WO2023228588A1 - Bubble generation device and bubble generation system - Google Patents

Bubble generation device and bubble generation system Download PDF

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Publication number
WO2023228588A1
WO2023228588A1 PCT/JP2023/013899 JP2023013899W WO2023228588A1 WO 2023228588 A1 WO2023228588 A1 WO 2023228588A1 JP 2023013899 W JP2023013899 W JP 2023013899W WO 2023228588 A1 WO2023228588 A1 WO 2023228588A1
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WIPO (PCT)
Prior art keywords
cylindrical body
bubble
piezoelectric element
diaphragm
liquid
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PCT/JP2023/013899
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French (fr)
Japanese (ja)
Inventor
興▲イ▼ 寧
克己 藤本
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株式会社村田製作所
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Publication of WO2023228588A1 publication Critical patent/WO2023228588A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/451—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by means for moving the materials to be mixed or the mixture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
    • B01F31/85—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations with a vibrating element inside the receptacle

Definitions

  • the present disclosure relates to a bubble generation device and a bubble generation system.
  • Patent Document 1 Japanese Patent Laid-Open No. 2016-209825
  • the bubble generator described in Patent Document 1 uses a piezoelectric element to generate fine bubbles.
  • the central part of the diaphragm is vibrated vertically by bending vibration, and the bubbles generated in the pores formed in the diaphragm are torn off by the vibration and made into fine particles.
  • the bubbles generated in the pores may be generated due to reasons such as high specific gravity of the liquid, high surface tension of the liquid, high viscosity of the liquid, etc. There were cases in which it was not possible to generate fine bubbles by tearing them off due to the vibration of the diaphragm.
  • An object of the present disclosure is to provide a bubble generation device and a bubble generation system that effectively generate fine bubbles regardless of the type of liquid put into a liquid tank.
  • a bubble generator is a bubble generator that generates fine bubbles in a liquid, and has a plurality of openings, one surface of which is in contact with the liquid, and the other surface of which is in contact with gas.
  • a diaphragm provided at a position in contact with the diaphragm, a first cylindrical body supporting the diaphragm by one end, a plate-shaped spring part supporting the other end of the first cylindrical body by a first surface, and a spring part.
  • a second cylindrical body provided so as to enclose the first cylindrical body from the end of the first surface thereof, and a cylindrical weight provided on the outer periphery of the end of the second cylindrical body on the opposite side to the spring part. and a piezoelectric element that is arranged on a second surface of the spring section opposite to the first surface and vibrates the spring section.
  • a bubble generation system includes the above-described bubble generation device, a disk member connected to the bubble generation device at the outer end of the spring part, and a state in which the bubble generation device is housed inside. and a casing fixed to the disc member.
  • the bubble generating device in the bubble generating device, it is possible to effectively generate fine bubbles regardless of the type of liquid put into the liquid tank.
  • FIG. 1 is a schematic diagram of a bubble generation system in which the bubble generation device according to Embodiment 1 is used.
  • 1 is a schematic diagram showing the structure of a bubble generator according to Embodiment 1.
  • FIG. FIG. 2 is a schematic diagram showing the structure of a bubble generator according to a comparative example.
  • FIG. 3 is a perspective view of a bubble generator according to a comparative example.
  • FIG. 3 is a diagram for explaining displacement of the bubble generator according to the first embodiment.
  • FIG. 2 is a schematic diagram of a bubble generation system in which a bubble generation device according to a second embodiment is used.
  • FIG. 1 is a schematic diagram of a bubble generation system 100 in which a bubble generation device 1 according to Embodiment 1 is used.
  • the bubble generator 1 shown in FIG. 1 is installed at the bottom of a liquid tank 10 serving as a housing for storing a liquid such as water, gasoline, or light oil, and generates fine bubbles 200 in the liquid in the liquid tank 10. It is used in the generation system 100.
  • the bubble generation system 100 can be applied to various systems such as, for example, a water purification device, a wastewater treatment device, a fish culture tank, and a fuel injection device.
  • the liquid introduced into the liquid tank 10 differs depending on the system to which it is applied; if it is a water purification device, it will be water, but if it is a fuel injection device, it will be liquid fuel.
