EP1646789A1 - Pumpe mit mindestens einer pumpkammer und elektroden zum erzeugen eines elektrischen wechselfeldes - Google Patents
Pumpe mit mindestens einer pumpkammer und elektroden zum erzeugen eines elektrischen wechselfeldesInfo
- Publication number
- EP1646789A1 EP1646789A1 EP04738826A EP04738826A EP1646789A1 EP 1646789 A1 EP1646789 A1 EP 1646789A1 EP 04738826 A EP04738826 A EP 04738826A EP 04738826 A EP04738826 A EP 04738826A EP 1646789 A1 EP1646789 A1 EP 1646789A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- pumping
- field
- liquid
- alternating
- 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
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
- 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
-
- 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
Definitions
- the invention relates to a pump with the features according to the preamble of claim 1.
- a pump of the known type has a pump chamber with two electrodes, of which a dielectric element is arranged on one electrode.
- the dielectric element has a sawtooth structure in the longitudinal direction of the pump chamber and in the pumping direction. Due to the sawtooth structure, there is a location-dependent, temporal delay of the alternating electrical field on the outside of the dielectric element facing the liquid to be pumped, so that an electric traveling field is formed in the longitudinal direction of the chamber. Due to the electric traveling field, the liquid to be pumped is polarized and moves along the traveling field direction, so that a pumping force is generated in the traveling field direction.
- the pump power contributes to the Known pump essentially only the liquid portion which has the "correct" distance from the dielectric sawtooth structure; this is the area near the sawtooth structure.
- the liquid portion located in the other "volume” - ie outside the edge area of the sawtooth structure - in the remaining pump chamber area is virtually not subject to a pump effect. Specifically, this is due to the fact that the electric traveling field is electrically “seen” only at an optimal distance to the dielectric sawtooth structure.
- the traveling fields of the adjacent saw teeth overlap in such a way that a sum field is created
- the pumping force of the previously known traveling field pump is therefore based on a surface effect or a near-surface effect in the area of the dielectric sawtooth structure.
- the invention has for its object to provide a pumping chamber which has a particularly large pumping effect.
- the dielectric element is arranged and configured in such a way that the alternating electric field has a stationary and time-independent field gradient within the pumping chamber in the pumping direction.
- An essential advantage of the pump according to the invention is its particularly large pumping action with a very simple and inexpensive construction.
- the great pumping effect is brought about in the pump according to the invention by that in the pumping chamber a fixed and time-independent
- Field gradient is stationary and time-independent, in addition to that located in the edge region of the dielectric element
- Liquid also pumped the remaining liquid volume.
- the pumping effect in the pump according to the invention is brought about by the stationary field gradient in the pumping direction.
- the field gradient causes a location-dependent polarization distribution or space charge in the pumping direction in the liquid, both in the edge area and in the volume area or in the center area of the pump chamber. This is due to the fact that part of the energy of the alternating electrical field is absorbed in the liquid, as a result of which the temperature in the liquid increases locally in the direction of increasing field strength of the alternating field. With increasing temperature, the physical conductivity of the liquid also rises locally due to physical reasons, the dielectric constant of the liquid and thus the polarization ability of the liquid also changing locally.
- Another significant advantage of the pump according to the invention is the frequency independence of the pump.
- a uniform pumping effect is achieved with the invention Pump namely causes in a particularly large frequency range of the alternating electrical field. Quasi up to an upper one, from the respective liquid and the geometry of the
- a third essential advantage of the pump according to the invention is that the alternating electric field acts on the portion “in-phase portion” of the polarized liquid and / or the induced space charges that is “in phase” with the alternating field
- a fourth essential advantage of the pump according to the invention is that, due to the stationary and time-independent field gradient, forces that counteract the pumping direction can be exerted on objects located in the area of the field gradient - such as particles, bacteria, viruses, other cells, gas bubbles, in particular air bubbles. Under certain circumstances, this requires the selection of a suitable frequency of the alternating field. At a suitable frequency of the alternating field, the liquid is then freed from the above-mentioned objects, preferably gas or air bubbles, by these objects are prevented from flowing through the pump in the pumping direction.
- a particularly good pumping effect is achieved if the electrical element is arranged and designed such that the field strength of the alternating electrical field increases in the pumping direction.
