EP3368769A1 - Dispositif de commande de pompe à solénoïde - Google Patents

Dispositif de commande de pompe à solénoïde

Info

Publication number
EP3368769A1
EP3368769A1 EP16791063.7A EP16791063A EP3368769A1 EP 3368769 A1 EP3368769 A1 EP 3368769A1 EP 16791063 A EP16791063 A EP 16791063A EP 3368769 A1 EP3368769 A1 EP 3368769A1
Authority
EP
European Patent Office
Prior art keywords
voltage
driving voltage
driving
solenoid
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.)
Granted
Application number
EP16791063.7A
Other languages
German (de)
English (en)
Other versions
EP3368769B1 (fr
Inventor
Gary HAFFENDEN
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.)
Aspen Pumps Ltd
Original Assignee
Aspen Pumps Ltd
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 Aspen Pumps Ltd filed Critical Aspen Pumps Ltd
Publication of EP3368769A1 publication Critical patent/EP3368769A1/fr
Application granted granted Critical
Publication of EP3368769B1 publication Critical patent/EP3368769B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • 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
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • 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
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
    • 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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • 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
    • F04B2203/04—Motor parameters of linear electric motors
    • F04B2203/0402—Voltage
    • 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
    • F04B2203/04—Motor parameters of linear electric motors
    • F04B2203/0404—Frequency of the electric current

