EP2220371B1 - Pump arrangement having safety valve - Google Patents
Pump arrangement having safety valve Download PDFInfo
- Publication number
- EP2220371B1 EP2220371B1 EP07846798A EP07846798A EP2220371B1 EP 2220371 B1 EP2220371 B1 EP 2220371B1 EP 07846798 A EP07846798 A EP 07846798A EP 07846798 A EP07846798 A EP 07846798A EP 2220371 B1 EP2220371 B1 EP 2220371B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- inlet
- arrangement
- outlet
- valve
- 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.)
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Links
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 230000002572 peristaltic effect Effects 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 description 53
- 239000012528 membrane Substances 0.000 description 31
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012377 drug delivery Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000003444 anaesthetic effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Images
Classifications
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- 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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
-
- 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
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/14—Machines, pumps, or pumping installations having flexible working members having peristaltic action having plate-like flexible members
-
- 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
- F04B49/10—Other safety measures
Definitions
- Embodiments of the invention relate to a pump arrangement and in particular to a pump arrangement which has a safety valve at a pump outlet of a pump.
- Diaphragm pumps with passive check valves at the pump inlet and at the pump outlet are, for example, the DE-A-19719862 known.
- Peristaltic pumps without active valves are for example from DE-A-10238600 known.
- micropumps which can be understood as meaning those pumps whose pumping volume is in the microliter range or less with a single actuation.
- micropumps have a problem in that free flow through the pump can take place when an overpressure is applied to the inlet reservoir connected to the respective pump inlet and no operating voltage is applied to the pump.
- Normally closed, self-blocking valves are out of the DE-A1-10048376 and the WO-A1-2004 / 081390 known. Under a normally closed valve is a valve to understand that is closed in the unactuated state.
- the DE-A1-10048376 discloses a normally closed self-blocking valve in which a positive pressure acts on a valve inlet closing.
- the valve comprises a piezoceramic, wherein the application of a voltage to the piezoceramic results in an opening of the valve.
- the advantage of such a valve is the self-blocking function, even with an overpressure at the inlet, as well as the simple structure. If you wanted to combine such a valve with a pump, To avoid a free flow, this leads by the required separate component to an increased space and cost requirements. Furthermore, a separate piezo drive is required.
- valve outlet is fluidly coupled to the inlet of a downstream micropump.
- the valve is formed in a valve chip which has a self-blocking function when an overpressure is applied to the inlet of the valve, which has a self-blocking function when an overpressure is applied to the outlet of the valve, and the valve Valve opens when a vacuum is applied to the outlet.
- the pump When the pump is turned on, it creates a vacuum at the pump inlet and the valve outlet, which opens the valve.
- Such a microvalve provides a self-blocking function, has passive components, so that no piezo actuation is needed and thus has a very good element-to-element reproducibility.
- micropump with integrated double normally closed microvalve has a compact design and a small dead volume.
- the design of the pump is designed for a sufficiently high compression ratio.
- the pump chip required is large, and at high inlet pressures, the pump may not be able to reach the negative pressure needed to open the integrated double normally closed microvalve.
- a medication metering device which comprises a pump and at the outlet of the pump a safety valve.
- An embodiment of this document teaches a diaphragm pump with passive ball check valves at a pump inlet and a pump outlet.
- a safety valve is provided which has a valve seat and a diaphragm acting as a valve.
- One face of this membrane is fluidly connected to an inlet reservoir of the pump assembly so that pressure in that inlet reservoir acts on that side of the membrane.
- the other surface of the membrane is connected via the check valve at the outlet of the pump to the pressure generated in a pumping chamber of the pump.
- the safety valve when the pump is off, the safety valve is pressure compensated over almost the entire diaphragm size, but not in the area within the safety valve seat.
- the advantage of a safety valve connected in series with the outlet of a micropump is that a positive pressure at the pump inlet acts to close the safety valve.
- a relatively small overpressure generated at the pump outlet can open the safety valve.
- the in the WO-A-03/099351 described pump assemblies are disadvantageous in that separate components are needed, which in turn leads to increased space and cost requirements. Furthermore, the pump assemblies have a large dead volume, which in turn fluid connections are needed.
- a safety valve is integrated directly with a pump.
- the valve seat of the safety valve, the pump outlet and the pump inlet are structured in a first surface of an integral part of the pump assembly. Characterized in that the outlet of the pump and the valve seat are formed in the same surface of a one-piece part, the valve seat of the safety valve can be formed directly at the outlet of the pump, which in addition to a simple structure, a small dead volume can be obtained.
- the pump inlet is structured in the same surface and fluidly connected to a fluid region of the pump assembly which acts on the safety valve. This makes it possible to implement the pump arrangement according to the invention with a simple structure.
- the second integral part of the pump assembly is a layer of substantially uniform thickness disposed between and separating the first one-piece part and the third part.
- This second integral part may have at least one opening through which the pump inlet is fluidically connected to the fluid area, which is an inlet fluid area of the pump arrangement.
- the second integral part may have another opening through which an outlet of the safety valve is fluidly connected to the outlet of the pump assembly.
- the second one-piece part may be formed only in the area of the safety valve.
- Embodiments of pump arrangements according to the invention can be implemented with different pumps, for example diaphragm pumps with passive check valves at the pump inlet and at the pump outlet or peristaltic pumps.
- Embodiments of the present invention are particularly suitable for implementing micropumps in which a pumping volume pumped during a pumping cycle may be in the microliter range and below.
- relevant dimensions of such a micropump such as pump stroke of a pumping membrane or thickness of a pumping membrane, may be in the micrometer range.
- the present invention provides a pump assembly in which a pump and a safety valve are integrated in a component which may be implemented with a small number of parts.
- a pump assembly element may be implemented, which is formed of five or six individual parts or layers, wherein a pumping membrane part with associated piezoceramic and corresponding terminals is considered as a part.
- Embodiments of the present invention provide a pump assembly chip constructed of a plurality of stacked structured layers forming a pump and a safety valve integrated with the pump outlet. In embodiments of the invention thus no separate fluidic connections between the pump and the valve are required. Thus, in embodiments of the invention both a dead volume and a space requirement can be minimized. embodiments In addition to a simple design, the invention enables a saving in terms of size, weight and costs.
- an overpressure at the pump arrangement inlet acts closing on the safety valve, so that in the unactuated state, a flow in the direction from the inlet to the outlet can be effectively avoided.
- FIG. 1a and 1b An embodiment of a pump arrangement according to the invention will now be described, in which a pump is implemented by a micromembrane pump with passive check valves.
