US20180080442A1 - Displacement pump and control system - Google Patents

Displacement pump and control system Download PDF

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Publication number
US20180080442A1
US20180080442A1 US15/706,374 US201715706374A US2018080442A1 US 20180080442 A1 US20180080442 A1 US 20180080442A1 US 201715706374 A US201715706374 A US 201715706374A US 2018080442 A1 US2018080442 A1 US 2018080442A1
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US
United States
Prior art keywords
pump
current
programmable controller
torque
saving mode
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.)
Abandoned
Application number
US15/706,374
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English (en)
Inventor
Paul Davis
Mike Jaworsky
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.)
Wanner Engineering Inc
Original Assignee
Wanner Engineering Inc
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 Wanner Engineering Inc filed Critical Wanner Engineering Inc
Priority to US15/706,374 priority Critical patent/US20180080442A1/en
Publication of US20180080442A1 publication Critical patent/US20180080442A1/en
Assigned to WANNER ENGINEERING, INC. reassignment WANNER ENGINEERING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JAWORSKI, MICHAEL, KARN, JEF
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0207—Torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet

Definitions

  • the present invention is directed to a control system for pumps and in particular to a control system to a controller using current to maintain a constant fluid pressure.
  • Diaphragm pumps are used for a variety of purposes and applications and often require maintaining constant fluid pressure even under varying load conditions.
  • Diaphragm pumps generally include a diaphragm, a pumping chamber, and a piston acting on hydraulic fluid on a first side of the diaphragm and separated from the pumping chamber by the diaphragm.
  • the piston assembly is adapted to reciprocate and move between a first position and a second position to actuate the diaphragm.
  • the diaphragm flexes away from the pumping chamber allowing the pumping fluid to be drawn into the pumping chamber through an inlet passage.
  • the diaphragm flexes toward the pumping chamber and causes the fluid of the pumping chamber to be discharged through a discharge passage.
  • the present invention is directed to a pump system includes a positive displacement pump, such as a diaphragm pump, an electric motor directly coupled to the positive displacement pump, and a programmable controller configured to maintain a desired current to the electric motor.
  • the programmable controller is adapted to sense the current to the motor and to maintain constant current.
  • the controller may be a variable frequency drive controller. It has been found that constant current provides constant torque and constant torque achieves constant fluid discharge pressure from the pump.
  • the programmable controller utilizes an absorbed power formula to determine the correct current to achieve the necessary torque for a desired fluid discharge pressure.
  • the programmable controller includes a power saving mode with minimal current and the pump is “dead headed” with no flow. When demand resumes from the power saving mode, the programmable controller detects acceleration from the power saving mode and is operably configured to apply the desired current.
  • the system is configured for connecting to an external application solely with a current connection to the motor and a fluid connection to the pump.
  • a method for controlling the system includes programming the controller to control the system in a power saving mode with minimum current and torque with the pump having no flow. Using an absorbed power formula and setting a desired pump fluid discharge pressure, the current and torque requirements for the desired constant fluid pressure are determined. The controller then provides constant current to the motor corresponding to the torque for the desired constant fluid pressure. The controller maintains the current for the corresponding torque and fluid discharge pressure. The controller may be programmed to return the system to a power saving mode when demand ends. Moreover, as the torque automatically accelerates from the power saving mode when there is demand on the pump, the programmable controller senses the acceleration and returns to the current for the desired constant fluid discharge pressure.
  • FIG. 1 is a perspective view of a pump, motor and control system according to the principles of the present invention
  • FIG. 2 is a flow diagram for operating the system shown in FIG. 1 ;
  • FIG. 3 is a side sectional view of a diaphragm pump for the system shown in FIG. 1 ;
  • FIG. 4 is a graph of torque versus current.
  • the system ( 10 ) includes a positive displacement pump, such as a diaphragm pump ( 20 ).
  • the pump is driven by an electric motor ( 12 ).
  • An inverter ( 14 ) with a programmable logic controller ( 16 ) provides overall control of the system ( 10 ).
  • the controller ( 16 ) may be a variable frequency drive controller. It can be appreciated that the system ( 10 ) is particularly suited for providing and maintaining constant fluid pressure.