Definitions

  • This invention relates to a method and apparatus for driving an electromagnetic pump.
  • Figure 1 is a sectional view of a known construction of an electromagnetic (or solenoid) pump, for example as shown in US 9,028,227.
  • the pump is configured to pump fluid, such as water, from an input connection 1 to an output connection 2 in the direction of the arrow A.
  • the input connection 1 is formed as a plastics moulding, which defines a chamber in which is received a power spring 3 and a shuttle 4.
  • An electrical solenoid 5 surrounds the chamber.
  • An outer magnetic core 6 surrounds the solenoid 5.
  • a non- magnetic spacer 7 breaks the magnetic circuit of the outer magnetic core 6.
  • the shuttle 4 is made of stainless steel and is therefore moveable magnetically by the solenoid 5.
  • the shuttle 4 provides a core and a piston.
  • the core is received within the chamber and engages the power spring 3 at its proximal end.
  • the piston extends from the core and is received within a cylinder 8.
  • the shuttle 4 is hollow and provides a fluid passage through the core and the piston. The fluid passage is closed at the distal end of the piston by a piston non-return valve 9, which is retained in position by a spring within the fluid passage.
  • a retaining washer 10 locates the piston within the cylinder 8 and a sealing O-ring 11 seals the proximal end of the cylinder 8.
  • a non-return valve 12 is provided between the cylinder 8 and the output connection 2 to seal the distal end of the cylinder 8.
  • a secondary spring 13 is provided between the core and the distal wall of the chamber to cushion movement of the shuttle 4.
  • the solenoid 5 is energised electrically, which moves the core (and thus the entire shuttle 4) towards the input connection 1 , compressing the power spring 3.
  • the shuttle 4 is moved up to and between the gap created in the outer magnetic core 6 by the non-magnetic spacer 7.
  • the movement of the shuttle 4 reduces the pressure within the cylinder 8, which is closed by the non-return valve 12.
  • the reduced pressure in the cylinder 8 opens the piston non-return valve 9, which allows fluid to pass from the input connection 1 through the chamber and the fluid passage within the shuttle 4 into the cylinder 8.
  • the power spring 3 pushes the core (and thus the entire shuttle 4) towards the output connection 1.
  • the piston non-return valve 9 closes against the pressure of the fluid in the cylinder 8 and this pressure causes the non-return valve 12 to open so that the piston forces the fluid out of the cylinder 8 through the output connection 2 under the action of the power spring 3.
  • the presently described pump uses the electromagnet to fill the cylinder 8 and load the power spring 3, and uses the loaded power spring 3 to force the fluid out of the cylinder 8 through the output connection 2, it is known to have a pump operating in the opposite sense. That is, it is known to use the spring to draw fluid into the cylinder, and use the electromagnet to force the fluid out of the cylinder through the output connection.
  • the electrical solenoid 5 is driven by a half-wave rectified voltage at mains frequency (50 Hz in Europe), which provides a simple drive voltage signal to the solenoid 5.
  • the present invention provides an alternative method of driving a solenoid pump.
  • a method of driving a solenoid pump of the type comprising a metal shuttle urged by a solenoid against a spring with the spring providing the force for a pumping stroke of the shuttle, for example the solenoid pump described with reference to Figure 1.
  • the method comprises applying a periodic driving voltage to the solenoid.
  • Each period of the driving voltage comprises a first portion during which the driving voltage increases from a minimum voltage to a maximum voltage to compress the spring, a second portion during which the driving voltage decreases from the maximum voltage to the minimum voltage to release the spring, and a third portion during which the driving voltage is maintained at the minimum voltage.
  • the duration of the second portion is substantially less than the duration of the first portion.
  • the driving voltage is reduced relatively quickly from the maximum voltage to the minimum voltage during the second portion.
  • the spring is quickly freed to provide the force for the pumping stroke of the shuttle with the minimum energy being wasted by the driving voltage causing the solenoid to act against the released spring.
  • the driving voltage may decrease from the maximum voltage to the minimum voltage gradually, for example linearly.
  • the duration of the second portion may be less than half of the duration of the first portion, particularly less than 10% of the duration of the second portion.
  • the driving voltage may decrease from the maximum voltage to the minimum voltage substantially instantaneously during the second portion.
  • the duration of the second portion may be negligible compared to the duration of the first portion.
  • the driving voltage increases from the minimum voltage to the maximum voltage substantially linearly during the first portion. Although this configuration is presently preferred, it is possible for the driving voltage to increase otherwise than linearly during the first portion. In embodiments of the invention, the driving voltage has a sawtooth waveform.
  • the method may comprise controlling the duration of the third portion to provide a required flow rate through the pump.
  • the method may comprise controlling the maximum voltage to provide a required flow rate through the pump.
  • the frequency of the driving voltage may be different to the frequency of a supply voltage providing electrical power for the driving voltage.
  • the frequency of the supply voltage is not limited to 50 Hz / 60 Hz.
  • the method may therefore comprise controlling the frequency of the driving voltage to provide a required flow rate through the pump.
  • the minimum voltage is zero volts.
  • the invention extends to a driver circuit for a solenoid pump, the driver circuit configured to generate a driving voltage in accordance with the method of the invention.
  • the driver circuit may be an analogue circuit, a digital circuit or a combination of analogue and digital circuitry.
  • the driver circuit may use pulse width modulation (PWM) to generate a sawtooth, or other, waveform.
  • PWM pulse width modulation
  • the invention further extends to a solenoid pump in combination with the driver circuit.
  • Figure 1 is a sectional view of an electromagnetic pump
  • Figure 2 is a graph showing a comparison between a known driving method for the electromagnetic pump of Figure 1 and a driving method according to an embodiment of the present invention
  • Figure 3 is a graph illustrating a driving method according to a further embodiment of the present invention.
  • Figure 4 is a graph illustrating a driving method according to a yet further embodiment of the present invention.
  • Figure 5 is a schematic of a driving circuit according to an embodiment of the present invention.
  • Figure 2 shows, in the upper graph, a comparison of a sawtooth driving voltage for a solenoid pump according to an embodiment of the invention (dashed line) to a half- wave rectified driving voltage of the prior art (solid line).
  • the solenoid pump may be of the type described in relation to Figure 1.
  • the lower graph in Figure 2 shows the
  • the sawtooth driving voltage requires only 60% of the maximum voltage of the rectified driving voltage. Furthermore, the rapid decrease of the sawtooth driving voltage from the (60%) maximum voltage to zero volts, also saves energy. The amount of energy saved by using the sawtooth driving voltage is shaded in Figure 2.
  • Figure 3 shows a variation of the sawtooth driving voltage of an embodiment of the invention in a representation corresponding to Figure 2.
  • the first portion of the sawtooth waveform has a duration of 10ms, as in the waveform of Figure 2.
  • the second portion of the sawtooth waveform, in which the driving voltage drops from a maximum value to zero volts is substantially instantaneous.
  • the duration of the third portion of the sawtooth waveform in which the driving voltage is maintained at zero volts is reduced relative to the waveform shown in Figure 2 from 10ms to 8ms. In this way, the frequency of the driving voltage is increased from 50 Hz to 56 Hz.
  • the shorter duration of each period of the sawtooth waveform increases the flow rate through the pump.
  • Figure 4 shows a variation of the sawtooth driving voltage of an embodiment of the invention in a representation corresponding to Figures 2 and 3.
  • the first portion of the sawtooth waveform has a duration of 8ms, which is shorter than in the waveform of Figures 2 and 3.
  • the rate of change (gradient) of the driving voltage remains the same, however, such that the maximum voltage achieved during the first portion of the waveform is reduced, compared to Figures 2 and 3.
  • the second portion of the sawtooth waveform, in which the driving voltage drops from a maximum value to zero volts is substantially instantaneous.
  • the sawtooth driving voltage has the advantage that it uses less energy to achieve the same spring force than a conventional driving voltage. This means that a smaller power supply can be used and less heat is generated during operation of the pump, which increases the pump duty cycle. Furthermore, the operating frequency of the pump can be "tuned" to achieve the minimum mechanical noise from the pump
  • FIG. 5 is a schematic of a driving circuit according to an embodiment of the present invention.
  • the driving circuit 20 comprises a power supply 22 connecter to a microcontroller 24.
  • the microcontroller is connected to a pump solenoid 28 via a switching circuit 26.
  • the pump solenoid is typically the solenoid 5 as described in Figure 1.
  • the microcontroller 24 comprises a memory and at least one processor.
  • the memory of the microcontroller 24 includes instructions which, when executed, cause the at least one processor to control the switching circuit 26 and the pump solenoid 28 to operate in accordance with methods as described previously.
  • the switching circuit 26 provides inputs for the microcontroller 24 to control the operation of the pump solenoid 28.
  • a method of driving a solenoid pump of the type comprising a metal shuttle urged by a solenoid against a spring with the spring providing the force for the pumping stroke of the shuttle.
  • the method comprises applying a periodic driving voltage to the solenoid.
  • Each period of the driving voltage comprises a first portion during which the driving voltage increases from a minimum voltage to a maximum voltage to compress the spring, a second portion during which the driving voltage decreases from the maximum voltage to the minimum voltage to release the spring, and a third portion during which the driving voltage is maintained at the minimum voltage.
  • the duration of the second portion is substantially less than the duration of the first portion and may be substantially instantaneous.
  • the driving voltage increases from the minimum voltage to the maximum voltage substantially linearly during the first portion, such that the driving voltage has a sawtooth waveform.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