- the pump arrangement comprises five structured layers, which are arranged one above the other and attached to one another. These layers are referred to below as first layer 10, second layer 12, third layer 14, fourth layer 16 and fifth layer 18.
- the pump arrangement shown has a diaphragm pump 20 with a pump inlet 22 and a pump outlet 24.
- the pump inlet 22 and the pump outlet 24 are structured in the lower surface of the third layer 14.
- the diaphragm pump 20 includes a passive check valve at the pump inlet 22, which has a valve seat 26 and a valve flap 28.
- the valve seat 26 is patterned in the upper surface of the third layer 14, and the valve flap 28 is patterned in the fourth layer 16.
- the micropump 20 further includes a passive check valve at the pump outlet 24, which has a valve seat 30 and a valve flap 32.
- the valve seat 30 is structured in the fourth layer 16 and the valve flap 32 is structured in the upper surface of the third layer 14.
- the diaphragm pump 20 further includes a pumping membrane 34 which is structured in the fifth part 18.
- a piezoceramic 36 is mounted, so that a volume of a pumping chamber 38 of the diaphragm pump 20 can be varied by operating the same.
- suitable means (not shown) for applying a voltage to the piezoceramic 36 are provided, through which the pumping membrane 34 from the position shown in FIG Fig. 1a is shown, can be deflected into a position in which the volume of the pumping chamber 38 is reduced.
- FIG. 1a shown embodiment of a pump assembly according to the invention has a safety valve 40 on the pump outlet 24.
- the safety valve 40 includes a safety valve seat 42 and a safety valve door 44.
- the safety valve seat 42 is structured in the lower surface of the third layer 14.
- the safety valve flap 44 is formed by a portion of the second layer 12 that faces the safety valve seat 42.
- the third layer 14 west in the lower surface thereof has a recess 62 defining the movable part of the second layer 12.
- the pump assembly shown includes a pump assembly inlet 46 and a pump assembly outlet 48.
- the pump assembly inlet 46 is connected to a fluid region 50.
- the pump assembly inlet 46, the pump assembly outlet 48, and the fluid region 50 are structured in the first layer 10.
- the fluid region 50 adjoins the underside of the second layer 12, so that a pressure prevailing in the fluid region 50 acts closing on the safety valve 40.
- the fluid region 50 and thus the pump assembly inlet 46 are fluidly connected to the pump inlet 22 via a first opening 52 in the second layer 12.
- the pump outlet 48 is fluidly connected via a second opening 54 in the second layer 12 to a fluid channel 56, which in turn is fluidically connected to the safety valve 40 and an outlet 58 of the safety valve, respectively.
- the fluid channel 56 is formed in the illustrated embodiment by appropriate structuring in the third layer 14 and the fourth layer 16.
- the outlet of the safety valve is structured in the upper surface of the third layer 14.
- the pump assembly inlet 46 and the pump assembly outlet 48 may be provided with suitable fluid connectors that facilitate connection of further fluidic structures, such as so-called luer connectors for connecting tubing and the like.
- Fig. 1b shows the structures formed in the bottom of the third layer 14, the pump inlet 22, the pump outlet 24, the safety valve seat 42 and a structured in the lower surface of the third layer 14 outlet-side end 60 of the fluid channel 56 include.
- the fluid channel 56 is in Fig. 1b indicated by dashed lines.
- Above the pump outlet 24 is in Fig. 1b to recognize the valve flap 32 of the check valve at the outlet of the micropump.
- Fig. 1b in dashed lines the position and arrangement of the pumping membrane 34 indicated.
- the recess represented a safety valve chamber 62, which is structured in the underside of the third layer 14, and has a substantially square shape in the illustrated embodiment.
- an optional spacer structure 64 may be provided for the same by means of regularly distributed supports in Fig. 1b is indicated.
- This spacer structure used in Fig. 1a is not shown, may be formed by projections in the third layer 14, which may have the same height as the safety valve seat 42.
- the protrusions may be made using the same process steps, for example, the same etching step as the safety valve seat 42.
- the spacer structure may be configured to reduce or substantially prevent sagging of the safety valve flap toward the third layer 14 when the pressure at the pump assembly inlet 46 is high. As a result, leaks due to a deflection of the safety valve flap 44 can be prevented. Further, the diaphragm forming the safety valve flap 44 is thereby subjected to lower stresses, whereby the durability thereof can be increased.
- the piezoceramic 36 may be periodically energized, for example by a pulsed square wave voltage. Depending on the frequency of the applied actuating voltage and a stroke volume of the pumping membrane 34 thus a desired delivery rate can be achieved.
- the pressure acts from below on the entire movable flap surface, while the pressure from above on the area covered by the valve seat 42 does not work. Thereby, a free flow at a positive pressure at the pump assembly inlet in the non-actuated state can be securely prevented.
- FIG. 2 A modification of the in the Fig. 1a and 1b shown embodiment is in Fig. 2 are shown, wherein like elements are designated by like reference numerals and further description of these elements is omitted.
- the pumping membrane 34 at the bottom of the same elevations 34a, 34b, which protrude into the pumping chamber.
- the fourth layer 16, compared with the in FIG Fig. 1a shown an example projecting into the pumping chamber 38 increase 66.
- the pumping membrane 34 is shown in the actuated state.
- the elevations 34a, 34b may be formed in the edge area of the pumping membrane 34a, 34b.
- the elevations 34a, 34b and 66 result in a reduction in the dead volume of the pumping chamber 38, which in turn results in an increase in the compression ratio of the pump. Operation of in Fig. 2 shown pump assembly corresponds to the operation of the above with reference to the Fig. 1a and 1b described embodiment.
- the pump arrangement shown comprises five layers 110, 112, 114, 116 and 118, which are arranged one above the other and attached to each other.
- the pump assembly includes a pump having a pump inlet 122 and a pump outlet 124.
- the pump inlet 122 and the pump outlet 124 are structured in the lower surface of the third layer 114.
- a recess is formed, in which a check valve module 126 is arranged.
- the check valve module 126 may be glued, for example, in the recess.
- the check valve module 126 may, for example, have a structure as shown in FIG DE-A-19719862 is described.
- the upper surface of the third layer 114 is further patterned to define a pumping chamber 130 together with the underside of a pumping membrane 128 formed by the fourth layer 116.
- the pumping membrane 128 may be formed, for example, by a metal layer, such as a stainless steel foil.
- a piezoceramic 132 is arranged on the pumping diaphragm 128, a piezoceramic 132 is arranged. A voltage can be applied to the piezoceramic 132 via corresponding connection devices, which are shown schematically at 134, in order to actuate the pumping membrane 128.
