US20180245594A1 - Pump system including a controller - Google Patents

Pump system including a controller Download PDF

Info

Publication number
US20180245594A1
US20180245594A1 US15/903,669 US201815903669A US2018245594A1 US 20180245594 A1 US20180245594 A1 US 20180245594A1 US 201815903669 A US201815903669 A US 201815903669A US 2018245594 A1 US2018245594 A1 US 2018245594A1
Authority
US
United States
Prior art keywords
pump
controller
vacuum pressure
liquid ring
ring pump
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
US15/903,669
Other languages
English (en)
Inventor
Joe Chabala
Greg Liddle
Vittorio A.P. Capparelli
Richard Cadotte
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.)
Gardner Denver Nash LLC
Original Assignee
Gardner Denver Nash LLC
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 Gardner Denver Nash LLC filed Critical Gardner Denver Nash LLC
Priority to US15/903,669 priority Critical patent/US20180245594A1/en
Publication of US20180245594A1 publication Critical patent/US20180245594A1/en
Assigned to GARDNER DENVER NASH LLC reassignment GARDNER DENVER NASH LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Capparelli, Vittorio A.P., CHABALA, Joe, CADOTTE, Richard, LIDDLE, Greg
Assigned to CITIBANK, N.A., AS ADMINISTRATIVE AGENT AND COLLATERAL AGENT reassignment CITIBANK, N.A., AS ADMINISTRATIVE AGENT AND COLLATERAL AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GARDNER DENVER NASH LLC, GARDNER DENVER PETROLEUM PUMPS, LLC, GARDNER DENVER THOMAS, INC., GARDNER DENVER, INC., THOMAS INDUSTRIES INC.
Assigned to INDUSTRIAL TECHNOLOGIES AND SERVICES, LLC, THOMAS INDUSTRIES INC., GARDNER DENVER THOMAS, INC., GARDNER DENVER NASH LLC reassignment INDUSTRIAL TECHNOLOGIES AND SERVICES, LLC RELEASE OF PATENT SECURITY INTEREST Assignors: CITIBANK, N.A., AS COLLATERAL AGENT
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/05—Speed
    • F04C2270/052—Speed angular
    • F04C2270/0525—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/18—Pressure
    • F04C2270/185—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/20—Flow
    • F04C2270/205—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/70—Safety, emergency conditions or requirements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids

