JP2003075213A - Measuring apparatus for flow rate of low-fluidity-liquid transport pump - Google Patents
Measuring apparatus for flow rate of low-fluidity-liquid transport pumpInfo
- Publication number
- JP2003075213A JP2003075213A JP2001268364A JP2001268364A JP2003075213A JP 2003075213 A JP2003075213 A JP 2003075213A JP 2001268364 A JP2001268364 A JP 2001268364A JP 2001268364 A JP2001268364 A JP 2001268364A JP 2003075213 A JP2003075213 A JP 2003075213A
- Authority
- JP
- Japan
- Prior art keywords
- low
- flow rate
- pump
- fluidity
- liquid transport
- 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)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、医薬、化学工業で
用いられる低流動性液、建築、土木工事における流動性
に乏しい低スランプのコンクリート、あるいは、下水処
理場、し尿処理場等で発生する低含水率の脱水汚泥等の
低流動性液を輸送するポンプの流量を測定するための流
量測定装置に関するものである。
【０００２】
【従来の技術】従来、医薬、化学工業で用いられる低流
動性液、建築、土木工事における流動性に乏しい低スラ
ンプのコンクリート、あるいは、下水処理場、し尿処理
場等で発生する低含水率の脱水汚泥等の低流動性液を輸
送する場合には、往復動ポンプや回転ポンプ等の容積式
ポンプが用いられている。しかし、このような低流動性
液を輸送する場合のポンプの流量を正確に測定できる装
置はない。
【０００３】例えば、下水処理場やし尿処理場の脱水汚
泥を容積式ポンプで輸送する場合には、脱水汚泥が低流
動性で流動抵抗が高いため、管内流速を５ｃｍ／ｓ以下
に抑えて圧送することが多い。このような低流速の範囲
では、電磁流量計を用いて測定しても、電磁流量計の精
度は流速が低くなるほど悪くなるため、正確な流量を得
ることができない。
【０００４】管内流速を２ｃｍ／ｓとした場合における
測定例では、±１２．５％も流量に誤差が生じ、高い精
度が得られなかった。さらに、脱水汚泥は、含まれるガ
ス量が場所や季節によって異なるため、流速を測定する
ことによって流量を求める電磁流量計では、精度のばら
つきが多くなる。
【０００５】
【発明が解決しようとする課題】本発明は、低流動性液
輸送ポンプの流量測定における上記問題を解決するもの
であって、低流動性液を輸送する場合に流量をより正確
に測定することのできる低流動性液輸送ポンプの流量測
定装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】本発明の低流動性液輸送
ポンプの流量測定装置は、低流動性液輸送ポンプの受入
側又は送出側で貯留される低流動性液の所定時間内の重
量変化を計測する重量計測手段と、低流動性液輸送ポン
プの作動量を計測する作動量計測手段と、重量計測手段
及び作動量計測手段の計測データに基づいて低流動性液
輸送ポンプの容積効率を求め、以後容積効率と作動量か
ら流量を算出する演算手段とを備えることにより上記課
題を解決している。
【０００７】この低流動性液輸送ポンプの流量測定装置
では、先ず、重量計測手段が低流動性液輸送ポンプの受
入側又は送出側で貯留される低流動性液の所定時間内の
重量変化を計測し、作動量計測手段がその時間内の低流
動性液輸送ポンプの作動量を計測する。なお、計測され
る低流動性液輸送ポンプの作動量は、ピストンポンプの
ような往復動ポンプであればストローク数、一軸ねじポ
ンプのような回転ポンプであれば回転数である。
【０００８】この重量計測手段と作動量計測手段の計測
データに基づいて、演算手段は低流動性液輸送ポンプの
容積効率を求める。低流動性液輸送ポンプには容積式ポ
ンプが用いられ、単位作動量当たりの理論吐出量は既知
であるので、単位作動量当たりの理論吐出量と計測され
た所定時間内の作動量との積として、所定時間内の理論
吐出量が得られる。これに対し、低流動性液の所定時間
内の実際の輸送量は、低流動性液輸送ポンプの受入側又
は送出側で貯留される低流動性液の所定時間内の重量変
化を低流動性液の比重で除した商として得られる。容積
効率はこの低流動性液の実際の輸送量と理論吐出量との
比として求められる。
【０００９】容積効率が得られた後は、演算手段が容積
効率と作動量から流量を算出する。即ち、単位作動量当
たりの理論吐出量と計測された単位時間内の作動量との
積として、単位時間内の理論吐出量を求め、この単位時
間内の理論吐出量と容積効率の積として単位時間当たり
の流量が算出される。この低流動性液輸送ポンプの流量
測定装置は、低流動性液の流速が低くなっても精度が低
下することがなく、常に正確な流量を得ることができ
る。
【００１０】
【発明の実施の形態】図１は本発明の実施の一形態であ
る低流動性液輸送ポンプの流量測定装置の構成図であ
る。ここで、低流動性液輸送ポンプ１は、低流動性液で
ある下水処理場の脱水ケーキ２を輸送するピストンポン
プであって、ポンプホッパー３に脱水ケーキ２を供給す
るためのフィーダ５を備えた受入ホッパー４と投入シュ
ート６とが設けられている。フィーダ５と投入シュート
６との間には、フレキシブルジョイント７が介設されて
いる。
【００１１】受入ホッパー４には、受入配管８から受入
れた脱水ケーキ２が貯留されており、この脱水ケーキ２
がフィーダ５から投入シュート６を経てポンプホッパー
３に投入される。ポンプホッパー３内の脱水ケーキ２は
ピストン９の往復動によって、ポンプシリンダ１０に吸
込まれた後、輸送配管１１に吐出され送出ホッパー１２
に圧送される。
【００１２】この低流動性液輸送ポンプ１の流量測定装
置として、受入ホッパー４の下部と送出ホッパー１２の
下部には、貯留される脱水ケーキ２の所定時間内の重量
変化を計測する重量計測手段であるロードセル１４、１
６が設けられており、その計測データが制御盤１７内に
設けられている演算手段１８に送られる。なお、重量計
測手段は受入ホッパー４、送出ホッパー１２の何れか一
方のみに設けるだけでよいが、両方にロードセル１４、
１６を設けておけばより正確な計測結果が得られる。
【００１３】また、低流動性液輸送ポンプ１には、ピス
トン９のストローク数を計測するための近接センサー１
９が設けられており、その計測データが制御盤１７内に
設けられている演算手段１８に送られる。演算手段１８
は、ＣＰＵとメモリを備えたマイクロプロセッサであ
り、ロードセル１４、１６、及び近接センサー１９の計
測データに基づいて低流動性液輸送ポンプ１の容積効率
を求め、以後容積効率と近接センサー１９によるピスト
ン９のストローク数の計測データから流量を算出し、表
示器２０に表示する。
【００１４】この流量測定装置で低流動性液輸送ポンプ
１の流量測定を行う場合には、まず受入配管８から受入
ホッパー４への脱水ケーキ２の供給を停止した状態で、
所定時間低流動性液輸送ポンプ１を運転し、この時間内
の受入ホッパー４内の脱水ケーキ２の重量減少、送出ホ
ッパー１２内の脱水ケーキ２の重量増加をロードセル１
４、１６で計測すると共に、低流動性液輸送ポンプ１の
