the structure of the shut-off valve 5 and the configuration of the entire arrangement associated therewith.
[0004]
An object of the present invention is to solve the above-mentioned problem, and to provide a compact configuration by arranging a flow control valve and a flow measuring unit in a straight line .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a flow measurement unit, first and second ultrasonic transducers arranged in the flow measurement unit, and a flow rate for calculating a flow rate based on a signal from the transducer. An arithmetic unit, a flow control valve disposed upstream or downstream of the flow measurement unit, a driving unit of the flow control valve, and a control unit of the driving unit, and a flow passing through the flow control valve. The flow control valve and the flow measurement unit are arranged so that the flow of the flow measurement unit is substantially linear , and the flow control valve is disposed on the upstream side of the flow measurement unit, and has a fixed opening plate. A rotating opening plate, and a pressing member that enhances the adhesion between the rotating opening plate and the fixed opening plate, wherein the driving unit is a driving motor, and between the pressing member and the rotating opening plate. And a sliding member is disposed on the sliding member .
[0006]
[Action]
According to the present invention, with the above-described configuration, the entire flow path configuration can be made straight , and the flow rate measurement and the flow cutoff control can be performed with a compact configuration.
[0007]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0008]
In FIG. 1, reference numeral 6 denotes a flow measuring unit, 7 denotes a first ultrasonic vibrator disposed on one side of the flow measuring unit 6, and 8 denotes a first ultrasonic vibrator disposed on the other side of the flow measuring unit 6. This is a second ultrasonic transducer. Reference numeral 9 denotes a fixed opening plate, and reference numeral 10 denotes a rotating opening plate. The fixed opening plate 9 and the rotating opening plate 10 constitute a flow control valve 11. A spring (pressing member) 12 presses the rotating opening plate 10 against the fixed opening plate 9. Reference numeral 13 denotes a motor (drive unit), and reference numeral 14 denotes a shaft thereof. The shaft 14 is fixed to the rotation opening plate 10, and one end thereof is rotatably supported by a bearing 15 provided in the fixed opening plate 9. The motor 13 is attached to a holder 16, and the holder 16 is fixed to a pipe 18 by a support 17. Reference numeral 19 denotes a lead wire of the motor 13, which passes through the inside of the support portion 17 and is taken out of the pipe 18. Reference numeral 20 denotes a recess for accommodating the fixed opening plate 9, the rotating opening plate 10, and the spring 12. Reference numeral 21 denotes a sensor attached to the pipe 18, and reference numeral 22 denotes a control unit of the motor 13. 23 is a rectification unit.
[0009]
As described above, the flow control valve 11, the rectifying unit 23, and the flow measuring unit 6 are arranged in a straight tube. In FIG. 2, (a) shows the fixed aperture plate 9, and 24, 25, and 26 are the apertures. (B) shows the rotation opening plate 10, 27, 28, and 29 are the openings, and 30, 31, and 32 are the closing parts. FIG. 3 shows an AA ′ cross section of FIG.
[0010]
In FIG. 4, reference numeral 33 denotes a flow rate calculation unit which receives signals from the first ultrasonic vibrator 7 and the second ultrasonic vibrator 8 and performs a flow rate calculation. Among them, 34 is a start signal generating unit, 35 is a transmitting unit, 36 is a receiving unit, and 37 is a switching unit. The transmitting section 35 is composed of a trigger signal generating section 38 and an oscillating section 39. The receiving unit 36 includes a receiving signal amplifying unit 40 and a reference value comparing unit 41. 42 is a repetition unit, 43 is a clock unit, and 44 is a calculation unit.
[0011]
Next, the operation will be described. During a normal measurement operation, as shown in FIG. 5A, the flow control valve 11 is configured such that the openings 24, 25, 26 of the rotary opening plate 9 are connected to the openings 27, 28, 29 of the fixed opening plate 10. They are in the same state.
[0012]
At this time, the flow flowing from the direction of arrow a in FIG. 1 passes through the flow control valve 11, is rectified by the rectification unit 23 into a flow suitable for measurement, and is used through the flow measurement unit 6. It flows out as shown by an arrow b toward an object (not shown).
[0013]
When a signal is input from the start signal generating section 34 in such a state, the trigger signal generating section 38 operates, and the signal is sent to the switching section 37 by the oscillating section 39. The switching unit 37 is initially set such that the transmitting unit 35 is connected to the first ultrasonic vibrator 7 and the receiving unit 36 is connected to the second ultrasonic vibrator 8. Therefore, an ultrasonic signal is emitted from the first ultrasonic transducer 7 into the flow rate measuring section 6 by the trigger signal.