Definitions

  • the present invention relates to liquid ring pumps, and more specifically to a control system for liquid ring pumps.
  • Liquid ring pump systems utilize a sealing liquid to form a seal within the pump.
  • the quantity of liquid in the pump can affect the operation of the pump. For example, too much liquid can result in extra work being required to produce the desired flow of compressed fluid.
  • Conventional liquid ring pump systems are manually-controlled for specific, predetermined conditions. As such, existing pump systems typically cannot adjust to different operating characteristics or dynamic process conditions.
  • the invention is directed to a pump system that includes a liquid ring pump driven by an electric motor.
  • a variable speed drive can power the motor, and sensors are positioned throughout the system to measure various parameters of the system.
  • a controller receives signals from the sensors and, in response to the signals, controls the variable speed drive and/or the flow of sealing water to the liquid ring pump, among other aspects of the pump system.
  • the method also includes maintaining a predetermined vacuum pressure in the liquid ring pump under variable vacuum flow demand within the pump system in response to the vacuum pressure signal by controlling, via instructions from the controller, a parameter of the liquid ring pump based on a comparison of the vacuum pressure signal to the predetermined vacuum pressure by the controller.
  • the invention is directed to a method of controlling a liquid ring pump in a pump system, the liquid ring pump driven by a motor controlled by a controller, includes monitoring a parameter in the liquid ring pump using a transmitter configured to transmit a signal indicative of the monitored parameter to the controller in operative communication with the liquid ring pump. The method also includes comparing the signal with a predetermined threshold in the controller. The method further includes disabling a motor start function of the motor in response to the signal indicating that the monitored parameter exceeds the predetermined threshold.
  • the invention is directed to a pump system includes a liquid ring pump configured to compress a fluid.
  • the pump system also includes a variable speed motor operatively coupled to the liquid ring pump to drive the liquid ring pump under variable vacuum flow demand within the pump system.
  • the pump system further includes a transmitter coupled to the pump system and configured to monitor a parameter of the pump system and to transmit a signal indicative of the monitored parameter.
  • the pump system also includes a controller in communication with the transmitter and the motor, the controller programmed to perform instructions to operatively control the liquid ring pump in response to the signal from the transmitter indicative of the monitored parameter.
  • FIG. 1 is a perspective view of a pump-motor assembly.
  • FIG. 2 is an exploded perspective view of the pump-motor assembly of FIG. 1 .
  • FIG. 3 is a schematic illustration of a pump system including the pump-motor assembly of FIG. 1 .
  • FIG. 1 illustrates a pump-motor assembly 100 that includes a pump in the form of a liquid ring pump 102 and a motor 104 .
  • the motor 104 is a variable frequency motor that is driven by a variable frequency drive to allow operation across a wide range of speeds.
  • the liquid ring pump 102 illustrated in FIG. 1 is a single stage liquid ring pump 102 with other constructions including multi-stage liquid ring pumps, multiple individual liquid ring pumps, or combinations of liquid ring pumps and other types of pumps.
  • pump is used herein when describing the liquid ring pump 102 , however it should be understood that the pump and the arrangements described herein are equally applicable to vacuum systems or compressor systems. As such, the system described herein should not be limited to pumps alone.
  • FIG. 2 illustrates an example of a liquid ring pump 102 in greater detail.
  • the liquid ring pump 102 includes a housing 202 , a first end cap 204 , and a second end cap 206 that cooperate to surround and substantially enclose a rotor 208 and a port member 210 .
  • the housing 202 in the illustrated construction is a hollow cylindrical member with open ends. However, other housing shapes are possible.
  • the first end cap 204 defines the inlet 106 and the outlet 108 and encloses a first end of the housing 202 .
  • the first end cap 204 defines a sealing liquid inlet 216 positioned to provide for the admission of additional or make-up sealing liquid (typically water).
  • the second end cap 206 encloses the second end of the housing 202 and is similar to the first end cap 204 but without the inlet 106 and the outlet 108 .
  • the first end cap 204 and the second end cap 206 each support bearings that in turn support the rotor 208 for rotation within the housing 202 .
  • a liquid or gas bypass passage is also provided to aid in operation at pressure ratios below the maximum pressure ratio of the pump.
  • a valve such as a solenoid operated valve is selectively opened and closed to vent either sealing liquid or gas to reduce the pressure differential in the pump, thereby reducing the work required to operate at a pressure ratio below the maximum rated pressure ratio.
  • the rotor 208 includes a plurality of vanes arranged to define compression chambers or spaces during operation.
  • the port member 210 is a conical port member 210 that is partially received within a conical opening in the rotor 208 .
  • the port member 210 includes a plurality of apertures or openings that are arranged to direct fluid into the rotor 208 and out of the rotor 208 at the desired positions and orientations.
  • liquid ring pumps there are many different arrangements of liquid ring pumps.
  • the illustrated construction is a single stage pump with a conical port member 210 .
  • Other constructions could include two or more stages or could include planar port plates.
  • the systems described herein should not be limited to use with a liquid ring pump 102 as described herein. Rather, the system is equally applicable to other systems and arrangements that include liquid ring pumps 102 .
  • the liquid ring pump 102 draws fluid to be compressed into the pump via the inlet 106 .
  • the motor 104 drives the rotor 208 to rotate the rotor 208 about an axis. Rotation of the rotor 208 produces a ring of sealing liquid that cooperates with the vanes of the rotor 208 to form a series of closed spaces.
  • the axis of the rotor 208 is offset from the center of the ring of sealing liquid such that the closed spaces reduce in volume from the inlet 106 to the outlet 108 .
  • some of the sealing liquid is typically carried with the stream of compressed fluid. Thus, additional sealing liquid must be periodically admitted into the pump via the sealing liquid inlet 216 .
  • the quantity of sealing liquid and the speed of the motor 104 are two variables that can be adjusted to achieve a desired operational characteristic.
  • FIG. 3 schematically illustrates a pump system 300 including the liquid ring pump 102 of FIG. 1 and FIG. 2 .
  • a process inlet 318 directs the fluid to be compressed to the inlet 106 of the liquid ring pump 102 .
  • a process outlet 320 takes the compressed fluid and any carryover sealing liquid from the outlet 108 of the liquid ring pump 102 and directs the compressed fluid to a moisture separator 310 .
  • the moisture separator 310 separates the compressed fluid from the sealing fluid and directs the compressed fluid out a system or gas outlet 324 .
  • the separated sealing liquid is directed along a sealing liquid outlet 322 where a sealing liquid pump 312 pumps the fluid back to the liquid ring pump 102 and into the sealing liquid inlet 216 .