ストローク数を近接センサー１９で計測する。
【００１５】演算手段１８は、ロードセル１４、１６、
及び近接センサー１９の計測データに基づいて、低流動
性液輸送ポンプ１の容積効率を求める。低流動性液輸送
ポンプ１はピストンポンプであり、ピストンの１ストロ
ーク当たりの理論吐出量は既知であるので、１ストロー
ク当たりの理論吐出量と計測された所定時間内のストロ
ーク数との積として、所定時間内の理論吐出量が得られ
る。これに対し、脱水ケーキ２の所定時間内の実際の輸
送量は、受入ホッパー４内の脱水ケーキ２の重量減少、
又は送出ホッパー１２内の脱水ケーキ２の重量増加を既
知の脱水ケーキ２の比重で除した商として得られる。容
積効率はこの脱水ケーキ２の実際の輸送量と理論吐出量
との比として求められる。
【００１６】容積効率が得られた後は、受入配管８から
受入ホッパー４への脱水ケーキ２の供給を再開して低流
動性液輸送ポンプ１は通常の運転状態に戻り、演算手段
１８が容積効率とピストン９のストローク数から流量を
算出する。即ち、１ストローク当たりの理論吐出量と、
近接センサー１９で計測された単位時間内のストローク
数との積として、単位時間内の理論吐出量を求め、この
単位時間内の理論吐出量と容積効率の積として単位時間
当たりの流量が算出される。算出された流量は表示器２
０に表示される。
【００１７】容積効率は、受入配管８から受入ホッパー
４への脱水ケーキ２の供給を定期的に停止し再演算して
更新する。この低流動性液輸送ポンプの流量測定装置
は、脱水ケーキ２の流速が低くなっても精度が低下する
ことがなく、常に正確な流量を得ることができる。
【００１８】
【発明の効果】本発明の低流動性液輸送ポンプの流量測
定装置は、低流動性液を輸送する場合に流量を正確に測
定することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to low-fluid liquids used in the pharmaceutical and chemical industries, low-slump concrete or sewage with poor fluidity in construction and civil engineering. The present invention relates to a flow rate measuring device for measuring a flow rate of a pump for transporting a low-fluidity liquid such as a dehydrated sludge having a low water content generated in a treatment plant, a human waste treatment plant, and the like. [0002] Conventionally, low-fluid liquids used in the pharmaceutical and chemical industries, low-slump concrete with poor fluidity in construction and civil engineering, or low-fluids generated in sewage treatment plants and human waste treatment plants, etc. When transporting a low-fluidity liquid such as dehydrated sludge having a water content, a positive displacement pump such as a reciprocating pump or a rotary pump is used. However, there is no device capable of accurately measuring the flow rate of a pump when transporting such a low-fluidity liquid. For example, when transporting dewatered sludge from a sewage treatment plant or human waste treatment plant by a positive displacement pump, since the dewatered sludge has low flowability and high flow resistance, the flow rate in the pipe is suppressed to 5 cm / s or less, and the pressure is reduced. Often do. In such a low flow rate range, even if measurement is performed using an electromagnetic flow meter, the accuracy of the electromagnetic flow meter decreases as the flow rate decreases, so that an accurate flow rate cannot be obtained. In a measurement example in which the flow velocity in a pipe is 2 cm / s, an error occurs in the flow rate by ± 12.5%, and high accuracy cannot be obtained. Further, since the amount of gas contained in the dewatered sludge varies depending on the place and season, the accuracy of the electromagnetic flowmeter that determines the flow rate by measuring the flow rate increases. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem in measuring the flow rate of a low-fluidity liquid transport pump, and more precisely measures the flow rate when transporting a low-fluidity liquid. An object of the present invention is to provide a flow rate measuring device of a low-fluidity liquid transport pump capable of measuring. SUMMARY OF THE INVENTION [0006] A flow rate measuring apparatus for a low-fluidity liquid transport pump according to the present invention comprises: Weight measuring means for measuring a change in the weight of the inside, an operating amount measuring means for measuring the operating amount of the low-fluid liquid