WO2010090169A1 - 霧化部材及びそれを備える霧化器 - Google Patents
霧化部材及びそれを備える霧化器 Download PDFInfo
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- WO2010090169A1 WO2010090169A1 PCT/JP2010/051386 JP2010051386W WO2010090169A1 WO 2010090169 A1 WO2010090169 A1 WO 2010090169A1 JP 2010051386 W JP2010051386 W JP 2010051386W WO 2010090169 A1 WO2010090169 A1 WO 2010090169A1
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- WIPO (PCT)
- Prior art keywords
- piezoelectric body
- vibration
- atomizer
- piezoelectric
- vibrating membrane
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
- B05B17/0646—Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M1/00—Stationary means for catching or killing insects
- A01M1/20—Poisoning, narcotising, or burning insects
- A01M1/2022—Poisoning or narcotising insects by vaporising an insecticide
- A01M1/2027—Poisoning or narcotising insects by vaporising an insecticide without heating
- A01M1/2044—Holders or dispensers for liquid insecticide, e.g. using wicks
- A01M1/205—Holders or dispensers for liquid insecticide, e.g. using wicks using vibrations, e.g. ultrasonic or piezoelectric atomizers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/14—Disinfection, sterilisation or deodorisation of air using sprayed or atomised substances including air-liquid contact processes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
- A61L2209/10—Apparatus features
- A61L2209/13—Dispensing or storing means for active compounds
- A61L2209/132—Piezo or ultrasonic elements for dispensing
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention relates to an atomizing member, and more particularly, to an ultrasonic atomizing member using a piezoelectric vibrator and an atomizer including the same.
- Patent Document 1 A cross-sectional view of the atomizer described in Patent Document 1 is shown in FIG.
- the atomizer 100 includes a base body 101 in which a pressurizing chamber 102 filled with a liquid to be atomized is formed.
- a nozzle plate 103 is fixed to the base 101 so as to close the upper opening 102 a of the pressurizing chamber 102.
- a number of nozzle holes are formed in the center of the nozzle plate 103.
- a disc-shaped piezoelectric vibrator 104 having an opening 104a formed at the center is mounted.
- the piezoelectric vibrator 104 includes a disk-shaped piezoelectric body 105 and first and second electrodes 106 and 107.
- the first and second electrodes 106 and 107 are provided on the upper surface 105a and the lower surface 105b of the piezoelectric body 105, and the piezoelectric vibrator 104 is configured to vibrate due to a lateral effect. That is, the piezoelectric vibrator 104 vibrates in the radial direction.
- the piezoelectric vibrator 104 vibrates due to the lateral effect, so that the nozzle plate 103 flexibly vibrates in a direction z perpendicular to the plate surface direction of the piezoelectric vibrator 104. .
- the liquid filled in the pressurizing chamber 102 is sprayed from the nozzle holes formed in the nozzle plate 103.
- Patent Document 1 listed below can provide an atomizer 100 that has a simple structure, is compact, has excellent atomization performance, and has low power consumption by using a piezoelectric vibrator 104 that vibrates due to a lateral effect. Is described.
- Patent Document 1 when a piezoelectric vibrator that vibrates due to a lateral effect is used, it is difficult to sufficiently increase the atomization efficiency, and thus it is difficult to sufficiently reduce power consumption. There was a problem that there was.
- An object of the present invention is to provide an atomization member using a piezoelectric vibrator, which has high atomization efficiency and can reduce power consumption, and an atomizer including the atomization member.
- the atomizing member according to the present invention includes a piezoelectric vibrator and a vibration film.
- the piezoelectric vibrator has a cylindrical piezoelectric body, a first electrode, and a second electrode.
- the first electrode is formed on the inner peripheral surface of the piezoelectric body.
- the second electrode is formed on the outer peripheral surface of the piezoelectric body.
- the piezoelectric vibrator vibrates cylindrically.
- the vibration film is provided at an opening on one end side in the axial direction of the piezoelectric body so as to cover the opening on one end side in the axial direction of the piezoelectric body.
- a through hole is formed at the center of the vibration film.
- the piezoelectric body and the vibration film are integrally formed. According to this configuration, not only the piezoelectric vibrator can be easily manufactured, but also the vibration efficiency of the piezoelectric vibrator can be improved.
- the piezoelectric vibrator is connected to a portion on one end side in the axial direction of the piezoelectric body, and the flange extends radially outward from the portion on the one end side.
- the atomizing member can be attached to the flange portion, the atomizing member can be easily attached.
- the flange portion is connected to a portion on one end side in the axial direction of the piezoelectric body with a small amount of vibration displacement, even when the atomizing member is attached to the flange portion, the vibration of the piezoelectric body is suppressed. Hard to block. Accordingly, it is possible to suppress a decrease in vibration efficiency associated with the attachment of the atomizing member to the other member.
- the flange portion is formed integrally with the piezoelectric body. According to this configuration, not only can the piezoelectric vibrator having the flange portion be easily manufactured, but also the vibration efficiency of the piezoelectric vibrator can be improved.
- connection portion of the flange portion with the piezoelectric body is different in vibration propagation characteristics from other portions of the flange portion.
- the vibration of the piezoelectric body is reflected at the connection portion of the lung portion with the piezoelectric body. Therefore, the vibration of the piezoelectric body is not transmitted to the portion outside the connection portion of the flange portion. Accordingly, it is possible to suppress a decrease in vibration efficiency caused by providing the flange portion and a decrease in vibration efficiency caused by fixing the flange portion to another member.
- the freedom degree of design of a flange part can be raised.
- a groove is formed in a connection portion between the flange portion and the piezoelectric body.