- the dielectric element can also be arranged and designed such that the field strength of the alternating electrical field drops in the pumping direction.
- the at least one pump chamber advantageously has at least one outflow opening and at least one inflow opening.
- a particularly large pumping force and thus a particularly large pumping effect is advantageously achieved if the dielectric element and / or the electrode device are arranged and designed in such a way that the field profile of the alternating electrical field and / or the flow profile of the liquid in the area between the inflow opening and the Drain opening is wedge-shaped.
- the wedge-shaped field profile and / or the wedge-shaped flow profile of the liquid can preferably be formed in a straight wedge shape or curved wedge shape.
- the alternating electrical field can, for example, have a sinusoidal or rectangular time profile and / or be generated continuously or in a pulsed manner.
- Energy component of the alternating electrical field - preferably at least 50% of the energy of the alternating field - above that Dispersion frequency of the electrical double-layer phenomena of the liquid to be pumped lies.
- the frequency of the alternating electrical field is preferably above 200 Hz.
- Pump direction is set by selecting the frequency of the alternating field.
- the pumping effect in the pump according to the invention is based on local heating of the liquid due to a partial absorption of the alternating electric field in the liquid.
- additional heating elements in particular heating wires, heat radiators or electronic components, are provided with which locally uneven heating of the liquid to be pumped is brought about or intensified.
- the frequency of the alternating electrical field is an electrical resonance frequency of the pump.
- the resonance frequency of the pump depends, for example, on the properties of the electrodes, the electrical feed lines, the dielectric properties of the pump medium and, if appropriate, on additional electrical and / or electronic components.
- the dielectric element of the pump can preferably be designed in the form of one or more webs, each of which has at least one opening which forms the drain opening of the pump.
- a drain channel can be connected to the drain opening of the pump chamber, in which the liquid pumped out by the pump is received.
- the direction of flow in the drainage channel can be oriented essentially perpendicular to the pumping direction in the pump chamber in order to ensure a particularly compact construction of the pump and the drainage channel connected to it.
- the electrode device can be formed in a particularly simple and thus advantageous manner by two electrode plates, which lie opposite one another.
- a particularly compact construction with high pumping power can preferably be achieved if the electrode plates are curved and face each other with their concave surfaces.
- the electrode plates can also be arranged in parallel.
- a particularly great pumping effect is advantageously achieved with the pump if at least one electrode of the electrode device is arranged in the region of the discharge opening of the pumping chamber.
- the electrode arranged in the area of the drain opening can be configured, for example, in a ring shape and enclose the drain opening in a ring shape.
- One of the electrodes of the electrode device is preferably formed by an electrode rod, which is arranged perpendicular to the electrode surface of a counter electrode assigned to it.
- the pump can advantageously have at least two pumping chambers, each of which has its outlet opening with the same outlet channel
- the pump pressure of the pump can be increased by equipping the pump with at least two pump chambers which are arranged one after the other in the pumping direction. Due to such a “series connection” of pumping chambers, the flow rate of the liquid to be pumped can be increased under load and thus the “pump pressure” of the pump can be increased.
- the pump is equipped with a plurality of pumping chambers which are arranged in a matrix.
- a matrix-like arrangement of pump chambers or a “pump matrix” is understood to mean that at least two pump chambers are arranged “in parallel” and at least two pump chambers in “row”.
- the pump chambers can be arranged in one or more levels or in a spatial structure.
- the invention also relates to a method for pumping a liquid, in which an alternating electrical field is formed and influenced by at least one dielectric element, the pumping force required for pumping the liquid being generated with the aid of the alternating electrical field.
- the invention has for its object to provide a method for pumping a liquid, in which a particularly large pumping capacity can be achieved.
- This object is achieved according to the invention in that the electrical alternating field is influenced with the dielectric element in such a way that a stationary and time-independent field strength gradient arises in the pump chamber.
- the pumping method according to the invention can advantageously be used to free a liquid from disruptive objects such as particles, bacteria, viruses, other cells, gas and / or air bubbles.
- the frequency of the alternating field is selected such that the objects (or object types or object types) contained in the liquid experience a force opposite to the pumping force (“negative” dielectrophoretic force).