- the pumping membrane 128 Upon actuation, the pumping membrane 128 is deflected downwardly so that the volume of the pumping chamber 130 is reduced.
- the contour of the pumping membrane 128 facing surface of the third layer 114 is adapted to the contour of the pumping diaphragm 128 in the deflected state, so that a dead volume of the pump can be reduced and thus a compression ratio thereof can be increased.
- a cover 136 is provided in the example shown, which is formed by a corresponding structuring of the fifth layer 118.
- the illustrated pump assembly further includes a safety valve 140 having a safety valve seat 142 and a safety valve door 144.
- the safety valve seat 142 is structured in the bottom of the third layer 114.
- the safety valve flap 144 is formed by a movable part of the second layer 112.
- the movable part of the second layer 112 is in turn defined by a corresponding recess in the bottom of the third layer 114.
- the pump assembly includes a pump assembly inlet 146 and a pump assembly outlet 148.
- the pump assembly inlet 146 is structured in the first layer 110 and fluidly connected to a fluid region 150, which is also structured in the first layer 110.
- the fluid region 150 adjoins the underside of the safety valve flap 144, so that an overpressure prevailing at the inlet 146 acts on the underside of the valve flap 144.
- the pump assembly outlet 148 is fluidly connected to an outlet 158 of the safety valve 140 via a fluid passage 156.
- the movable safety valve flap 44 is not attached to the valve seat 142, so that a pressure acting on the top of the valve flap prevailing on the underside of the valve flap opening acts on the safety valve.
- the check valve module 100 provides a check valve at the pump inlet 122 and a check valve 124 at the pump outlet.
- An overpressure in the pumping chamber 130 acts to close the check valve at the pump inlet 122 and to open the check valve at the pump outlet 124, while a negative pressure in the pumping chamber 130 acts to open the check valve at the pump inlet 122 and to close the check valve at the pump outlet 124.
- the pump assembly inlet 146 and the pump assembly outlet 148 may be configured to facilitate connection of fluid tubing or the like.
- the pump inlet 122 is fluidly connected to the fluid area 150 via an opening 152 in the second layer 112.
- the fourth layer 116 may be formed by a metal foil with a piezoceramic applied thereto.
- the check valve module 126 may be silicon-structured microvalves exhibit. Such a combination advantageously allows for the implementation of micropumps of small construction and high delivery rate.
- FIG. 3 The pump assembly shown corresponds substantially to the above with reference to the in Fig. 1a shown embodiment described operation.
- a pressure differential created by a pumping stroke in the pumping chamber 130 acts to open the safety valve door 144 so that fluid is pumped out of the pumping chamber through the pumping assembly outlet 148 during such a pumping stroke.
- fluid is drawn through the pump assembly inlet 146 and the check valve at the pump inlet 122 while the check valve at the pump outlet 126 is closed.
- pump overpressure at the pump assembly inlet 146 again acts to close the underside of the safety valve door 144 so that flow through the pump assembly can be safely prevented when the inlet is over-pressurized in the de-energized state.
- FIG. 4 An alternative embodiment of a pump arrangement according to the invention will now be described, which has a peristaltic micropump.
- the pump assembly shown includes a first layer 210, a second layer 212, a third layer 214, a fourth layer 216, and a fifth layer 218.
- the layers 210, 212, 214 and 218 are stacked and attached to each other.
- the layer 216 is disposed on the layer 214, as shown in FIG Fig. 4 is shown arranged in a recess formed in an upper surface of the layer 214.
- the pump assembly shown has a peristaltic micropump 220 that includes a pump inlet 222, a pump outlet 224, a pumping membrane formed by the fourth layer 216, and three piezoelectric actuators 226, 228 and 230.
- An inlet valve seat 232 forms an active inlet valve, along with a portion of diaphragm 216 opposite thereto, while an outlet valve seat 234, along with a portion of diaphragm 216 opposite thereto, provides an active outlet valve.
- the pumping chamber 236 is fluidly connected via fluidic connections 238 to an inlet valve chamber 240 and an outlet valve chamber 242.
- the structure of the peristaltic micropump essentially the structure of a peristaltic micropump, as in the DE-A-10238600 is described correspond.
- the piezoelectric actuators 226, 228 and 230 are connected via respective electrical connections (not shown) to voltage sources and control means, respectively (not shown).
- the individual membrane sections of the membrane 216 can be actuated or deflected downwards in a specific sequence in order to effect a pumping action from the pump inlet 222 to the pump outlet 224, as described, for example, in US Pat DE-A-10238600 is described, the teaching of which is hereby incorporated by reference.
- the pump assembly shown has at the pump outlet 224 of the pump 220 a safety valve 250 having a safety valve seat 252 and a safety valve flap 254.
- the safety valve seat 252 is formed in the lower surface of the third layer 214 while the safety valve flap 254 is formed by a movable portion of the second layer 212.
- the movable part of the second layer 212 is defined by a recess 256 in the bottom of the third layer 214.
- the pump assembly includes a pump assembly inlet 260 and a pump assembly outlet 262.
- the pump assembly inlet 260 is fluidly connected to a fluid region 270 that communicates with the pump inlet 222 via an opening 272 in the second layer 212.
- the fluid assembly outlet 262 is fluidly connected to an outlet 276 of the safety valve 250 via a fluid channel 274.
- the fifth layer 218 is patterned to provide a cover for protecting the diaphragm 216 and the piezoelectric actuators 226, 228 and 230 disposed thereon and the electrical connections therefor.
- the portions of membrane 216 may be operated as shown in FIG DE-A-10238600 is described.
- An overpressure effected during a pumping stroke in the pumping chamber 236 thereby opens the safety valve 250 fluidically connected to the pump outlet 224.
- the present invention thus provides pump assemblies in which fluid flow from the inlet to the outlet can be safely avoided with positive pressure at the inlet, with a simple structure, using a small number of components and with a small gate volume.
- the different parts or layers of embodiments of the pump assemblies of the present invention may be implemented from any suitable materials using any suitable manufacturing method.
- the parts can be made of silicon, with appropriate structuring by wet etching (isotropic) or dry etching (anisotropic) can be generated.
- the parts may be made of plastic and produced by injection molding.
- the layers 12, 14 16 and 18 may be structured of silicon.
- the second layers 12, 112 and 212 may, for example, of an elastic material, such. B. corresponding to thin silicon or rubber.
- the first layers 10, 110 and 210, the third layers 114 and 214 and the fifth layers 118 and 218 may be formed by injection molding from plastic, for example.