- the vibration of the piezoelectric body is separated at the connection portion where the groove is formed. Therefore, the vibration of the piezoelectric body is not transmitted to the portion outside the connection portion of the flange portion. Accordingly, it is possible to suppress a decrease in vibration efficiency caused by providing the flange portion and a decrease in vibration efficiency caused by fixing the flange portion to another member. Moreover, the freedom degree of design of a flange part can be raised.
- the piezoelectric vibrator includes a first electrode pad connected to the first electrode and a second electrode connected to the second electrode.
- the first electrode pad and the second electrode pad are formed on the surface of the flange portion on the other end side in the axial direction of the piezoelectric body.
- the central portion in which the through hole of the vibrating membrane is formed is configured by a through hole forming member separate from the other portions of the vibrating membrane.
- the through-hole forming member can be manufactured separately from the other parts of the vibration film, the vibration film can be easily manufactured.
- the material of the through hole forming member and the other part of the vibration film can be made different. Accordingly, the degree of freedom in designing the through-hole forming member and the other part of the diaphragm is improved, and it is easy to make the through-hole forming member and the other part of the diaphragm more suitable for the required characteristics of each member. It becomes.
- the through-hole forming member is made of metal.
- the through-hole can be easily formed as compared with the case where the member constituting the central portion where the through-hole of the vibrating membrane is formed is made of ceramic. Therefore, the vibration film can be easily manufactured.
- the through-hole formed member is formed of the same material as the portion other than the through-hole formed member of the vibration film.
- An atomizer according to the present invention includes the atomization member according to the present invention, an atomizer body, and a liquid supply unit.
- a piezoelectric vibrator is attached to the atomizer body.
- the atomizer body is formed with a reservoir for storing the liquid.
- the liquid supply unit supplies the liquid stored in the storage unit to a portion where the through hole of the vibration film is formed.
- the liquid supply unit supplies the liquid to the vibrating membrane from the other end side in the axial direction of the piezoelectric body. According to this configuration, the diffusion angle generated in the vibration film can be increased.
- the piezoelectric vibrator is connected to a portion on one end side in the axial direction of the piezoelectric body, and extends radially outward from the one end side portion.
- the outer edge portion in the radial direction has a flange portion supported by the atomizer body, and the flange portion is formed with a plurality of through holes extending along the circumferential direction so that the outer edge portion and the diaphragm are At least two bridging portions that are connected are formed, and the length along the radial direction of each of the at least two bridging portions is 30% to 50%, 70% to 90% of the radius of the vibrating membrane, or It is in the range of 115% to 120%.
- the both sides in the circumferential direction of the portion where the bridging portion of the vibrating membrane is connected have a notch that reaches the center in the thickness direction of the piezoelectric body.
- the part formed and located between the notches in the circumferential direction of the bridging part is not connected to the piezoelectric body.
- the central part in the thickness direction of the piezoelectric body becomes a node. For this reason, according to this configuration, the vibration film can be supported at the node. Therefore, better atomization characteristics can be obtained.
- the piezoelectric body is disposed below the vibrating membrane in the vertical direction.
- the vibration film is positioned below the outer edge due to the weight of the piezoelectric body.
- the bridging portion and the piezoelectric body are separated from each other. Therefore, contact between the bridging portion and the piezoelectric body is suppressed. Therefore, wear of the bridging portion can be suppressed. As a result, the lifetime of the atomizer can be extended.
- the vibration membrane is driven by the cylindrical breathing vibration of the cylindrical piezoelectric body, the vibration efficiency of the vibration membrane is increased, so that the atomization efficiency can be increased and the power consumption can be decreased.
- FIG. 1 is a schematic exploded perspective view of an atomizer according to the first embodiment.
- FIG. 2 is a schematic cross-sectional view of the atomizer of the first embodiment.
- FIG. 3 is a schematic plan view of the elastic plate and the piezoelectric vibrator.
- FIG. 4 is a schematic cross-sectional view in which a part of the vibrating membrane is enlarged.
- FIG. 5 is a schematic diagram for explaining a mode of cylindrical respiratory vibration of the piezoelectric vibrator.
- FIG. 6 is a schematic cross-sectional view of an atomizer according to the second embodiment.
- FIG. 7 is a schematic perspective view of an atomizing member in the second embodiment.
- FIG. 8 is a schematic perspective view of an atomizing member in a modified example.
- FIG. 9 is a cross-sectional view of the atomizer described in Patent Document 1.
- FIG. 10 is a cross-sectional view for explaining the operation of the piezoelectric vibrator and the nozzle plate of the atomizer described in Patent Document 1. Specifically, it is a cross-sectional view of the piezoelectric vibrator and the nozzle plate in a state where the piezoelectric vibrator extends in the lateral direction.
- FIG. 11 is a cross-sectional view for explaining the operation of the piezoelectric vibrator and nozzle plate of the atomizer described in Patent Document 1. Specifically, it is a sectional view of the piezoelectric vibrator and the nozzle plate in a state where the piezoelectric vibrator is contracted in the lateral direction.
- FIG. 10 is a cross-sectional view for explaining the operation of the piezoelectric vibrator and the nozzle plate of the atomizer described in Patent Document 1. Specifically, it is a cross-sectional view of the piezoelectric vibrator and the nozzle plate in
- FIG. 12 is a schematic cross-sectional view of an atomizer according to a second modification.
- FIG. 13 is a schematic cross-sectional view of an atomizer according to a third modification.
- FIG. 14 is a schematic exploded perspective view of an atomizer according to a third embodiment.
- FIG. 15 is a schematic cross-sectional view of an atomizer according to a third embodiment.
- FIG. 16 is a graph showing the impedance characteristics of the atomizing member when the ratio (L / r) of the length (L) along the radial direction of the bridging portion to the radius (r) of the vibrating membrane is 80%. is there.
