JPH07259786A - Operation method for pump - Google Patents

Operation method for pump

Info

Publication number
JPH07259786A
JPH07259786A JP5189694A JP5189694A JPH07259786A JP H07259786 A JPH07259786 A JP H07259786A JP 5189694 A JP5189694 A JP 5189694A JP 5189694 A JP5189694 A JP 5189694A JP H07259786 A JPH07259786 A JP H07259786A
Authority
JP
Japan
Prior art keywords
water level
pump
pressure
detected
electric signal
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
Application number
JP5189694A
Other languages
Japanese (ja)
Inventor
Akio Sato
明夫 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP5189694A priority Critical patent/JPH07259786A/en
Publication of JPH07259786A publication Critical patent/JPH07259786A/en
Pending legal-status Critical Current

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  • Measuring Fluid Pressure (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

PURPOSE:To improve reliability, to simplify, and to reduce a cost by a method wherein the starting timing of a pump is constantly properly detected and the use of a water level detecting means is eliminated. CONSTITUTION:A pressure in a position situated upper stream from the location position of a delivery valve 7 in a delivery pipe 6 is detected by a pressure sensor 12 and after a detected pressure is converted into an electric signal by a pressure converter 13, the signal is inputted to a comparing circuit 9A. Meanwhile, a pressure in the delivery pipe 6 when a water level in a suction water well 1 attains a pumping-up starting water level WL is converted into an electric signal value, which forms a set value. The set value is previously inputted from a setter 9B to a comparing circuit 9A. An electric signal value inputted from the pressure converter 13 is compared with a set value inputted from the setter 9B by the comparing circuit 9A. At a point of time when an electric signal value inputted from the pressure converter 13 attains a value equal to a set value, namely, at a point of time when a water level in the water suction well 1 attains the pumping-up starting water level WL, a starting signal is outputted to a primer mover 2 for driving a pump or a clutch 10 to start the pump.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、吸水井などの水槽に設
置されるポンプの運転方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a pump installed in a water tank such as an intake well.

【0002】[0002]

【従来の技術】一般に、図2に示す吸水井1に設置され
るポンプPは、ポンプ駆動用原動機2によって回転駆動
される主軸3と、この主軸3に固着されて羽根車室4内
で回転する羽根車5と、羽根車室4の出口に接続された
吐出管6を備え、この吐出管6に吐出弁7を介設した構
造になっている。そして、吸水井1の水位は水位計など
の水位検出手段8によって検出し、この検出水位信号を
制御手段9に入力するように構成されている。したがっ
て、吸水井1の水位が揚水開始水位WLまで上昇した状
態は水位検出手段8によって検出され、検出された水位
信号が制御手段9に入力される。制御手段9では、入力
された水位信号値と予め入力されている起動水位信号値
とを比較して、入力された水位信号値が起動水位信号値
に等しい値になった時点で、ポンプ駆動用原動機2もし
くは該ポンプ駆動用原動機2の出力軸2Aと主軸3の間
に介設されているクラッチ10に起動信号を出力して、
ポンプPを起動させるようにしている。
2. Description of the Related Art Generally, a pump P installed in a water intake well 1 shown in FIG. 2 has a main shaft 3 that is rotationally driven by a prime mover 2 for driving a pump and a main shaft 3 that is fixed to the main shaft 3 and rotates in an impeller chamber 4. It has an impeller 5 and a discharge pipe 6 connected to the outlet of the impeller chamber 4, and a discharge valve 7 is provided in the discharge pipe 6. The water level of the water intake well 1 is detected by the water level detecting means 8 such as a water level gauge, and the detected water level signal is input to the control means 9. Therefore, the state where the water level of the water intake well 1 has risen to the pumping start water level WL is detected by the water level detection means 8, and the detected water level signal is input to the control means 9. The control means 9 compares the input water level signal value with the previously input starting water level signal value, and when the input water level signal value becomes equal to the starting water level signal value, the pump drive A start signal is output to a clutch 10 provided between the prime mover 2 or an output shaft 2A of the prime mover 2 for driving the pump and the main shaft 3,
The pump P is started.