transport pump, and a low-fluid liquid transport pump based on the measurement data of the weight measuring means and the operating amount measuring means. The above-mentioned problem is solved by providing a calculating means for calculating the volumetric efficiency and calculating the flow rate from the volumetric efficiency and the operation amount thereafter. In this flow rate measuring device for a low-fluidity liquid transport pump, first, the weight measuring means measures the weight change of the low-fluidity liquid stored on the receiving side or the sending-out side of the low-fluidity liquid transport pump within a predetermined time. Then, the operation amount measuring means measures the operation amount of the low-fluid liquid transport pump during the time. The amount of operation of the low-fluid liquid transport pump measured is the number of strokes for a reciprocating pump such as a piston pump, and the number of rotations for a rotary pump such as a single-shaft screw pump. Based on the measurement data of the weight measuring means and the operation amount measuring means, the calculating means obtains the volumetric efficiency of the low-fluidity liquid transport pump. A positive displacement pump is used as the low-fluid liquid transfer pump, and the theoretical discharge amount per unit operation amount is known. Therefore, the product of the theoretical discharge amount per unit operation amount and the measured operation amount within a predetermined time is used. As a result, a theoretical discharge amount within a predetermined time is obtained. On the other hand, the actual transport amount of the low-fluid liquid within a predetermined time is determined by the change in weight of the low-fluid liquid stored on the receiving side or the discharge side of the low-fluid liquid transport pump within the predetermined time. Obtained as the quotient divided by the specific gravity of the liquid. Volumetric efficiency is determined as the ratio of the actual transported amount of this low-fluidity liquid to the theoretical discharge amount. After the volumetric efficiency is obtained, the calculating means calculates the flow rate from the volumetric efficiency and the operation amount. That is, the theoretical discharge amount per unit time is obtained as the product of the theoretical discharge amount per unit operation amount and the measured operation amount per unit time, and the unit is calculated as the product of the theoretical discharge amount per unit time and the volumetric efficiency. The flow per hour is calculated. The flow rate measuring device of the low-fluidity liquid transport pump can always obtain an accurate flow rate without lowering the accuracy even if the flow rate of the low-fluidity liquid decreases. FIG. 1 is a block diagram of a flow rate measuring device of a low-fluidity liquid transport pump according to an embodiment of the present invention. Here, the low-fluid liquid transport pump 1 is a piston pump that transports the dehydrated cake 2 of the sewage treatment plant, which is a low-fluid liquid, and includes a feeder 5 for supplying the dehydrated cake 2 to the pump hopper 3. A receiving hopper 4 and a charging chute 6 are provided. A flexible joint 7 is interposed between the feeder 5 and the charging chute 6. In the receiving hopper 4, the dewatered cake 2 received from the receiving pipe 8 is stored.