- negative dielectrophoretic force a force opposite to the pumping force
- FIG. 1 shows a first exemplary embodiment of a pump according to the invention, with which the method according to the invention can be carried out
- FIG. 1b the cross section of the pump according to FIG. Fig. 2a u. 2b shows a second exemplary embodiment of a pump according to the invention
- 3a u. 3b shows a third exemplary embodiment of a pump according to the invention
- Fig. 4a u. 4b shows a fourth exemplary embodiment of a pump according to the invention
- Fig. 5a u. 5b shows a fifth exemplary embodiment of a pump according to the invention
- 6a u. 6b shows a sixth exemplary embodiment for a pump according to the invention
- Fig. 7a u. 7b shows a seventh exemplary embodiment for a pump according to the invention
- FIG. 8a shows an eighth exemplary embodiment for a pump according to the invention.
- 9a u. 9b shows a ninth exemplary embodiment of a pump according to the invention
- FIG. 11 shows the spectral course of the pump speed as a function of the frequency of the alternating electrical field within the pump chamber in the pump according to FIGS. 10a to 10c.
- FIG. 1 A first exemplary embodiment of a pump 1 - for example a micropump - with chamber walls 5 is shown in FIG.
- a pump chamber 10 can be seen in which one electrically, for example, weakly conductive liquid 20 with a conductivity is preferably contained in a range between 1 ⁇ S / m to 10 S / m.
- the liquid 20 can also be a non-conductive liquid such as alcohol.
- Pump chamber 10 has an inflow opening 30 and a
- Drain opening 40 on.
- the weakly conductive liquid 20 is introduced into the pump chamber 10 through the inflow opening 30;
- the liquid 20 leaves the pump chamber 10 through the drain opening 40.
- a drain channel 50 is connected to the drain opening 40, through which the drainage channel
- the pump chamber 10 is equipped with an electrode device, which is formed by a first electrode 70 and a second electrode 80.
- the two electrodes 70 and 80 are each electrode plates which are arranged parallel to one another and each abut the chamber walls 5 of the pump chamber 10.
- a dielectric element 90 in the form of a web is arranged in the pump chamber 10.
- This web 90 has an opening or a web opening 100 which has a constant diameter.
- the web 90 consists of a solid material with dielectric properties that differ from the properties of the liquids 20 to be pumped.
- the values of the conductivity and the permittivity of the dielectric web 90 are each preferably lower than the corresponding values of the weakly conductive liquid 20.
- the pump according to the figure la is operated as follows.
- An alternating electric field with a predetermined frequency is applied to the two electrodes 70 and 80.
- the frequency is preferably at least 200 Hz.
- the upper cut-off frequency is not that of the alternating electric field should be exceeded depends on the electrical conductivity of the liquid 20 to be pumped.
- the upper limit frequency can be found in the
- the resulting pump speed is in ⁇ m / s depending on the frequency of the electrical
- Diagram according to FIG. 11 has a logarithmic division. It can be seen from the diagram according to FIG. 11 that the pumping speed is virtually constant at low frequencies and only drops significantly when a limit frequency is reached.
- the cut-off frequency is dependent on the electrical conductivity of the weakly conductive liquid 20. The higher the conductivity of the liquid 20, the greater the limit frequencies that can be reached.
- the field profile of the alternating electrical field applied to the two electrodes 70 and 80 is indicated by equipotential lines 110 in FIG.
- the equipotential lines 110 represent the potential profile of the alternating electrical field.
- the alternating electrical field has a stationary and time-independent field gradient within the pump chamber 10.
- the field strength increases sharply in the direction of the web opening 100 and thus in the pumping direction 120. Due to this field gradient or due to the increase in the field strength in the direction of the web opening 100, there is a location-dependent distribution of the temperature in the liquid 20 within the pumping chamber 10. This is specifically due to the fact that the liquid 20 is weakly conductive and thus the electrical alternating field energy withdraws. This energy absorption leads to a heating of the liquid 20, the heating due to the Field gradient within the pump chamber 10 is location-dependent.
- an alternating electrical field is also arranged in the drain channel 50 due to the arrangement of the second electrode 20 below the drain channel 50.
- the field profile of this alternating electrical field likewise has a field gradient which is oriented in the direction of the web opening 100. Because of this field distribution of the alternating electrical field in the drainage channel 50, there is a certain pumping force that opposes the pumping direction 120; specifically, so to speak, liquid 20 is pumped back from the drainage channel 50 in the direction of the web 100.