L'invention concerne un procédé de commande d'une pompe à solénoïde du type comprenant une navette métallique (4) sollicitée par un solénoïde (5) contre un ressort (3), le ressort fournissant la force pour la course de pompage de la navette. Le procédé consiste à : appliquer une tension d'entraînement périodique au solénoïde, chaque période de la tension d'entraînement comprenant une première partie pendant laquelle la tension d'entraînement augmente d'une tension minimale à une tension maximale pour comprimer le ressort, une deuxième partie pendant laquelle la tension d'entraînement diminue de la tension maximale à la tension minimale afin de relâcher le ressort et une troisième partie pendant laquelle la tension d'entraînement est maintenue à la tension minimale ; la durée de la deuxième partie étant sensiblement inférieure à la durée de la première partie et pouvant être sensiblement instantanée. La tension d'entraînement augmente de la tension minimale à la tension maximale de manière sensiblement linéaire pendant la première partie, de sorte que la tension d'entraînement ait une forme d'onde en dents de scie.
EP16791063.7A 2015-10-30 2016-10-31 Dispositif de commande de pompe à solénoïde Active EP3368769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1519246.1A GB2543832B (en) 2015-10-30 2015-10-30 Pump driver
PCT/GB2016/053371 WO2017072532A1 (fr) 2015-10-30 2016-10-31 Dispositif de commande de pompe à solénoïde

