US20090148318A1 - Piezoelectric Pump - Google Patents

Piezoelectric Pump Download PDF

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Publication number
US20090148318A1
US20090148318A1 US12/367,084 US36708409A US2009148318A1 US 20090148318 A1 US20090148318 A1 US 20090148318A1 US 36708409 A US36708409 A US 36708409A US 2009148318 A1 US2009148318 A1 US 2009148318A1
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United States
Prior art keywords
opening
diaphragm
piezoelectric
piezoelectric element
fluid
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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US12/367,084
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English (en)
Inventor
Gaku Kamitani
Midori Sunaga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Assigned to MURATA MANUFACTURING CO., LTD. reassignment MURATA MANUFACTURING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAMITANI, GAKU, SUNAGA, MIDORI
Publication of US20090148318A1 publication Critical patent/US20090148318A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive
    • F04B43/043—Micropumps
    • F04B43/046—Micropumps with piezoelectric 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
    • 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
    • F04B43/028—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms with in- or outlet valve arranged in the plate-like flexible member
    • 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
    • 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
    • F04B45/045—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms with in- or outlet valve arranged in the plate-like pumping 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
    • 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
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/08—Cylinder or housing parameters
    • F04B2201/0806—Resonant frequency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/40—Transmission of power
    • F05B2260/407—Transmission of power through piezoelectric conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/60—Fluid transfer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/10—Inorganic materials, e.g. metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Definitions

  • the present invention relates to piezoelectric pumps, and more particularly, to a piezoelectric pump using a diaphragm that is bent by a piezoelectric element.
  • Piezoelectric pumps are used as cooling pumps in small electronic devices, such as notebook personal computers, and fuel transportation pumps in fuel cells.
  • a piezoelectric pump is a pump using a diaphragm that is bent by the application of voltage to a piezoelectric element, and has advantages of a simple structure, a low profile structure, and low power consumption.
  • check valves are respectively provided at an inlet and an outlet.
  • reliability of the check valves is reduced with use for a long period, and the fluid is not sufficiently transported because of adhesion of foreign substances, such as dust, to the check valves.
  • the check valves to which foreign substances, such as dust, adhere, do not follow the driving, and transportation of the fluid is impossible.
  • Patent Documents 1 and 2 propose a piezoelectric pump in which a diaphragm is mounted in contact with a pump body having an inlet and an outlet and in which a plurality of piezoelectric elements are mounted on the diaphragm so as to be arranged from the inlet to the outlet.
  • the piezoelectric elements are sequentially driven from a piezoelectric element close to the inlet to a piezoelectric element close to the outlet, so that the diaphragm can be sequentially bent from the inlet toward the outlet so as to push out the fluid from the inlet toward the outlet.
  • a channel between the inlet and the outlet is closed by restoration of the diaphragm. Therefore, it is possible to omit check valves from the inlet and the outlet.
  • the piezoelectric pump has a large size and a complicated structure.
  • a driving circuit for sequentially driving the piezoelectric elements is complicated, and this increases the cost.
  • Patent Document 3 discloses a fluid pump having no check valve.
  • a pump chamber is formed between a pump body and a diaphragm, a first opening is provided in a center portion of the pump body, a second opening is provided in a peripheral portion of the pump body, an elastic buffer is provided in the diaphragm, and the diaphragm is bent by causing the center portion of the diaphragm by another driving means to reciprocate.
  • the diaphragm opens the first opening, fluid is drawn into the pump chamber from the first opening.
  • the buffer portion corresponding to the second openings is bent, and the fluid is discharged from the second openings by the elastic restoring force of the buffer portion.
