US20150292497A1 - Piezo pump and pressurized circuit provided therewith - Google Patents
Piezo pump and pressurized circuit provided therewith Download PDFInfo
- Publication number
- US20150292497A1 US20150292497A1 US14/682,777 US201514682777A US2015292497A1 US 20150292497 A1 US20150292497 A1 US 20150292497A1 US 201514682777 A US201514682777 A US 201514682777A US 2015292497 A1 US2015292497 A1 US 2015292497A1
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- United States
- Prior art keywords
- pump
- piezo
- chamber
- piezo pump
- pressure
- 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.)
- Abandoned
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- 239000012530 fluid Substances 0.000 description 8
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 1
- 238000005086 pumping 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
- F04B43/046—Micropumps with piezoelectric drive
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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
-
- 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
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
- F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
-
- 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
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
-
- 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
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/047—Pumps having electric drive
Definitions
- aspects of the invention relate to the field of piezo pumps for use in a pressurized circuit, comprising a pump chamber with an inlet provided with a one way inlet valve, for connection to a feeding line of the pressurized circuit and an outlet provided with a one way outlet valve, for connection to a discharge line of the pressurized circuit and a piezo pump diaphragm closing one end of the pump chamber.
- the piezo pump diaphragm is the driving element which, when connected to an alternate current, vibrates for alternatingly sucking fluid through the one way inlet valve into the pump chamber and forcing the fluid through the one way outlet valve out of the pump chamber.
- a piezo pump includes a pressure chamber defined at the side of the piezo pump diaphragm facing away from the pump chamber, wherein said pressure chamber is connected to a pressure source.
- the pressure in the pressure chamber at least partially compensates the pressure in the pump chamber, as a result of which the pressure difference over the piezo pump diaphragm is reduced and, consequently, the forces acting on the piezo pump diaphragm are reduced. This will substantially reduce the risk of leakages.
- the pressure source is defined by the feeding line which is connected to the pressure chamber via a pressure line.
- the pressure source may be defined by a pressurized vessel (or an equivalent pressure source).
- the invention also relates to a piezo pump assembly comprising at least two piezo pumps connected to each other in series, wherein the outlet of a previous piezo pump is connected to the inlet of a following piezo pump. This allows to achieve an increased pressure difference.
- the pressure source of at least the first piezo pump is defined by the feeding line and wherein the pressure source of at least the last piezo pump is defined by the discharge line which is connected to the pressure chamber of said last piezo pump via an additional pressure line.
- the feeding line acts as a pressure source for the pressure chamber to which it is connected.
- the discharge line acts as a pressure source for the pressure chamber to which it is connected.
- the pressure chamber of the first piezo pump will be connected to the feeding line and the pressure chamber of the second piezo pump will be connected to the discharge line.
- the piezo pump in a special embodiment of the piezo pump according to the present invention it comprises an additional pump chamber at the side of the piezo pump diaphragm opposite the pump chamber, which additional pump chamber likewise is provided with an inlet provided with a one way inlet valve, for connection to the feeding line of the pressurized circuit and an outlet provided with a one way outlet valve, for connection to the discharge line of the pressurized circuit, wherein the piezo pump diaphragm is common for both the pump chamber and the additional pump chamber and wherein the additional pump chamber acts as the pressure chamber.
- the additional pump chamber not only acts as the pressure chamber, but also helps in pumping the fluid, thus increasing the delivery of the piezo pump.
- a separate pressure source is not required in such an embodiment, because the feeding line of the additional pump chamber acts as such. It is noted that in such an embodiment the indications pump chamber and additional pump chamber are just a matter of definition and could be switched.
- a piezo pump assembly which comprises at least two of such piezo pumps connected to each other in series, wherein the outlets of a previous piezo pump are connected to the inlets of a following piezo pump.
- the number of piezo pumps connected in series may vary as desired.
- the invention also relates to a piezo pump device comprising a number of piezo pumps or piezo pump assemblies according to the present invention connected to each other in parallel. Thus the total delivery may be increased.
- each piezo pump or piezo pump assembly has a planar configuration and wherein these piezo pumps or piezo pump assemblies are stacked in a planar fashion to define a pillar like structure.
- the invention also relates to a pressurized circuit comprising a piezo pump, piezo pump assembly or piezo pump device according to the invention.