[0014]
This signal is received by the second ultrasonic transducer 8, amplified by the amplifier 40, and compared with the reference signal by the comparator 41. After this process is performed the number of times set by the repetition unit 42, a signal is sent to the timer unit 43. The timer 43 measures the elapsed time (T1) from the generation of the trigger signal to the signal transmitted at this time. On the other hand, when the repetition of the predetermined number of times is completed, a signal is sent from the repetition unit 42 to the switching unit 37, and the transmission unit 35 is connected to the second ultrasonic vibrator 8, and the reception unit 36 is connected to the first ultrasonic vibration Connect to child 7. At the same time, a drive signal to the trigger signal generator 38 is sent again.
[0015]
Thus, the same operation as described above is performed in the direction opposite to the flow, and the elapsed time (T2) is measured.
[0016]
Based on the elapsed times T1 and T2 measured in this manner, the flow rate is calculated by the calculation unit 44 by the following calculation formula.
[0017]
First, the flow velocity v is obtained by (Equation 1).
[0018]
(Equation 1)

[0019]
Here, θ is the angle between the flow and the ultrasonic wave propagation path, and L is the length of the flow measurement unit.
[0020]
Next, the flow rate Q is calculated by multiplying the flow rate by the cross-sectional area s of the flow rate measuring unit 6.
[0021]
Q = kvs
Here, k is a correction coefficient for converting the measured flow velocity v into the average flow velocity in the measurement cross section.
[0022]
In the above description, the measurement of T1 and T2 was repeatedly performed, but may be performed once when accurate measurement is performed.
[0023]
Next, when the sensor 21 in the piping section 18 detects any abnormality, for example, abnormal vibration due to an earthquake, the control section 22 of the motor 13 operates to drive the motor 13. As a result, the rotation opening plate 10 rotates by a predetermined angle, and as shown in FIG. 5B, the closing portions 30, 31, and 32 of the rotation opening plate 10 become the opening portions 24 of the fixed opening plate 9. , 25, 26 are closed. Thus, in FIG. 1, the flow flowing in from the direction of arrow a is closed by the flow control valve 11.
[0024]
In this way, by arranging the rectifying section between the flow measuring section and the flow control valve by the above configuration, the entire flow path configuration can be configured as if it were a straight tube, and the entire flow meter has a compact configuration. Can be.
[0025]
Also, by using a motor-driven flow control valve and using a rotary slide valve, the length in the flow direction can be reduced, and a more compact flowmeter can be created.
[0026]
Although the pressing member 12 is shown as a coil spring in the above embodiment, a leaf spring may be used.
[0027]
Next, a second embodiment will be described with reference to FIG. In FIG. 6, reference numeral 45 denotes an annular sliding member. The other parts are the same as those of the first embodiment, and are therefore denoted by the same reference numerals.
[0028]
Next, the operation will be described.
[0029]
This embodiment is the same as the first embodiment except that the sliding member 45 operates between the rotation opening plate 10 and the spring 12.
[0030]
According to the present embodiment, by disposing the sliding member between the rotation opening plate 10 and the spring 12, friction during rotation of the rotation opening plate 10 is reduced, and the operation reliability of the flow control valve 11 is improved. Can be improved. Next, a third embodiment will be described with reference to FIG. In FIG. 7, reference numeral 46 denotes a fixed opening plate, and 47 denotes a rotating opening plate. The rotation opening plate 47 is rotatably held by a shaft 48 integrated with the fixed opening plate 46. Reference numeral 49 denotes a spring that presses the rotation opening plate 46 against the fixed opening plate 45. 50 is a motor, 51 is a gear, and 52 is a shaft. Reference numeral 53 denotes a gear formed on the outer periphery of the rotary opening plate 46. 54 is a casing of the motor 50. The other parts are the same as those of the first embodiment, and are therefore denoted by the same reference numerals.
[0031]
The configurations of the fixed opening plate 46 and the rotating opening plate 47 are the same as those in FIG.
[0032]
Next, the operation will be described. This embodiment differs from the first embodiment only in that the rotary opening plate 47 is driven by the motor 50 disposed outside the pipe section 18 via the gear 51, and the other operations are the same. It is. According to the present embodiment, the rotary opening plate 47 is driven by a motor via a gear and is arranged outside the pipe section 18, so that a strong closing force is obtained, and the influence on the measurement flow is reduced. Good measurement can be realized.
