EP3368769A1 - Solenoid pump driver - Google Patents
Solenoid pump driverInfo
- 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
Links
- 238000000034 method Methods 0.000 claims abstract description 32
- 230000007423 decrease Effects 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 4
- 230000000737 periodic effect Effects 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 description 11
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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.
Abstract
Description
Claims
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 (en) | 2015-10-30 | 2016-10-31 | Solenoid pump driver |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3368769A1 true EP3368769A1 (en) | 2018-09-05 |
EP3368769B1 EP3368769B1 (en) | 2021-08-04 |
Family
ID=55130482
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16791063.7A Active EP3368769B1 (en) | 2015-10-30 | 2016-10-31 | Solenoid pump driver |
Country Status (5)
Country | Link |
---|---|
US (1) | US20180320673A1 (en) |
EP (1) | EP3368769B1 (en) |
ES (1) | ES2884113T3 (en) |
GB (1) | GB2543832B (en) |
WO (1) | WO2017072532A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018115119A1 (en) * | 2018-06-22 | 2019-12-24 | Sysko Ag | drinks pump |
Family Cites Families (16)
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 (en) * | 1982-08-10 | 1984-02-17 | Yamatake Honeywell Co Ltd | Drive circuit for solenoid oil pump |
JPS59211775A (en) * | 1983-05-18 | 1984-11-30 | Shizuoka Seiki Co Ltd | Oil quantity controller of solenoid pump |
US5017854A (en) * | 1990-10-29 | 1991-05-21 | Hughes Aircraft Company | Variable duty cycle pulse width modulated motor control system |
JP2002130117A (en) * | 2000-10-18 | 2002-05-09 | Mikuni Corp | Electromagnetically driven plunger pump |
US7184254B2 (en) * | 2002-05-24 | 2007-02-27 | Airxcel, Inc. | Apparatus and method for controlling the maximum stroke for linear compressors |
CN1735749A (en) * | 2002-11-19 | 2006-02-15 | 巴西压缩机股份有限公司 | A control system for the movement of a piston |
FR2855223B1 (en) * | 2003-05-22 | 2005-07-01 | Seb Sa | METHOD FOR DETECTING THE CHARGE STATE OF A VIBRANT CORE ELECTROMAGNETIC PUMP OF AN ELECTRODEOMESTIC APPARATUS. |
JP2006112417A (en) * | 2004-09-16 | 2006-04-27 | Tgk Co Ltd | Control valve for variable displacement compressor |
US7408310B2 (en) * | 2005-04-08 | 2008-08-05 | Lg Electronics Inc. | Apparatus for controlling driving of reciprocating compressor and method thereof |
EP1832945A1 (en) * | 2006-03-07 | 2007-09-12 | S-Rain Control A/S | A system and a method for optimising and providing power to a core of a valve |
WO2008026661A1 (en) * | 2006-08-29 | 2008-03-06 | Panasonic Corporation | Reciprocating pump control device, electric device using this, fuel cell system, and reciprocating pump control method |
BRPI0800251B1 (en) * | 2008-02-22 | 2021-02-23 | Embraco Indústria De Compressores E Soluções Em Refrigeração Ltda | linear compressor control system and method |
DE102009019450A1 (en) * | 2009-04-29 | 2010-11-11 | Webasto Ag | Method for operating and device with a metering pump |
FR2960268B1 (en) * | 2010-05-21 | 2013-04-05 | Sauermann Ind Sa | ELECTROMAGNETIC OSCILLATING PISTON PUMP |
-
2015
- 2015-10-30 GB GB1519246.1A patent/GB2543832B/en active Active
-
2016
- 2016-10-31 US US15/771,494 patent/US20180320673A1/en not_active Abandoned
- 2016-10-31 WO PCT/GB2016/053371 patent/WO2017072532A1/en active Application Filing
- 2016-10-31 ES ES16791063T patent/ES2884113T3/en active Active
- 2016-10-31 EP EP16791063.7A patent/EP3368769B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
GB2543832A (en) | 2017-05-03 |
GB2543832B (en) | 2020-03-11 |
EP3368769B1 (en) | 2021-08-04 |
ES2884113T3 (en) | 2021-12-10 |
GB201519246D0 (en) | 2015-12-16 |
US20180320673A1 (en) | 2018-11-08 |
WO2017072532A1 (en) | 2017-05-04 |
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