【0003】しかし、前記従来の運転方法では、水位検
出手段8による吸水井1の水位検出に基づいてポンプP
の起動が制御されるので、吸水井1の水位が揚水開始水
位WLまで上昇しているのにもかかわらず、吸水井1中
の異物が水位検出手段8に干渉することにより誤動作を
生じて、揚水開始水位WLの検出が妨げられたり、水面
の波立ちによって揚水開始水位WLの検出が妨げられる
おそれを有している。したがって、ポンプPの起動タイ
ミングを常時適正に検出することが期待できないため、
信頼性が低い欠点を有している。しかも、水位検出手段
8を必要とするので、設備のコストアップにつながる難
点もある。
However, in the above-mentioned conventional operation method, the pump P is detected based on the detection of the water level of the water intake well 1 by the water level detection means 8.
Since the start-up of the water intake well 1 is controlled, the foreign matter in the water intake well 1 interferes with the water level detecting means 8 to cause a malfunction even though the water level of the water intake well 1 has risen to the pumping start water level WL. There is a risk that the detection of the pumping start water level WL may be hindered, or that the wavy surface may hinder the detection of the pumping start water level WL. Therefore, it cannot be expected that the startup timing of the pump P is always properly detected.
It has a drawback of low reliability. Moreover, since the water level detecting means 8 is required, there is a problem that the cost of the equipment is increased.

【0004】[0004]

【発明が解決しようとする課題】解決しようとする問題
点は、従来のポンプの運転方法では、水位検出手段によ
る吸水井の水位検出に基づいてポンプの起動が制御され
るので、吸水井の水位が揚水開始水位まで上昇している
のにもかかわらず、吸水井中の異物が水位検出手段に干
渉することにより誤動作を生じて、揚水開始水位の検出
が妨げられたり、水面の波立ちによって揚水開始水位の
検出が妨げられるおそれを有している。したがって、ポ
ンプの起動タイミングを常時適正に検出することが期待
できないので信頼性に劣る点と、水位検出手段を必要と
するので、設備のコストアップにつながるなどの点であ
る。
The problem to be solved by the present invention is that in the conventional pump operating method, the pump startup is controlled based on the detection of the water level of the water intake well by the water level detection means, so the water level of the water intake well is controlled. Although the water level has risen to the pumping start water level, foreign matter in the water intake well interferes with the water level detection means, causing malfunction, and detection of the pumping start water level is hindered, or water level ripples cause the pumping start water level to rise. May be hindered from being detected. Therefore, it is not possible to expect the pump start timing to be detected properly all the time, which is unreliable, and the water level detection means is required, which leads to an increase in equipment cost.

【0005】[0005]

【課題を解決するための手段】本発明は、吸水井に設置
したポンプの羽根車を収容している羽根車室の出口に吐
出管が接続され、この吐出管に吐出弁を介設したポンプ
において、該吐出弁の弁閉状態で吸水井の水位変化に伴
って変化する吐出管内の圧力を圧力検出手段により検出
して制御手段に入力し、吸水井の水位が揚水開始水位に
到達した時に制御手段に入力される検出圧力信号の値に
基づいて、該制御手段からポンプ駆動用原動機もしくは
該ポンプ駆動用原動機の出力軸とポンプ主軸の間に介設
されているクラッチに起動信号を出力して、ポンプを起
動させるようにしていることを特徴とし、ポンプの起動
タイミングを常時適正に検出して、信頼性を高めるとと
もに、水位検出手段の使用を省略することにより、設備
を簡素化しかつコストを低減する目的を達成した。
According to the present invention, a discharge pipe is connected to an outlet of an impeller chamber containing an impeller of a pump installed in a suction well, and a pump having a discharge valve provided in the discharge pipe is provided. In, in the closed state of the discharge valve, the pressure in the discharge pipe that changes with the water level change of the suction well is detected by the pressure detection means and input to the control means, and when the water level of the suction well reaches the pumping start water level. Based on the value of the detected pressure signal input to the control means, the control means outputs a start signal to the pump driving prime mover or a clutch provided between the output shaft of the pump driving prime mover and the pump main shaft. In this way, the pump is activated to detect the pump's activation timing at all times to improve reliability and simplify the equipment by eliminating the use of water level detection means. To achieve the purpose of reducing the door.