  • the components have a modular configuration and may be adapted to a larger fluid system and provides “plug and play” connections with such connections only needed for power for the motor ( 12 ) and liquid for the pump ( 20 ). Therefore, the system ( 10 ) of the present invention is easily adapted and retrofitted to existing systems. It can also be appreciated that the motor ( 12 ) may include forced cooling for advantageous operation. The system may be adapted to multiple different systems such as providing constant pressure for tools without requiring special modifications to the system receiving the pumped fluid.
  • a positive displacement fluid pump such as a hydraulically driven diaphragm pump, generally designated ( 20 ).
  • the diaphragm pump ( 20 ) is driven by a crankshaft ( 36 ) mounted in a crankcase ( 22 ).
  • the manifold ( 26 ) includes an inlet passage ( 76 ) and a discharge passage ( 74 ).
  • the manifold ( 26 ) also includes one or more inlet check valves ( 72 ) and one or more discharge check valves ( 70 ).
  • the pump ( 20 ) is a diaphragm pump and includes a diaphragm ( 46 ) mounted on a valve stem ( 44 ).
  • the diaphragm pump ( 20 ) may be a metering pump with very low flows that requires reliable precision inlet and discharge valves to achieve precise flow rates.
  • the diaphragm ( 46 ) is hydraulically driven by a plunger ( 42 ) connected to a slider ( 40 ) on connecting rod ( 38 ) to the crankshaft ( 36 ).
  • the diaphragm system includes an overfill check valve ( 48 ) and an underfill check valve ( 50 ).
  • the diaphragm ( 46 ) receives fluid in a pumping chamber ( 34 ) and the fluid is pumped while the diaphragm deflects back and forth between an extended position and a fully retracted position.
  • the manifold ( 26 ) includes separate inlet check valves ( 72 ) and discharge check valves ( 70 ).
  • the torque at the pump shaft is controlled by motor current. Absorbed power formulas are utilized to measure the torque in relation to different electric currents. It has been found that the torque is directly proportional to the discharge pressure. Therefore, as torque is also linearly proportional to current, simple and reliable control is attained by providing a constant current to the motor ( 12 ), constant discharge fluid pressure may be achieved.
  • achieving a constant discharge pressure may begin with the pump in a “dead headed” operating state. In such a mode, there is only a very small current provided and it is envisioned that the system ( 10 ) will require only 150 watts in this mode.
  • the torque required and therefore the current required is calculated.
  • the controller ( 16 ) applies the current to the motor ( 12 ) to drive the pump ( 20 ) at the desired torque to achieve the constant discharge fluid pressure.
  • the logic controller ( 16 ) then maintains the proper current to achieve the fluid pressure.
  • the programmable controller ( 16 ) again decreases the current so that a very slight trickle current is utilized.
  • the present invention utilizes direct drive of the motor ( 12 ) to the pump ( 20 ) without a gearbox. Moreover, no pressure sensors are required after initial parameters and relationships are determined. The constant fluid pressure is maintained with simple operation of the programmable logic controller ( 12 ).
  • the programmable logic controller ( 12 ) also provides for a metering/dosing control with different control software.
  • the logic controller ( 12 ) is able to operate with the pump ( 20 ) dead headed, in which there is no flow, and is able to enter the sleep or power saving mode where current is reduced to a bare minimum for energy savings.
  • the minimal torque causes an acceleration, which is automatically detected and torque is therefore again applied at the desired level by the controller ( 16 ).
  • the controller ( 16 ) generally utilizes an absorbed power formula to set and maintain the motor ( 12 ) to drive the pump ( 20 ) to achieve the desired flow rate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Electric Motors In General (AREA)
US15/706,374 2016-09-16 2017-09-15 Displacement pump and control system Abandoned US20180080442A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/706,374 US20180080442A1 (en) 2016-09-16 2017-09-15 Displacement pump and control system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662395568P 2016-09-16 2016-09-16
US15/706,374 US20180080442A1 (en) 2016-09-16 2017-09-15 Displacement pump and control system

Publications (1)

Publication Number Publication Date
US20180080442A1 true US20180080442A1 (en) 2018-03-22

Family

ID=60990826

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/706,374 Abandoned US20180080442A1 (en) 2016-09-16 2017-09-15 Displacement pump and control system

Country Status (7)

Country Link
US (1) US20180080442A1 (zh)
EP (1) EP3513073A2 (zh)
KR (1) KR20200019590A (zh)
CN (1) CN111279077A (zh)
CA (1) CA3040627A1 (zh)
RU (1) RU2019111251A (zh)
WO (1) WO2018051192A2 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11767840B2 (en) 2021-01-25 2023-09-26 Ingersoll-Rand Industrial U.S. Diaphragm pump
ES2957894A1 (es) * 2022-06-24 2024-01-29 Metronics Tech S L Sistema intensificador de presion de bombeo