- the field gradient in the pump chamber 10 in the direction of the web opening is greater than the field gradient of the alternating electrical field in the drainage channel 50 in Direction to the bridge opening 100, so that the pumping action along the pumping direction 120 predominates and the liquid 20 from the
- FIG. 1b shows a cross section of the pump according to FIG. 1a along the section AA.
- the two electrodes 70 and 80 can be seen, between which the pump chamber 10, the dielectric web 90 and the drainage channel 50 are arranged.
- the pumping action in the pumping chamber according to FIGS. 1a and 1b can also be increased and / or the direction of pumping can be changed if there are additional particles or cells (objects) in the liquid 20 to which a dielectrophoretic force is exerted and which are therefore move along the field gradient within the pump chamber and additionally entrain the liquid 20.
- the pumping effect within the pumping chamber 10 can be increased if heating or cooling elements are arranged on or in the pumping chamber, with which the local elements caused by the field strength gradient
- Temperature distribution within the pump chamber 10 is further increased; because the pumping action of the pumping chamber 10 according to FIGS. 1a and 1b is based, as already explained above, on the fact that there is a location-dependent temperature profile within the pumping chamber, which leads to inhomogeneous dielectric properties of the liquid 20 and induces space charges which interact with the electrical alternating field occur and exert a pumping force on the liquid 20.
- a second exemplary embodiment for a pump is shown in FIGS. 2a and 2b. It can be seen in FIG. 2a that the dielectric element 90 has an opening 100 which is wedge-shaped. The wedge-shaped course of the opening 100 is straight wedge-shaped.
- the field gradient of the alternating electrical field is stationary and time-independent and increases in the pumping direction 120 and thus in the direction of the web opening 100.
- the lower end of the web opening 100 in FIG. 2a forms the outflow opening 40 of the pump chamber 10. This outflow opening 40 is followed by the outflow channel 50, which is connected to the further outflow opening 60 of the pump 1.
- FIG. 2b shows the pump according to FIG. 2a in cross section along section AA.
- the pump chamber 10, the dielectric element 90 and the drainage channel 50 can be seen in FIG. 2b.
- FIGS. 3a and 3b show a third exemplary embodiment for a pump.
- the dielectric web 90 is wedge-shaped Provide web opening 100 that the drain opening 40 of the
- Drain opening 60 arrives.
- the further electrode 80 is not formed by an electrode plate which is parallel to the first electrode plate 70. Rather, the second electrode plate 80 is an electrode rod or an electrode plate that is preferably perpendicular to the first electrode plate 70.
- the second electrode 80 Due to the design of the second electrode 80, in the exemplary embodiment according to FIG. 3a, there is no field gradient within the drainage channel 50, by which a pump effect counteracting the pumping direction 120 could be formed in the drainage channel 50.
- the pumping action in the electrode arrangement according to FIG. 3a is thus larger than, for example, the electrode arrangement according to FIG. 2a.
- FIG. 3b shows a cross section through the pump according to FIG. 3a.
- the drainage channel 50 can be seen with the second electrode 80, which is formed by a kind of bead on the chamber floor of the pump.
- FIGS. 4a and 4b A fourth exemplary embodiment of a pump is shown in FIGS. 4a and 4b.
- the pump has an inflow opening 30, which is opposite the outflow opening 40 was present in the embodiments according to FIGS. 1 to 3, is missing in the embodiment according to FIGS. 4a and 4b.
- the pump 1 has a dielectric element 90 which is formed by two parts 90 'and 90' 'which are triangular in the plan view according to FIG. 4a. Due to the triangular shape of the two parts 90 ′ and 90 ′′ of the dielectric element 90 in the plan view, the pump chamber 10 has a funnel-shaped course in the plan view, which opens towards the drain opening 40.
- FIG. 4b shows the pump chamber according to FIG. 4a along the section AA. It can be seen in FIG. 4a that the two electrodes 70 and 80 are formed by bead-shaped elements which are fastened or arranged on one of the chamber walls 5 of the pump 1.
- FIGS. 5a and 5b A fifth exemplary embodiment of a pump 1 is shown in FIGS. 5a and 5b.
- the pump 1 has two pumping chambers 10 'and 10' ', each of which is equipped with an inlet opening 30' or 30 ''.