- FIG. 1 schematically shows a pressurized circuit comprising a first embodiment of the piezo pump
- FIG. 2 shows an embodiment of a piezo pump assembly comprising two piezo pumps in series
- FIG. 3 shows an embodiment of a piezo pump assembly comprising three piezo pumps in series
- FIG. 4 shows another embodiment of a piezo pump having two pump chambers
- FIG. 5 shows an embodiment of a piezo pump assembly comprising two piezo pumps according to FIG. 4 in series;
- FIG. 6 shows an embodiment with two piezo pump assemblies in parallel
- FIG. 7 schematically illustrates an embodiment of a pillar shaped piezo pump device.
- FIG. 1 a pressurized circuit for a fluid is illustrated schematically.
- a circuit may, for example, be used as a cooling circuit for electronics 1 in a satellite.
- the circuit as illustrated further comprises a heat exchanger 2 and possibly an accumulator vessel 3 .
- a piezo pump 4 which comprises a pump chamber 5 in a pump housing 4 A with an inlet 6 provided with a one way inlet valve 7 , for connection to a feeding line 8 of the pressurized circuit and an outlet 9 provided with a one way outlet valve 10 , for connection to a discharge line 11 of the pressurized circuit.
- the piezo pump 4 further is provided with a piezo pump diaphragm 12 that closes one end of the pump chamber 5 and that by control lines 13 is connected to a control unit 14 .
- a piezo pump diaphragm 12 that closes one end of the pump chamber 5 and that by control lines 13 is connected to a control unit 14 .
- the piezo pump diaphragm 12 will vibrate between two positions (for example 12 and 12 ′) for alternatingly sucking fluid into the pump chamber 5 through the inlet 6 and forcing fluid out of the pump chamber 5 through the outlet 9 .
- a pressure chamber 15 in the pump housing 4 A is defined at the side of the piezo pump diaphragm 12 facing away from the pump chamber 5 and this pressure chamber 15 is connected to the feeding line 8 via a pressure line 16 .
- the pressure chamber 15 may be connected directly to a pressurized vessel 17 or another pressure source.
- the pressure in the pressure chamber 15 (or pressure vessel 17 ) at least partially compensates the pressure in the pump chamber 5 , as a result of which the pressure difference over the piezo pump diaphragm 12 is reduced and, consequently, the forces acting on the piezo pump diaphragm 12 are reduced. This will substantially reduce the risk of leakages past said diaphragm.
- FIG. 2 illustrates a piezo pump assembly comprising two piezo pumps 4 ′ and 4 ′′ connected to each other in series, wherein the outlet 9 ′ of the first piezo pump 4 ′ is connected to the inlet 6 ′′ of the second piezo pump 4 ′′.
- the pressure chamber 15 ′ of the first piezo pump 4 ′ is connected to the feeding line 8 by a pressure line 16 ′, but the pressure chamber 15 ′′ of the second piezo pump 4 ′′ is connected to the discharge line 11 via an additional pressure line 18 .
- One large advantage offered by such an embodiment is, that the risk of an hydraulic short circuit over the series of piezo pumps 4 ′ and 4 ′′ is substantially reduced compared to a situation in which also the pressure chamber 15 ′′ of the second piezo pump 4 ′′ would be connected to the feeding line 8 . In the latter case a failure of only two members (the one way outlet valve 10 ′′ and the piezo pump diaphragm 12 ′′ of the second piezo pump 4 ′′) would be sufficient to cause a short circuit in which the discharge line 11 is directly connected to the feeding line 8 .
- FIG. 3 shows an embodiment of a piezo pump assembly with three piezo pumps 4 ′, 4 ′′ and 4 ′′′, wherein only the pressure chamber 15 ′′′ of the last piezo pump 4 ′′′ is connected to the discharge line 11 .
- the pressure chambers of the remaining piezo pumps all are connected to the feeding line 8 .
- FIG. 3 in dotted lines illustrates an alternative possibility according to which the pressure chamber 15 ′′ of the second piezo pump 4 ′′ is connected to the outlet 9 ′ of the first piezo pump 4 ′ by a connecting line 19 (and is not connected to the feeding line 8 ). A similar situation may occur for the pressure chamber 15 ′′′.
- a special embodiment of the piezo pump which comprises an additional pump chamber 20 (taking the place of the pressure chamber, or stated another way is a pressure chamber that is configured to pump) at the side of the piezo pump diaphragm 12 opposite the pump chamber 5 .
