JP2000266576A - Pressure type flow meter - Google Patents
Pressure type flow meterInfo
- Publication number
- JP2000266576A JP2000266576A JP11068559A JP6855999A JP2000266576A JP 2000266576 A JP2000266576 A JP 2000266576A JP 11068559 A JP11068559 A JP 11068559A JP 6855999 A JP6855999 A JP 6855999A JP 2000266576 A JP2000266576 A JP 2000266576A
- Authority
- JP
- Japan
- Prior art keywords
- measuring device
- pressure
- fluid
- flow rate
- sectional area
- 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.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
(57)【要約】
【課題】 構造物の完成後に於いても設置が可能で、測
定部の洗浄が容易で、設置後のメンテナンスが容易な圧
力式流量計を提供すること。
【解決手段】 流体８の流れの方向に逆らって設置され
流体の動圧Ｖｄを計測する圧力測定器１と、流体８の流
れの方向に沿って設置され流体Ｖｓの静圧を計測する圧
力測定器２と、動圧Ｖｄおよび静圧Ｖｓから流体の流速
Ｖを演算する流速算出器４と、断面積算出器５で演算し
た断面積Ｓと流速算出器４で演算した流速Ｖとを乗算し
て流体８の流量Ｆを算出する流量算出器６とを備えたこ
とを特徴としている。
(57) [Problem] To provide a pressure type flow meter which can be installed even after the completion of a structure, can easily clean a measuring section, and can be easily maintained after the installation. SOLUTION: A pressure measuring device 1 is installed opposite to the flow direction of the fluid 8 and measures the dynamic pressure Vd of the fluid, and a pressure measurement is installed along the flow direction of the fluid 8 and measures the static pressure of the fluid Vs. A flow rate calculator 4 for calculating the fluid flow velocity V from the dynamic pressure Vd and the static pressure Vs, and a cross-sectional area S calculated by the cross-sectional area calculator 5 multiplied by the flow velocity V calculated by the flow rate calculator 4. And a flow rate calculator 6 for calculating the flow rate F of the fluid 8.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、開渠式水路を有す
る箇所に使用される圧力式流量計に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure type flow meter used in a place having an open channel.
【０００２】[0002]
【従来の技術】従来は堰式やベンチュリー式などのよう
に絞り機構を利用した流量計が使用されている。2. Description of the Related Art Conventionally, a flow meter utilizing a throttle mechanism, such as a weir type or a venturi type, has been used.
【０００３】[0003]
【発明が解決しようとする課題】従来の技術では、建築
構造物内の配管に設けられる流量計においては、構造物
を完成した後に流量計を取付けることが困難である他、
構造物のために保守管理が困難であった。また、絞り機
構を有するために、下部に堆積物が蓄積し、正常な測定
が困難となることがあった。According to the prior art, it is difficult to install a flow meter after the structure is completed in a flow meter provided in a pipe in a building structure.
Maintenance was difficult due to the structure. In addition, due to the aperture mechanism, deposits may accumulate in the lower portion, making normal measurement difficult.
【０００４】本発明は、構造物の完成後に於いても設置
が可能で、測定部の洗浄が容易で、設置後のメンテナン
スが容易な圧力式流量計を提供することを目的としてい
る。It is an object of the present invention to provide a pressure type flow meter which can be installed even after the completion of a structure, can easily clean the measuring section, and can be easily maintained after the installation.
【０００５】[0005]
【課題を解決するための手段】本発明の圧力式流量計
は、流体の流れの方向に逆らって設置され流体の動圧を
計測する第１の圧力測定器と、流体の流れの方向に沿っ
て設置され流体の静圧を計測する第２の圧力測定器と、
前記第１の圧力測定器によって計測された動圧、および
前記第２の圧力測定器によって計測された静圧から流体
の流速を演算する流速算出器と、流体の液位を測定する
液体液位測定器と、この液体液位測定器によって測定し
た液位と予め測定しておいた水路の幅寸法とから水路の
断面積を演算する断面積算出器と、この断面積算出器で
演算した断面積と前記流速算出器で演算した流速とを乗
算して流体の流量を算出する流量算出器とを備えたこと
を特徴としている。SUMMARY OF THE INVENTION A pressure type flow meter according to the present invention includes a first pressure measuring device which is installed in a direction opposite to a flow direction of a fluid and measures a dynamic pressure of the fluid, A second pressure measuring device installed to measure the static pressure of the fluid,
A flow rate calculator that calculates the flow rate of the fluid from the dynamic pressure measured by the first pressure gauge and the static pressure measured by the second pressure gauge; and a liquid level that measures the level of the fluid. A measuring device, a cross-sectional area calculator for calculating the cross-sectional area of the water channel from the liquid level measured by the liquid level measuring device and the width dimension of the water channel measured in advance, and a cross-sectional area calculated by the cross-sectional area calculator. A flow rate calculator for multiplying the area by the flow rate calculated by the flow rate calculator to calculate the flow rate of the fluid.