- the diaphragm 216 may be made of silicon or other suitable material, for example, to realize together with the actuators 226, 228 and 230 each piezoelectric bending transducers.
- Inventive pump assemblies are suitable for a variety of applications. In the following, only examples are given of applications in which it is important to avoid a free flow at an overpressure at the pump inlet. Such applications, for which embodiments of pump assemblies according to the invention are suitable, include e.g. Methanol feed pumps in fuel cell systems, infusion pumps, implantable drug delivery systems, portable drug delivery systems, respiratory humidification systems, and anesthetic dosage systems.
- a peristaltic micropump with normally open valves allows the implementation of a pump with a high compression ratio, which in turn is advantageous in terms of a bubble-tolerant operation.
- a pump arrangement according to the invention could also comprise a peristaltic micropump with normally closed active valves at the pump inlet and / or pump outlet.
- two separate recesses could be provided in the upper surface of the third layer 114, wherein in a first recess a check valve module for a check valve is mounted on the pump inlet and in a second recess a second check valve module is mounted with a check valve for the pump outlet.
- inventions of the pump assembly according to the invention such as e.g. the second layer 12 and the third layer 14 may be interconnected using any known joining techniques, such as e.g. by gluing, clamping or bonding without bonding.
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- Reciprocating Pumps (AREA)
Abstract
Description
Ausführungsbeispiele der Erfindung beziehen sich auf eine Pumpenanordnung und insbesondere auf eine Pumpenanordnung, die an einem Pumpenauslass einer Pumpe ein Sicherheitsventil aufweist.Embodiments of the invention relate to a pump arrangement and in particular to a pump arrangement which has a safety valve at a pump outlet of a pump.
Membranpumpen mit passiven Rückschlagventilen am Pumpeneinlass und am Pumpenauslass sind beispielsweise aus der
Bekannte Mikropumpen weisen ein Problem dahingehend auf, dass ein freier Fluss durch die Pumpe stattfinden kann, wenn ein Überdruck an das Einlassreservoir, das mit dem jeweiligen Pumpeneinlass verbunden ist, angelegt wird, und keine Betriebsspannung an die Pumpe angelegt ist.Known micropumps have a problem in that free flow through the pump can take place when an overpressure is applied to the inlet reservoir connected to the respective pump inlet and no operating voltage is applied to the pump.
Normal geschlossene, selbst-blockierende Ventile sind aus der
Die
Aus der
Aus der
Aus der
Gemäß der
Es besteht somit ein Bedarf nach einer Pumpenanordnung, bei der in einem unbetätigtem Zustand ein freier Fluss verhindert werden kann, während dieselbe einen einfachen Aufbau besitzen kann und ein geringes Totvolumen liefern kann.There is thus a need for a pump assembly in which, in an unactuated state, free flow can be prevented while it can have a simple construction and provide a low dead volume.
Diese Aufgabe wird durch eine Pumpenanordnung nach Anspruch 1 gelöst.This object is achieved by a pump arrangement according to claim 1.
Die vorliegende Erfindung schafft eine Pumpenanordnung mit folgenden Merkmalen:
- einer Pumpe mit einem Pumpeneinlass und einem Pumpenauslass, die ausgelegt ist, um ein Fluid von dem Pumpeneinlass zu dem Pumpenauslass zu pumpen;
- einem Sicherheitsventil, das zwischen dem Pumpenauslass und einem Auslass der Pumpenanordnung angeordnet ist und einen Ventilsitz und einen Ventildeckel aufweist;
- wobei der Ventilsitz, der Pumpenauslass und der Pumpeneinlass in einer ersten Oberfläche eines ersten einstückigen Teils der Pumpenanordnung strukturiert sind,
- wobei der Ventildeckel in einem zweiten einstückigen Teil der Pumpenanordnung gebildet ist,
- wobei ein Einlass der Pumpenanordnung und ein damit fluidisch verbundener Fluidbereich in einem dritten Teil der Pumpenanordnung gebildet sind,
- und wobei der zweite einstückige Teil derart zwischen dem ersten einstückigen Teil und dem dritten Teil der Pumpenanordnung angeordnet ist, das ein in dem Fluidbereich herrschender Druck schließend auf das Sicherheitsventil wirkt und dass der Pumpeneinlass und der Einlass der Pumpenanordnung fluidisch verbunden sind.
- a pump having a pump inlet and a pump outlet configured to pump fluid from the pump inlet to the pump outlet;
- a safety valve disposed between the pump outlet and an outlet of the pump assembly and having a valve seat and a valve cover;
- wherein the valve seat, the pump outlet and the pump inlet are structured in a first surface of a first integral part of the pump assembly,
- wherein the valve cover is formed in a second integral part of the pump assembly,
- wherein an inlet of the pump assembly and a fluid region fluidly connected thereto are formed in a third part of the pump assembly,
- and wherein the second integral part between the first one-piece part and the third part of the pump assembly is disposed, a pressure prevailing in the fluid region closing pressure acts on the safety valve and that the pump inlet and the inlet of the pump assembly are fluidly connected.
Gemäß Ausführungsbeispielen einer erfindungsgemäßen Pumpenanordnung ist ein Sicherheitsventil direkt mit einer Pumpe integriert. Um einen einfachen Aufbau mit geringen Totvolumen zu ermöglichen, sind der Ventilsitz des Sicherheitsventils, der Pumpenauslass und der Pumpeneinlass in einer ersten Oberfläche eines einstückigen Teils der Pumpenanordnung strukturiert. Dadurch, dass der Auslass der Pumpe und der Ventilsitz in der gleichen Oberfläche eines einstückigen Teils gebildet sind, kann der Ventilsitz des Sicherheitsventils direkt am Auslass der Pumpe gebildet sein, wodurch neben einem einfachen Aufbau ein geringes Totvolumen erhalten werden kann. Bei Ausführungsbeispielen der Erfindung ist ferner der Pumpeneinlass in der gleichen Oberfläche strukturiert und mit einem Fluidbereich der Pumpenanordnung fluidisch verbunden, der auf das Sicherheitsventil schlie-βend wirkt. Dadurch ist es möglich, die erfindungsgemäße Pumpenanordnung mit einem einfachen Aufbau zu implementieren.According to embodiments of a pump arrangement according to the invention, a safety valve is integrated directly with a pump. To allow a simple design with low dead volumes, the valve seat of the safety valve, the pump outlet and the pump inlet are structured in a first surface of an integral part of the pump assembly. Characterized in that the outlet of the pump and the valve seat are formed in the same surface of a one-piece part, the valve seat of the safety valve can be formed directly at the outlet of the pump, which in addition to a simple structure, a small dead volume can be obtained. In embodiments of the invention, further, the pump inlet is structured in the same surface and fluidly connected to a fluid region of the pump assembly which acts on the safety valve. This makes it possible to implement the pump arrangement according to the invention with a simple structure.