- Said additional pump chamber 20 likewise is provided with an inlet 21 provided with a one way inlet valve 22 , for connection to the feeding line 8 of the pressurized circuit and an outlet 23 provided with a one way outlet valve 24 , for connection to the discharge line 11 of the pressurized circuit.
- the piezo pump diaphragm 12 is common for both the pump chamber 5 and the additional pump chamber 20 .
- the additional pump chamber 20 acts as the pressure chamber for the pump chamber 5
- the pump chamber 5 acts as a pressure chamber for the additional pump chamber 20 .
- two piezo pumps according to FIG. 4 are connected to each other in series (wherein the outlets of a first piezo pump are connected to the inlets of a second piezo pump).
- the outlets of a first piezo pump are connected to the inlets of a second piezo pump.
- FIG. 6 a schematic representation is illustrated of a piezo pump device comprising two piezo pump assemblies (one comprising two piezo pumps 25 and 26 connected in series and the other comprising two piezo pumps 27 and 28 connected in series) connected to each other in parallel.
- two piezo pump assemblies may be connected in parallel and each such piezo pump assembly may comprise any number of piezo pumps (also only one), wherein those numbers do not have to be the same for all piezo pump assemblies.
- each piezo pump or piezo pump assembly as described above has a planar configuration and wherein a number of such piezo pumps or piezo pump assemblies 29 are stacked in a planar fashion to define a pillar like structure 30 as shown in FIG. 7 .
Abstract
A piezo pump for use in a pressurized circuit includes a pump chamber with an inlet provided with a one way inlet valve, for connection to a feeding line of the pressurized circuit and an outlet provided with a one way outlet valve, for connection to a discharge line of the pressurized circuit and a piezo pump diaphragm closing one end of the pump chamber. A pressure chamber, which can function as a second pump chamber if desired, is defined at the side of the piezo pump diaphragm facing away from the pump chamber, wherein said pressure chamber is connected to a pressure source, which may be the feeding line.
Description
- The discussion below is merely provided for general background information and is not intended to be used as an aid in determining the scope of the claimed subject matter.
- Aspects of the invention relate to the field of piezo pumps for use in a pressurized circuit, comprising a pump chamber with an inlet provided with a one way inlet valve, for connection to a feeding line of the pressurized circuit and an outlet provided with a one way outlet valve, for connection to a discharge line of the pressurized circuit and a piezo pump diaphragm closing one end of the pump chamber.
- In such a piezo pump the piezo pump diaphragm is the driving element which, when connected to an alternate current, vibrates for alternatingly sucking fluid through the one way inlet valve into the pump chamber and forcing the fluid through the one way outlet valve out of the pump chamber. Although such a piezo pump with a very simple design effectively achieves a pump action, the use of such a piezo pump in a pressurized circuit may lead to problems with respect to the seal between the piezo pump diaphragm and a surrounding wall of the pump chamber. Whereas achieving an appropriate seal already is difficult because of the vibrations of the piezo pump diaphragm, the fact that the fluid in the pump chamber is pressurized increases the risk of leakages between the surrounding wall of the pump chamber and the piezo pump diaphragm.
- This Summary and the Abstract herein are provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary and the Abstract are not intended to identify key features or essential features of the claimed subject matter, nor are they intended to be used as an aid in determining the scope of the claimed subject matter. The claimed subject matter is not limited to implementations that solve any or all disadvantages noted in the Background.
- A piezo pump includes a pressure chamber defined at the side of the piezo pump diaphragm facing away from the pump chamber, wherein said pressure chamber is connected to a pressure source.
- The pressure in the pressure chamber at least partially compensates the pressure in the pump chamber, as a result of which the pressure difference over the piezo pump diaphragm is reduced and, consequently, the forces acting on the piezo pump diaphragm are reduced. This will substantially reduce the risk of leakages.
- In one embodiment of the piezo pump the pressure source is defined by the feeding line which is connected to the pressure chamber via a pressure line. Such an embodiment offers the advantage that the pressure at both sides of the piezo pump diaphragm always will be substantially the same, thus minimising any pressure difference over said piezo pump diaphragm. Moreover such an embodiment only requires a connection between the feeding line and the pressure chamber, but not a separate pressure source, because the feeding line will act as such.
- However, in an alternative embodiment of the piezo pump the pressure source may be defined by a pressurized vessel (or an equivalent pressure source).