[0033]
Next, a fourth embodiment will be described with reference to FIG. In FIG. 8, reference numeral 55 denotes an annular piezoelectric body (drive unit), 56 denotes a fixed opening plate made of an elastic body, and 57 denotes a rotating opening plate made of a friction ring. 58 is a spring, 59 is a shaft formed integrally with the friction ring 57, and 60 is a bearing. The piezoelectric body 55, the elastic body fixing opening plate 56, the friction ring rotating opening plate 57, and the spring 58 form an ultrasonic motor 61 as a whole. In addition, the fixed opening plate 56 and the rotating opening plate 57 form a flow control valve 62 therein. 63 is a lead wire, and 64 is a control unit.
[0034]
The other parts are the same as those of the first embodiment, and are therefore denoted by the same reference numerals. The configurations of the fixed opening plate 46 and the rotating opening plate 47 are the same as those in FIG.
[0035]
Next, the operation will be described.
[0036]
This embodiment differs from the first embodiment only in that the rotary aperture plate 57 is driven by the configuration of the ultrasonic motor 61, and the other operations are the same.
[0037]
According to the present embodiment, since the ultrasonic motor 61 is used to drive the rotary opening plate 57, high torque can be obtained at low speed rotation, and the closing force of the flow control valve 62 can be increased. Further, since the flow rate control valve 62 and the driving section 55 can be integrally formed structurally, the configuration becomes more compact.
[0038]
Next, a fifth embodiment will be described with reference to FIG. In FIG. 9, reference numeral 65 denotes a control signal generator, 66 denotes a cutoff trigger signal generator, and 67 denotes a cutoff switching unit. Except for the above, it is the same as FIG. The overall configuration is the same as in the fourth embodiment. In the case of this embodiment, the frequency of the ultrasonic wave for measuring the flow rate and the frequency of the ultrasonic wave for driving the ultrasonic motor 61 are the same.
[0039]
Now, when a signal is input from the sensor 21, an operation for the transmission unit 35 is triggered by the cutoff trigger signal generation unit 66. This is configured to operate preferentially with respect to the flow measurement operation. A signal is simultaneously sent from the sensor 21 to the cutoff switching unit 67, and a signal from the oscillation unit 39 is simultaneously transmitted to the control unit 64. Subsequent operations are the same as in the fourth embodiment.
[0040]
According to the present embodiment, the circuit can be simplified by making the frequency for flow measurement and the frequency for driving the flow control valve the same.
[0041]
Next, a sixth embodiment will be described with reference to FIG.
[0042]
In FIG. 10, reference numeral 68 denotes a fixed opening plate, and 69 denotes a rotary opening plate. The fixed opening plate 68 and the dynamic opening plate 69 constitute a flow control valve 70. Reference numeral 71 denotes a spring that presses the rotation opening plate 69 against the fixed opening plate 68. 72 is a motor (drive unit), and 73 is its shaft. The shaft 73 is fixed to a rotation opening plate 69, and one end thereof is rotatably supported by a bearing 74 provided in the fixed opening plate 68. The motor 72 is mounted on a holder 75, and the holder 75 is fixed to a pipe 77 by a support 76. Reference numeral 78 denotes a lead wire of the motor 72, which passes through the inside of the support portion 76 and is taken out of the pipe 77. Reference numeral 79 denotes a recess for accommodating the fixed opening plate 68, the rotating opening plate 69, and the spring 71. Reference numeral 80 denotes a sensor attached to the pipe 77, and reference numeral 81 denotes a control unit of the motor 72.
[0043]
As described above, the flow measuring unit 6 and the flow control valve 70 are arranged in a straight tube. The configurations of the fixed opening plate 46 and the rotating opening plate 47 are the same as those in FIG. The flow of signal processing is the same as in FIG.
[0044]
Next, the operation will be described. During a normal measurement operation, the openings 24, 25, and 26 of the rotary opening plate 69 are brought into a state in which the openings 24, 25, and 26 match the openings 27, 28, and 29 of the fixed opening plate 68, that is, a state shown in FIG. is there.
[0045]
At this time, the flow that flows in the direction of arrow a in FIG. 10 passes through the flow measuring unit 6 and then flows out through the flow control valve 70 toward the object to be used (not shown) as indicated by arrow b. The signal processing is the same as in the first embodiment.
[0046]
Next, when the sensor 80 in the pipe section 77 detects any abnormality, the control section 81 of the motor 72 operates to drive the motor 72. As a result, the rotation opening plate 69 rotates by a predetermined angle, and the closing portions 30, 31, and 32 of the rotation opening plate 69 are closed by the opening portions of the fixed opening plate 68 as shown in FIG. 24, 25 and 26 are closed. Thereby, in FIG. 1, the flow flowing from the direction of arrow a is closed by the flow control valve 70. By arranging the flow control valve 70 on the downstream side of the flow measuring unit 6 in this manner, an ultrasonic flow meter with a shut-off function can be realized with a more compact configuration.