- FIG. 16 is a graph showing the impedance characteristics of the atomizing member when the ratio (L / r) of the length (L) along the radial direction of the bridging portion to the radius (r) of the vibrating membrane is 80%. is there.
- FIG. 17 is a graph showing the impedance characteristics of the atomizing member when the ratio (L / r) of the length (L) along the radial direction of the bridging portion to the radius (r) of the vibrating membrane is 100%. is there.
- FIG. 18 is a graph showing the relationship between the ratio (L / r) of the length (L) along the radial direction of the bridging portion to the radius (r) of the vibrating membrane and the presence or absence of spurious.
- FIG. 19 is a schematic plan view of an atomizing member in a fourth modification.
- FIG. 20 is a schematic cross-sectional view of a part of an atomizer in a fourth modification.
- FIG. 1 is a schematic exploded perspective view of an atomizer according to the present embodiment.
- FIG. 2 is a schematic cross-sectional view of the atomizer of the present embodiment.
- the atomizer 1 includes an atomizing member 30, an atomizer body 10, and a liquid supply unit 20.
- the atomizer 1 may further include, for example, a circuit that drives the atomization member 30.
- the circuit that drives the atomizing member 30 includes, for example, an oscillation circuit, a control circuit for the oscillation circuit, a power supply circuit that supplies power to each circuit, and the like.
- the atomizer body 10 can be formed of, for example, synthetic resin, metal, glass, ceramic, paper, or the like. As shown in FIG. 2, a reservoir 11 is formed inside the atomizer body 10.
- the storage unit 11 stores a liquid 12 to be atomized.
- the liquid 12 is not particularly limited. Specific examples of the liquid 12 include water, aqueous solutions, organic solvents such as alcohol and petroleum.
- the liquid 12 may be, for example, a fragrance, a deodorant, an insecticide, an insect repellent, a perfume, a lotion, or a detergent.
- An atomizing member 30 is attached on the atomizer body 10 via an elastic film 15. But the atomization member 30 may be directly attached to the atomizer main body 10. FIG.
- the atomizing member 30 includes a cylindrical piezoelectric vibrator 31 and a vibration film 40.
- the piezoelectric vibrator 31 includes a cylindrical piezoelectric body 32.
- the piezoelectric body 32 is made of a piezoelectric material.
- the piezoelectric material for forming the piezoelectric body 32 is not particularly limited. Specific examples of the piezoelectric material include lead zirconate titanate (PZT) ceramics.
- the dimensions of the piezoelectric body 32 are not particularly limited. The dimensions of the piezoelectric body 32 can be, for example, an inner diameter: 10 mm, an outer diameter: 12 mm, and a height: 3.5 mm.
- a first electrode 33 is formed on the inner peripheral surface of the piezoelectric body 32.
- a second electrode 34 is formed on the outer peripheral surface of the piezoelectric body 32.
- the piezoelectric body 32 is polarized in the radial direction of the piezoelectric body 32 by applying a voltage of about 3 kV / mm between the first and second electrodes 33 and 34, for example. Therefore, the piezoelectric vibrator 31 vibrates in the radial direction of the piezoelectric body 32 (hereinafter referred to as “cylindrical respiratory vibration”) when an AC voltage is applied between the first and second electrodes 33 and 34. To do.
- This cylindrical respiratory vibration is caused by at least one of the d31 mode and the d33 mode, and specifically, is a vibration having a mode as shown in FIG. That is, as shown in FIGS. 5A to 5C, when a voltage is applied, the cylindrical piezoelectric body 32 repeatedly expands and contracts due to the piezoelectric effect. Along with this, the vibration film 40 vibrates in the vertical direction z.
- the vibration of the piezoelectric body 32 may be self-excited or separately excited. However, in the case of separate excitation, when a liquid adheres to the surface of the piezoelectric vibrator 31, the resonance frequency changes, so a control circuit for preventing the frequency from changing is necessary. Therefore, the vibration of the piezoelectric body 32 is preferably self-excited.
- the waveform of the voltage applied to the piezoelectric body 32 may be, for example, a sine wave, a sawtooth wave, a square wave, or the like.
- the waveform of the voltage applied to the piezoelectric body 32 is preferably a square wave. This is because higher atomization efficiency can be obtained by applying a square wave to the piezoelectric body 32.
- the on / off control of the atomization is performed by controlling the voltage applied to the piezoelectric body 32, but the waveform of the voltage applied to the piezoelectric body 32 may be AM modulated or FM modulated. .
- the first and second electrodes 33 and 34 are not particularly limited as long as a voltage can be applied to the piezoelectric body 32.
- the first and second electrodes 33 and 34 can be formed of, for example, a metal such as Ag, Cu, Au, Pt, Ni, or Sn, or an alloy such as a Cr / Ni alloy or a Ni / Cu alloy.
- a protective film may be formed on the surfaces of the first and second electrodes 33 and 34.
- the protective film is not particularly limited as long as it has higher water resistance than the first and second electrodes 33 and 34.
- the protective film can be formed of an elastic resin such as a silicone resin, a polyurethane resin, or a polyester resin.
- Examples of the formation method of the first and second electrodes 33 and 34 include a thin film formation method such as sputtering, vapor deposition, and plating, and a method using a conductive paste.
- a vibrating membrane 40 is attached to the opening 32a on one side in the axial direction A of the piezoelectric body 32 so as to cover the opening 32a.
- the vibration film 40 is attached to one end face 32 b in the axial direction A of the piezoelectric body 32.
- the vibration film 40 is not necessarily provided outside the piezoelectric body 32.
- the vibration film 40 may be provided inside the piezoelectric body 32, that is, in a hollow portion of the cylindrical piezoelectric body 32.