【0006】[0006]

【作用】本発明によれば、吐出弁の弁閉状態で吸水井の
水位が上昇するのに応じて、吐出管内の圧力が高くな
る。この吐出管内の圧力は圧力検出手段により検出さ
れ、検出した圧力信号が制御手段に入力される。吸水井
の水位が揚水開始水位まで上昇することにより、圧力信
号の値が所定値になった時点で制御手段からポンプ駆動
用原動機もしくは該ポンプ駆動用原動機の出力軸とポン
プ主軸の間に介設されているクラッチに起動信号を出力
してポンプを起動させる。
According to the present invention, the pressure in the discharge pipe increases as the water level in the suction well rises when the discharge valve is closed. The pressure in the discharge pipe is detected by the pressure detection means, and the detected pressure signal is input to the control means. When the water level in the intake well rises to the pumping start water level and the pressure signal reaches a predetermined value, the control means intervenes between the pump driving prime mover or the output shaft of the pump driving prime mover and the pump main shaft. The start signal is output to the engaged clutch to start the pump.

【0007】[0007]

【実施例】以下、本発明の実施例を図面に基づいて説明
する。なお、前記従来例と同一もしくは相当部分には同
一符号を付して説明する。図1は本発明を適用した立軸
ポンプの概略構成図を示し、ポンプPは、主軸3、この
主軸3に固着された羽根車5、羽根車5を回転自在に収
容している羽根車室(ケーシング)4、羽根車室4の入
口に接続した吸込ベルマウス11および羽根車室4の出
口に接続した吐出管(揚水管)6を備えて吸水井1に設
置される。吐出管6には吐出弁7が介設されており、主
軸3の上端部はクラッチ10を介してモータもしくはデ
ィーゼルエンジンによってなるポンプ駆動用原動機2に
連結されいる。このポンプ駆動用原動機2によって主軸
3および羽根車5が回転駆動される。
Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the same or corresponding portions as those in the conventional example will be described by attaching the same reference numerals. FIG. 1 is a schematic configuration diagram of a vertical shaft pump to which the present invention is applied. The pump P includes a main shaft 3, an impeller 5 fixed to the main shaft 3, and an impeller chamber rotatably accommodating the impeller 5 ( The suction well 1 is provided with a casing 4), a suction bell mouth 11 connected to the inlet of the impeller chamber 4, and a discharge pipe (pumping pipe) 6 connected to the outlet of the impeller chamber 4. A discharge valve 7 is provided in the discharge pipe 6, and an upper end portion of the main shaft 3 is connected via a clutch 10 to a pump driving prime mover 2 including a motor or a diesel engine. The main shaft 3 and the impeller 5 are rotationally driven by the pump driving prime mover 2.

【0008】圧力センサ12により、吐出管6における
吐出弁7の介設位置より上流側の圧力が検出される。検
出された圧力は圧力変換器13により電気信号に変換さ
れて比較回路9Aに入力される。比較回路9Aには、設
定器9Bから設定値が予め入力される。この設定値は吸
水井1の水位が揚水開始水位WLに到達した場合におけ
る吐出管6内の圧力を電気信号に変換した値に相当して
いる。比較回路9Aでは圧力変換器13から入力された
電気信号の値と設定器9Bから入力されている設定値と
を比較し、圧力変換器13から入力された電気信号の値
が設定値と等しくなった時点で、でポンプ駆動用原動機
2もしくはクラッチ10に起動信号を出力して、ポンプ
Pを起動させるとともに、排気管14に介設した排気弁
15に弁開信号を出力して、吐出管6内の空気を排出で
きるようにしている。前記比較回路9Aおよび設定器9
Bは制御手段9に組込まれている。
The pressure sensor 12 detects the pressure upstream of the position of the discharge valve 7 in the discharge pipe 6. The detected pressure is converted into an electric signal by the pressure converter 13 and input to the comparison circuit 9A. The set value is input in advance from the setter 9B to the comparison circuit 9A. This set value corresponds to a value obtained by converting the pressure in the discharge pipe 6 into an electric signal when the water level of the suction well 1 reaches the pumping start water level WL. The comparator circuit 9A compares the value of the electric signal input from the pressure converter 13 with the set value input from the setter 9B, and the value of the electric signal input from the pressure converter 13 becomes equal to the set value. At that time, a start signal is output to the pump driving prime mover 2 or the clutch 10 to start the pump P, and a valve open signal is output to the exhaust valve 15 provided in the exhaust pipe 14 to discharge the discharge pipe 6 The inside air can be discharged. The comparison circuit 9A and the setting device 9
B is incorporated in the control means 9.