Bei Ausführungsbeispielen der Erfindung ist das zweite einstückige Teil der Pumpenanordnung eine Schicht mit im Wesentlichen gleichmäßiger Dicke, die zwischen dem ersten einstückigen Teil und dem dritten Teil angeordnet ist und dieselben trennt. Dieses zweite einstückige Teil kann zumindest eine Öffnung aufweisen, durch die der Pumpeneinlass mit dem Fluidbereich, der einen Einlassfluidbereich der Pumpenanordnung darstellt, fluidisch verbunden ist. Bei Ausführungsbeispielen, bei denen ein Auslassfluidbereich der Pumpenanordnung ebenfalls in dem dritten Teil gebildet ist, kann das zweite einstückige Teil eine weitere Öffnung aufweisen, durch die ein Auslass des Sicherheitsventils mit dem Auslass der Pumpenanordnung fluidisch verbunden ist. Ein zweites einstückiges Teil mit einer im Wesentlichen gleichmäßigen Dicke, die, wie beschrieben, mit Öffnungen versehen sein kann, ermöglicht eine einfache Herstellung einer erfindungsgemäßen Pumpenanordnung mit einer reduzierten Anzahl von Bauteilen. Bei alternativen Ausführungsbeispielen kann das zweit einstückige Teil nur im Bereich des Sicherheitsventils gebildet sein.In embodiments of the invention, the second integral part of the pump assembly is a layer of substantially uniform thickness disposed between and separating the first one-piece part and the third part. This second integral part may have at least one opening through which the pump inlet is fluidically connected to the fluid area, which is an inlet fluid area of the pump arrangement. In embodiments in which an outlet fluid region of the pump assembly is also formed in the third part, the second integral part may have another opening through which an outlet of the safety valve is fluidly connected to the outlet of the pump assembly. A second integral part with a substantially uniform thickness, which, as described, may be provided with openings, allows easy production of a pump assembly according to the invention with a reduced number of components. In alternative embodiments, the second one-piece part may be formed only in the area of the safety valve.
Ausführungsbeispiele erfindungsgemäßer Pumpenanordnungen können mit unterschiedlichen Pumpen implementiert werden, beispielsweise Membranpumpen mit passiven Rückschlagventilen am Pumpeneinlass und am Pumpenauslass oder peristaltischen Pumpen. Ausführungsbeispiele der vorliegenden Erfindung eignen sich insbesondere zur Implementierung von Mikropumpen, bei denen ein während eines Pumpzyklus gepumptes Pumpvolumen im Mikroliterbereich und darunter liegen kann. Ferner können relevante Abmessungen einer solchen Mikropumpe, wie beispielsweise Pumphub einer Pumpmembran oder Dicke einer Pumpmembran, im Mikrometerbereich liegen.Embodiments of pump arrangements according to the invention can be implemented with different pumps, for example diaphragm pumps with passive check valves at the pump inlet and at the pump outlet or peristaltic pumps. Embodiments of the present invention are particularly suitable for implementing micropumps in which a pumping volume pumped during a pumping cycle may be in the microliter range and below. Furthermore, relevant dimensions of such a micropump, such as pump stroke of a pumping membrane or thickness of a pumping membrane, may be in the micrometer range.
Die vorliegende Erfindung schafft eine Pumpenanordnung, bei der eine Pumpe und ein Sicherheitsventil in einem Bauteil integriert sind, das mit einer geringen Anzahl von Teilen implementiert sein kann. Bei Ausführungsbeispielen der Erfindung kann ein Pumpenanordnungselement implementiert sein, das aus fünf oder sechs einzelnen Teilen bzw. Schichten gebildet ist, wobei dabei ein Pumpmembranteil mit zugehöriger Piezokeramik sowie entsprechenden Anschlüssen als ein Teil betrachtet wird.The present invention provides a pump assembly in which a pump and a safety valve are integrated in a component which may be implemented with a small number of parts. In embodiments of the invention, a pump assembly element may be implemented, which is formed of five or six individual parts or layers, wherein a pumping membrane part with associated piezoceramic and corresponding terminals is considered as a part.
Ausführungsbeispiele der vorliegenden Erfindung schaffen einen Pumpenanordnungs-Chip, der aus mehreren übereinander angeordneten, strukturierten Schichten aufgebaut ist, die eine Pumpe und ein am Pumpenauslass integriertes Sicherheitsventil bilden. Bei Ausführungsbeispielen der Erfindung sind somit keine separaten fluidischen Verbindungen zwischen Pumpe und Ventil erforderlich. Somit kann bei Ausführungsbeispielen der Erfindung sowohl ein Totvolumen als auch ein Platzbedarf minimiert werden. Ausführungsbeispiele der Erfindung ermöglichen neben einer einfachen Ausführung eine Einsparung bzgl. Größe, Gewicht und Kosten.Embodiments of the present invention provide a pump assembly chip constructed of a plurality of stacked structured layers forming a pump and a safety valve integrated with the pump outlet. In embodiments of the invention thus no separate fluidic connections between the pump and the valve are required. Thus, in embodiments of the invention both a dead volume and a space requirement can be minimized. embodiments In addition to a simple design, the invention enables a saving in terms of size, weight and costs.
Gemäß Ausführungsbeispielen der erfindungsgemäßen Pumpenanordnung wirkt ein Überdruck am Pumpenanordnungseinlass schließend auf das Sicherheitsventil, so dass im unbetätigten Zustand ein Fluss in Richtung vom Einlass zum Auslass wirksam vermieden werden kann.According to embodiments of the pump arrangement according to the invention, an overpressure at the pump arrangement inlet acts closing on the safety valve, so that in the unactuated state, a flow in the direction from the inlet to the outlet can be effectively avoided.
Ausführungsbeispiele der Erfindung werden nachfolgend Bezug nehmend auf die beiliegenden Zeichnungen näher erläutert. Es zeigen:
- Fig. 1a
- eine schematische Querschnittansicht eines Ausführungsbeispiels einer erfindungsgemäßen Pumpenanordnung;
- Fig. 1b
- eine Unteransicht eines Pumpen-Teils des in
Fig. 1a gezeigten Ausführungsbeispiels; - Fig. 2
- eine schematische Querschnittansicht einer Modifikation des in
Fig. 1 gezeigten Ausführungsbeispiels; - Fig. 3
- eine schematische Querschnittansicht eines alternativen Ausführungsbeispiels einer erfindungsgemäßen Pumpenanordnung; und
- Fig. 4
- eine schematische Querschnittansicht eines weiteren alternativen Ausführungsbeispiels einer erfindungsgemäßen Pumpenanordnung.