- the thickness of the vibration film 40 is not particularly limited, but can be, for example, about 0.5 mm.
- the vibration film 40 is a film that vibrates in the vertical direction z when the piezoelectric body 32 vibrates.
- the vibration film 40 is not particularly limited as long as it is a film that can vibrate in the vertical direction z, but is preferably a film that mainly vibrates in the primary mode (fundamental mode) as the piezoelectric vibrator 31 vibrates.
- the displacement amount of the vibration film 40 can be increased. Therefore, the atomizable region of the vibration film 40 can be increased. Therefore, the quantity of the through-hole 43 mentioned later can be increased over a wide area
- the material of the vibration film 40 is not particularly limited, but the vibration film 40 can be formed of a material such as resin, ceramic, or metal. Especially, it is preferable that the vibration film 40 is made of ceramic. According to this, since the vibration film 40 can be thickened, the dominant vibration mode of the vibration film 40 can be easily changed to the primary mode. In addition, it is preferable that the vibration film 40 is formed of a metal material such as 42 alloy, phosphor bronze, or Western night because the vibration film 40 can be easily processed. In this case, since the vibration film 40 has conductivity, by electrically insulating a part of the vibration film 40, the vibration film 40 can be part of an electrical connection means with the piezoelectric body.
- the vibrating membrane 40 includes a membrane main body 41 attached to the end of the piezoelectric vibrator 31 and a through-hole forming member 42 that is separate from the membrane main body 41. ing.
- An opening 41a is formed at the center of the membrane body 41, and the through-hole forming member 42 is attached to the opening 41a.
- the material of the through-hole forming member 42 is not particularly limited.
- the through-hole forming member 42 can be formed of the same material as the film main body 41, for example.
- the shape of the through-hole forming member 42 is not particularly limited, but can be, for example, a diameter of about 4.9 mm and a thickness of about 0.05 mm.
- the opening 41a formed in the membrane body 41 is formed smaller than the diameter of the through hole forming member 42, and the through hole forming member 42 is pushed into the opening 41a.
- a through hole forming member 42 is fixed to the membrane body 41.
- the fixing method of the through-hole forming member 42 to the membrane body 41 is not particularly limited.
- the through-hole forming member 42 is formed of a resin film having low rigidity, the through-hole forming member 42 is penetrated by an adhesive or the like.
- the hole forming member 42 may be bonded to the membrane body 41.
- the through-hole forming member 42 is made of metal, it may be fixed by bonding to the ceramic film main body 41, or after the ceramic film main body 41 is plated. It may be fixed by welding, brazing, or soldering.
- the through-hole forming member 42 is formed with a plurality of through-holes (nozzle holes) 43 that penetrate the through-hole forming member 42 in the thickness direction.
- the through hole 43 is for generating mist from the liquid 12.
- the through hole 43 has a counterbore hole 43a, a connection part 43b, and a diameter-expanded part 43c.
- the counterbore hole portion 43 a is open to the lower surface 42 a of the through-hole forming member 42.
- the counterbore hole portion 43a is formed to taper from the lower surface 42a side toward the upper surface 42b side.
- the lower end portion of the counterbore hole portion 43a is connected to the connection portion 43b.
- the connecting portion 43b has a substantially cylindrical shape and has substantially the same diameter as the lower end portion of the counterbore hole portion 43a.
- the diameter of the connection part 43b can be appropriately set according to the viscosity of the liquid 12 to be atomized.
- the diameter of the connecting portion 43b can be set to about 5 to 20 ⁇ m, for example.
- the lower end part of the connection part 43b is connected to the enlarged diameter part 43c.
- the enlarged diameter portion 43c is formed in a columnar shape having a diameter larger than that of the connection portion 43b. In FIG. 2 and FIG. 6 to be described later, the through hole 43 is simply described in a columnar shape for convenience of drawing.
- the through hole 43 includes the counterbore hole portion 43a, the connection portion 43b, and the enlarged diameter portion 43c has been described.
- the shape of the through hole 43 is not limited to the shape of the present embodiment described above, and may be, for example, a tapered shape or a cylindrical shape.
- the film body 41 and the through-hole forming member 42 may be formed of the same material or different materials.
- the through-hole forming member 42 is preferably made of metal. This is because when the through-hole forming member 42 is made of metal, for example, the through-hole 43 can be formed more easily than when the through-hole forming member 42 is made of ceramic.
- the formation method of the through-hole 43 can be suitably selected according to the dimension of the through-hole 43, the material of the through-hole forming member 42, and the like.
- the through-hole forming member 42 is made of metal
- the through-hole 43 can be formed by, for example, an electroforming method or laser processing.
- the through-hole forming member 42 is made of resin
- the through-hole 43 is formed by a method using various lasers such as a green-YAG laser, a UV-YAG laser, and an excimer laser, or by chemical etching. It can form by the method of forming, the method of forming by press work, etc.
- the atomizing member 30 is supported by the elastic film 15.
- the elastic film 15 is attached to the atomizer body 10 by a ring-shaped restrainer 35.
- the material of the elastic film 15 is not particularly limited.
- the elastic film 15 can be formed of a resin such as a polyimide resin or a PET resin, for example.
- the elastic film 15 can also be constituted by a metal leaf spring, for example.
- the natural frequency of the elastic film 15 is, for example, 1 kHz or less, and is generally smaller than the driveable frequency of the piezoelectric body 32 (the natural frequency of the piezoelectric body 32 (for example, about 100 kHz) and its vicinity). Therefore, even when the atomizing member 30 is supported by the elastic film 15, the vibration of the atomizing member 30 does not substantially propagate to the elastic film 15. Accordingly, leakage of vibration energy to the elastic film 15 can be suppressed, and deterioration of energy efficiency due to the support of the atomizing member 30 can be suppressed.