Is supplied from the feeder 5 to the pump hopper 3 via the charging chute 6. The dewatered cake 2 in the pump hopper 3 is sucked into the pump cylinder 10 by the reciprocating motion of the piston 9 and then discharged to the transport pipe 11 to be discharged to the delivery hopper 12.
To be pumped. As a flow rate measuring device of the low-fluidity liquid transport pump 1, a weight measuring means for measuring a change in weight of the stored dewatered cake 2 within a predetermined time is provided at a lower portion of the receiving hopper 4 and a lower portion of the sending hopper 12. Load cell 14, 1
6 is provided, and the measurement data is sent to the calculating means 18 provided in the control panel 17. Note that the weight measuring means may be provided only in one of the receiving hopper 4 and the sending hopper 12, but the load cell 14
If 16 are provided, more accurate measurement results can be obtained. The low-fluid liquid transport pump 1 has a proximity sensor 1 for measuring the number of strokes of the piston 9.
9 is provided, and the measurement data is sent to the calculating means 18 provided in the control panel 17. Arithmetic means 18
Is a microprocessor having a CPU and a memory. The microprocessor calculates the volumetric efficiency of the low-fluid liquid transport pump 1 based on the measurement data of the load cells 14, 16 and the proximity sensor 19, and thereafter calculates the volumetric efficiency and the piston by the proximity sensor 19. The flow rate is calculated from the measurement data of the number of strokes of No. 9 and displayed on the display 20. When the flow rate of the low-fluidity liquid transport pump 1 is measured by this flow rate measuring apparatus, first, the supply of the dewatered cake 2 from the receiving pipe 8 to the receiving hopper 4 is stopped.
The low-fluid liquid transport pump 1 is operated for a predetermined time, and during this time, the weight of the dehydrated cake 2 in the receiving hopper 4 and the weight of the dehydrated cake 2 in the delivery hopper 12 are increased.
The number of strokes of the low-fluid liquid transport pump 1 is measured by the proximity sensor 19 in addition to the measurement at 4 and 16. The operation means 18 includes load cells 14, 16,
And the volumetric efficiency of the low-fluidity liquid transport pump 1 based on the measurement data of the proximity sensor 19. The low-fluid liquid transport pump 1 is a piston pump, and the theoretical discharge amount per stroke of the piston is known. Therefore, as a product of the theoretical discharge amount per stroke and the number of strokes within a predetermined time measured, The theoretical discharge amount within a predetermined time can be obtained. On the other hand, the actual transport amount of the dewatered cake 2 within a predetermined time is determined by the weight reduction of the dewatered cake 2 in the receiving hopper 4,
Alternatively, it is obtained as a quotient obtained by dividing the increase in the weight of the dewatered cake 2 in the delivery hopper 12 by the specific gravity of the known dewatered cake 2. The volumetric efficiency is obtained as a ratio between the actual transport amount of the dewatered cake 2 and the theoretical discharge amount. After the volumetric efficiency is obtained, the supply of the dewatered cake 2 from the receiving pipe 8 to the receiving hopper 4 is resumed, the low-fluid liquid transport pump 1 returns to a normal operation state, and The flow rate is calculated from the efficiency and the number of strokes of the piston 9. That is, the theoretical discharge amount per stroke,
The theoretical discharge amount per unit time is obtained as a product of the number of strokes per unit time measured by the proximity sensor 19, and the flow rate per unit time is calculated as the product of the theoretical discharge amount per unit time and the volumetric efficiency. You. The calculated flow rate is displayed on display 2
Displayed as 0. The volumetric efficiency is updated by periodically stopping the supply of the dewatered cake 2 from the receiving pipe 8 to the receiving hopper 4 and recalculating. The flow rate measuring device of this low-fluidity liquid transport pump can always obtain an accurate flow rate without lowering the accuracy even if the flow rate of the dewatered cake 2 becomes low. The flow rate measuring device of the low-fluidity liquid transport pump of the present invention can accurately measure the flow rate when transporting a low-fluidity liquid.