【0009】つぎに前記構成の作動について説明する。
吐出弁7の弁閉状態で吸水井1の水位が上昇するのに伴
って吐出管6内の圧力は高くなる。この吐出管6内の圧
力は圧力検出手段12により検出され、検出した圧力信
号が制御手段9に入力される。つまり、圧力センサ12
によって検出された吐出管6内の圧力は、圧力変換器1
3により電気信号に変換されて比較回路9Aに入力され
る。比較回路9Aでは圧力変換器13から入力された電
気信号の値と設定器9Bから入力されている設定値とを
比較する。吸水井1の水位が揚水開始水位WL未満であ
れば、圧力変換器13から入力された電気信号の値は設
定器9Bから入力されている設定値よりも小さいので、
比較回路9Aからポンプ駆動用原動機2もしくはクラッ
チ10に起動信号が出力されることはない。したがっ
て、ポンプPは停止状態に保持される。
Next, the operation of the above configuration will be described.
With the discharge valve 7 closed, the pressure in the discharge pipe 6 increases as the water level in the suction well 1 rises. The pressure in the discharge pipe 6 is detected by the pressure detection means 12, and the detected pressure signal is input to the control means 9. That is, the pressure sensor 12
The pressure in the discharge pipe 6 detected by the pressure converter 1 is
It is converted into an electric signal by 3 and input to the comparison circuit 9A. The comparison circuit 9A compares the value of the electric signal input from the pressure converter 13 with the set value input from the setter 9B. If the water level of the water intake well 1 is less than the pumping start water level WL, the value of the electric signal input from the pressure converter 13 is smaller than the set value input from the setter 9B.
No activation signal is output from the comparison circuit 9A to the pump driving prime mover 2 or the clutch 10. Therefore, the pump P is held in a stopped state.

【0010】一方、吸水井1の水位が揚水開始水位WL
まで上昇すると、吐出管6内の圧力はさらに高くなる。
この吐出管6内の圧力は圧力検出手段12により検出さ
れ、検出した圧力信号が制御手段9に入力される。つま
り、前述と同様に圧力センサ12によって検出された吐
出管6内の圧力は、圧力変換器13により電気信号に変
換されて比較回路9Aに入力される。比較回路9Aでは
圧力変換器13から入力された電気信号の値と設定器9
Bから入力されている設定値とを比較する。吸水井1の
水位が揚水開始水位WLに到達しているので、圧力変換
器13から入力された電気信号の値が設定器9Bから入
力されている設定値に等しくなる。したがって、比較回
路9Aからポンプ駆動用原動機2もしくはクラッチ10
に起動信号が出力されてポンプPを起動させるととも
に、排気管14に介設した排気弁15に弁開信号が出力
されて吐出管6内の空気を排出する。これにより揚水が
開始される。所定時間経過後に吐出弁7を弁開させると
ともに、排気弁15に弁閉信号を出力して排気管14を
閉塞することにより排水運転を実行することができる。
On the other hand, the water level of the suction well 1 is the pumping start water level WL.
The pressure in the discharge pipe 6 becomes even higher when the temperature rises up to.
The pressure in the discharge pipe 6 is detected by the pressure detection means 12, and the detected pressure signal is input to the control means 9. That is, similarly to the above, the pressure in the discharge pipe 6 detected by the pressure sensor 12 is converted into an electric signal by the pressure converter 13 and input to the comparison circuit 9A. In the comparison circuit 9A, the value of the electric signal input from the pressure converter 13 and the setting device 9
The set value input from B is compared. Since the water level of the water intake well 1 has reached the pumping start water level WL, the value of the electric signal input from the pressure converter 13 becomes equal to the set value input from the setter 9B. Therefore, from the comparison circuit 9A to the pump driving prime mover 2 or the clutch 10
A start signal is output to start the pump P, and a valve open signal is output to the exhaust valve 15 provided in the exhaust pipe 14 to discharge the air in the discharge pipe 6. This starts pumping. After the elapse of a predetermined time, the discharge valve 7 is opened, and a drain signal is output to the exhaust valve 15 to close the exhaust pipe 14, whereby the drainage operation can be executed.