  • the liquid tank 10 only needs to be able to temporarily store the liquid, and includes a pipe into which the liquid is introduced, in which the liquid always flows.
  • the bubble generator 1 includes a diaphragm 2, a vibrating body 3, and a piezoelectric element 4.
  • the bubble generator 1 is provided at the bottom of the liquid tank 10 and is coupled to the liquid tank 10 via a disk member 11.
  • the bubble generator 1 is immersed above the disk member 11 in the liquid.
  • fine bubbles 200 are generated from a plurality of pores (openings) formed in the diaphragm 2.
  • the diaphragm 2 is formed of, for example, a resin plate, a metal plate, a Si or SOI (Silicon On Insulator) substrate, a porous ceramic plate, a glass plate, or the like.
  • the diaphragm 2 may be formed of a glass plate that transmits ultraviolet light and deep ultraviolet light having a wavelength of 200 nm to 380 nm, for example.
  • a light source that emits ultraviolet light to the liquid in the liquid tank 10 from the other side of the diaphragm 2 is provided, and sterilization by ozone generation and ultraviolet light irradiation are performed. can also be used for sterilization.
  • the diaphragm 2 has a plurality of pores formed therein, and one surface is in contact with the liquid (eg, water) in the liquid tank 10, and the other surface is in contact with the gas (eg, air).
  • the diaphragm 2 separates the liquid from the air, and by applying back pressure to the other side (in the direction of the arrow shown in Figure 1), the gas passes through the plurality of pores into the liquid. into the liquid in tank 10.
  • the bubble generator 1 generates fine bubbles 200 by tearing off gas sent through a plurality of pores by vibration of the diaphragm 2.
  • the surface tension of the liquid prevents the gas from entering the liquid side, while the buoyancy of the gas acts to break the surface tension. Become.
  • This balance determines the diameter of the bubble 200, and the vibration of the diaphragm 2 causes a peeling effect from the wall of the pore, creating a state as if the surface tension had decreased.
  • the vibration of the diaphragm 2 causes the gas to be torn off, resulting in fine particles with a diameter of about 1/10 compared to when the diaphragm 2 is not vibrated. bubbles 200 can be generated.
  • a plurality of pores are formed in a 5 mm x 5 mm area provided in the center of the diaphragm 2 with a diameter of 14 mm.
  • the diameter of the pores is 1 ⁇ m and the interval between the pores is 0.25 mm, 441 pores can be formed in an area of 5 mm ⁇ 5 mm.
  • the piezoelectric element 4 is electrically connected to the controller 20 by wiring. By supplying power from the controller 20 to the piezoelectric element 4, the piezoelectric element 4 vibrates a part of the vibrating body 3 in the vertical direction in the figure.
  • a diaphragm 2 is vibrated by a piezoelectric element 4 via a vibrating body 3. Specifically, when the piezoelectric element 4 vibrates, the vibration transmitted through the vibrating body 3 is transmitted to the diaphragm 2, thereby displacing the diaphragm 2 substantially uniformly in the vertical direction.
  • FIG. 2 is a schematic diagram showing the structure of the bubble generator 1 according to the first embodiment.
  • the vibrating body 3 includes a first cylindrical body 31 , a spring portion 32 , a second cylindrical body 33 , and a weight portion 34 .
  • the vibrating body 3 may have a structure in which the first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 are integrally formed, or may have a structure in which they are formed separately and combined.
  • the end of the diaphragm 2 is held by a first cylindrical body 31 that expands to support the diaphragm 2 at the top.
  • the diaphragm 2 is supported by the first cylindrical body 31 at a position where the penetrating direction of the plurality of pores formed in the diaphragm 2 is parallel to the vibration direction of the first cylindrical body 31.
  • the first cylindrical body 31 has an end opposite to the diaphragm 2 supported by a spring portion 32 .
  • the spring portion 32 is an elastically deformable plate-like member that supports the bottom surface, which is the end of the cylindrical first cylindrical body 31, on the upper first surface, and moves inward and outward from the supported position. It is stretched.
  • the spring portion 32 has a hollow circular shape and is connected to the first cylindrical body 31 at a position outside the hollow portion. Note that the inner diameter of the first cylindrical body 31 and the inner diameter of the spring portion 32 may be made the same.