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112727722A (zh) * 2020-12-30 2021-04-30 中国航空工业集团公司金城南京机电液压工程研究中心 一种电控式恒压变量电动泵
CN112901438A (zh) * 2020-12-30 2021-06-04 中国航空工业集团公司金城南京机电液压工程研究中心 一种电控式恒功率电动泵
CN116066349B (zh) * 2023-02-27 2023-12-19 华能山东石岛湾核电有限公司 一种循环型隔膜压缩机的性能试验方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020190687A1 (en) * 2001-06-18 2002-12-19 Smart Marine Systems, Llc Marine macerator pump control module
US6577089B1 (en) * 1998-10-28 2003-06-10 Aspen Motion Technologies, Inc. Pressure control system using input current sensing
US20060192822A1 (en) * 2005-01-26 2006-08-31 Seiko Epson Corporation Liquid ejection apparatus and method for controlling liquid ejection apparatus
US20090039808A1 (en) * 2007-08-10 2009-02-12 Sanyo Electric Co., Ltd. Motor Control Device And Compressor
US20090087319A1 (en) * 2007-09-27 2009-04-02 Liquidynamics, Inc. Pump system including a variable frequency drive controller
US20110313238A1 (en) * 2010-06-22 2011-12-22 Reichenbach Steven H Fluid delivery system and method for monitoring fluid delivery system
US20130101439A1 (en) * 2010-03-24 2013-04-25 Thomas Freudenberger Method for Controlling and/or Regulating a Metering Pump
US8441222B2 (en) * 2009-07-15 2013-05-14 Integrated Designs, L.P. System and method for determining pump pressure based on motor current

Family Cites Families (5)

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AU2010201599B2 (en) * 2009-04-21 2014-06-05 Itt Manufacturing Enterprises, Inc. Pump controller
JP5845192B2 (ja) * 2010-01-11 2016-01-20 イナジー・オートモーティブ・システムズ・リサーチ・（ソシエテ・アノニム） Ｓｃｒシステムのポンプを制御するための方法
KR101238946B1 (ko) * 2011-03-18 2013-03-04 엘에스산전 주식회사 펌프 시스템 및 그 운전 방법
KR20160082519A (ko) * 2013-10-31 2016-07-08 워너 엔지니어링 인코포레이티드 다이어프램 카트리지 및 이를 구비하는 펌프
EP2995816B1 (de) * 2014-09-10 2020-04-22 maxon international ag Verfahren zur überwachung und regelung eines elektromotors zum antrieb einer pumpe

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6577089B1 (en) * 1998-10-28 2003-06-10 Aspen Motion Technologies, Inc. Pressure control system using input current sensing
US20020190687A1 (en) * 2001-06-18 2002-12-19 Smart Marine Systems, Llc Marine macerator pump control module
US20060192822A1 (en) * 2005-01-26 2006-08-31 Seiko Epson Corporation Liquid ejection apparatus and method for controlling liquid ejection apparatus
US20090039808A1 (en) * 2007-08-10 2009-02-12 Sanyo Electric Co., Ltd. Motor Control Device And Compressor
US20090087319A1 (en) * 2007-09-27 2009-04-02 Liquidynamics, Inc. Pump system including a variable frequency drive controller
US8441222B2 (en) * 2009-07-15 2013-05-14 Integrated Designs, L.P. System and method for determining pump pressure based on motor current
US20130101439A1 (en) * 2010-03-24 2013-04-25 Thomas Freudenberger Method for Controlling and/or Regulating a Metering Pump
US20110313238A1 (en) * 2010-06-22 2011-12-22 Reichenbach Steven H Fluid delivery system and method for monitoring fluid delivery system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11767840B2 (en) 2021-01-25 2023-09-26 Ingersoll-Rand Industrial U.S. Diaphragm pump
ES2957894A1 (es) * 2022-06-24 2024-01-29 Metronics Tech S L Sistema intensificador de presion de bombeo

Also Published As

Publication number Publication date
EP3513073A2 (en) 2019-07-24
CA3040627A1 (en) 2018-03-22
WO2018051192A4 (en) 2018-06-21
RU2019111251A (ru) 2020-10-16
WO2018051192A2 (en) 2018-03-22
WO2018051192A3 (en) 2018-04-26
CN111279077A (zh) 2020-06-12
KR20200019590A (ko) 2020-02-24

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