  • Patent Document 3 since the diaphragm is merely driven in a reciprocating manner by the single driving source, the structure is simple. However, since only the portion of the diaphragm opposing the first opening, that is, only the center portion of the diaphragm is displaced and the peripheral portion (buffer portion) of the diaphragm is bent after the displacement, the diaphragm needs to be formed of a soft material. This makes it impossible to increase the discharging pressure. For example, when the fluid is compressible fluid such as air, a very soft material, such as rubber or resin, needs to be used in order to elastically deform the buffer portion of the diaphragm, and the discharging pressure is decreased. As a result, the fluid sometimes cannot be reliably discharged under a condition that the pressure outside the pump chamber is high.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2-149778
  • Patent Document 2 Japanese Unexamined Patent Application Publication No. 4-86388
  • Patent Document 3 Japanese Unexamined Patent Application Publication (Translation of PCT application) No. 10-511165
  • an object of a preferred embodiment of the present invention is to provide a piezoelectric pump that has a simple structure and that can increase the discharging pressure.
  • the present invention provides a piezoelectric pump including a pump body; a diaphragm fixed at an outer peripheral portion to the pump body; a piezoelectric element bonded to a center portion of the diaphragm; a first opening provided in a portion of the pump body opposing the substantial center portion of the diaphragm; and a second opening provided in an intermediate region between the center portion and the outer peripheral portion of the diaphragm or in a portion of the pump body opposing the intermediate region.
  • the diaphragm is formed by a metal plate, and the piezoelectric element has a size such as to cover the first opening and such as not to reach the second opening.
  • a portion of the diaphragm opposing the first opening and a portion of the diaphragm opposing the second opening are bent in opposite directions by applying a voltage having a predetermined frequency to the piezoelectric element so that fluid is drawn in from one of the first opening and the second opening and is discharged from the other opening.
  • a metal plate having a high Young's modulus is used as the diaphragm and the fluid is discharged by forcibly bending the diaphragm by the piezoelectric element.
  • the piezoelectric element has a size such as to cover the first opening and such as not to reach the second opening, the portion of the diaphragm opposing the first opening and the portion of the diaphragm opposing the second opening can be efficiently bent in opposite directions. For this reason, the discharging pressure can be increased, and the fluid can be reliably discharged even under a condition where the pressure on the discharging side is high.
  • the diaphragm is formed by the metal plate having a high Young's modulus, it can properly follow the piezoelectric element, and this allows operation at a high frequency.
  • the piezoelectric element be driven at a frequency near the resonance frequency of a displacement member defined by the diaphragm and the piezoelectric element, since the displacement volume of the diaphragm is quite large, and a high flow rate can be obtained.
  • driving is performed in a primary resonance mode (first resonance frequency)
  • first resonance frequency fluid can be drawn in from the first opening, and can be discharged from the second opening.
  • tertiary resonance mode tertiary resonance frequency
  • a soft material is used as the diaphragm, as in Patent Document 3, there is a time lag between displacement of the center portion of the diaphragm and displacement of the peripheral portion of the diaphragm. Therefore, the fluid pump in Patent Document 3 cannot be driven at a frequency higher than or equal to a frequency corresponding to the time lag.
  • the piezoelectric pump of the present invention uses a metal plate having a high Young's modulus as the diaphragm, it can be driven at a high resonance frequency of the first resonance mode and the tertiary resonance mode.
  • the displacement is small, stress generated in a fixed portion between the pump body and the diaphragm is reduced, and reliability is thereby improved. It is preferable that the Young's modulus of the diaphragm be 100 GPa or more.
  • the piezoelectric pump of the present invention is suited to transport compressible fluid such as air.
  • a piezoelectric pump discharges imcompressible fluid such as liquid
  • check valves formed of a soft material, such as rubber or resin are respectively provided at the inlet and the outlet, and a piezoelectric element is driven at a low frequency of about several tens of hertz.
  • the displacement amount of the piezoelectric element is quite small, and little fluid can be discharged.
  • the maximum displacement can be obtained.