  • the second cylindrical body 33 has a cylindrical shape and is provided above the spring part 32 so as to enclose the first cylindrical body 31 from the end of the first surface of the spring part 32.
  • the weight portion 34 has a cylindrical shape and is provided on the outer periphery of the end of the second cylindrical body 33. Note that when the piezoelectric element 4 is driven, the center of the upper end of the weight part 34 on the side opposite to the side where the spring part 32 is provided is a vibration node (not displaced even by the vibration of the piezoelectric element 4). the shape and position of the part). Further, the weight portion 34 has a shape and a position that allows the diaphragm 2 to vibrate vertically in parallel when the piezoelectric element 4 is driven.
  • the shape, position, and mass of the weight portion 34 may be determined by performing a simulation including other configurations of the bubble generator 1 so as to satisfy the above contents.
  • the outer end of the spring portion 32 also serves as a vibration node.
  • the weight portion 34 may not be provided as long as the position where the liquid tank 10 is connected is a vibration node.
  • the bubble generator 1 does not need to have the weight part 34 as long as the vibration plate 2 can be driven to vibrate vertically in parallel.
  • a piezoelectric element 4 is provided on the lower second surface of the spring portion 32 on the inner side of the position where the second cylindrical body 33 is provided.
  • the piezoelectric element 4 has a hollow circular shape matching the shape of the spring section 32, and is provided on the entire surface of the spring section 32.
  • the piezoelectric element 4 vibrates in the penetrating direction of the first cylindrical body 31 (vertical direction in the figure).
  • the piezoelectric element 4 vibrates in the penetrating direction of the first cylindrical body 31, thereby causing the spring portion 32 to vibrate in the penetrating direction of the first cylindrical body 31, thereby displacing the first cylindrical body 31 substantially uniformly in the vertical direction. do.
  • the piezoelectric element 4 may be provided extending to the outer end of the spring portion 32. Further, the piezoelectric element 4 may be arranged not on the entire surface of the spring portion 32, but in such a manner that a plurality of piezoelectric elements 4 are arranged at intervals.
  • the first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 are integrally formed.
  • the first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 are made of metal such as stainless steel or synthetic resin, for example. Preferably, a highly rigid metal such as stainless steel is desirable.
  • the first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 may be formed as separate bodies or may be formed as separate members.
  • the method of joining the diaphragm 2 and the first cylindrical body 31 is not particularly limited. The diaphragm 2 and the first cylindrical body 31 may be joined by adhesive, welding, fitting, press-fitting, or the like.
  • the bubble generator 1 is engaged with the liquid tank 10 via the disk member 11 at the outer end of the spring portion 32.
  • the outer end of the spring portion 32 or the upper end of the weight portion 34 does not vibrate substantially even when the diaphragm 2 is vibrated by the piezoelectric element 4. Therefore, it is possible to substantially vibrate only the diaphragm 2 without transmitting the vibration of the piezoelectric element 4 to the liquid tank 10.
  • the piezoelectric element 4 vibrates by being polarized in the thickness direction.
  • the piezoelectric element 4 is made of lead zirconate titanate piezoelectric ceramics.
  • other piezoelectric ceramics such as (K,Na)NbO3 may also be used.
  • a piezoelectric single crystal such as LiTaO3 may be used.
  • the structure of the diaphragm 2 in contact with the liquid is, for example, a glass plate, and the diaphragm 2 is vibrated by a piezoelectric element 4 via a vibrating body 3, so that the space into which gas is introduced and the liquid are separated. can be completely separated.
  • the space into which gas is introduced from the liquid it is possible to prevent the electrical wiring of the piezoelectric element 4 from being immersed in the liquid.
  • the light source can be provided in the space where gas is introduced, so that the electrical wiring etc. of the light source can be connected to the liquid. It can also prevent you from getting soaked.
  • FIG. 3 is a schematic diagram showing the structure of a bubble generator 1A according to a comparative example.
  • FIG. 4 is a perspective view of a bubble generator 1A according to a comparative example.
  • the shape of the vibrating body 3A is different from the shape of the vibrating body 3 of the first embodiment.
  • a second cylindrical body 33A is provided below the end of the spring portion 32 in the vibrating body 3A.
  • the weight portion 34 has a cylindrical shape and is provided on the lower outer periphery of the second cylindrical body 33.