- Fig. 1a
- a schematic cross-sectional view of an embodiment of a pump assembly according to the invention;
- Fig. 1b
- a bottom view of a pump part of the in
Fig. 1a shown embodiment; - Fig. 2
- a schematic cross-sectional view of a modification of the in
Fig. 1 shown embodiment; - Fig. 3
- a schematic cross-sectional view of an alternative embodiment of a pump assembly according to the invention; and
- Fig. 4
- a schematic cross-sectional view of another alternative embodiment of a pump assembly according to the invention.
Bezugnehmend auf die
Gemäß dem in den
Die in
Die Membranpumpe 20 umfasst ferner eine Pumpmembran 34, die in dem fünften Teil 18 strukturiert ist. Auf der Pumpmembran 34 ist eine Piezokeramik 36 angebracht, so dass durch Betätigen derselben ein Volumen einer Pumpkammer 38 der Membranpumpe 20 variiert werden kann. Zu diesem Zweck sind geeignete Mittel (nicht gezeigt) zum Anlegen einer Spannung an die Piezokeramik 36 vorgesehen, durch die die Pumpmembran 34 aus der Stellung, die in
Das in
Die in
Der Pumpenanordnungseinlass 46 und der Pumpenanordnungsauslass 48 können mit geeigneten Fluidverbindern versehen sein, die einen Anschluss weiterer fluidischer Strukturen ermöglichen, beispielsweise sog. Luer-Verbindern zum Anschluss von Schläuchen und dergleichen.The
Um die zweite Schicht 12 im Bereich des Sicherheitsventils zu stützen, kann eine optionale Abstandhalterstruktur 64 für dieselbe vorgesehen sein, die durch regelmäßig verteilte Stützen in
Im Betrieb der Pumpenanordnung, wie sie in den
In einem nachfolgenden Saughub, bei dem die Pumpmembran 34 in die in
Um einen Volumenstrom von dem Pumpenanordnungseinlass zu dem Pumpenanordnungsauslass zu bewirken, kann die Piezokeramik 36 periodisch mit einer Spannung beaufschlagt werden, beispielsweise durch einen gepulste Rechteckspannung. Abhängig von der Frequenz der angelegten Betätigungsspannung sowie einem Hubvolumen der Pumpmembran 34 kann somit eine gewünschte Förderrate erreicht werden.To effect a volume flow from the pump assembly inlet to the pump assembly outlet, the piezoceramic 36 may be periodically energized, for example by a pulsed square wave voltage. Depending on the frequency of the applied actuating voltage and a stroke volume of the pumping
Ist die Pumpe 22 nicht in Betrieb, so wird ein Fluss durch die Pumpenanordnung von dem Pumpeneinlass 46 zu dem Pumpenauslass 48 verhindert, da ein Überdruck an dem Pumpenkammereinlass 46 über den Fluidbereich 50 auf die Unterseite der Sicherheitsventilklappe 44 wirkt und gleichzeitig über die Pumpe 20 auf die Oberseite der Sicherheitsventilklappe 44 wirkt, da dieser Überdruck auf beide Rückschlagventile am Pumpeneinlass 22 und am Pumpenauslass 24 öffnend wirkt. Die durch den Überdruck am Einlass von unten auf die Sicherheitsventilklappe 44 wirkende Kraft ist größer als die von oben auf dieselbe wirkende Kraft, so dass ein Überdruck am Einlass schließend auf die Sicherheitsventilklappe 44 wirkt. Die von unten wirkende Kraft ist größer, da der Druck von unten auf eine größere Fläche wirkt als der Druck von oben. Genauer gesagt wirkt der Druck von unten auf die gesamte bewegliche Klappenfläche, während der Druck von oben auf den Bereich, der von dem Ventilsitz 42 bedeckt ist, nicht wirkt. Dadurch kann ein freier Fluss bei einem Überdruck am Pumpenanordnungseinlass im nicht-betätigtem Zustand sicher verhindert werden.When the
Eine Modifikation des in den
Bezugnehmend auf
Die Oberseite der dritten Schicht 114 ist ferner strukturiert, um zusammen mit der Unterseite einer Pumpmembran 128, die durch die vierte Schicht 116 gebildet ist, eine Pumpkammer 130 festzulegen. Die Pumpmembran 128 kann beispielsweise durch eine Metallschicht, wie z.B. eine Edelstahlfolie, gebildet sein. Auf der Pumpmembran 128 ist eine Piezokeramik 132 angeordnet. An die Piezokeramik 132 ist über entsprechende Verbindungseinrichtungen, die schematisch bei 134 gezeigt sind, eine Spannung anlegbar, um die Pumpmembran 128 zu betätigen. Bei Betätigung wird die Pumpmembran 128 nach unten ausgelenkt, so dass das Volumen der Pumpkammer 130 reduziert wird. Wie in
Die in
Die Pumpenanordnung umfasst einen Pumpenanordnungseinlass 146 und einen Pumpenanordnungsauslass 148. Der Pumpenanordnungseinlass 146 ist in der ersten Schicht 110 strukturiert und mit einem Fluidbereich 150, der ebenfalls in der ersten Schicht 110 strukturiert ist, fluidisch verbunden. Der Fluidbereich 150 grenzt an die Unterseite der Sicherheitsventilklappe 144 an, so dass ein am Einlass 146 herrschender Überdruck auf die Unterseite der Ventilklappe 144 wirkt.The pump assembly includes a
Der Pumpenanordnungsauslass 148 ist über einen Fluidkanal 156 mit einem Auslass 158 des Sicherheitsventils 140 fluidisch verbunden.The
Wie bei den oben beschriebenen Ausführungsbeispielen ist die bewegliche Sicherheitsventilklappe 44 nicht an dem Ventilsitz 142 befestigt, so dass ein verglichen mit einem auf die Unterseite der Ventilklappe herrschenden Druck auf die Oberseite der Ventilklappe herrschender Überdruck öffnend auf das Sicherheitsventil wirkt.As in the embodiments described above, the movable