  • a heat exchanger 314 is positioned between the sealing liquid pump 312 and the liquid ring pump 102 to cool the sealing liquid as may be desired.
  • a plurality of measuring instruments 326 are positioned throughout the pump system 300 and are arranged to provide measurements to a controller 316 that can be a programmable logic controller (“PLC”). Typical measurements may include the inlet fluid temperature and pressure, the outlet fluid temperature and pressure, the sealing liquid temperature, and other temperatures, pressures, fluid levels, valve positions, etc. in the pump system 300 that may be desired.
  • PLC programmable logic controller
  • Control members 302 are positioned throughout the pump system 300 to control different components and operations.
  • the control members 302 are each connected to the controller 316 to allow the controller 316 to control the respective control members 302 .
  • a valve can be positioned to open a drain connected to the sealing liquid outlet 322 .
  • Other control members 302 may include a motor controller for controlling the operation of the sealing liquid pump 312 , valve controllers for controlling the opening of a liquid or gas vent system, or other operational characteristics of the pump system 300 .
  • Another control member 302 includes the variable frequency drive (“VFD”) or other motor controller that controls the operation of the liquid ring pump 102 via the motor 104 .
  • the controller 316 is connected to each of the control members 302 , including any VFDs or motor controllers, to allow the controller 316 to control the motor(s) and pump(s).
  • the pump-motor assembly 100 operates to draw in fluid to be compressed.
  • a supply of sealing liquid, usually, water is also provided to the pump to form the liquid ring and the make-up for carry over that exits the pump with the compressed fluid.
  • the flow of compressed fluid and any carry over flows to the moisture separator 310 where the carryover is separated and redirected back to the liquid ring pump 102 for reuse.
  • the compressed fluid exits the moisture separator 310 and may pass through a filter or other conditioning devices (e.g., heat exchangers, etc.) before passing to a point of use.
  • controller 316 Various temperatures, pressures, flow rates, and the like, are measured and monitored by the controller 316 . Using this data, the controller 316 is able to control the speed of the motor 104 that drives the pump-motor assembly 100 , and together or separately, the quantity of liquid in the liquid ring pump 102 can be closely controlled to assure that the desired output pressure is achieved for the intended application.
  • the controller 316 can reduce the speed of the motor 104 and the pump 102 to reduce the volumetric flow rate.
  • the controller 316 can increase or decrease the flow of sealing water to the pump 102 .
  • the controller 316 could vent sealing liquid or gas to reduce the pressure ratio of the pump 102 as may be desired or necessary under the operating conditions present at any given time.
  • the controller 316 can be used to “lock-out” the motor start function based on a liquid level transmitter to ensure the pump 102 does not start with too much or too little liquid within the pump 102 .
  • a pressure transducer can transmit the pump backpressure to the controller 316 prior to a start to assure that the pump 102 is not started against an excessive or undesirable backpressure.
  • controller 316 can be programmed to monitor the actual wear on the bearings to determine if they need to be replaced or if other maintenance might be required. In another construction, the operating time is monitored to determine maintenance cycles and to assure common wearing parts are replaced in a timely fashion prior to failure. Recommended maintenance schedules dependent on the model and size of the pump as well as operating conditions or duty cycles could be programmed into the controller 316 to further enhance system reliability.
  • the controller 316 can also be programmed to coordinate an automated permissive start procedure. In this example, the controller 316 would check essential parameters prior to startup to ensure a start condition that is safe and that is optimal for system performance.
  • a liquid ring vacuum pump is required to maintain a specific vacuum level of 500 mbar.
  • the liquid ring vacuum pump includes a programmable logic controller, a variable frequency drive that is coupled to a motor that is driving the pump, and pressure transmitters (“PT”) to monitor the vacuum level at the inlet and discharge of the pump.
  • the pump initially operates at a speed of 1750 revolutions per minute (“RPM”) to maintain the vacuum level of 500 mbar at the pump inlet. As the vacuum demand from the process increases or decreases, the pump needs to change speed to maintain the vacuum of 500 mbar at the inlet.
  • RPM revolutions per minute
  • the inlet vacuum PT reads the vacuum level at the inlet; if the PT at the inlet reads a value less than or more than the desired vacuum, the PLC would then send a signal to the VFD to change the pump speed accordingly. The change in speed will create more or less vacuum at the inlet. The PLC will continue to modulate the speed of the pump to maintain the desired vacuum level. Limits can be written into the logic that will only allow the pump to speed up and slow down within the specified limits. The limits can be pump limits, motor limits, or other system limits.
  • Modulating the speed of the motor to maintain the desired vacuum level rather than varying other parameters, such as water quantity within the pump or varying the amount of liquid/vapor bypass, allows the pump to operate more efficiently. This provides a potential cost savings to the pump user if the motor is able to run at lower speeds and lower seal water flow rates.
  • the PLC can send a signal to one or more solenoid-operated drain valves to automatically purge the liquid ring pump to help remove possible contamination from the machine.
  • This can be on a timed schedule or can take place when the pump is experiencing higher than normal vibration or possibly a decrease in capacity—each of which can be sensed by instrumentation and provided to the PLC.
  • By automatically draining the liquid in the pump the user can lengthen the time between machine rebuilds or other costly maintenance requirements. This feature could also help users maintain higher capacity for the pump, for longer periods of time. This increases the pump efficiency over the life of the pump.
  • the PLC monitors and varies the seal water flow rate to maintain the inlet vacuum level of the pump. Varying the seal water flow rate, while running the pump at its design speed, provides the most efficient operation of the pump at various vacuum levels.
  • the pump system 300 provides a programmable platform for the pump 102 to be able to be controlled based on different operating characteristics that are specific to many different applications and installations, and give the pump 102 versatility in being controlled by several factors and interactions between operating characteristics that can change depending on the application. With the programmability of a PLC, for example, the control, monitoring, and operation of the pump system 300 can be tailored to different applications based on specific process needs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US15/903,669 2017-02-24 2018-02-23 Pump system including a controller Abandoned US20180245594A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/903,669 US20180245594A1 (en) 2017-02-24 2018-02-23 Pump system including a controller