【0011】このように、圧力センサ12による吐出管
6内の圧力検出に基づいてポンプPの起動を制御するよ
うにしているので、従来のように、吸水井1の水位が揚
水開始水位WLまで上昇しているのにもかかわらず、吸
水井1中の異物が水位検出手段8に干渉することにより
誤動作を生じて、揚水開始水位WLの検出が妨げられた
り、水面の波立ちによって揚水開始水位WLの検出が妨
げられるおそれはなくなる。したがって、吸水井1の水
位が揚水開始水位WLまで上昇したポンプPの起動タイ
ミングを常時適正に検出することが期待できる。その結
果、信頼性が高くなるとともに、水位検出手段の使用省
略により設備を簡素化して、コストを低減することが可
能になる。
As described above, since the starting of the pump P is controlled based on the pressure detection in the discharge pipe 6 by the pressure sensor 12, the water level in the water intake well 1 is up to the pumping start water level WL as in the conventional case. Despite the rise, foreign matter in the water intake well 1 interferes with the water level detection means 8 to cause a malfunction, which hinders detection of the pumping start water level WL or waviness on the water surface causes the pumping start water level WL to rise. There is no risk that detection of will be hindered. Therefore, it can be expected that the start timing of the pump P at which the water level of the suction well 1 rises to the pumping start water level WL can always be detected properly. As a result, the reliability is enhanced, and the equipment can be simplified by omitting the use of the water level detecting means, and the cost can be reduced.

【0012】なお、本発明は、前記実施例で述べた立軸
ポンプ1のみに限らず、横軸ポンプなどの他のポンプに
も採用できることはいうまでもない。
It is needless to say that the present invention can be applied not only to the vertical shaft pump 1 described in the above embodiment but also to other pumps such as a horizontal shaft pump.

【0013】[0013]

【発明の効果】以上説明したように本発明は、圧力検出
手段による吐出管内の圧力検出に基づいてポンプの起動
を制御するようにしているので、従来のように、吸水井
の水位が揚水開始水位まで上昇しているのにもかかわら
ず、吸水井中の異物が水位検出手段に干渉することによ
り誤動作を生じて、揚水開始水位の検出が妨げられた
り、水面の波立ちによって揚水開始水位の検出が妨げら
れるおそれはなくなる。したがって、吸水井の水位が揚
水開始水位まで上昇したポンプの起動タイミングを常時
適正に検出することが期待できる。その結果、信頼性が
高くなるとともに、水位検出手段の使用省略により設備
を簡素化して、コストを低減することが可能になる。
As described above, according to the present invention, the start of the pump is controlled on the basis of the pressure detection in the discharge pipe by the pressure detection means. Therefore, as in the conventional case, the water level in the suction well starts to be pumped. Even though the water level has risen to the water level, foreign matter in the intake well interferes with the water level detection means, causing malfunction, which hinders the detection of the pumping start water level, and the ripples on the water surface prevent the detection of the pumping start water level. There is no danger of being hindered. Therefore, it can be expected that the start timing of the pump when the water level of the intake well rises to the pumping start water level can always be properly detected. As a result, the reliability is enhanced, and the equipment can be simplified by omitting the use of the water level detecting means, and the cost can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を適用した立軸ポンプの概略
構成図である。
FIG. 1 is a schematic configuration diagram of a vertical shaft pump to which an embodiment of the present invention is applied.