- the two pumping chambers 10 'and 10' ' share a common drain opening 40 through which they each pump the liquid 20 out of their chamber.
- the pumping force required for pumping along the two pumping directions 120 ′ and 120 ′′ is generated by an alternating electrical field, which is caused by a first electrode 70 and a second electrode 80.
- the two electrodes 70 and 80 are formed by two curved electrode plates, which face each other with their concave surfaces.
- the pump 1 is equipped with two dielectric elements 90 'and 90' ', each of which has a semicircular shape in the plan view shown in FIG. 5a. Due to the two dielectric elements 90 ′ and 90 ′′, a field gradient occurs in each of the two pumping chambers 10 ′ and 10 ′′ along the pumping direction 120 ′ or 120 ′′, through which the liquid 20 in the direction of the discharge opening 40 is pumped out from both pumping chambers.
- FIG. 5b shows the pump chamber according to FIG. 5a in a cross section along the section line AA.
- the upper inflow opening 30a, the outflow opening, can be seen 40, the dielectric element 90 ′′ and the two pumping chambers 10 ′ and 10 ′′.
- FIGS. 6a and 6b A sixth exemplary embodiment of a pump 1 is shown in FIGS. 6a and 6b.
- the sixth embodiment differs from the fifth embodiment in the configuration of the electrode device and the dielectric elements.
- the sixth exemplary embodiment has a third electrode 200 which is arranged in the middle of a drainage channel 50.
- Dielectric elements 90 ′, 90 ′′, 91 ′ and 91 ′′ are arranged on both sides of the drainage channel 50 and are quarter-circle-shaped in plan view.
- Two pumping chambers 10 ′ and 10 ′′ are formed by the outflow channel 50, each of which is connected to the outflow channel 50 with its respective outflow opening 40 ′ and 40 ′′.
- the two electrodes 70 and 80 are connected in parallel and thus acted on with the same potential.
- the counter electrode to the two electrodes 70 and 80 thus forms the third electrode 200.
- a field gradient occurs in each of the two pumping chambers 10 'and 10' ' electrical alternating field in the direction of the respective outlet opening 40 ′ or 40 ′′ and thus to a pump effect, through which the liquid 20 reaches the outlet channel 50 and thus the outlet opening 60 of the pump 1 from the two inlet openings 30 ′ and 30 ′′.
- FIG. 6b shows the pump according to FIG. 6a again in a section along the section line AA. you recognizes the upper inflow opening 30 ', the upper pump chamber 10', the quarter-circular dielectric element 90 ', the drain channel 50 with the third electrode 200, the quarter-circular dielectric element 91''and the lower pump chamber 10''of the pump 1 the chamber walls 5 of the pump chamber 1 can be seen.
- FIGS. 7a and 7b A seventh exemplary embodiment of a pump is shown in FIGS. 7a and 7b.
- An upper pump chamber 10 ' can be seen with dielectric elements 90' and 90 '', which form a wedge-shaped drain opening 40 'of the pump chamber 10'.
- a lower pump chamber 10 ′′ can be seen with dielectric elements 91 ′ and 91 ′′, which form a drain opening 40 ′′.
- the two drain openings 40 ′ and 40 ′′ are connected to a drain channel 50 which has a further drain opening 60.
- the pump according to FIG. 7a is equipped with a flat electrode plate 70, which is opposite a second flat electrode plate 80.
- a third electrode plate 200 is arranged between the two electrode plates 70 and 80 and is located in the center of the drainage channel 50.
- the two electrodes 70 and 80 are connected in parallel and acted on with the same potential.
- the counter electrode is formed by the third electrode 200, to which a potential is applied such that an alternating electric field is formed between the first electrode 70 and the third electrode 200 and an alternating field between the second electrode 80 and the third electrode 200.
- the two pumping chambers each have an inflow opening 30' and 30 ''.
- FIG. 7b shows the pump chamber according to FIG. 7a again in section along the line AA.
- 7b shows the second electrode 80, the lower pump chamber 10 ′′, the dielectric element 91 ′, the drainage channel 50, the third electrode 200, the dielectric element 90 ′, the upper pump chamber 10 ′ and the first electrode 70.
- the chamber walls 5 of the pump 1 are shown in FIG. 7b.