Das Rückschlagventilmodul 100 stellt ein Rückschlagventil am Pumpeneinlass 122 und ein Rückschlagventil 124 am Pumpenauslass bereit. Ein Überdruck in der Pumpkammer 130 wirkt auf das Rückschlagventil am Pumpeneinlass 122 schließend und auf das Rückschlagventil am Pumpenauslass 124 öffnend, während ein Unterdruck in der Pumpkammer 130 auf das Rückschlagventil am Pumpeneinlass 122 öffnend und auf das Rückschlagventil am Pumpenauslass 124 schließend wirkt.The check valve module 100 provides a check valve at the
Der Pumpenanordnungseinlass 146 und der Pumpenanordnungsauslass 148 können wiederum ausgestaltet sein, um den Anschluss von Fluidschläuchen oder dergleichen zu ermöglichen. Wie in
Bei dem in
Der Betrieb der in
Bezugnehmend auf
Die in
Die in
Die piezoelektrischen Betätigungsglieder 226, 228 und 230 sind über entsprechende elektrische Verbindungen (nicht gezeigt) mit Spannungsquellen bzw. einer Steuereinrichtung (jeweils nicht gezeigt) verbunden. Dadurch können die einzelnen Membranabschnitte der Membran 216 in einer spezifischen Reihenfolge betätigt bzw. nach unten abgelenkt werden, um eine Pumpwirkung vom Pumpeneinlass 222 zum Pumpenauslass 224 zu bewirken, wie dies beispielsweise in der
Die in
Die Pumpenanordnung umfasst einen Pumpenanordnungseinlass 260 und einen Pumpenanordnungsauslass 262. Der Pumpenanordnungseinlass 260 ist fluidisch mit einem Fluidbereich 270 verbunden, der über eine Öffnung 272 in der zweiten Schicht 212 mit dem Pumpeneinlass 222 verbunden ist. Der Fluidanordnungsauslass 262 ist über einen Fluidkanal 274 mit einem Auslass 276 des Sicherheitsventils 250 fluidisch verbunden.The pump assembly includes a
Die fünfte Schicht 218 ist strukturiert, um einen Deckel zum Schutz der Membran 216 und der darauf angeordneten piezoelektrischen Betätigungsglieder 226, 228 und 230 sowie der elektrischen Anschlüsse für dieselben zu liefern.The
Im Betrieb können die Abschnitte der Membran 216 betrieben werden, wie es in der
Wird die Pumpe 220 nicht betrieben, so wirkt ein am Pumpenanordnungseinlass 260 herrschender Überdruck wiederum schließend auf das Sicherheitsventil 250.If the
Die vorliegende Erfindung schafft somit Pumpenanordnungen, bei denen ein Fluidfluss vom Einlass zum Auslass bei einem Überdruck am Einlass sicher vermieden werden kann, mit einem einfachen Aufbau, unter Verwendung einer geringen Anzahl von Bauteilen und mit einem geringen Torvolumen.The present invention thus provides pump assemblies in which fluid flow from the inlet to the outlet can be safely avoided with positive pressure at the inlet, with a simple structure, using a small number of components and with a small gate volume.
Die unterschiedlichen Teile bzw. Schichten von Ausführungsbeispielen der erfindungsgemäßen Pumpenanordnungen können aus beliebigen geeigneten Materialien unter Verwendung beliebiger geeigneter Herstellungsverfahren implementiert werden. Beispielsweise können die Teile aus Silizium bestehen, wobei entsprechende Strukturierungen durch Nassätzen (isotrop) oder Trockenätzen (anisotrop) erzeugt werden können. Alternativ können die Teile aus Kunststoff bestehen und durch Spritzgussverfahren hergestellt werden. Beispielsweise können die Schichten 12, 14 16 und 18 aus Silizium strukturiert sein. Die zweiten Schichten 12, 112 und 212 können beispielsweise aus einem elastischen Material, wie z. B. entsprechend dünnem Silizium oder Gummi bestehen. Die ersten Schichten 10, 110 und 210, die dritten Schichten 114 und 214 und die fünften Schichten 118 und 218 können beispielsweise durch Spritzguss aus Kunststoff gebildet sein. Die Membran 216 kann beispielsweise aus Silizium oder einem anderen geeigneten Material bestehen, um zusammen mit den Betätigungsgliedern 226, 228 und 230 jeweils piezoelektrische Biegewandler zu realisieren.The different parts or layers of embodiments of the pump assemblies of the present invention may be implemented from any suitable materials using any suitable manufacturing method. For example, the parts can be made of silicon, with appropriate structuring by wet etching (isotropic) or dry etching (anisotropic) can be generated. Alternatively, the parts may be made of plastic and produced by injection molding. For example, the
Erfindungsgemäße Pumpenanordnungen eignen sich für eine Vielzahl von Anwendungen. Im Folgenden werden lediglich beispielhaft Anwendungen genannt, bei denen es wichtig ist, einen freien Fluss bei einem Überdruck am Pumpeneinlass zu vermeiden. Solche Anwendungen, für die sich Ausführungsbeispiele erfindungsgemäßer Pumpenanordnungen eignen, umfassen z.B. Methanolzuführungspumpen in Brennstoffzellensystemen, Infusionspumpen, implantierbare Medikamentenverabreichungssysteme, tragbare Medikamentenverabreichungssysteme, Systeme zur Atemluftbefeuchtung sowie Systeme zur Dosierung von Narkosemitteln.Inventive pump assemblies are suitable for a variety of applications. In the following, only examples are given of applications in which it is important to avoid a free flow at an overpressure at the pump inlet. Such applications, for which embodiments of pump assemblies according to the invention are suitable, include e.g. Methanol feed pumps in fuel cell systems, infusion pumps, implantable drug delivery systems, portable drug delivery systems, respiratory humidification systems, and anesthetic dosage systems.