[0047]
Next, a seventh embodiment will be described with reference to FIG. In FIG. 11, reference numeral 82 denotes a flow measuring unit, 83 denotes a first ultrasonic vibrator disposed on one side of the flow measuring unit 82, and 84 denotes a first ultrasonic vibrator disposed on the other side of the flow measuring unit 82. This is the second ultrasonic transducer. In this case, the ultrasonic transducers 83 and 84 are mounted outside the pipe 85. 86 and 87 are acoustic matching layers. Except for the above, the sixth embodiment is the same as the sixth embodiment, and is therefore denoted by the same reference numerals.
[0048]
Next, the operation will be described. In this case, the operation is the same as that of the sixth embodiment, except that the ultrasonic vibrators 83 and 84 are mounted outside the conduit 85.
[0049]
In the present embodiment, the flow control valve 70 is arranged downstream of the flow measuring unit 82, and the ultrasonic vibrators 83 and 84 are arranged outside the pipe, so that the reliability of the flow interruption is improved and the measurement is performed. A configuration that does not cause a decrease in accuracy can be provided. Note that the signal processing in the present invention can be realized by software using a microcomputer such as a one-chip microcomputer.
[0050]
As described above, according to the embodiments of the present invention, the following effects can be obtained.
[0051]
(1) By arranging the rectifying section between the flow measurement and the flow control valve, the entire flow path configuration can be configured as a straight tube, and the entire flow meter with a shut-off function can be configured compact.
[0052]
(2) By using a rotary slide valve as the flow control valve, the length in the flow direction can be shortened, and a more compact flow meter can be manufactured.
[0053]
(3) By arranging the sliding member between the pressing portion of the flow control valve and the rotation opening, the operation reliability of the flow control valve can be improved.
[0054]
(4) The flow control valve is driven by a motor through a gear to obtain a strong closing force, and the motor is arranged outside the piping to reduce the influence on the measurement flow and measure accurately. be able to.
[0055]
(5) By using an ultrasonic motor for driving the rotary opening plate, a high torque can be obtained at a low speed rotation, so that the closing force of the flow control valve can be increased. Since the portions can be formed integrally, a more compact configuration can be achieved.
[0056]
(6) The circuit can be simplified by making the frequency for flow measurement and the frequency for driving the flow control valve the same.
[0057]
(7) By arranging the flow control valve on the downstream side of the flow measurement unit, the flow control valve can reduce the influence on the flow and improve the flow measurement accuracy.
[0058]
(8) By arranging the ultrasonic vibrator outside the pipe, the reliability at the time of flow interruption can be improved.
[0059]
【The invention's effect】
As described above, according to the present invention, the entire flow path configuration can be configured to be a straight tube, and the entire flow meter with a shutoff function can be configured to be compact.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of an ultrasonic flow meter according to a first embodiment of the present invention; FIG. 2 (a) is a plan view of a fixed opening plate of a flow control valve in the flow meter; FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 1 in the flow meter. FIG. 4 is a control block diagram in the flow meter. FIG. FIG. 6 (b) is a plan view when the opening of the plate is open. FIG. 6 (b) is a plan view when the opening of the fixed opening plate in FIG. 2 is closed. FIG. 7 is a vertical sectional view of an ultrasonic flowmeter according to a third embodiment of the present invention. FIG. 8 is a vertical sectional view of an ultrasonic flowmeter according to a fourth embodiment of the present invention. FIG. 10 is a control block diagram of a fifth embodiment of the present invention. FIG. 10 is a vertical sectional view of an ultrasonic flowmeter of a sixth embodiment of the present invention. FIG. 11 is an ultrasonic flow rate of a seventh embodiment of the present invention. Vertical sectional view of meter [Figure 12] Vertical sectional view of conventional ultrasonic flow meter [Explanation of reference numerals]
6 Flow rate measuring unit 7 First ultrasonic vibrator 8 Second ultrasonic vibrator 11 Flow control valve 13 Drive unit 22 Control unit 23 Rectifying unit

Claims (6)

A flow measurement unit, first and second ultrasonic transducers arranged in the flow measurement unit, a flow calculation unit that calculates a flow rate based on a signal from the transducer, and an upstream side of the flow measurement unit Or a flow control valve disposed on the downstream side, a drive unit for the flow control valve, and a control unit for the drive unit, wherein the flow passing through the flow control valve and the flow of the flow measurement unit are substantially linear. The flow control valve and the flow measurement unit are arranged so as to form a shape, the flow control valve is disposed on the upstream side of the flow measurement unit, a fixed opening plate, a rotation opening plate, the rotation opening An ultrasonic flowmeter having a pressing member for increasing the adhesion between the plate and the fixed opening plate, wherein the driving section is a driving motor, and