- The invention also relates to a piezo pump assembly comprising at least two piezo pumps connected to each other in series, wherein the outlet of a previous piezo pump is connected to the inlet of a following piezo pump. This allows to achieve an increased pressure difference.
- With respect to such a piezo pump assembly an embodiment is conceivable in which the pressure source of at least the first piezo pump is defined by the feeding line and wherein the pressure source of at least the last piezo pump is defined by the discharge line which is connected to the pressure chamber of said last piezo pump via an additional pressure line.
- Thus, in such an embodiment not only the feeding line, but also the discharge line acts as a pressure source for the pressure chamber to which it is connected. One large advantage offered by such an embodiment is, that the risk of an hydraulic short circuit over the series of piezo pumps is substantially reduced compared to a situation in which also the pressure chamber of the last piezo pump is connected to the feeding line. In the latter case a failure of only two members (the one way outlet valve and the piezo pump diaphragm of the last piezo pump) is sufficient to cause a short circuit (a connection between the feeding line and discharge line), whereas in the former case a failure of four elements (both the one way inlet and outlet valves of the last piezo pump and the one way outlet valve with the one way inlet valve or with the piezo pump diaphragm of the first piezo pump) is required to cause a short circuit (for more than two piezo pumps connected in series an equivalent situation applies).
- If there are exactly two piezo pumps connected to each other in series in such an assembly, the pressure chamber of the first piezo pump will be connected to the feeding line and the pressure chamber of the second piezo pump will be connected to the discharge line.
- In embodiments of a piezo pump assembly with more than two piezo pumps connected to each other in series, only the pressure chamber of the last piezo pump may be connected to the discharge line. The pressure chamber of the remaining piezo pumps then all will be connected to the feeding line. Thus the number of pressure chambers connected to the discharge line is kept minimal (one only), which may be advantageous in view of pressure fluctuations which inevitably are present in the discharge line as a result of the operation of the piezo pumps and which could influence the effectiveness of the pressure equalisation over the piezo pump diaphragm (it may be desirable to have a more constant pressure in the pressure chambers and this will be provided by the feeding line in which no or lesser pressure fluctuations occur).
- In a special embodiment of the piezo pump according to the present invention it comprises an additional pump chamber at the side of the piezo pump diaphragm opposite the pump chamber, which additional pump chamber likewise is provided with an inlet provided with a one way inlet valve, for connection to the feeding line of the pressurized circuit and an outlet provided with a one way outlet valve, for connection to the discharge line of the pressurized circuit, wherein the piezo pump diaphragm is common for both the pump chamber and the additional pump chamber and wherein the additional pump chamber acts as the pressure chamber.
- In such a piezo pump the additional pump chamber not only acts as the pressure chamber, but also helps in pumping the fluid, thus increasing the delivery of the piezo pump. A separate pressure source is not required in such an embodiment, because the feeding line of the additional pump chamber acts as such. It is noted that in such an embodiment the indications pump chamber and additional pump chamber are just a matter of definition and could be switched.
- Also in such an embodiment of the piezo pump a piezo pump assembly is conceivable which comprises at least two of such piezo pumps connected to each other in series, wherein the outlets of a previous piezo pump are connected to the inlets of a following piezo pump. The number of piezo pumps connected in series may vary as desired.
- The invention also relates to a piezo pump device comprising a number of piezo pumps or piezo pump assemblies according to the present invention connected to each other in parallel. Thus the total delivery may be increased.
- For example it is conceivable that in such a piezo pump device each piezo pump or piezo pump assembly has a planar configuration and wherein these piezo pumps or piezo pump assemblies are stacked in a planar fashion to define a pillar like structure.
- Finally the invention also relates to a pressurized circuit comprising a piezo pump, piezo pump assembly or piezo pump device according to the invention.