- the elastic film 15 is formed in a disk shape. As shown in FIG. 2, an opening 16 that connects the first liquid supply unit 20 a and the second liquid supply unit 20 b is formed in the central portion of the elastic film 15. As shown in FIGS. 1 and 3, a plurality of arcuate openings 17 along the inner peripheral surface of the opening 16 are spaced apart from each other along the circumferential direction outside the opening 16 of the elastic film 15. Open and formed. By the plurality of openings 17, the elastic film 15 is partitioned into an inner part 15 a located inside the opening 17 and an outer part 15 b located outside the opening 17. The inner portion 15 a is connected to the outer portion 15 b by a plurality of bridging portions 18 formed between adjacent openings 17.
- the atomizer 1 is provided with a liquid supply unit 20.
- the liquid supply unit 20 allows the liquid 12 stored in the storage unit 11 to pass through the vibrating membrane 40. Supplied to the bottom side.
- the liquid supply unit 20 includes first and second liquid supply units 20a and 20b.
- the second liquid supply unit 20 b is supported by being inserted into the opening 10 a of the atomizer body 10.
- the lower end portion of the second liquid supply unit 20 b reaches the lower part of the storage unit 11.
- the upper end of the second liquid supply unit 20 b is in contact with the lower end surface of the elastic film 15.
- the first liquid supply unit 20 a is provided on the elastic film 15.
- the upper end of the first liquid supply unit 20 a is located immediately below the vibration film 40.
- the upper end of the first liquid supply unit 20 a is not in contact with the vibration film 40, and is between the upper end of the first liquid supply unit 20 a and the vibration film 40.
- a gap 13 is formed.
- the distance of the gap 13 can be appropriately set according to the viscosity of the liquid so that the gap 13 is filled with the liquid.
- the distance of the gap 13 can be set to about 0.05 to 1 mm, for example.
- the first and second liquid supply units 20a and 20b have a function of sucking up the liquid 12 by capillary action. For this reason, the liquid 12 stored in the storage unit 11 is sucked up by the second liquid supply unit 20b and supplied to the first liquid supply unit 20a. The liquid 12 supplied to the first liquid supply unit 20a is sucked up to the gap 13 by the first liquid supply unit 20a. Then, since the vibration film 40 exists on the gap 13, the liquid 12 sucked up by the first liquid supply unit 20 a is accumulated in the gap 13. As a result, the liquid 12 is supplied to the vibrating membrane 40.
- the first and second liquid supply units 20a and 20b are not particularly limited as long as they exhibit capillary action.
- the 1st and 2nd liquid supply parts 20a and 20b can be comprised with felt, a nonwoven fabric, a nonwoven paper, porous resin, etc., for example.
- the liquid supply unit to the vibrating membrane is not limited to one that exhibits capillary action.
- the liquid supply unit 20 includes liquid supply means such as a pump 20 d and a blower 20 e and a pipe 20 c for supplying liquid from the liquid supply means to the vibrating membrane 40. May be.
- the distance between the end of the tube 20c and the vibrating membrane 40 is preferably such that the end of the tube 20c and the vibrating membrane 40 do not interfere when the vibrating membrane 40 vibrates. It is more preferable that the distance is not more than the distance from the end portion to the maximum raised point due to the surface tension of the liquid.
- the piezoelectric vibrator 31 vibrates in a cylindrical breath as shown in FIG.
- the vibration film 40 vibrates and repeats displacement in the vertical direction z.
- the liquid 12 supplied to the gap 13 by the liquid supply part 20 passes through the through-hole 43 and diverges as fog.
- the aspect of the cylindrical respiratory vibration shown in FIG. 5 is an example.
- the aspect of the cylindrical respiratory vibration may vary depending on the frequency of the cylindrical respiratory vibration.
- the mode shown in FIG. 5 shows an example in which the vibration film 40 is displaced in a concave shape when a portion of the piezoelectric vibrator 31 opposite to the vibration film 40 is reduced in diameter.
- the vibration film 40 may be displaced in a convex shape when a portion of the piezoelectric vibrator 31 opposite to the vibration film 40 is reduced in diameter. That is, the vibration phase of the vibrating membrane 40 may be shifted by 180 ° depending on the frequency of the cylindrical respiratory vibration.
- the membrane vibration of the vibrating membrane 40 is excited by the cylindrical breathing vibration of the cylindrical piezoelectric body 32.
- the film vibration of the vibration film 40 can be excited with high efficiency compared to the case where the film vibration of the vibration film is excited by the lateral effect of the disk-shaped piezoelectric body. Therefore, high atomization efficiency can be realized. As a result, the power consumption of the atomizer 1 can be reduced.
- the vibration energy of the vibration film 40 can be increased with the same power consumption. For this reason, the maximum number of through holes that can be atomized increases. Therefore, the number of through holes 43 can be increased. As a result, a larger spray amount can be obtained with the same power consumption.
- the outer peripheral portion at the end portion along the axial direction of the piezoelectric body 32 becomes a node. That is, the displacement amount of the outer peripheral portion of the end portion in the axial direction of the piezoelectric body 32 in a state where the piezoelectric body 32 is vibrating is small. Accordingly, the piezoelectric vibrator 31 can be easily supported. Further, by supporting the end portion in the axial direction of the piezoelectric vibrator 31 as in the present embodiment, the vibration of the piezoelectric vibrator 31 is not inhibited by the elastic film 15 that is a support. Further, the vibration of the piezoelectric vibrator 31 is not easily transmitted to the elastic film 15. Accordingly, vibration damping can be suppressed and a decrease in vibration efficiency of the piezoelectric vibrator 31 due to the support can be suppressed. As a result, higher atomization efficiency and lower power consumption can be realized.