【図2】従来例を適用した立軸ポンプの概略構成図であ
る。
FIG. 2 is a schematic configuration diagram of a vertical shaft pump to which a conventional example is applied.

【符号の説明】[Explanation of symbols]

1 吸水井 2 ポンプ駆動用原動機 3 主軸 4 羽根車室 5 羽根車 6 吐出管 7 吐出弁 9 制御手段 10 クラッチ 12 圧力センサ(圧力検出手段) WL 揚水開始水位 1 Water absorption well 2 Pump driving prime mover 3 Main shaft 4 Impeller chamber 5 Impeller 6 Discharge pipe 7 Discharge valve 9 Control means 10 Clutch 12 Pressure sensor (pressure detection means) WL Pumping start water level

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 吸水井に設置したポンプの羽根車を収容
している羽根車室の出口に吐出管が接続され、この吐出
管に吐出弁を介設したポンプにおいて、該吐出弁の弁閉
状態で吸水井の水位変化に伴って変化する吐出管内の圧
力を圧力検出手段により検出して制御手段に入力し、吸
水井の水位が揚水開始水位に到達した時に制御手段に入
力される検出圧力信号の値に基づいて、該制御手段から
ポンプ駆動用原動機もしくは該ポンプ駆動用原動機の出
力軸とポンプ主軸の間に介設されているクラッチに起動
信号を出力して、ポンプを起動させるようにしているこ
とを特徴とするポンプの運転方法。
1. A pump in which a discharge pipe is connected to an outlet of an impeller chamber containing an impeller of a pump installed in a water intake well, and a discharge valve is provided in the discharge pipe, and the discharge valve is closed. The pressure in the discharge pipe that changes with the water level of the suction well in the state is detected by the pressure detection means and input to the control means, and the detected pressure input to the control means when the water level of the suction well reaches the pumping start water level. Based on the value of the signal, the control means outputs a start signal to the pump driving prime mover or a clutch interposed between the output shaft of the pump driving prime mover and the pump main shaft to start the pump. A method of operating a pump, which is characterized in that
JP5189694A 1994-03-23 1994-03-23 Operation method for pump Pending JPH07259786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5189694A JPH07259786A (en) 1994-03-23 1994-03-23 Operation method for pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5189694A JPH07259786A (en) 1994-03-23 1994-03-23 Operation method for pump

Publications (1)

Publication Number Publication Date
JPH07259786A true JPH07259786A (en) 1995-10-09

Family

ID=12899647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5189694A Pending JPH07259786A (en) 1994-03-23 1994-03-23 Operation method for pump

Country Status (1)

Country Link
JP (1) JPH07259786A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010249791A (en) * 2009-04-20 2010-11-04 Nishigi Keisoku Consultant:Kk Bourdon tube pressure gage
WO2014034986A1 (en) * 2012-08-31 2014-03-06 제이엠모터스 주식회사 Pumping device
JP2017524084A (en) * 2014-07-28 2017-08-24 ケヴィン エップKevin Epp System and method for effective use of low yield wells
CN108374791A (en) * 2018-02-09 2018-08-07 江门市锐驱电子科技有限公司 A kind of diving method for controlling pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010249791A (en) * 2009-04-20 2010-11-04 Nishigi Keisoku Consultant:Kk Bourdon tube pressure gage
WO2014034986A1 (en) * 2012-08-31 2014-03-06 제이엠모터스 주식회사 Pumping device
KR101476798B1 (en) * 2012-08-31 2014-12-26 제이엠모터스 주식회사 Pumping device
JP2017524084A (en) * 2014-07-28 2017-08-24 ケヴィン エップKevin Epp System and method for effective use of low yield wells
US10508420B2 (en) 2014-07-28 2019-12-17 Kevin Epp System and method for effective use of a low-yield well
CN108374791A (en) * 2018-02-09 2018-08-07 江门市锐驱电子科技有限公司 A kind of diving method for controlling pump

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