EP2294317A1 - Durch einen polymerwandler angetriebene pumpe - Google Patents

Durch einen polymerwandler angetriebene pumpe

Info

Publication number
EP2294317A1
EP2294317A1 EP09737757A EP09737757A EP2294317A1 EP 2294317 A1 EP2294317 A1 EP 2294317A1 EP 09737757 A EP09737757 A EP 09737757A EP 09737757 A EP09737757 A EP 09737757A EP 2294317 A1 EP2294317 A1 EP 2294317A1
Authority
EP
European Patent Office
Prior art keywords
pump according
transducer
laminate
film
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
EP09737757A
Other languages
English (en)
French (fr)
Other versions
EP2294317B1 (de
Inventor
Morten Kjaer Hansen
Benjamin Thomsen
Michael Tryson
Mohamed Benslimane
Yousef Iskandarani
Christopfer Mose
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.)
Danfoss PolyPower AS
Original Assignee
Danfoss PolyPower AS
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 Danfoss PolyPower AS filed Critical Danfoss PolyPower AS
Publication of EP2294317A1 publication Critical patent/EP2294317A1/de
Application granted granted Critical
Publication of EP2294317B1 publication Critical patent/EP2294317B1/de
Not-in-force 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
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/006—Micropumps
    • 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
    • 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
    • F04B43/043—Micropumps