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762463170P 2017-02-24 2017-02-24
US15/903,669 US20180245594A1 (en) 2017-02-24 2018-02-23 Pump system including a controller

Publications (1)

Publication Number Publication Date
US20180245594A1 true US20180245594A1 (en) 2018-08-30

Family

ID=61750514

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/903,669 Abandoned US20180245594A1 (en) 2017-02-24 2018-02-23 Pump system including a controller

Country Status (9)

Country Link
US (1) US20180245594A1 (fr)
EP (1) EP3586010A1 (fr)
JP (1) JP2020508413A (fr)
KR (1) KR20190116508A (fr)
CN (1) CN110418891A (fr)
AU (1) AU2018225248A1 (fr)
BR (1) BR112019017748A2 (fr)
CA (1) CA3054728A1 (fr)
WO (1) WO2018156909A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210372402A1 (en) * 2018-03-14 2021-12-02 Edwards Technologies Vacuum Engineering (Qingdao), Co Ltd A liquid ring pump manifold
US20220018353A1 (en) * 2018-10-25 2022-01-20 Edwards Technologies Vacuum Engineering (Qingdao) Co Ltd Liquid ring pump control
US11619232B2 (en) * 2018-03-14 2023-04-04 Edwards Limited Liquid ring pump control
US20230243353A1 (en) * 2020-06-26 2023-08-03 Edwards Technologies Vacuum Engineering (Qingdao) Company Limited Liquid ring pump control
US20230332601A1 (en) * 2020-08-28 2023-10-19 EdwardsTechnologies Vacuum Engineering (Qingdao) Co Ltd Control of operating liquid flow into a liquid ring pump
US12123412B2 (en) * 2020-08-28 2024-10-22 Edwards Technologies Vacuum Engineering (Qingdao) Company Limited Control of operating liquid flow into a liquid ring pump