【０００６】即ち、第１の圧力測定器によって計測した
流体の圧力（動圧＋静圧）をＰ、第２の圧力測定器によ
って計測した流体の静圧をＰｓとすると、動圧Ｐｄは次
式によって求められる。That is, assuming that the pressure of the fluid (dynamic pressure + static pressure) measured by the first pressure measuring device is P and the static pressure of the fluid measured by the second pressure measuring device is Ps, the dynamic pressure Pd is It is determined by the formula.
【０００７】Ｐｄ＝Ｐ−Ｐｓ 次に、流体の質量（固定値）をＮ、Ｖ0 を初速度、経過
時間をｔとすると、流体加速度ａおよび流体速度Ｖは次
式によって算出できる。Pd = P−Ps Next, assuming that the mass (fixed value) of the fluid is N, V 0 is the initial velocity, and the elapsed time is t, the fluid acceleration a and the fluid velocity V can be calculated by the following equations.
【０００８】 ａ＝Ｐｄ／Ｎ＝（Ｐ−Ｐｓ）／Ｎ Ｖ＝Ｖ0 ＋ａｔ ＝Ｖ0 ＋（（Ｐ−Ｐｓ）／Ｎ）×ｔ 次に、流体の液位を液体液位測定器にて測定し、測定値
を断面積変換器に入力し、次の演算式ｆ（ｌ）により流
体断面積Ｓを算出する。A = Pd / N = (P−Ps) / NV = V 0 + at = V 0 + ((P−Ps) / N) × t Next, the liquid level of the fluid is measured by a liquid level measuring device. The measured value is input to the cross-sectional area converter, and the fluid cross-sectional area S is calculated by the following equation f (l).
【０００９】Ｓ＝ｆ（ｌ） 更に、流体速度Ｖおよび流体断面積Ｓを流量変換器
（ｆ）に入力し下記演算により流量Ｆを算出する。S = f (l) Further, the fluid velocity V and the fluid sectional area S are inputted to the flow rate converter (f), and the flow rate F is calculated by the following calculation.
【００１０】Ｆ＝Ｖ×Ｓ＝（Ｖ0 ＋（（Ｐ−Ｐｓ）／
Ｎ）×ｔ）×ｆ（ｌ） また、本発明の圧力式流量計は、流体の流れの方向に逆
らって設置され流体の動圧を計測する第１の圧力測定器
と、流体の流れの方向に沿って設置され流体の静圧を計
測する第２の圧力測定器と、前記第１の圧力測定器によ
って計測された動圧および前記第２の圧力測定器によっ
て計測された静圧から流体の流れる速さの加速度を演算
する加速度変換器と、この加速度変換器から出力された
加速度に初速度および計測までの時間を入力して流体の
流速を演算する流速変換器と、流体の液位を測定する液
体液位測定器と、この液体液位測定器によって測定した
液位と予め測定しておいた水路の幅寸法とから水路の断
面積を演算する断面積算出器と、この断面積算出器で演
算した断面積と前記流速変換器で演算した流速とを乗算
して流体の流量を算出する流量算出器とを備えたことを
特徴としている。F = V × S = (V 0 + ((P−Ps) /
N) × t) × f (l) Further, the pressure type flow meter of the present invention is provided with a first pressure measuring device installed opposite to the direction of the fluid flow to measure the dynamic pressure of the fluid, A second pressure measuring device installed along the direction to measure a static pressure of the fluid, and a fluid from the dynamic pressure measured by the first pressure measuring device and the static pressure measured by the second pressure measuring device An acceleration converter for calculating the acceleration of the flow speed of the fluid; a flow velocity converter for calculating the flow velocity of the fluid by inputting the initial velocity and the time until the measurement to the acceleration output from the acceleration converter; and a liquid level of the fluid. A liquid level measuring device for measuring the liquid level, a cross-sectional area calculator for calculating the cross-sectional area of the channel from the liquid level measured by the liquid level measuring device and the width dimension of the channel previously measured, and the cross-sectional area The cross-sectional area calculated by the calculator and the flow velocity calculated by the flow velocity converter are It is characterized in that a flow rate calculator for calculation to calculate the flow rate of the fluid.