  • the resonance frequency is a high frequency of the order of kilohertz
  • the check valves cannot perform a follow-up operation. Since a check valve is not provided in the present invention, even when the piezoelectric element is driven at the frequency near the resonance frequency, imcompressible fluid can be efficiently transported without being restricted by the check valve. Further, there is no fear that operation failure will be caused by adhesion of dust or the like to the check valve, and a highly reliable piezoelectric pump can be provided.
  • the second opening be provided at a position where the diaphragm is maximally displaced in a tertiary resonance mode or outside the position. While the position where the diaphragm is maximally displaced in the tertiary resonance mode differs in accordance with the area ratio of the piezoelectric element and the diaphragm or the Young's modulus of the diaphragm, when the second opening (inlet) is provided at the position of maximum displacement or outside the position, a sufficient sealing ability of the second opening (inlet) can be obtained when discharging the fluid from the first opening (discharging port) in an operation cycle of the piezoelectric pump, and backflow of the fluid to be discharged can be prevented. This increases not only the discharging pressure, but also the discharging flow rate.
  • a plurality of the second openings may be provided on the same circumference centered on the first opening.
  • the second opening serves as an inlet. If one second opening is provided, fluid does sometimes not rapidly flow into an annular pocket space formed between the pump body and the peripheral portion of the diaphragm, and a sufficient amount of fluid is not discharged. In contrast, when a plurality of second openings are provided on the same circumference, the fluid can rapidly flow into the annular pocket space, and the amount of discharged fluid can be increased.
  • the piezoelectric element having a size such as to cover the first opening and such as not to reach the second opening is bonded to the center portion of the metal diaphragm, and the piezoelectric element is driven by a voltage having a predetermined frequency so that the portion of the diaphragm opposing the first opening and the portion of the diaphragm opposing the second opening are bent in opposite directions. Therefore, it is possible to increase the discharging pressure, and to reliably discharge the fluid even under the condition where the pressure on the discharging side is high.
  • the piezoelectric element can be formed only by the pump body and the diaphragm having the piezoelectric element bonded thereto, and an auxiliary component, such as a check valve, is unnecessary. This makes it possible to realize a small, thin, and highly reliable piezoelectric pump having a very simple structure.
  • FIG. 1 is a general perspective view of a piezoelectric pump according to a first embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the piezoelectric pump shown in FIG. 1 .
  • FIG. 3 includes cross-sectional views of the piezoelectric pump shown taken along line A-A in FIG. 1 , showing a pumping operation in a tertiary resonance mode.
  • FIG. 4 includes cross-sectional views of the piezoelectric pump taken along line A-A in FIG. 1 , showing a pumping operation in a primary resonance mode.
  • FIG. 5 includes cross-sectional views showing a pumping operation of a piezoelectric pump according to a second embodiment of the present invention.
  • FIG. 6 includes cross-sectional views showing a pumping operation of a piezoelectric pump according to a third embodiment of the present invention.
  • FIG. 7 is a perspective view of a piezoelectric pump according to a fourth embodiment of the present invention.
  • FIGS. 1 to 3 show a piezoelectric pump according to a first embodiment.
  • FIG. 1 is a general perspective view of a piezoelectric pump according to the present invention
  • FIG. 2 is an exploded perspective view of the piezoelectric pump shown in FIG. 1
  • FIG. 3 is a cross-sectional view, taken along line A-A in FIG. 1 .
  • a piezoelectric pump P has a structure in which a top plate 10 that forms a pump body, a diaphragm 20 , and an annular presser plate 30 are stacked in order, and these stacked components are bonded together.
  • the top plate 10 is shaped like a flat plate having rigidity.
  • a first opening 11 is provided at the center of the top plate 10 , and a plurality of second openings 12 are provided on the same circumference centered on the first opening 11 . While eight second openings 12 are provided so as to ensure the flow rate herein, the number of second openings 12 can be arbitrarily set in accordance with the required flow rate.