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2571971B (en) * 2018-03-14 2020-09-23 Edwards Tech Vacuum Engineering Qingdao Co Ltd Liquid ring pump control
KR20230047773A (ko) 2021-10-01 2023-04-10 농업회사법인 가농바이오 주식회사 난백 식품 제조방법 및 그에 의하여 제조된 난백 식품
CN115095511A (zh) * 2022-06-17 2022-09-23 知脉(上海)机器人有限公司 压力泵设备、压力泵系统及压力泵的控制方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5949388A (ja) * 1982-09-13 1984-03-21 Toshiba Corp 水封式真空ポンプの運転方法および運転装置
DE3420144A1 (de) * 1984-05-30 1985-12-05 Loewe Pumpenfabrik GmbH, 2120 Lüneburg Regelungs- und steuerungssystem, insbes. fuer wassering-vakuumpumpen
DE59006448D1 (de) * 1990-11-23 1994-08-18 Siemens Ag Flüssigkeitsringpumpe.
US6558131B1 (en) * 2001-06-29 2003-05-06 nash-elmo industries, l.l.c. Liquid ring pumps with automatic control of seal liquid injection
DE102005043434A1 (de) * 2005-09-13 2007-03-15 Gardner Denver Elmo Technology Gmbh Einrichtung zur Leistungsanpassung einer Flüssigkeitsringpumpe
US20110194950A1 (en) * 2010-02-10 2011-08-11 Shenoi Ramesh B Efficiency improvements for liquid ring pumps
CN201865917U (zh) * 2010-10-26 2011-06-15 江苏双乐化工颜料有限公司 水环式真空泵的水循环装置
DK178041B1 (da) * 2014-06-25 2015-04-07 Hvidtved Larsen As J Mobil slamsuger samt fremgangsmåde
KR101675100B1 (ko) * 2014-10-28 2016-11-11 앤에스코리아주식회사 수봉식 진공펌프 운전 시스템
CN106014999B (zh) * 2016-06-09 2017-08-04 中国石油大学(华东) 一种水环真空泵机组高效运行控制方法和控制系统

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210372402A1 (en) * 2018-03-14 2021-12-02 Edwards Technologies Vacuum Engineering (Qingdao), Co Ltd A liquid ring pump manifold
US11619232B2 (en) * 2018-03-14 2023-04-04 Edwards Limited Liquid ring pump control
US20220018353A1 (en) * 2018-10-25 2022-01-20 Edwards Technologies Vacuum Engineering (Qingdao) Co Ltd Liquid ring pump control
US20230243353A1 (en) * 2020-06-26 2023-08-03 Edwards Technologies Vacuum Engineering (Qingdao) Company Limited Liquid ring pump control
US12038007B2 (en) * 2020-06-26 2024-07-16 Edwards Technologies Vacuum Engineering (Qingdao) Company Limited Liquid ring pump control
US20230332601A1 (en) * 2020-08-28 2023-10-19 EdwardsTechnologies Vacuum Engineering (Qingdao) Co Ltd Control of operating liquid flow into a liquid ring pump
US12123412B2 (en) * 2020-08-28 2024-10-22 Edwards Technologies Vacuum Engineering (Qingdao) Company Limited Control of operating liquid flow into a liquid ring pump

Also Published As

Publication number Publication date
KR20190116508A (ko) 2019-10-14
CA3054728A1 (fr) 2018-08-30
JP2020508413A (ja) 2020-03-19
BR112019017748A2 (pt) 2020-03-31
WO2018156909A1 (fr) 2018-08-30
AU2018225248A1 (en) 2019-10-17
EP3586010A1 (fr) 2020-01-01
CN110418891A (zh) 2019-11-05