【００１１】さらに、本発明の圧力式流量計は、第１の
圧力測定器、第２の圧力測定器または液体液位測定器の
いずれか１つ以上を複数個並列に設置し、これら平均値
を算出して流量を演算することを特徴としており、流体
圧力、静圧、断面積測定用水位測定部を複数設け、複数
箇所で採取した値の平均値を用いて処理を行なうことで
より正確な値にすること、及び故障時のバックアップを
行なうことができる。さらに、本発明の圧力式流量計
は、第１の圧力測定器、第２の圧力測定器または液体液
位測定器のいずれか１つ以上に洗浄機能を備えたことを
特徴としており、このように構成したので、圧力測定部
は構造物に左右されず、後設置が可能且つ容易である。
また、測定部に逆圧水を与えることにより測定部の洗浄
を行なえるし、設置後に於いても構造物に左右されない
ため、メンテナンス容易である。Further, in the pressure type flow meter according to the present invention, a plurality of one or more of the first pressure measuring device, the second pressure measuring device and the liquid level measuring device are installed in parallel, and their average values are measured. It is characterized by calculating the flow rate and calculating the flow rate, providing more than one water level measuring unit for measuring fluid pressure, static pressure and cross-sectional area, and performing processing using the average value of the values collected at multiple locations. Value and backup at the time of failure can be performed. Further, the pressure type flow meter of the present invention is characterized in that at least one of the first pressure measuring device, the second pressure measuring device and the liquid level measuring device has a cleaning function. , The pressure measuring unit is not affected by the structure, and can be installed later and easily.
In addition, the measurement section can be washed by supplying counter-pressure water to the measurement section, and maintenance is easy because the measurement section is not affected by the structure even after installation.
【００１２】[0012]
【発明の実施の形態】次に本発明の圧力式流量計の実施
の形態を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the pressure type flow meter of the present invention will be described.
【００１３】図１において、圧力測定器１は流体８の流
れの方向Ｋに逆らって設置され流体８の動圧Ｐｄを計測
する測定器であり、圧力測定器２は流体８の流れの方向
に沿って設置され流体８の静圧Ｐｓを計測する測定器で
ある。In FIG. 1, a pressure measuring device 1 is a measuring device which is installed opposite to a flow direction K of a fluid 8 and measures a dynamic pressure Pd of the fluid 8. This is a measuring instrument that is installed along and measures the static pressure Ps of the fluid 8.
【００１４】流速算出器４は圧力測定器１および圧力測
定器２に接続され、圧力測定器１によって計測された動
圧Ｐｄ、および圧力測定器２によって計測された静圧Ｐ
ｓから流体８の流速Ｖを演算する装置である。The flow velocity calculator 4 is connected to the pressure measuring device 1 and the pressure measuring device 2, and the dynamic pressure Pd measured by the pressure measuring device 1 and the static pressure Pd measured by the pressure measuring device 2
This is a device for calculating the flow velocity V of the fluid 8 from s.
【００１５】液体液位測定器３は流体８の液位を測定す
る装置であり、断面積算出器５は液体液位測定器３に接
続され、液体液位測定器３によって測定した液位ｌと予
め測定しておいた水路７の幅寸法Ｗとから水路７の断面
積Ｓを演算する装置である。流量算出器６は流速算出器
４と断面積算出器５とに接続され、断面積算出器５で演
算した断面積Ｓと、流速算出器４で演算した流速Ｖとを
乗算して流体８の流量Ｆを算出する装置である。The liquid level measuring device 3 is a device for measuring the liquid level of the fluid 8, and the cross-sectional area calculator 5 is connected to the liquid level measuring device 3 and measures the liquid level 1 measured by the liquid level measuring device 3. This is a device for calculating the cross-sectional area S of the water channel 7 from the following and the width dimension W of the water channel 7 measured in advance. The flow rate calculator 6 is connected to the flow rate calculator 4 and the cross-sectional area calculator 5, and multiplies the cross-sectional area S calculated by the cross-sectional area calculator 5 by the flow velocity V calculated by the flow rate calculator 4 to calculate the flow rate of the fluid 8. This is a device for calculating the flow rate F.