【図面の簡単な説明】
【図１】本発明の実施の一形態である低流動性液輸送ポ
ンプの流量測定装置の構成図である。
【符号の説明】
１ 低流動性液輸送ポンプ
２ 脱水ケーキ
３ ポンプホッパー
４ 受入ホッパー
５ フィーダ
６ 投入シュート
８ 受入配管
９ ピストン
１０ ポンプシリンダ
１１ 輸送配管
１２ 送出ホッパー
１４ ロードセル
１６ ロードセル
１７ 制御盤
１８ 演算手段
１９ 近接センサー
２０ 表示器BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a flow measuring device of a low-fluidity liquid transport pump according to an embodiment of the present invention. [Description of Signs] 1 Low-fluid liquid transport pump 2 Dehydration cake 3 Pump hopper 4 Receiving hopper 5 Feeder 6 Input chute 8 Receiving pipe 9 Piston 10 Pump cylinder 11 Transport pipe 12 Sending hopper 14 Load cell 16 Load cell 17 Control panel 18 Calculation means 19 Proximity sensor 20 Indicator
Claims (1)
側で貯留される低流動性液の所定時間内の重量変化を計
測する重量計測手段と、低流動性液輸送ポンプの作動量
を計測する作動量計測手段と、重量計測手段及び作動量
計測手段の計測データに基づいて低流動性液輸送ポンプ
の容積効率を求め、以後容積効率と作動量から流量を算
出する演算手段とを備えた低流動性液輸送ポンプの流量
測定装置。Claims: 1. A weight measuring means for measuring a change in weight of a low-fluid liquid stored on a receiving side or a discharge side of a low-fluid liquid transport pump within a predetermined time, and a low-fluid liquid. Calculates the volumetric efficiency of the low-fluid liquid transport pump based on the measurement data of the operation amount measuring means for measuring the operation amount of the transport pump, and the weight measurement means and the operation amount measurement means, and thereafter calculates the flow rate from the volumetric efficiency and the operation amount Flow measuring device for a low-fluidity liquid transport pump, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001268364A JP2003075213A (en) | 2001-09-05 | 2001-09-05 | Measuring apparatus for flow rate of low-fluidity-liquid transport pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001268364A JP2003075213A (en) | 2001-09-05 | 2001-09-05 | Measuring apparatus for flow rate of low-fluidity-liquid transport pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003075213A true JP2003075213A (en) | 2003-03-12 |
Family
ID=19094358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001268364A Pending JP2003075213A (en) | 2001-09-05 | 2001-09-05 | Measuring apparatus for flow rate of low-fluidity-liquid transport pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003075213A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008024376A (en) * | 2006-07-18 | 2008-02-07 | Heishin Engineering & Equipment Co Ltd | Liquid carrying device |
| JP2014012250A (en) * | 2012-07-04 | 2014-01-23 | Ps Mitsubishi Construction Co Ltd | Bagging and dewatering method |
| DE102017116601A1 (en) * | 2017-07-24 | 2019-01-24 | Hochland Se | Measurement of a mass flow |
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|---|---|---|---|---|
| JPS63292023A (en) * | 1987-05-26 | 1988-11-29 | Central Res Inst Of Electric Power Ind | Method for measuring flow rate of powder in lock hopper system |
| JPH06336975A (en) * | 1993-05-27 | 1994-12-06 | Taiheiyo Kiko Kk | Force-feed quantity detecting method for reciprocating positive displacement pump |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008024376A (en) * | 2006-07-18 | 2008-02-07 | Heishin Engineering & Equipment Co Ltd | Liquid carrying device |
| JP2014012250A (en) * | 2012-07-04 | 2014-01-23 | Ps Mitsubishi Construction Co Ltd | Bagging and dewatering method |
| DE102017116601A1 (en) * | 2017-07-24 | 2019-01-24 | Hochland Se | Measurement of a mass flow |
| WO2019020459A1 (en) | 2017-07-24 | 2019-01-31 | Hochland Se | Measurement of a mass flow rate |
| RU2727089C1 (en) * | 2017-07-24 | 2020-07-17 | Хохланд Се | Measurement of mass flow rate |
| JP2020527231A (en) * | 2017-07-24 | 2020-09-03 | ホーホラント ソシエタス・ヨーロピアＨｏｃｈｌａｎｄ Ｓｅ | Measurement of mass flow rate |
| US11422017B2 (en) | 2017-07-24 | 2022-08-23 | Hochland Se | Method and system for determining a mass flow rate by averaging a pump parameter |
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