  • the diaphragm 20 is formed by a thin metal plate having spring elasticity. As shown in FIG. 2 , the diaphragm 20 has a plurality of arc-shaped slits 21 . An adhesive is applied on front and back surfaces of a region outside the slits 21 , and the outside region of the diaphragm 20 is bonded and fixed by the top plate 10 and the presser plate 30 . Since the region in which the adhesive is applied is separated by the slits 21 , the adhesive will not spread to a circular region 22 inside the slits 21 . An inner peripheral edge 31 of the presser plate 30 has a diameter slightly smaller than the diameter of the circular region 22 of the diaphragm 20 , and the circular region 22 surrounded by the inner peripheral edge 31 is bendable.
  • the diaphragm 20 is placed in contact with a lower surface of the top plate 10 .
  • a circular piezoelectric element 23 is bonded onto a back surface (lower surface) of the diaphragm 20 and at the center of the circular region 22 .
  • the center of the circular region 22 of the diaphragm 20 (center of the piezoelectric element 23 ) is coaxial with the center of the first opening 11 of the top plate 10 . Since the radius of the piezoelectric element 23 is smaller than the distance L between the first opening 11 and the second openings 12 , the second openings 12 are outside the piezoelectric element 23 . It is preferable that the second openings 12 be provided at the same position as a maximum displacement position where the diaphragm 20 is maximally displaced in a tertiary resonance mode or a position slightly shifted outward from the maximum displacement position.
  • the thickness of the presser plate 30 is larger than the sum of the thickness of the piezoelectric element 23 , which will be described below, and the displacement amount of the diaphragm 20 . This prevents the piezoelectric element 23 from touching a substrate or the like when the piezoelectric pump P is mounted on the substrate.
  • a cut groove 32 is provided in a portion of the presser plate 30 . This groove prevents an enclosed space from being formed on the lower side of the diaphragm 20 when the piezoelectric pump P is mounted on a substrate or the like, and allows a wire to be led out to the piezoelectric element therefrom.
  • a piezoelectric ceramic single plate having electrodes on its front and back surfaces is used as the piezoelectric element 23 , and is bonded to the back surface of the diaphragm 20 (surface opposite the top plate 10 ) so as to define a unimorph vibrating plate serving as a displacement member. Since the piezoelectric element 23 is expanded and contracted in a planar direction by the application of an alternating voltage (sinusoidal wave or rectangular wave), the diaphragm 20 including the piezoelectric element 23 entirely bends in the thickness direction.
  • the diaphragm 20 When driving is performed in a tertiary resonance mode (about 15 kHz) of the displacement member defined by the diaphragm and the piezoelectric element, the diaphragm 20 bends so as to be maximally displaced at a peripheral portion substantially corresponding to the second openings 12 .
  • the diaphragm 20 bends so as to be maximally displaced at the center portion. It is preferable that the voltage applied to the piezoelectric element 23 be about ⁇ 60 V (120 Vpp) to ⁇ 120 V (240 Vpp).
  • FIGS. 3( a ) to 3 ( e ) show a pumping operation in the tertiary resonance mode of the piezoelectric pump P, that is, an operation performed when a voltage close to a tertiary resonance frequency is applied to the piezoelectric element 23 .
  • FIG. 3( a ) shows an initial state, in which the entire surface of the diaphragm 20 is in contact with the pump body 10 and the first opening 11 and the second openings 12 are closed.
  • FIG. 3( b ) shows the first quarter period of the voltage applied to the piezoelectric element 23 .
  • the diaphragm 20 convexly bends upward, a center portion of the diaphragm 20 is pressed against the pump body 10 , and a peripheral portion of the diaphragm 20 separates from the pump body 10 . For this reason, the first opening 11 remains closed. However, since an annular pocket space is formed between the peripheral portion of the diaphragm 20 and the pump body 10 , fluid is drawn into the pocket space from the second openings 12 .