- FIGS. 8a and 8b An eighth exemplary embodiment of a pump is shown in FIGS. 8a and 8b.
- Two pumping chambers 10 'and 10' ' can be seen, which are connected “in parallel”.
- Both pumping chambers 10 ′ and 10 ′′ pump the liquid 20 entering the two pumping chambers 10 ′ and 10 ′′ at the inflow opening 30 in the direction of their respective Drain openings 40 ′ and 40 ′′ and thus in the drain channel 50 connected to the two drain openings 40 ′ and 40 ′′. From the drain channel 50, the liquid 20 then reaches the further drain opening 60, through which the liquid emerges from the pump 1 ,
- the pump 1 is equipped with dielectric elements 90 ', 90''and90''' which are used for the two drain openings 40 '. and 40 '' each form a wedge-shaped drain opening. Due to the design of the three dielectric elements 90 ', 90''and90''', a field profile of the alternating electrical field is formed within the two pumping chambers 10 'and 10'', which is oriented in the pumping direction 120' and 120 ''.
- FIG. 8b shows the pump according to FIG. 8a in cross section.
- FIGS. 9a and 9b A ninth exemplary embodiment of a pump 1 is shown in FIGS. 9a and 9b.
- An upper pump chamber 10 ' can be seen, which is connected in series with a lower pump chamber 10''.
- the liquid pumped through the inflow opening 30 of the pump 1 into the upper pump chamber 10' passes from the upper pump chamber 10 'through the outflow opening 40 'of the upper pump chamber 10' to the lower pump chamber 10 '', from where the liquid is pumped to the drain opening 40 '' of the lower pump chamber 10 ".
- the drain opening 40" simultaneously forms the outflow opening of the pump chamber 1.
- Alternating field electrodes 70 and 80 The electrode 80 belongs at the same time to the second pump chamber 10 ′′ and additionally works together with the third electrode 200 of the lower pump chamber 10 ′′.
- the pumping forces of the two pumping chambers 10 ′ and 10 ′′ add up, so that a large pumping action, oriented in the pumping direction 120 ′ or 120 ′′, is achieved at the outflow opening of the pump 1 formed by the outflow opening 40 ′′ .
- the electrodes 70, 80 and 200 are activated, for example, in such a way that the two electrodes 70 and 200 are at the same potential - for example OV - and the electrode 80 is at a different potential - e.g. + 33V - lie.
- the ninth exemplary embodiment is shown again in cross section in FIG. 9b.
- the first electrode 70, the upper pump chamber 10 ', the dielectric element 90' of the upper pump chamber 10 ', the electrode 80 and the lower pump chamber 10' can be seen, in front of the drain opening 40 '' of which the third electrode 200 is arranged.
- FIGS. 10a to 10c A tenth embodiment of a pump is shown in FIGS. 10a to 10c.
- This pump has two pumping chambers 10 'and 10' ', the pumping directions of which are shown by the arrows 120' and 120 ''.
- FIG. 10a (top view) shows the electrical field lines of the electrical alternating field prevailing within the pump and the equipotential lines 110.
- the electric field strength is marked in a vector representation with vector arrows E.
- a potential of 33 V is present at the upper electrode 70 in FIG. 10a.
- a voltage of 0 V is present at the lower electrode 80.
- the field course was simulated with a simulation program.
- the liquid 20 (in the present case water) is pumped in a circle. Specifically, the liquid 20 is pumped downward from the right pump chamber 10 'along the direction of the arrow 120', from where the liquid then reaches the left pump chamber 10 ''. The left 10 ′′ in turn pumps the liquid 20 upwards along the arrow direction 120 ′′ and thus to the right pump chamber 10 ′.
- FIG. 10b shows a top view of the pump according to FIG. 10a;
- FIG. 10c shows the pump in a side view.
- the length specifications are in micrometers.
- FIG. 10c shows two filler neck 300 with which the liquid 20 can be filled into the two pumping chambers 10 'and 10' '.
- FIG. 10c shows a coaxial conductor 310 with which the alternating electrical field can be applied to the pump.
- a cover glass 320 can be seen in FIG. 10c, which closes off the pump at the top.
- the pump 1 is arranged, for example, on a glass plate, a silicon wafer or a polymer wafer as a base plate, on which glass layers are applied as chamber wall material and dielectric web elements.