【００１６】本発明の他の実施の形態としては、図示し
てはいないが、圧力測定器１によって計測された動圧Ｐ
ｄ、および圧力測定器２によって計測された静圧Ｐｓか
ら流体８の流れる速さの加速度ａを演算する加速度変換
器と、加速度変換器から出力された加速度ａに、初速度
Ｖ0 および計測までの時間ｔを入力して流体８の流速Ｖ
を演算する流速変換器とを備えたことを特徴としてい
る。According to another embodiment of the present invention, although not shown, the dynamic pressure P
d, and an acceleration converter that calculates the acceleration a of the speed at which the fluid 8 flows from the static pressure Ps measured by the pressure measuring device 2, and the acceleration a output from the acceleration converter to the initial speed V 0 and the measurement. Of the fluid 8 by inputting the time t
And a flow velocity converter that calculates
【００１７】さらに本発明の他の実施の形態としては、
図示してはいないが、圧力測定器１、圧力測定器２また
は液体液位測定器３のいずれか１つ以上を複数個並列に
設置し、これらの平均値を算出して流量Ｆを演算するこ
とを特徴としている。Further, as another embodiment of the present invention,
Although not shown, at least one of the pressure measuring device 1, the pressure measuring device 2, and the liquid level measuring device 3 are installed in parallel and a flow rate F is calculated by calculating an average value thereof. It is characterized by:
【００１８】請求項４に記載した圧力式流量計の実施の
形態としては、図示してはいないが、圧力測定器１、圧
力測定器２または液体液位測定器３のいずれか１つ以上
に洗浄機能を備えたことを特徴としている。As an embodiment of the pressure type flow meter according to the fourth aspect, although not shown, any one or more of the pressure measuring device 1, the pressure measuring device 2, and the liquid level measuring device 3 may be used. It is characterized by having a washing function.
【００１９】[0019]
【発明の効果】本発明によれば、構造物を完成した後に
於いても圧力式流量計の設置が可能であり、測定部の洗
浄が容易であり、設置後においてもメンテナンスが容易
である。According to the present invention, the pressure type flow meter can be installed even after the structure is completed, the measuring section can be easily cleaned, and maintenance is easy even after installation.
【図１】本発明の実施の−形態例を示す圧力式流量計の
説明図である。FIG. 1 is an explanatory view of a pressure type flow meter showing an embodiment of the present invention.
１ 圧力測定器 ２ 圧力測定器 ３ 液体液位測定器 ４ 流速算出器 ５ 断面積算出器 ６ 流量算出器 ７ 水路 ８ 流体 DESCRIPTION OF SYMBOLS 1 Pressure measuring device 2 Pressure measuring device 3 Liquid level measuring device 4 Flow velocity calculator 5 Cross-sectional area calculator 6 Flow rate calculator 7 Water channel 8 Fluid
Claims (4)
記流体の動圧を計測する第１の圧力測定器と、前記流体
の流れの方向に沿って設置され前記流体の静圧を計測す
る第２の圧力測定器と、前記第１の圧力測定器によって
計測された前記動圧および前記第２の圧力測定器によっ
て計測された前記静圧から前記流体の流速を演算する流
速算出器と、前記流体の液位を測定する液体液位測定器
と、この液体液位測定器によって測定した前記液位と予
め測定しておいた水路の幅寸法とから前記水路の断面積
を演算する断面積算出器と、この断面積算出器で演算し
た前記断面積と、前記流速算出器で演算した前記流速と
を乗算して前記流体の流量を算出する流量算出器と、を
具備してなる圧力式流量計。1. A first pressure measuring device installed opposite to a flow direction of a fluid and measuring a dynamic pressure of the fluid, and a first pressure measuring device installed along a flow direction of the fluid and measuring a static pressure of the fluid. A second pressure measuring device, a flow rate calculator that calculates the flow rate of the fluid from the dynamic pressure measured by the first pressure measuring device and the static pressure measured by the second pressure measuring device, A liquid level measuring device for measuring a liquid level of the fluid, and a cross-sectional area for calculating a cross-sectional area of the water channel from the liquid level measured by the liquid level measuring device and a width dimension of the water channel measured in advance. A pressure equation comprising a calculator, a flow rate calculator that calculates the flow rate of the fluid by multiplying the cross-sectional area calculated by the cross-sectional area calculator and the flow rate calculated by the flow rate calculator. Flowmeter.