  • the mass of a region of the diaphragm 20 on which the piezoelectric element 23 is bonded is larger than that of a region on which the piezoelectric element 23 is not bonded, because of the presence of the piezoelectric element 23 , and a greater inertia effect is provided. Therefore, as shown in FIG. 3( c ), the diaphragm 20 returns to a flat state on a side closer to the diaphragm (lower side) than the initial state, corresponding to the position of center of gravity of the piezoelectric element 23 .
  • the piezoelectric element 23 attempts to return to a flat state. However, a pocket space thinner than the pocket space shown in FIG. 3( c ) is formed, because of the position of center of gravity of the piezoelectric element 23 . The outflow of the fluid continues until the diaphragm 20 is brought into contact with the first opening 11 again, as show in FIG. 3( b ). Then, the operation of the diaphragm 20 returns to the operation shown in FIG. 3( b ), and the operations shown in FIGS. 3( b ) to 3 ( e ) are repeated periodically. When the piezoelectric element 23 is thus driven in the tertiary resonance mode, the fluid can be drawn in from the second openings 12 and can be discharged from the first opening 11 provided at the center.
  • FIGS. 4( a ) to 4 ( d ) show a pumping operation in a primary resonance mode of the piezoelectric pump P.
  • FIG. 4( a ) shows an initial state
  • FIG. 4( b ) shows the first quarter period of the voltage applied to the piezoelectric element 23 . Since the diaphragm 20 convexly bends downward, a pocket space is formed between the center portion of the diaphragm 20 and the pump body 10 , and fluid is drawn into the pocket space from the first openings 11 .
  • the mass of the region of the diaphragm 20 on which the piezoelectric element 23 is bonded is larger than that of the region on which the piezoelectric element 23 is not bonded, because of the presence of the piezoelectric element 23 , and a greater inertia effect is provided. Therefore, as shown in FIG. 4( c ), the diaphragm 20 returns to a flat state on a side slightly closer to the diaphragm than the initial state, corresponding to the position of center of gravity of the piezoelectric element 23 . In this case, the fluid is transferred toward the outer periphery in the pocket space formed between the diaphragm 20 and the pump body 10 .
  • both the first opening 11 and the second openings 12 are open slightly.
  • the diaphragm 20 convexly bends upward. Therefore, the center portion of the diaphragm 20 is pressed against the pump body 10 , and the first opening 11 is closed. For this reason, the fluid between the diaphragm 20 and the pump body 10 is collected to the peripheral portion, and is pushed out from the second openings 12 .
  • the piezoelectric element 23 is going to return to a flat state, as shown in FIG. 4( e )
  • downward inertia is generated in the piezoelectric element 23 , and a pocket space thinner than the pocket space shown in FIG.
  • Diaphragm SUS plate having a thickness of 0.1 mm
  • Piezoelectric Element a PZT plate having a diameter of 12.7 mm
  • Diameter of First Opening 1.3 mm
  • Diameter of Second Openings 0.8 mm ⁇ 8 openings
  • Diameter of Displacement Region of Diaphragm 20 mm
  • FIG. 5 shows a pumping operation in a tertiary resonance mode according to a second embodiment of the present invention.
  • the same components as those shown in FIG. 3 are denoted by the same reference numerals, and redundant descriptions thereof are omitted.
  • the second openings 12 are provided in the pump body 10 in the first embodiment
  • second openings 25 are provided in a diaphragm 20 in this embodiment.
  • fluid can be drawn in from the second openings 25 on the back side of a piezoelectric pump and can be discharged from a first opening 11 on the front side.
  • This structure is suitable for an air supply pump in a fuel cell or a cooling pump.
  • FIG. 6 shows a pumping operation in a tertiary resonance mode according to a third embodiment of the present invention.
  • the same components as those shown in FIG. 3 are denoted by the same reference numerals, and redundant descriptions thereof are omitted.
  • a part of a pump body 10 extends outward from a diaphragm 20 , and a second opening 16 shaped like a concave groove is provided on a lower side of an extending portion 15 so as to extend from an inner side of an outer peripheral portion to an outer side of the diaphragm 20 .