- a platinum wire with a diameter of 0.2 mm can be used as the electrode connection material for connecting the coaxial conductor 310 to the pump 1.
- the pump 1 according to FIGS. 10a to 10c forms an electrical capacitor with a capacitance of approximately 190 nF. Alternating voltages with a frequency between 1 Hz and 52 MHz are particularly suitable for operating the pump.
- the pump behavior of the pump according to FIGS. 10a to 10c corresponds to the diagram according to FIG. 11, which had already been explained in detail above.
- the diagram according to FIG. 11 shows the velocities of liquids (solutions) with different conductivities depending on the frequency of the alternating field applied at an alternating voltage of 33 V.
- the flow rate of the liquid 20 was always measured in the narrowest area of the funnel-shaped openings 40 'or 40' '.
- Glass can, for example, be used as the chamber wall material in the pumps explained in connection with FIGS. 1 to 10. Glass can also be used as a material for the dielectric elements.
- the pumping direction u. U "turned over" by changing the frequency of the alternating field applied.
- a pumping direction can also be set in each case, which is opposite to the pumping directions 120, 120 'or 120' 'shown in the figures.
- the pumping direction explained in connection with FIGS. 1 to 10 is therefore only to be understood as an example.
- the pumping direction depends on the material parameters of the respective liquid and on the frequency of the alternating field applied.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Reciprocating Pumps (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10329979A DE10329979A1 (de) | 2003-06-27 | 2003-06-27 | Pumpe mit mindestens einer Pumpkammer |
PCT/DE2004/001380 WO2005001286A1 (de) | 2003-06-27 | 2004-06-24 | Pumpe mit mindestens einer pumpkammer und elektroden zum erzeugen eines elektrischen wechselfeldes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1646789A1 true EP1646789A1 (de) | 2006-04-19 |
EP1646789B1 EP1646789B1 (de) | 2006-12-27 |
Family
ID=33521290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04738826A Expired - Lifetime EP1646789B1 (de) | 2003-06-27 | 2004-06-24 | Pumpe mit mindestens einer pumpkammer und elektroden zum erzeugen eines elektrischen wechselfeldes |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1646789B1 (de) |
AT (1) | ATE349615T1 (de) |
DE (2) | DE10329979A1 (de) |
WO (1) | WO2005001286A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006009424A1 (de) * | 2006-02-24 | 2007-09-06 | Universität Rostock | Elektrohydrodynamische Mikropumpe und deren Verwendung |
CA2604623C (en) | 2006-09-28 | 2018-10-30 | Tyco Healthcare Group Lp | Portable wound therapy system |
US9427505B2 (en) | 2012-05-15 | 2016-08-30 | Smith & Nephew Plc | Negative pressure wound therapy apparatus |
US10682446B2 (en) | 2014-12-22 | 2020-06-16 | Smith & Nephew Plc | Dressing status detection for negative pressure wound therapy |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1109545A (en) * | 1976-05-08 | 1981-09-22 | Nissan Motor Co., Ltd. | Electrostatic apparatus for controlling flow rate of liquid |
DE3925749C1 (de) * | 1989-08-03 | 1990-10-31 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De | |
DE4117914A1 (de) * | 1991-05-31 | 1992-12-03 | Fraunhofer Ges Forschung | Mikrominiaturisierte elektrostatische pumpe |
DE4223019C1 (de) * | 1992-07-13 | 1993-11-18 | Fraunhofer Ges Forschung | Ventillose Mikropumpe |
US5964997A (en) * | 1997-03-21 | 1999-10-12 | Sarnoff Corporation | Balanced asymmetric electronic pulse patterns for operating electrode-based pumps |
FR2794039B1 (fr) * | 1999-05-27 | 2002-05-03 | Osmooze Sa | Dispositif de formation, de deplacement et de diffusion de petites quantites calibrees de liquides |
US6287440B1 (en) * | 1999-06-18 | 2001-09-11 | Sandia Corporation | Method for eliminating gas blocking in electrokinetic pumping systems |
DE10103399A1 (de) * | 2001-01-26 | 2002-08-22 | Bosch Gmbh Robert | Mikromechanisches Bauelement und entsprechendes Herstellungsverfahren |
-
2003
- 2003-06-27 DE DE10329979A patent/DE10329979A1/de not_active Withdrawn
-
2004
- 2004-06-24 WO PCT/DE2004/001380 patent/WO2005001286A1/de active IP Right Grant
- 2004-06-24 AT AT04738826T patent/ATE349615T1/de not_active IP Right Cessation