- Hereinafter aspects of the invention will be elucidated while referring to the drawings, in which:
-
FIG. 1 schematically shows a pressurized circuit comprising a first embodiment of the piezo pump; -
FIG. 2 shows an embodiment of a piezo pump assembly comprising two piezo pumps in series; -
FIG. 3 shows an embodiment of a piezo pump assembly comprising three piezo pumps in series; -
FIG. 4 shows another embodiment of a piezo pump having two pump chambers; -
FIG. 5 shows an embodiment of a piezo pump assembly comprising two piezo pumps according toFIG. 4 in series; -
FIG. 6 shows an embodiment with two piezo pump assemblies in parallel, and -
FIG. 7 schematically illustrates an embodiment of a pillar shaped piezo pump device. - Referring firstly to
FIG. 1 a pressurized circuit for a fluid is illustrated schematically. Such a circuit may, for example, be used as a cooling circuit forelectronics 1 in a satellite. The circuit as illustrated further comprises aheat exchanger 2 and possibly an accumulator vessel 3. - For causing a flow of the fluid through the circuit in accordance with the arrows indicated in
FIG. 1 , apiezo pump 4 is provided which comprises apump chamber 5 in apump housing 4A with aninlet 6 provided with a oneway inlet valve 7, for connection to afeeding line 8 of the pressurized circuit and anoutlet 9 provided with a oneway outlet valve 10, for connection to adischarge line 11 of the pressurized circuit. - The
piezo pump 4 further is provided with apiezo pump diaphragm 12 that closes one end of thepump chamber 5 and that bycontrol lines 13 is connected to acontrol unit 14. As a result of electric control signals (for example an alternate current) from thecontrol unit 14 thepiezo pump diaphragm 12 will vibrate between two positions (for example 12 and 12′) for alternatingly sucking fluid into thepump chamber 5 through theinlet 6 and forcing fluid out of thepump chamber 5 through theoutlet 9. - A
pressure chamber 15 in thepump housing 4A is defined at the side of thepiezo pump diaphragm 12 facing away from thepump chamber 5 and thispressure chamber 15 is connected to thefeeding line 8 via apressure line 16. As an alternative thepressure chamber 15 may be connected directly to a pressurizedvessel 17 or another pressure source. The pressure in the pressure chamber 15 (or pressure vessel 17) at least partially compensates the pressure in thepump chamber 5, as a result of which the pressure difference over thepiezo pump diaphragm 12 is reduced and, consequently, the forces acting on thepiezo pump diaphragm 12 are reduced. This will substantially reduce the risk of leakages past said diaphragm. -
FIG. 2 illustrates a piezo pump assembly comprising twopiezo pumps 4′ and 4″ connected to each other in series, wherein theoutlet 9′ of thefirst piezo pump 4′ is connected to theinlet 6″ of thesecond piezo pump 4″. Thepressure chamber 15′ of thefirst piezo pump 4′ is connected to thefeeding line 8 by apressure line 16′, but thepressure chamber 15″ of thesecond piezo pump 4″ is connected to thedischarge line 11 via anadditional pressure line 18. - One large advantage offered by such an embodiment is, that the risk of an hydraulic short circuit over the series of
piezo pumps 4′ and 4″ is substantially reduced compared to a situation in which also thepressure chamber 15″ of thesecond piezo pump 4″ would be connected to thefeeding line 8. In the latter case a failure of only two members (the oneway outlet valve 10″ and thepiezo pump diaphragm 12″ of thesecond piezo pump 4″) would be sufficient to cause a short circuit in which thedischarge line 11 is directly connected to thefeeding line 8. In the illustrated embodiment, however, a failure of four elements (both the oneway inlet valve 7″ and oneway outlet valve 10″ of thesecond piezo pump 4″ and the oneway outlet valve 10″ with the oneway inlet valve 7′ or with thepiezo pump diaphragm 12′ of thefirst piezo pump 4′) is required to cause such a short circuit. -
FIG. 3 shows an embodiment of a piezo pump assembly with threepiezo pumps 4′, 4″ and 4′″, wherein only thepressure chamber 15′″ of thelast piezo pump 4′″ is connected to thedischarge line 11. The pressure chambers of the remaining piezo pumps all are connected to thefeeding line 8. -
FIG. 3 in dotted lines illustrates an alternative possibility according to which thepressure chamber 15″ of thesecond piezo pump 4″ is connected to theoutlet 9′ of thefirst piezo pump 4′ by a connecting line 19 (and is not connected to the feeding line 8). A similar situation may occur for thepressure chamber 15′″. - Referring to