Definitions

  • a piston In a traditional positive displacement pump, a piston is reciprocating in a cylinder, and by opening and closing inlet and outlet valves, alternately, a fluid is pumped and optionally compressed by the piston.
  • the piston and cylinder are made from relatively inflexible metal materials, and to provide a good efficiency and long life of the piston pump, the piston and cylinder must be made with fine tolerances. Typically, a large portion of the manufacturing costs of such pumps are spent on the mechanical interaction between the piston, cylinder and other moving parts.
  • One problem with the traditional piston pumps is that they may produce excessive noise, in particular if the reciprocating movement is generated by an eccentric element on a rotary drive shaft.
  • the housing may be provided in any kind of material, e.g. in a hard polymeric material, in metal such as brass or aluminium, or even in a soft polymeric material such as silicone etc.
  • the pump may also include micro channels and may e.g. comprise a silicon wafer etc.
  • the film and the electrically conductive layers may have a relatively uniform thickness, e.g. with a largest thickness which is less than 110 percent of an average thickness of the film, and a smallest thickness which is at least 90 percent of an average thickness of the film.
  • the first electrically conductive layer may have a largest thickness which is less than 110 percent of an average thickness of the first electrically conductive layer, and a smallest thickness which is at least 90 percent of an average thickness of the first electrically conductive layer.
  • the electrically conductive layer may have a thickness in the range of 0.01 ⁇ m to 0.1 ⁇ m, such as in the range of 0.02 ⁇ m to 0.09 ⁇ m, such as in the range of 0.05 ⁇ m to 0.07 ⁇ m.
  • the electrically conductive layer is preferably applied to the film in a very thin layer. This facilitates good performance and facilitates that the electrically conductive layer can follow the corrugated pattern of the surface of the film upon deflection.
  • the electrically conductive layer may have a resistivity which is less than 10 "2 ⁇ cm such as less than 10"* ⁇ cm.
  • the dielectric material may have a resistivity which is larger than 10 10 ⁇ -cm.
  • the resistivity of the dielectric material is much higher than the resistivity of the electrically conductive layer, preferably at least 10 14 -10 18 times higher.
  • the surface pattern may comprise corrugations which render the length of the electrically conductive layer in a lengthwise direction longer than the length of the composite as such in the lengthwise direction.
  • the corrugated shape of the electrically conductive layer thereby facilitates that the composite can be stretched in the lengthwise direction without having to stretch the electrically conductive layer in that direction, but merely by evening out the corrugated shape of the electrically conductive layer.
  • the corrugated shape of the electrically conductive layer may be a replica of the surface pattern of the film.
  • a ratio between an average height of the waves and an average thickness of the film may be between 1/50 and 1/2, such as between 1/40 and 1/3, such as between 1/30 and 1/4, such as between 1/20 and 1/5.
  • the second electrically conductive layer may, like the first layer, have a surface pattern, e.g. including a corrugated shape which could be provided as a replica of a surface pattern of the film.
  • the second electrically conductive layer is substantially flat. If the second electrically conductive layer is flat, the composite will only have compliance on one of its two surfaces while the second electrically conductive layer tends to prevent elongation of the other surface. This provides a composite which bends when an electrical potential is applied across the two electrically conductive layers.
  • Each composite layer may comprise:
  • an electrode group structure may be defined, such that every second electrically conductive layer becomes an electrode of a first group and every each intermediate electrically conductive layer becomes an electrode of a second group of electrodes.
  • a potential difference between the electrodes of the two groups will cause deformation of the film layers located there between, and the composite is therefore electroactive.
  • a last layer will remain inactive. Accordingly, a multilayer composite with three layers comprises 2 active layers, a multilayer composite with 10 layers comprises 9 active layers, etc.
  • the electrically conductive layers are deposited on front surfaces of the films, it may be an advantage to arrange the layers with the rear surfaces towards each other. In this way, the multilayer composite becomes less vulnerable to faults in the film. If the film in one layer has a defect which enables short circuiting of electrodes on opposite surfaces thereof, it would be very unlikely if the layer which is arranged with its rear surface against the film in question has a defect at the same location. In other words, at least one of the two films provides electrical separation of the two electrically conductive layers.
  • the transducer may be provided with at least three independent active portions which can be activated independently and each portion being arranged to enable deformation of the body at different locations along the path.
  • a first portion being upstream the flow direction may firstly be activated to squeeze the body and close the path at an upstream first location.
  • a second portion located between the other two portions could be activated while the first portion prevents backflow in the path.
  • the deformation of the body caused by the second portion will press fluid in the path in the downstream direction.
  • the last, third, portion could be activated to prevent backflow in the path while the first and second portions are released.
  • a control system may be provided which is adapted to activate the portions in a predetermined sequence.
  • the body may have a build-in tension which presses the path towards a neutral configuration from which it can be pushed against the build-in tension towards an activated configuration by the transducer.
  • the neutral configuration may be a configuration where the flow resistance in the path is either lower or higher than in the activated configuration.
  • the laminate may be rolled around an axially extending axis to form a transducer of an elongated shape extending in the axial direction.
  • the rolled laminate may define a wall thickness, t, and the ratio t/r g may be within the range 1/1000 to 2, such as within the range 1/500-1 , such as within the range 1/300-2/3.
  • This ratio reflects how thin or thick the wall defined by the rolled laminate is as compared to the total size of the rolled laminate. If the ratio is high the wall thickness is large, and the hollow cavity defined by the rolled transducer is relatively small. On the other hand, if the ratio is low the wall thickness is small, and the hollow cavity defined by the rolled laminate is relatively large.
  • the rolled transducer may comprise a centre rod arranged in such a manner that the transducer is rolled around the centre rod, the centre rod having a modulus of elasticity which is lower than a modulus of elasticity of the dielectric material.
  • the hollow cavity defined by the tubular member may be filled by the centre rod, or the centre rod may be hollow, i.e. it may have a tubular structure.
  • the centre rod may support the rolled transducer.
  • it is important that the modulus of elasticity of the centre rod is lower than the modulus of elasticity of the dielectric material in order to prevent that the centre rod inhibits the function of the transducer.
  • the rolled transducer may comprise a centre rod arranged in such a manner that the transducer is rolled around the centre rod, and the centre rod may have an outer surface abutting the rolled transducer, said outer surface having a friction which allows the rolled transducer to slide along said outer surface during actuation of the transducer.
  • the centre rod could, in this case, e.g. be a spring. Since the rolled transducer is allowed to slide along the outer surface of the centre rod, the presence of the centre rod will not inhibit elongation of the transducer along a longitudinal direction defined by the centre rod, and the operation of the transducer will thereby not be inhibited by the presence of the centre rod due to the low friction characteristics of the centre rod.
  • the transducers may e.g. be fixed to the wall of the chamber at a location between the end portions. When the transducers are actuated, they expand axially and thus reduce volumes of spaces provided between adjacent transducers. When the transducers contract axially, the volumes of the spaces between adjacent transducers increase. Additional spaces may be provided between the end faces of each of the transducers - i.e. between an outer surface of the rolled laminate and an inner surface of the cylindrical chamber or in inner cavities within the rolled transducers. When the transducers contract or expand simultaneously, the volumes of these additional spaces increase or decrease in a reverse order relative to the spaces between the transducers. By providing a set of check valves or valves having a similar uni-directional function at each end of the spaces, a pumping action may be obtained during simultaneous actuation of all transducers in the cylinder.
  • Fig. 3 illustrates a laminate for a transducer
  • Fig. 27 illustrates an electrical diagram of a control system for controlling the pumps
  • the bias source 105 provides, via the connection 107, a low voltage test signal which is applied to the laminate simultaneously with the bias signal.
  • the filter 108 extracts the low voltage signal from the high voltage signal, and the capacitance measuring device 109 determines the actual capacitance of the transducer 106.
  • the capacitance is determined while the film is deflected by the high voltage bias signal and therefore, the capacitance indicates how much the film was deflected by the bias signal.
  • the capacitance is converted into feedback signal 110, in this case in form of a comparative bias voltage, i.e.
EP09737757.6A 2008-04-30 2009-04-30 Durch einen polymerwandler angetriebene pumpe Not-in-force EP2294317B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200800619 2008-04-30
PCT/DK2009/000098 WO2009132651A1 (en) 2008-04-30 2009-04-30 A pump powered by a polymer transducer