- 2004-06-24 DE DE502004002473T patent/DE502004002473D1/de not_active Expired - Lifetime
- 2004-06-24 EP EP04738826A patent/EP1646789B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2005001286A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005001286A1 (de) | 2005-01-06 |
DE502004002473D1 (de) | 2007-02-08 |
DE10329979A1 (de) | 2005-01-20 |
ATE349615T1 (de) | 2007-01-15 |
EP1646789B1 (de) | 2006-12-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE102007047415B3 (de) | Flüssigkeitsverdampfer | |
DE102009028493A1 (de) | Mikrofluidische Zelle | |
WO1991002375A1 (de) | Mikrominiaturisierte elektrostatische pumpe | |
EP0497077A1 (de) | Vorrichtung zur Vorbereitung von Proben insbesondere für Analysezwecke | |
WO2013117603A1 (de) | Pumpe mit integrierter heizung | |
DE19861106B4 (de) | Ionisierungskammer für ein Ionenmobilitätsspektrometer (IMS) | |
EP1565266A1 (de) | Fluidisches mikrosystem mit feldformenden passivierungsschichten auf mikroelektroden | |
DE102009028496A1 (de) | Mikrofluidische Zelle | |
EP1646789B1 (de) | Pumpe mit mindestens einer pumpkammer und elektroden zum erzeugen eines elektrischen wechselfeldes | |
AT517234B1 (de) | Gerät zur Verstärkung oder Umkehr eines geo-gravomagnetischen Feldes | |
DE3020457A1 (de) | Vorrichtung und verfahren zum elektrischen trennen von emulsionen | |
EP1880980A1 (de) | Vorrichtung zum elektromagnetischen Entsalzen von Meerwasser | |
WO2007098910A1 (de) | Elektrohydrodynamische mikropumpe und deren verwendung | |
DE1470610A1 (de) | Elektrische Behandlungsvorrichtung | |
EP1941216B1 (de) | Verfahren und vorrichtung zur physikalischen wärmebehandlung von flüssigen medien | |
DE3509895C2 (de) | ||
DE102018133341A1 (de) | Heizeinheit für elektrisch leitfähiges flüssiges Heizmedium, Elektrode für eine solche Heizeinheit sowie entsprechende Heizvorrichtung und Heizkreislauf | |
DE8332914U1 (de) | Elektrisch beheizter durchlauferhitzer | |
DE1179912B (de) | Einrichtung zur elektrischen Emulsions-trennung | |
EP0610723A1 (de) | Vorrichtung zur Behandlung einer Flüssigkeit und Verfahren zur Verlängerung der Lebensdauer einer solchen Vorrichtung | |
EP3712902A1 (de) | Filtersystem zur lokalen abschwächung von röntgenstrahlung, röntgenapparat und verfahren zur lokalen veränderung der intensität von röntgenstrahlung | |
DE1420894C (de) | Vorrichtung zum elektrischen Brechen und/oder Entsalzen von Wasser-in-Öl-Emulsionen | |
CH574176A5 (de) | ||
DE4022170C2 (de) | ||
DE2757854A1 (de) | Vorrichtung und verfahren zum entkeimen von fluessigkeiten |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20060117 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HOLTAPPELS, MORITZ Inventor name: GIMSA, JAN |
|
DAX | Request for extension of the european patent (deleted) | ||
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20061227 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: IE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
REF | Corresponds to: |
Ref document number: 502004002473 Country of ref document: DE Date of ref document: 20070208 Kind code of ref document: P |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070327 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070327 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070407 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070528 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 20061227 |
|
EN | Fr: translation not filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 |
|
26N | No opposition filed |
Effective date: 20070928 |
|
BERE | Be: lapsed |
Owner name: UNIVERSITAT ROSTOCK Effective date: 20070630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070817 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070328 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070624 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080630 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070624 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070628 Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061227 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20120615 Year of fee payment: 9 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 502004002473 Country of ref document: DE Effective date: 20140101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140101 |