Publications (2)

Publication Number Publication Date
EP3368769A1 true EP3368769A1 (fr) 2018-09-05
EP3368769B1 EP3368769B1 (fr) 2021-08-04

Family

ID=55130482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16791063.7A Active EP3368769B1 (fr) 2015-10-30 2016-10-31 Dispositif de commande de pompe à solénoïde

Country Status (5)

Country Link
US (1) US20180320673A1 (fr)
EP (1) EP3368769B1 (fr)
ES (1) ES2884113T3 (fr)
GB (1) GB2543832B (fr)
WO (1) WO2017072532A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018115119A1 (de) * 2018-06-22 2019-12-24 Sysko Ag Getränkepumpe

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328810A (en) * 1979-10-03 1982-05-11 United States Surgical Corporation Automatic blood pressure system
JPS57122175A (en) * 1981-01-20 1982-07-29 Yamatake Honeywell Co Ltd Electromagnetic pump drive unit
JPS5929780A (ja) * 1982-08-10 1984-02-17 Yamatake Honeywell Co Ltd ソレノイドオイルポンプ駆動回路
JPS59211775A (ja) * 1983-05-18 1984-11-30 Shizuoka Seiki Co Ltd 電磁ポンプの油量制御装置
US5017854A (en) * 1990-10-29 1991-05-21 Hughes Aircraft Company Variable duty cycle pulse width modulated motor control system
JP2002130117A (ja) * 2000-10-18 2002-05-09 Mikuni Corp 電磁駆動型プランジャポンプ
US7184254B2 (en) * 2002-05-24 2007-02-27 Airxcel, Inc. Apparatus and method for controlling the maximum stroke for linear compressors
EP1567769A1 (fr) * 2002-11-19 2005-08-31 Empresa Brasileira De Compressores S/A - Embraco Systeme de commande du mouvement d'un piston
FR2855223B1 (fr) * 2003-05-22 2005-07-01 Seb Sa Procede pour detecter l'etat de charge d'une pompe electromagnetique a noyau vibrant d'un appareil electrodomestique.
JP2006112417A (ja) * 2004-09-16 2006-04-27 Tgk Co Ltd 可変容量圧縮機用制御弁
US7408310B2 (en) * 2005-04-08 2008-08-05 Lg Electronics Inc. Apparatus for controlling driving of reciprocating compressor and method thereof
EP1832945A1 (fr) * 2006-03-07 2007-09-12 S-Rain Control A/S Système et procédé d'optimisation et de mise à disposition d'alimentation pour un noyau de vanne
WO2008026661A1 (fr) * 2006-08-29 2008-03-06 Panasonic Corporation Dispositif de commande de pompe volumétrique alternative, dispositif électrique utilisant celui-ci, système de pile à combustible et procédé de commande de pompe volumétrique alternative
BRPI0800251B1 (pt) * 2008-02-22 2021-02-23 Embraco Indústria De Compressores E Soluções Em Refrigeração Ltda sistema e método de controle de compressor linear
DE102009019450A1 (de) * 2009-04-29 2010-11-11 Webasto Ag Verfahren zum Betreiben und Vorrichtung mit einer Dosierpumpe
FR2960268B1 (fr) * 2010-05-21 2013-04-05 Sauermann Ind Sa Pompe electromagnetique a piston oscillant

Also Published As

Publication number Publication date
ES2884113T3 (es) 2021-12-10
EP3368769B1 (fr) 2021-08-04
WO2017072532A1 (fr) 2017-05-04
US20180320673A1 (en) 2018-11-08
GB2543832A (en) 2017-05-03
GB2543832B (en) 2020-03-11
GB201519246D0 (en) 2015-12-16

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