- the atomization voltage is about 20 Vpp, whereas the cylindrical respiratory vibration of the present embodiment.
- the atomization voltage can be lowered to, for example, about 10 Vpp.
- the power consumption is about several hundreds mW, whereas in the atomizer 1 using the piezoelectric body 32 that vibrates in the cylindrical breathing, The power consumption can be reduced to tens of mW or less. Also from this result, it can be seen that high atomization efficiency and low power consumption can be realized by using an elastic body that vibrates in cylindrical breathing as described above.
- the central portion where the through-hole 43 of the vibrating membrane 40 is formed is constituted by a separate through-hole forming member 42.
- the vibration film 40 can be easily manufactured.
- the material of the through-hole forming member 42 can be made different from the material of the membrane body 41. Accordingly, the degree of freedom in designing the membrane main body 41 and the through-hole forming member 42 is improved, and the membrane main body 41 and the through-hole forming member 42 can be more matched to the respective required characteristics. That is, the membrane body 41 can be more suitable for vibration, and the through-hole forming member 42 can be more suitable for atomization.
- the liquid supply unit 20 supplies the liquid 12 to the surface of the vibration film 40 on the side where the piezoelectric vibrator 31 is provided.
- the liquid supply unit 20 is disposed on the surface of the vibrating membrane 40 opposite to the side on which the mist diverges. Therefore, the mist divergence angle can be increased and sprayed over a wider area.
- FIG. 6 is a schematic cross-sectional view of the atomizer of the present embodiment.
- FIG. 7 is a schematic cross-sectional view of the atomizing member of the present embodiment.
- the atomizer 1a of this embodiment has substantially the same configuration as the atomizer 1 of the first embodiment except for the form of the atomization member 30 and the support mode of the atomization member 30. is doing.
- portions of the atomizing member 30 excluding the first and second electrodes 33 and 34 are integrally formed of ceramic.
- the vibration film 40, the piezoelectric body 32, and a flange portion 45 described later are integrally formed of piezoelectric ceramic. For this reason, it is not necessary to adhere
- vibration efficiency can be improved by integrally forming the vibration film 40, the piezoelectric body 32, and the flange portion 45. Accordingly, higher atomization efficiency and lower power consumption can be realized.
- the vibration film 40, the piezoelectric body 32, and the flange portion 45 may be configured separately from each other.
- the piezoelectric vibrator 31 is provided with a ring-shaped flange portion 45.
- the flange portion 45 is connected to the upper end portion of the piezoelectric body 32, and extends outward from the piezoelectric body 32 in a direction substantially parallel to the upper end surface of the piezoelectric body 32.
- the flange portion 45 is attached to the atomizer body 10.
- the attachment of the piezoelectric vibrator 31 to the atomizer body 10 is facilitated.
- the flange portion 45 is connected to the outer peripheral portion of the end portion in the axial direction A of the piezoelectric body 32 with a small amount of displacement during vibration. For this reason, even when the flange portion 45 is fixed, the vibration of the piezoelectric body 32 is not easily inhibited. Therefore, it is possible to suppress the deterioration of the vibration efficiency accompanying the fixing of the piezoelectric vibrator 31.
- the flange portion 45 is formed in an annular shape. Therefore, the vibration of the piezoelectric body 32 is less likely to be inhibited.
- an annular groove 45a is formed in the connecting portion 45b of the flange portion 45 with the piezoelectric body 32.
- the thickness of the part in which the groove 45a of the connection part 45b is formed is made thinner than the thickness of the other part of the flange part 45. Therefore, the vibration of the piezoelectric body 32 is less likely to be inhibited, and the deterioration of the vibration efficiency is more effectively suppressed.
- the vibration of the piezoelectric body 32 is reflected, and the vibration can be effectively confined in the piezoelectric body 32. Therefore, the transmission efficiency of the vibration of the piezoelectric body 32 to the vibration film 40 can be further increased.
- the groove 45 a is formed in a ring shape around the entire piezoelectric body 32.
- the groove 45 a may be formed only in a part around the piezoelectric body 32.
- the groove 45 a is formed in the lower surface 45 c of the flange portion 45.
- the groove may be formed on the upper surface 45d of the flange portion 45, or may be formed on both the upper surface 45d and the lower surface 45c.
- a plurality of grooves may be formed at different locations in the radial direction of the piezoelectric body 32.
- an opening may be formed in the flange portion 45.
- the minimum value of the thickness of the flange portion 45 in the portion where the groove 45a is formed is about 0.2 to 0.5 times the thickness of the portion of the flange portion 45 where the groove is not formed. It is preferable.
- the flange portion 45 it is possible to suppress the generated mist from adhering to the surfaces of the first and second electrodes 33 and 34. Therefore, even when the piezoelectric vibrator 31 vibrates at a high frequency, deterioration of the first and second electrodes 33 and 34 due to cavity erosion can be effectively suppressed.
- the first and second electrodes 33 and 34 are connected to the first and second electrode pads 48 and 49 by first and second wirings 46 and 47, respectively. Both the first and second electrode pads 48 and 49 are formed on the lower surface 45 c of the flange portion 45. For this reason, in this embodiment, the deterioration resulting from the cavity erosion of the first and second electrode pads 48 and 49 is also effectively suppressed.
- the second electrode 34 is formed on a portion of the outer peripheral surface of the piezoelectric body 32 excluding a part in the circumferential direction.
- the first wiring 46 that connects the first electrode 33 and the first electrode pad 48 is formed on the outer peripheral surface of the piezoelectric body 32 where the second electrode 34 is not formed.
- the flange portion 45 has an annular shape.
- the shape of the flange portion is not particularly limited.
- the flange portion 45 may be formed in a substantially rectangular shape.