記流体の動圧を計測する第１の圧力測定器と、前記流体
の流れの方向に沿って設置され前記流体の静圧を計測す
る第２の圧力測定器と、前記第１の圧力測定器によって
計測された前記動圧、および前記第２の圧力測定器によ
って計測された前記静圧から前記流体の流れる速さの加
速度を演算する加速度変換器と、この加速度変換器から
出力された前記加速度に、初速度および計測までの時間
を入力して前記流体の流速を演算する流速変換器と、前
記流体の液位を測定する液体液位測定器と、この液体液
位測定器によって測定した前記液位と予め測定しておい
た水路の幅寸法とから前記水路の断面積を演算する断面
積算出器と、この断面積算出器で演算した前記断面積
と、前記流速変換器で演算した前記流速とを乗算して前
記流体の流量を算出する流量算出器と、を具備してなる
圧力式流量計。2. A first pressure measuring device installed opposite to a fluid flow direction to measure a dynamic pressure of the fluid, and a first pressure measuring device installed along the fluid flow direction to measure a static pressure of the fluid. A second pressure measuring device, an acceleration of a flow speed of the fluid is calculated from the dynamic pressure measured by the first pressure measuring device and the static pressure measured by the second pressure measuring device. An acceleration converter, a flow velocity converter for calculating the flow velocity of the fluid by inputting an initial velocity and a time until measurement to the acceleration output from the acceleration transducer, and a liquid liquid for measuring a liquid level of the fluid. A level measuring device, a cross-sectional area calculator for calculating the cross-sectional area of the water channel from the liquid level measured by the liquid level measuring device and the width dimension of the water channel previously measured, and the cross-sectional area calculator With the calculated cross-sectional area, the flow velocity converter And a flow rate calculator for multiplying the calculated flow rate by the calculated flow rate to calculate a flow rate of the fluid.
測定器または前記液体液位測定器のいずれか１つ以上を
複数個並列に設置し、これら平均値を算出して流量を演
算することを特徴とする請求項１または請求項２に記載
した圧力式流量計。3. A plurality of one or more of the first pressure measuring device, the second pressure measuring device and the liquid level measuring device are installed in parallel, and an average value thereof is calculated to calculate a flow rate. 3. The pressure type flow meter according to claim 1, wherein the pressure type flow meter is operated.
測定器または前記液体液位測定器のいずれか１つ以上に
洗浄機能を備えたことを特徴とする請求項１乃至請求項
３のいずれかに記載した圧力式流量計。4. The apparatus according to claim 1, wherein at least one of said first pressure measuring device, said second pressure measuring device and said liquid level measuring device has a cleaning function. 3. The pressure-type flowmeter according to any one of 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11068559A JP2000266576A (en) | 1999-03-15 | 1999-03-15 | Pressure type flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11068559A JP2000266576A (en) | 1999-03-15 | 1999-03-15 | Pressure type flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000266576A true JP2000266576A (en) | 2000-09-29 |
Family
ID=13377251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11068559A Pending JP2000266576A (en) | 1999-03-15 | 1999-03-15 | Pressure type flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000266576A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009288204A (en) * | 2008-06-01 | 2009-12-10 | Smd Gijutsu Kenkyusho:Kk | Apparatus for measuring average density of liquid |
-
1999
- 1999-03-15 JP JP11068559A patent/JP2000266576A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009288204A (en) * | 2008-06-01 | 2009-12-10 | Smd Gijutsu Kenkyusho:Kk | Apparatus for measuring average density of liquid |
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