FIG. 4 a special embodiment of the piezo pump is illustrated which comprises an additional pump chamber 20 (taking the place of the pressure chamber, or stated another way is a pressure chamber that is configured to pump) at the side of thepiezo pump diaphragm 12 opposite thepump chamber 5. Saidadditional pump chamber 20 likewise is provided with aninlet 21 provided with a oneway inlet valve 22, for connection to thefeeding line 8 of the pressurized circuit and anoutlet 23 provided with a oneway outlet valve 24, for connection to thedischarge line 11 of the pressurized circuit. In this embodiment thepiezo pump diaphragm 12 is common for both thepump chamber 5 and theadditional pump chamber 20. Theadditional pump chamber 20 acts as the pressure chamber for thepump chamber 5, and thepump chamber 5 acts as a pressure chamber for theadditional pump chamber 20. - In an embodiment of an piezo pump assembly illustrated in
FIG. 5 , two piezo pumps according toFIG. 4 are connected to each other in series (wherein the outlets of a first piezo pump are connected to the inlets of a second piezo pump). Of course it is possible to connect more than two piezo pumps in series. - Referring to
FIG. 6 a schematic representation is illustrated of a piezo pump device comprising two piezo pump assemblies (one comprising twopiezo pumps piezo pumps 27 and 28 connected in series) connected to each other in parallel. Of course more than two such piezo pump assemblies may be connected in parallel and each such piezo pump assembly may comprise any number of piezo pumps (also only one), wherein those numbers do not have to be the same for all piezo pump assemblies. - It is possible that each piezo pump or piezo pump assembly as described above has a planar configuration and wherein a number of such piezo pumps or
piezo pump assemblies 29 are stacked in a planar fashion to define a pillar likestructure 30 as shown inFIG. 7 . - Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above as has been held by the courts. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (12)
1. A piezo pump assembly for use in a pressurized circuit, comprising:
a piezo pump having a pump chamber with a pump chamber inlet provided with a one way inlet valve connected to a feeding line of the pressurized circuit and a pump chamber outlet provided with a one way outlet valve connected to a discharge line of the pressurized circuit and a piezo pump diaphragm closing one end of the pump chamber, wherein a pressure chamber is defined on a side of the piezo pump diaphragm facing away from the pump chamber; and
a pressure source fluidly connected to the pump chamber.
2. The piezo pump assembly according to claim 1 , wherein the pressure source is defined by being fluidly connected to the feeding line with a pressure line.
3. The piezo pump assembly according to claim 1 , wherein the pressure source is a pressurized vessel.
4. The piezo pump assembly comprising at least two piezo pumps according to claim 1 connected to each other in series defining at least a first piezo pump and a last piezo pump, wherein the outlet of the piezo pump is connected to an inlet of a following piezo pump.
5. The piezo pump assembly according to claim 4 , wherein the pressure source of at least the first piezo pump is fluidly connected to the feeding line and wherein a pressure source of at least the last piezo pump is defined by being fluidly connected to the discharge line with an additional pressure line.
6. The piezo pump assembly according to claim 5 , wherein only the pressure chamber of the last piezo pump is fluidly connected to the discharge line.
7. The piezo pump assembly according to claim 1 , wherein a one way inlet valve is operably coupled to the pressure chamber to allow flow into the pressure chamber through an inlet and inhibit flow out of the pressure chamber through the inlet, and wherein a one way outlet valve is operably coupled to the pressure chamber to allow flow out of the pressure chamber through an outlet and inhibit flow into the pressure chamber through the outlet.
8. The piezo pump assembly comprising at least two piezo pumps according to claim 7 connected to each other in series, wherein the outlet of the pump chamber of the piezo pump is connected to an inlet of a pump chamber of a following piezo pump, and wherein the outlet of the pressure chamber of the piezo pump is connected to an inlet of a pressure chamber of a following piezo pump.
9. The piezo pump assembly comprising a number of piezo pumps according to claim 1 connected to each other in parallel.
10. The piezo pump assembly according to claim 9 , wherein each piezo pump has a planar configuration and wherein the number of piezo pumps are stacked in a planar fashion to define a pillar like structure.
11. A piezo pump assembly for use in a pressurized circuit, comprising:
a pump housing having a pump chamber with a pump chamber inlet provided with a one way inlet valve connected to a feeding line of the pressurized circuit and a pump chamber outlet provided with a one way outlet valve connected to a discharge line of the pressurized circuit and a piezo pump diaphragm closing one end of the pump chamber, wherein a pressure chamber is defined in the pump housing on a side of the piezo pump diaphragm facing away from the pump chamber.