Eine peristaltische Mikropumpe mit normal offenen Ventilen, wie sie in
Anstelle nur einer Ausnehmung und nur eines Rückschlagventilmoduls könnten zwei separate Ausnehmungen in der oberen Oberfläche der dritten Schicht 114 vorgesehen sein, wobei in einer ersten Ausnehmung ein Rückschlagventilmodul für ein Rückschlagventil am Pumpeneinlass angebracht ist und in einer zweiten Ausnehmung ein zweites Rückschlagventilmodul mit einem Rückschlagventil für den Pumpenauslass angebracht ist.Instead of only one recess and only one check valve module, two separate recesses could be provided in the upper surface of the
Die Bestandteile von Ausführungsbeispielen der erfindungsgemäßen Pumpenanordnung, wie z.B. die zweite Schicht 12 und die dritte Schicht 14, können unter Verwendung beliebiger bekannter Fügetechniken miteinander verbunden sein, wie z.B. durch Kleben, Klemmen oder fügeschichtlose Verbindungsverfahren. The components of embodiments of the pump assembly according to the invention, such as e.g. the
Claims (15)
- Pump arrangement comprising:a pump (20; 120; 220) comprising a pump inlet (22; 122; 222) and a pump outlet (24; 124; 224) which is configured to pump a fluid from the pump inlet to the pump outlet;a safety valve (40; 140; 250) arranged between the pump outlet (24; 124; 224) and an outlet (48; 148; 262) of the pump arrangement and comprising a valve seat (42; 142; 252) and a valve lid (44; 144; 254);wherein the valve lid is formed in a second integrated part (12; 112; 212) of the pump arrangement,wherein an inlet (46; 146; 260) of the pump arrangement and a fluid region (50; 150; 270) fluidically connected thereto are formed in a third part (10; 110; 210) of the pump arrangement, andwherein the second integrated part (12; 112; 212) is arranged between a first integrated part (14, 114; 214) and the third part (10; 110; 210) of the pump arrangement, wherein a pressure in the fluid region (50; 150; 270) has a closing effect on the safety valve (40; 140; 250), and wherein the pump inlet (22; 122; 222) and the inlet of the pump arrangement (46; 146; 260) are connected fluidically,characterized in that the valve seat, the pump outlet and the pump inlet are patterned in a first surface of the first integrated part (14; 114; 214) of the pump arrangement.
- Arrangement in accordance with claim 1, wherein the pump inlet (22; 122; 222) and the inlet of the pump arrangement (46; 146; 260) are connected fluidically via an opening (52; 152; 272) in the second integrated part (12; 112; 212).
- Pump arrangement in accordance with claims 1 or 2, wherein the pump (20; 120) is a diaphragm pump comprising passive check valves.
- Pump arrangement in accordance with claim 3, wherein a valve seat (26) of a passive check valve at the pump inlet (22) and a valve flap (32) of a passive check valve at the pump outlet (24) are patterned in a second surface of the first integrated part (14) opposite the first surface of the first integrated part (14).
- Pump arrangement in accordance with claim 4, further comprising a fourth part (16) of the pump arrangement, the first integrated part (14) being arranged between the fourth part (16) and the second integrated part (12) of the pump arrangement, and a valve flap (28) of the check valve at the pump inlet (22) and a valve seat (30) of the check valve at the pump outlet (24) being patterned in a first surface of the fourth part (16) facing the first integrated part (14).
- Pump arrangement in accordance with claim 5, further comprising a fifth part (18), the fourth part (16) being arranged between the first integrated part (14) and the fifth part (18), and a pump diaphragm (34) of the pump (20) being patterned in the fifth part (18).
- Pump arrangement in accordance with claim 3, wherein the first integrated part (114) comprises one or more recesses in a second surface thereof opposite the first surface, wherein one or more check valve modules (126) comprising a check valve for the pump inlet and a check valve for the pump outlet are attached to the one or more recesses.
- Pump arrangement in accordance with claims 3 or 7, wherein the diaphragm pump comprises a metal diaphragm (128) and check valves made of silicon.
- Pump arrangement in accordance with claims 1 or 2, wherein the pump (220) is a peristaltic micropump.
- Pump arrangement in accordance with one of claims 1 to 9, wherein at least portions of a pump chamber (38; 130; 236) are patterned in a second surface of the first integrated part (14; 114; 214) opposite the first surface thereof, and wherein a pump diaphragm (34; 128; 216) is provided so as to abut on the pump chamber.
- Pump arrangement in accordance with claim 10, wherein a contour of wall sections of the pump chamber (130) which are opposite the pump diaphragm (128) is adapted to a contour of the pump diaphragm (128) in a deflected state.
- Pump arrangement in accordance with claim 10, wherein the pump diaphragm (34) comprises elevations (34a, 34b) projecting in the pump chamber.
- Pump arrangement in accordance with one of claims 1 to 12, wherein the second integrated part (12; 112; 212) comprises a layer of uniform thickness arranged between the first integrated part (14; 114; 214) and the third part (10; 110; 210) in which one or more openings (52; 54; 152; 272) are formed, wherein the second integrated part (12; 112; 212) separates the first integrated part (14; 114; 214) and the third integrated part (10; 110; 210) completely.
- Pump arrangement in accordance with one of claims 1 to 13, wherein a pump arrangement outlet (48) is formed in the third part (10) or in the first integrated part (114; 214).
- Pump arrangement in accordance with one of claims 1 to 14, wherein the safety valve comprises spacers which reduce bending of the valve lid (44) with a positive pressure in the fluid region (50).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/EP2007/010198 WO2009065427A1 (en) | 2007-11-23 | 2007-11-23 | Pump arrangement having safety valve |
Publications (2)
Publication Number | Publication Date |
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EP2220371A1 EP2220371A1 (en) | 2010-08-25 |
EP2220371B1 true EP2220371B1 (en) | 2012-06-06 |
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ID=39027183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07846798A Active EP2220371B1 (en) | 2007-11-23 | 2007-11-23 | Pump arrangement having safety valve |
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US (1) | US8382452B2 (en) |
EP (1) | EP2220371B1 (en) |
JP (1) | JP5027930B2 (en) |
WO (1) | WO2009065427A1 (en) |
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AU2003218730A1 (en) | 2003-03-11 | 2004-09-30 | Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E. V. | Microvalve that is doubly closed in a normal manner |
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2007
- 2007-11-23 JP JP2010534371A patent/JP5027930B2/en active Active
- 2007-11-23 WO PCT/EP2007/010198 patent/WO2009065427A1/en active Application Filing
- 2007-11-23 US US12/743,831 patent/US8382452B2/en active Active
- 2007-11-23 EP EP07846798A patent/EP2220371B1/en active Active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102015224622A1 (en) | 2015-12-08 | 2017-06-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | FREISTRAHLDOSIERSYSTEM |
DE102015224619A1 (en) | 2015-12-08 | 2017-06-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | micro-dosing system |
US10550833B2 (en) | 2015-12-08 | 2020-02-04 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Microdosing system |
US11022470B2 (en) | 2015-12-08 | 2021-06-01 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Free-jet dosing system |
Also Published As
Publication number | Publication date |
---|---|
JP5027930B2 (en) | 2012-09-19 |
WO2009065427A1 (en) | 2009-05-28 |
US8382452B2 (en) | 2013-02-26 |
JP2011504560A (en) | 2011-02-10 |
US20100290935A1 (en) | 2010-11-18 |
EP2220371A1 (en) | 2010-08-25 |
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