Similar Documents

Publication Publication Date Title
US20180245594A1 (en) Pump system including a controller
US5318151A (en) Method and apparatus for regulating a compressor lubrication system
US11073148B2 (en) Method for controlling the outlet temperature of an oil injected compressor or vacuum pump and oil injected compressor or vacuum pump implementing such method
CN112005015B (zh) 液环泵控制
JP5518042B2 (ja) 液体注入式圧縮機要素部の冷却方法及びこのような方法が適用される液体注入式圧縮機要素部
EP3315780A1 (fr) Compresseur d'air à vis à injection d'huile
EP2181266B1 (fr) Améliorations apportées à la commande de compresseurs
EP0570114B1 (fr) Système et procédé de commande pour un moteur propulsant un compressor
US20080085207A1 (en) Oil-flooded screw compressor with axial-thrust balancing device
EP3315778B2 (fr) Compresseur d'air à vis à injection d'huile
WO2018033827A1 (fr) Procédé de commande de la température de sortie d'une pompe à vide ou d'un compresseur à injection d'huile et pompe à vide ou compresseur à injection d'huile mettant en œuvre un tel procédé
US6139280A (en) Electric switch gauge for screw compressors
KR20130018193A (ko) 압축 장치
JP7434170B2 (ja) モータの回転速度を調整する多段圧縮装置及び方法
CN112105821A (zh) 液环泵控制
CN111637056A (zh) 涡旋回转式压缩机及其控制方法、空调器
US20040112679A1 (en) System and method for lubricant flow control in a variable speed compressor package
US6296451B1 (en) Process and installation for the regulation of a central unit for the production of medical vacuum
JP2024507235A (ja) 液体リングポンプの制御
JP2023545869A (ja) 液体リングポンプへの作動液の流量の制御
EP3245403B1 (fr) Procédé pour commander la vitesse d'un compresseur/pompe à vide
Misenko Means for Improving Energy Efficiency of Pressure Systems
EP0033726A4 (fr) Pompe a anneau liquide a deux etages.
GB2442830A (en) Screw Compressor with Axial thrust Balancing Device

Legal Events

Date Code Title Description
STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

AS Assignment

Owner name: GARDNER DENVER NASH LLC, PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHABALA, JOE;LIDDLE, GREG;CAPPARELLI, VITTORIO A.P.;AND OTHERS;SIGNING DATES FROM 20170327 TO 20170329;REEL/FRAME:047642/0687

AS Assignment

Owner name: CITIBANK, N.A., AS ADMINISTRATIVE AGENT AND COLLAT

Free format text: SECURITY INTEREST;ASSIGNORS:GARDNER DENVER NASH LLC;GARDNER DENVER, INC.;GARDNER DENVER PETROLEUM PUMPS, LLC;AND OTHERS;REEL/FRAME:051460/0306

Effective date: 20200107

Owner name: CITIBANK, N.A., AS ADMINISTRATIVE AGENT AND COLLATERAL AGENT, DELAWARE

Free format text: SECURITY INTEREST;ASSIGNORS:GARDNER DENVER NASH LLC;GARDNER DENVER, INC.;GARDNER DENVER PETROLEUM PUMPS, LLC;AND OTHERS;REEL/FRAME:051460/0306

Effective date: 20200107

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: THOMAS INDUSTRIES INC., WISCONSIN

Free format text: RELEASE OF PATENT SECURITY INTEREST;ASSIGNOR:CITIBANK, N.A., AS COLLATERAL AGENT;REEL/FRAME:067401/0915

Effective date: 20240510

Owner name: GARDNER DENVER THOMAS, INC., WISCONSIN

Free format text: RELEASE OF PATENT SECURITY INTEREST;ASSIGNOR:CITIBANK, N.A., AS COLLATERAL AGENT;REEL/FRAME:067401/0915

Effective date: 20240510

Owner name: GARDNER DENVER NASH LLC, PENNSYLVANIA

Free format text: RELEASE OF PATENT SECURITY INTEREST;ASSIGNOR:CITIBANK, N.A., AS COLLATERAL AGENT;REEL/FRAME:067401/0915

Effective date: 20240510

Owner name: INDUSTRIAL TECHNOLOGIES AND SERVICES, LLC, NORTH CAROLINA

Free format text: RELEASE OF PATENT SECURITY INTEREST;ASSIGNOR:CITIBANK, N.A., AS COLLATERAL AGENT;REEL/FRAME:067401/0915

Effective date: 20240510