12. A piezo pump assembly for use in a pressurized circuit, comprising:
a pump housing having a first pump chamber with a first pump chamber inlet provided with a first one way inlet valve connected to a feeding line of the pressurized circuit and a first pump chamber outlet provided with a first one way outlet valve connected to a discharge line of the pressurized circuit and a piezo pump diaphragm closing one end of the pump chamber, the pump housing having further a second pump chamber on a side of the piezo pump diaphragm opposite the first pump diaphragm, the second pump chamber having a second pump chamber inlet provided with a second one way inlet valve connected to the feeding line of the pressurized circuit and a second pump chamber outlet provided with a second one way outlet valve connected to the discharge line of the pressurized circuit.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP14164209.0A EP2930363B1 (en) | 2014-04-10 | 2014-04-10 | Piezoelectric pump assembly and pressurised circuit provided therewith |
EP14164209.0 | 2014-04-10 |
Publications (1)
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US20150292497A1 true US20150292497A1 (en) | 2015-10-15 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/682,777 Abandoned US20150292497A1 (en) | 2014-04-10 | 2015-04-09 | Piezo pump and pressurized circuit provided therewith |
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US (1) | US20150292497A1 (en) |
EP (1) | EP2930363B1 (en) |
DK (1) | DK2930363T3 (en) |
LT (1) | LT2930363T (en) |
Cited By (1)
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WO2022209704A1 (en) * | 2021-04-02 | 2022-10-06 | 株式会社村田製作所 | Fluid control device |
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TWI634264B (en) | 2017-01-13 | 2018-09-01 | 研能科技股份有限公司 | Air pump |
EP3480460B1 (en) * | 2017-11-02 | 2021-06-23 | AVS Added Value Industrial Engineering Solutions, S.L. | Volumetric pump |
TWI817615B (en) * | 2022-07-18 | 2023-10-01 | 研能科技股份有限公司 | Fluid pump module |
Citations (18)
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JP4793442B2 (en) * | 2006-03-29 | 2011-10-12 | 株式会社村田製作所 | Micro pump |
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2014
- 2014-04-10 DK DK14164209.0T patent/DK2930363T3/en active
- 2014-04-10 EP EP14164209.0A patent/EP2930363B1/en active Active
- 2014-04-10 LT LTEP14164209.0T patent/LT2930363T/en unknown
-
2015
- 2015-04-09 US US14/682,777 patent/US20150292497A1/en not_active Abandoned
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US20020025260A1 (en) * | 2000-07-10 | 2002-02-28 | Teruo Maruyama | Fluid discharge apparatus and fluid discharge method |
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JP2005016367A (en) * | 2003-06-25 | 2005-01-20 | Sharp Corp | Piezo-electric pump and stirling cooling vessel |
US20080101965A1 (en) * | 2004-11-17 | 2008-05-01 | Sharp Kabushiki Kaisha | Piezoelectric Pump and Stirling Refrigerator/Freezer |
US7481628B2 (en) * | 2005-03-01 | 2009-01-27 | Kabushiki Kaisha Toyota Jidoshokki | Diaphragm pump |
US20080038125A1 (en) * | 2006-08-09 | 2008-02-14 | Alps Electric Co., Ltd. | Piezoelectric pump and piezoelectric vibrator |
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US20120304993A1 (en) * | 2011-05-31 | 2012-12-06 | Kazufuku Nitta | Pump unit and breathing assistance device |
US20140286795A1 (en) * | 2011-12-09 | 2014-09-25 | Murata Manufacturing Co., Ltd. | Gas control apparatus |
US20130333564A1 (en) * | 2012-06-18 | 2013-12-19 | Invacare Corporation | System and method for concentrating gas |
GB2504668A (en) * | 2012-07-26 | 2014-02-12 | Atomjet Ltd | Micro Pump with valvular conduits |
US20160201665A1 (en) * | 2013-09-24 | 2016-07-14 | Murata Manufacturing Co., Ltd. | Gas control device |
US9205665B2 (en) * | 2013-12-19 | 2015-12-08 | Toshiba Tec Kabushiki Kaisha | Inkjet apparatus using piezoelectric pump |
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Also Published As
Publication number | Publication date |
---|---|
EP2930363A1 (en) | 2015-10-14 |
DK2930363T3 (en) | 2020-09-07 |
LT2930363T (en) | 2021-01-11 |
EP2930363B1 (en) | 2020-06-10 |
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