  • An inner edge of the second opening 16 is provided outside the outer periphery of a piezoelectric element 23 and inside a fixed outer peripheral portion of the diaphragm 20 , and an outer edge thereof is open on the lower side from the extending portion 15 .
  • the second opening 16 does not always need to be shaped like a concave groove, and may be formed by a communicating hole that is open outside the piezoelectric element 23 and inside the fixed outer peripheral portion of the diaphragm 20 at an inner edge and that is open outside the fixed outer peripheral portion of the diaphragm 20 at an outer edge.
  • FIG. 7 shows a fourth embodiment of the present invention.
  • second openings 12 are holes each shaped like an arc centered on a first opening 11 . Since a plurality of second openings 12 are also arranged in the form of a circumference in this case, an annular pocket space formed between a peripheral portion of a diaphragm and a pump body can be quickly filled with fluid, and the flow rate can be increased.
  • the piezoelectric pump shown in FIG. 2 has a structure in which the top plate, the diaphragm, and the presser plate are stacked, the structure is not limited thereto. Further, the outer shape of the top plate, the diaphragm, and the presser plate do not always need to be rectangular, but may be circular.
  • a shallow concave portion may be provided in the pump body so that a narrow space (pump chamber) is formed between the diaphragm and the pump body.
  • the first opening and the second openings be closed by the diaphragm in the initial state.
  • the piezoelectric pump of the present invention is used as a pump for transporting compressible fluid, such as air, in the above-described embodiments, it is also applicable to imcompressible fluid such as liquid. Since the piezoelectric pump of the present invention has a high discharging pressure, for example, it can be used as a compressor pump in a cooling device.
US12/367,084 2006-12-09 2009-02-06 Piezoelectric Pump Abandoned US20090148318A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006332692 2006-12-09
JP2006-332692 2006-12-09
PCT/JP2007/073555 WO2008069264A1 (ja) 2006-12-09 2007-12-06 圧電ポンプ

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/073555 Continuation WO2008069264A1 (ja) 2006-12-09 2007-12-06 圧電ポンプ

Publications (1)

Publication Number Publication Date
US20090148318A1 true US20090148318A1 (en) 2009-06-11

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Application Number Title Priority Date Filing Date
US12/367,084 Abandoned US20090148318A1 (en) 2006-12-09 2009-02-06 Piezoelectric Pump

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US (1) US20090148318A1 (zh)
EP (1) EP2037124A1 (zh)
JP (1) JP4730437B2 (zh)
KR (1) KR101033077B1 (zh)
CN (1) CN101490419B (zh)
CA (1) CA2654688C (zh)
WO (1) WO2008069264A1 (zh)

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US20090168353A1 (en) * 2007-12-28 2009-07-02 Sony Corporation Electronic apparatus
US20100074775A1 (en) * 2007-01-23 2010-03-25 Mitsuru Yamamoto Diaphragm pump
US20130266461A1 (en) * 2011-04-11 2013-10-10 Murata Manufacturing Co., Ltd. Actuator support structure and pump device
US20130280105A1 (en) * 2012-04-19 2013-10-24 Christopher Brian Locke Disc pump with perimeter valve configuration
US20130323085A1 (en) * 2011-10-11 2013-12-05 Murata Manufacturing Co., Ltd. Fluid control apparatus and method for adjusting fluid control apparatus
US8747080B2 (en) 2010-05-21 2014-06-10 Murata Manufacturing Co., Ltd. Fluid pump
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US9028226B2 (en) 2011-09-06 2015-05-12 Murata Manufacturing Co., Ltd. Fluid control device
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CA2654688C (en) 2011-07-26
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CN101490419A (zh) 2009-07-22
WO2008069264A1 (ja) 2008-06-12
KR101033077B1 (ko) 2011-05-06
KR20090057215A (ko) 2009-06-04
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EP2037124A1 (en) 2009-03-18
JP4730437B2 (ja) 2011-07-20

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