a sliding member disposed between the pressing member and the rotating opening plate. . A flow measurement unit, first and second ultrasonic transducers arranged in the flow measurement unit, a flow calculation unit that calculates a flow rate based on a signal from the transducer, and an upstream side of the flow measurement unit Or a flow control valve disposed on the downstream side, a drive unit for the flow control valve, and a control unit for the drive unit, wherein the flow passing through the flow control valve and the flow of the flow measurement unit are substantially linear. wherein said flow control valve so that the Jo arranged in a flow measurement section, the place rectifier between the flow control valve and said flow rate measurement unit, the flow control valve is disposed upstream of the flow measurement section A fixed opening plate, a rotating opening plate, and a pressing member for increasing the adhesion between the rotating opening plate and the fixed opening plate, wherein the driving unit is a drive motor, and the pressing member and the rotating opening plate Ultrasonic flowmeter with a sliding member between the two . A flow measurement unit, first and second ultrasonic transducers arranged in the flow measurement unit, a flow calculation unit that calculates a flow rate based on a signal from the transducer, and an upstream side of the flow measurement unit Or a flow control valve disposed on the downstream side, a drive unit for the flow control valve, and a control unit for the drive unit, wherein the flow passing through the flow control valve and the flow of the flow measurement unit are substantially linear. the Jo to become like the flow control valve and the flow measurement section is arranged, the flow control valve is disposed upstream of the flow measurement section, and the fixed aperture plate, and the rotating aperture plate, the pivot opening and a pressing member to increase the adhesion of the plate the fixed aperture plate, wherein the drive unit is Ri Oh a driving motor, the rotating aperture plate is attached to the shaft of the drive motor ambient is formed in a gear shape An ultrasonic flowmeter comprising: a gear that meshes with the rotation opening plate . A flow measurement unit, first and second ultrasonic transducers arranged in the flow measurement unit, a flow calculation unit that calculates a flow rate based on a signal from the transducer, and an upstream side of the flow measurement unit Or a flow control valve disposed on the downstream side, a drive unit for the flow control valve, and a control unit for the drive unit, wherein the flow passing through the flow control valve and the flow of the flow measurement unit are substantially linear. The flow control valve and the flow measurement unit are arranged so as to form a rectification unit between the flow control valve and the flow measurement unit, the flow control valve is located upstream of the flow measurement unit A fixed opening plate, a rotating opening plate, and a pressing member for increasing the adhesion between the rotating opening plate and the fixed opening plate, the driving unit being a drive motor, the rotating opening The plate is formed in a gear shape on the periphery, and is attached to a shaft of the drive motor, and the rotation opening plate is provided. Ultrasonic flowmeter comprising a gear that meshes. A flow measurement unit, first and second ultrasonic transducers arranged in the flow measurement unit, a flow calculation unit that calculates a flow rate based on a signal from the transducer, and an upstream side of the flow measurement unit Or a flow control valve disposed on the downstream side, a drive unit for the flow control valve, and a control unit for the drive unit, wherein the flow passing through the flow control valve and the flow of the flow measurement unit are substantially linear. The flow control valve and the flow measurement unit are arranged so as to form a shape, the flow control valve is disposed on the upstream side of the flow measurement unit, a fixed opening plate, a rotation opening plate, the rotation opening An ultrasonic wave having a pressing member for increasing the adhesion between the plate and the fixed opening plate, wherein the drive unit is a drive motor, and the oscillation frequency of the flow rate calculation unit and the drive frequency of the flow rate control valve are the same. Flow meter. A flow measurement unit, first and second ultrasonic transducers arranged in the flow measurement unit, a flow calculation unit that calculates a flow rate based on a signal from the transducer, and an upstream side of the flow measurement unit Or a flow control valve disposed on the downstream side, a drive unit for the flow control valve, and a control unit for the drive unit, wherein the flow passing through the flow control valve and the flow of the flow measurement unit are substantially linear. The flow control valve and the flow measurement unit are arranged so as to be in a shape, a rectification unit is disposed between the flow control valve and the flow measurement unit, and the flow control valve is disposed upstream of the flow measurement unit. A fixed opening plate, a rotating opening plate, and a pressing member for increasing the adhesion between the rotating opening plate and the fixed opening plate; the driving unit being a driving motor; An ultrasonic flowmeter wherein the frequency and the driving frequency of the flow control valve are the same .

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