- the example in which the vibration of the piezoelectric body 32 is not transmitted to the flange portion 45 by forming the annular groove 45a in the connecting portion 45b of the flange portion 45 with the piezoelectric body 32 has been described.
- the method of preventing the vibration of the piezoelectric body 32 from being transmitted to the flange portion 45 is not limited to the method of forming the annular groove 45a.
- a protrusion examples thereof include a method of forming a ring-shaped or ring-shaped projection with a part cut away, a method of attaching another member to the connecting portion 45b, a method of forming a hole (ring-shaped or ring-shaped hole with a part cut away), and the like.
- FIG. 14 is a schematic exploded perspective view of an atomizer according to a third embodiment.
- FIG. 15 is a schematic cross-sectional view of an atomizer according to a third embodiment.
- the atomizer 1b of this embodiment is the same as the atomizer 1a of the second embodiment, the point that the elastic film 15 is not provided, and the liquid supply unit 20 is integrally formed, and the atomization member 30. It differs in the structure of.
- the structure of the atomization member 30 in this embodiment is demonstrated, referring FIG.14 and FIG.15.
- the atomizing member 30 is formed with a plurality of through holes 45e extending along the circumferential direction and arranged along the circumferential direction. Due to the plurality of through holes 45e, the flange portion 45 has at least two bridging portions connecting the outer edge portion 45g which is a portion supported by the atomizer body 10 of the flange portion 45 and the vibrating membrane 40. 45f (see FIG. 14) is formed. At least two bridging portions 45f are provided at equal intervals along the circumferential direction. In the present embodiment, specifically, two bridging portions 45f are provided. However, in the present invention, the number of cross-linked parts is not particularly limited. For example, 2 to 4 cross-linking portions may be provided.
- the width (W) of the bridging portion 45f shown in FIG. 14 is not particularly limited.
- the width (W) of the bridging portion 45f can be, for example, about 0.05 to 0.7 times the length (L) along the radial direction of the bridging portion 45f shown in FIG.
- the length (L) along the radial direction of the bridging portion 45f is in the range of 30% to 50%, 70% to 90%, or 115% to 120% of the radius (r) of the vibrating membrane 40. Is within. For this reason, it can suppress effectively that the resonance of the frequency close
- FIG. 16 is a graph showing the impedance characteristics of the atomizing member when the ratio (L / r) of the length (L) along the radial direction of the bridging portion to the radius (r) of the vibrating membrane is 80%. is there.
- FIG. 17 is a graph showing the impedance characteristics of the atomizing member when the ratio (L / r) of the length (L) along the radial direction of the bridging portion to the radius (r) of the vibrating membrane is 100%. is there.
- FIG. 18 is a graph showing the relationship between the ratio (L / r) of the length (L) along the radial direction of the bridging portion to the radius (r) of the vibrating membrane and the presence or absence of spurious.
- the length (L) along the radial direction of the bridging portion 45f is equal to the radius (r) of the vibrating membrane 40 regardless of the width (W) of the bridging portion 45f. It can be seen that spurious due to unnecessary vibration does not occur when the ratio is in the range of 30% to 50%, 70% to 90%, or 115% to 120%. From the above results, the length (L) along the radial direction of the bridging portion 45f is in the range of 30% to 50%, 70% to 90%, or 115% to 120% of the radius (r) of the vibrating membrane 40. It turns out that generation
- FIG. 19 is a schematic plan view of an atomizing member in a fourth modification.
- FIG. 20 is a schematic cross-sectional view of a part of an atomizer in a fourth modification.
- This modification is a modification of the third embodiment.
- the difference between the atomizer of the present modification and the atomizer 1b of the third embodiment is the configuration of the vibrating membrane 40 and the bridging portion 45f.
- notches 45 h that reach the center in the thickness direction of the piezoelectric body 32 are formed on both side portions in the circumferential direction of the portion where the bridging portion 45 f of the vibration film 40 is connected. .
- a portion 45f1 located between the notches 45h in the circumferential direction of the bridging portion 45f is not connected to the piezoelectric body 32.
- a central portion in the thickness direction of the piezoelectric body 32 becomes a node. For this reason, in this modification, the vibration film 40 can be supported at the node. Therefore, better atomization characteristics can be obtained.
- the piezoelectric body 32 is connected to the lower side of the vibration film 40 in the vertical direction. For this reason, the vibration film 40 is positioned below the outer edge portion 45g due to its own weight. Therefore, the portion 45f1 located between the notches 45h in the circumferential direction of the bridging portion 45f and the piezoelectric body 32 are separated from each other. Therefore, the contact between the portion 45f1 and the piezoelectric body 32 is suppressed. Therefore, wear of the portion 45f1 can be suppressed. As a result, in this modification, the lifetime of the atomizer can be extended.
- the vibrating membrane 40 and the outer edge portion 45g may be flush with each other.