Publications (2)

Publication Number Publication Date
EP2294317A1 true EP2294317A1 (de) 2011-03-16
EP2294317B1 EP2294317B1 (de) 2013-04-17

Family

ID=40793295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09737757.6A Not-in-force EP2294317B1 (de) 2008-04-30 2009-04-30 Durch einen polymerwandler angetriebene pumpe

Country Status (4)

Country Link
US (1) US20110189027A1 (de)
EP (1) EP2294317B1 (de)
CN (1) CN102084133A (de)
WO (1) WO2009132651A1 (de)

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WO2013044195A2 (en) * 2011-09-22 2013-03-28 Parker-Hannifin Corporation Selp pumping and sensing hose utilizing electroactive polymer strips
CN104870040B (zh) * 2012-12-18 2017-08-29 皇家飞利浦有限公司 用于患者界面的eap驱动气泵
CN104763620B (zh) * 2014-10-31 2016-01-27 浙江大学 柔性蠕动泵
DE102014224697A1 (de) 2014-12-03 2016-06-09 Zf Friedrichshafen Ag Gangwähler für ein Getriebe
US10119532B2 (en) * 2015-02-16 2018-11-06 Hamilton Sundstrand Corporation System and method for cooling electrical components using an electroactive polymer actuator
DE102016014832A1 (de) * 2016-12-14 2018-06-14 Drägerwerk AG & Co. KGaA Kammerpumpe und Verfahren zum Betrieb einer Kammerpumpe
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CN107420291B (zh) * 2017-07-13 2019-04-23 西安电子科技大学 一种基于可变弹性模量的复合薄膜压电微泵
CN112081723B (zh) * 2020-08-18 2021-12-14 华南农业大学 一种基于谐振差分位移放大压电泵
CN113482893B (zh) * 2021-06-10 2022-04-01 浙江大学 一种基于介电弹性材料的柔性泵
CN116971970B (zh) * 2023-09-22 2023-12-22 哈尔滨工业大学 基于缩放结构的电驱动多线程柔性电流体泵及其制备方法

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See references of WO2009132651A1 *

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CN102084133A (zh) 2011-06-01
EP2294317B1 (de) 2013-04-17
WO2009132651A1 (en) 2009-11-05
US20110189027A1 (en) 2011-08-04

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