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Abstract
Description
図1は、本実施形態の霧化器の略図的分解斜視図である。図2は、本実施形態の霧化器の略図的断面図である。図1及び図2に示すように、霧化器1は、霧化部材30と、霧化器本体10と、液体供給部20とを備えている。霧化器1は、例えば、霧化部材30を駆動させる回路をさらに備えていてもよい。霧化部材30を駆動させる回路は、例えば、発振回路、発振回路の制御回路、各回路へ電力を供給する電源回路などを有する。
但し、本発明において、振動膜への液体供給部は、毛細管現象を発現するものに限定されない。液体供給部20は、例えば図12,13に示すように、ポンプ20d、送風機20e等の給液手段と、給液手段からの液体を振動膜40に供給するための管20cとにより構成されていてもよい。この場合、管20cの端部と振動膜40との間の距離は、振動膜40が振動したときに管20cの端部と振動膜40とが干渉しない程度であることが好ましく、管20cの端部から液体の表面張力による最大隆起点までの距離以下であることがより好ましい。
図6は、本実施形態の霧化器の略図的断面図である。図7は、本実施形態の霧化部材の略図的断面図である。
上記第2の実施形態では、フランジ部45が円環状である例について説明した。但し、本発明において、フランジ部の形状は特に限定されない。例えば、図8に示すように、フランジ部45を略矩形状に形成してもよい。
図14は、第3の実施形態の霧化器の略図的分解斜視図である。図15は、第3の実施形態の霧化器の略図的断面図である。
図19は、第4の変形例における霧化部材の略図的平面図である。図20は、第4の変形例における霧化器の一部分の略図的断面図である。
10…霧化器本体
10a…開口
11…貯留部
12…液体
13…ギャップ
15…弾性膜
15a…内側部分
15b…外側部分
16…開口
17…開口
18…架橋部
20…液体供給部
20a…第1の液体供給部
20b…第2の液体供給部
20c…管
20d…ポンプ
20e…送風機
30…霧化部材
31…圧電振動子
32…圧電体
32a…開口部
32b…端面
33…第1の電極
34…第2の電極
40…振動膜
41…膜本体
41a…開口
42…貫通孔被形成部材
42a…貫通孔被形成部材の下面
42b…貫通孔被形成部材の上面
43…貫通孔
43a…ザグリ穴部
43b…接続部
43c…拡径部
45…フランジ部
45a…環状溝
45b…接続部
45c…フランジ部の下面
45d…フランジ部の上面
45e…貫通孔
45f…架橋部
45g…外縁部
45h…切欠き部
45h1…架橋部45fの周方向において切欠き部45hの間に位置する部分
46…第1の配線
47…第2の配線
48…第1の電極パッド
49…第2の電極パッド
Claims (15)
- 円筒状の圧電体と、前記圧電体の内周面に形成されている第1の電極と、前記圧電体の外周面に形成されている第2の電極とを有し、円筒呼吸振動する圧電振動子と、
前記圧電体の軸方向における一端側の開口部に、前記開口部を覆うように設けられており、中央部に貫通孔が形成されている振動膜とを備える、霧化部材。 - 前記圧電体と前記振動膜とは、一体に形成されている、請求項1に記載の霧化部材。
- 前記圧電振動子は、前記圧電体の軸方向における一端側の部分に接続されており、当該一端側の部分から径方向外側に向かって延びるフランジ部を有する、請求項1または2に記載の霧化部材。
- 前記フランジ部は、前記圧電体と一体に形成されている、請求項3に記載の霧化部材。
- 前記フランジ部の前記圧電体との接続部は、前記フランジ部の他の部分と振動伝搬特性が異なる、請求項3または4に記載の霧化部材。
- 前記フランジ部の前記圧電体との接続部に、溝が形成されている、請求項3~5のいずれか一項に記載の霧化部材。
- 前記圧電振動子は、前記第1の電極に接続されている第1の電極パッドと、前記第2の電極に接続されている第2の電極パッドとをさらに有し、前記第1及び第2の電極パッドは、前記フランジ部の、前記圧電体の軸方向における他端側の表面に形成されている、請求項3~6のいずれか一項に記載の霧化部材。
- 前記振動膜の前記貫通孔が形成されている中央部は、前記振動膜のその他の部分とは別体の貫通孔被形成部材により構成されている、請求項1~7のいずれか一項に記載の霧化部材。
- 前記貫通孔被形成部材は、金属製である、請求項8に記載の霧化部材。
- 前記貫通孔被形成部材は、前記振動膜の前記貫通孔被形成部材以外の部分と同一の材料により形成されている、請求項8または9に記載の霧化部材。
- 請求項1~10のいずれか一項に記載の霧化部材と、
前記圧電振動子が取り付けられており、かつ液体が貯留される貯留部が形成されている霧化器本体と、
前記貯留部に貯留されている液体を前記振動膜の前記貫通孔が形成されている部分に前記液体を供給する液体供給部とを備える、霧化器。 - 前記液体供給部は、前記振動膜に対して、前記圧電体の軸方向における前記他端側から前記液体を供給する、請求項11に記載の霧化器。
- 前記圧電振動子は、前記圧電体の軸方向における一端側の部分に接続されており、当該一端側の部分から径方向外側に向かって延び、径方向における外縁部が霧化器本体により支持されているフランジ部を有し、
前記フランジ部には、周方向に沿って延びる複数の貫通孔が形成されることにより、前記外縁部と振動膜とを接続している少なくとも2つの架橋部が形成されており、
前記少なくとも2つの架橋部のそれぞれの半径方向に沿った長さは、前記振動膜の半径の、30%~50%、70%~90%または115%~120%の範囲内にある、請求項11または12に記載の霧化器。 - 前記振動膜の前記架橋部が接続されている部分の周方向における両側部分には、前記圧電体の厚み方向における中央部にまで至る切欠き部が形成されており、
前記架橋部の周方向において前記切欠き部の間に位置する部分は、前記圧電体に接続されていない、請求項13に記載の霧化器。 - 前記圧電体は、鉛直方向において、前記振動膜の下側に配置されている、請求項14に記載の霧化器。
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JP2010549465A JP5382004B2 (ja) | 2009-02-09 | 2010-02-02 | 霧化部材及びそれを備える霧化器 |
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US20110284656A1 (en) | 2011-11-24 |
JP5382004B2 (ja) | 2014-01-08 |
WO2010089822A1 (ja) | 2010-08-12 |
CN102307674B (zh) | 2014-08-27 |
CN102307674A (zh) | 2012-01-04 |
US8540169B2 (en) | 2013-09-24 |
JPWO2010090169A1 (ja) | 2012-08-09 |
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