  • the weight part 34A has a shape and position such that when the piezoelectric element 4 is driven, the position where the spring part 32 and the second cylindrical body 33A are connected becomes a vibration node, and the weight part 34A The shape and position enable the diaphragm 2 to vibrate vertically in parallel when driven.
  • the second cylindrical body 33 of the vibrating body 3 has a cylinder extending upward from the spring portion 32 .
  • the second cylindrical body 33A of the vibrating body 3 has a cylinder extending downward from the spring portion 32.
  • the second surface which is the lower surface of the spring portion 32
  • unevenness may occur due to variations during manufacturing. If the second surface of the spring section 32 has irregularities, the larger the irregularities, the smaller the contact area between the piezoelectric element 4 and the second surface of the spring section 32 when the piezoelectric element 4 is attached. This makes it difficult for the vibrations of the piezoelectric element 4 to be transmitted to the spring portion 32, so that the vibrations are also difficult to be transmitted to the first cylindrical body 31, to which the vibrations are transmitted. Therefore, there is a possibility that the vibration of the diaphragm 2 becomes weaker than expected.
  • the surface to which the piezoelectric element 4 is attached by the second cylindrical body 33A and the weight part 34A is located inside the end of the weight part 34A, so even if unevenness occurs Polishing the second surface of the spring portion 32 is difficult.
  • the lower second surface of the spring portion 32 where the piezoelectric element 4 is provided is exposed to the outermost side of the vibrating body 3, so the bubble generating device 1A of the comparative example It is easier to polish than. Thereby, flatness can be ensured on the surface to which the piezoelectric element 4 is attached, and the diaphragm 2 can be strongly vibrated.
  • the second cylindrical body 33 in the vibrating body 3 has a cylinder extending upward from the spring portion 32, so that the bubble generator 1 of the first embodiment has a lower overall height than the bubble generator 1A of the comparative example. By making it lower, it can be made smaller.
  • FIG. 5 is a diagram for explaining the displacement of the bubble generator 1 according to the first embodiment.
  • an end view of the bubble generator 1 shows the displacement as a result of simulating the vibration of the diaphragm 2.
  • the reference position of the bubble generator 1 before starting vibration is shown by a broken line
  • the position of the bubble generator 1 after displacement is shown by a solid line.
  • the spring portion 32 When the piezoelectric element 4 is vibrated in the penetrating direction of the first cylindrical body 31 based on a drive signal from the controller 20 (see FIG. 1), the spring portion 32 is displaced downward as shown in FIG. 5, for example. As the position of the spring portion 32 supporting the first cylindrical body 31 sinks downward, the entire first cylindrical body 31 is displaced downward, and as a result, the first cylindrical body 31 is held by the first cylindrical body 31. The entirety of the diaphragm 2 is displaced downward. At this time, the node is formed at the outer end of the spring portion 32. Therefore, by connecting the outer end of the spring portion 32 to the liquid tank 10 via the disc member 11, the bubble generator 1 vibrates without substantially transmitting the vibration of the piezoelectric element 4 to the liquid tank 10. The plate 2 can be vibrated. Note that, as shown in FIG. 5, the vicinity of the center of the upper end of the weight portion 34 also serves as a node.
  • the spring portion 32 is displaced downward, and then the spring portion 32 is displaced upward.
  • the entire first cylindrical body 31 is displaced upward, and as a result, it is held by the first cylindrical body 31.
  • the entire diaphragm 2 is displaced upward.
  • the entire diaphragm 2 is substantially uniformly displaced in the vertical direction without substantially deforming the diaphragm 2 itself. . Therefore, in the bubble generator 1, by driving the diaphragm 2 in a planar manner using the vertical resonance of the spring portion 32, an acceleration that causes tearing of the diaphragm 2 is generated at any position of the diaphragm 2, and the vibration plate 2 is The gas fed through the plurality of pores is torn off by the shear stress to generate uniform bubbles. Thereby, fine bubbles can be effectively generated regardless of the type of liquid to be put into the liquid tank 10.
  • FIG. 6 is a schematic diagram of a bubble generation system 100B in which a bubble generation device 1B according to the second embodiment is used.
  • the bubble generation system 100B includes a hanging section 35 for hanging the bubble generation device 1B at the upper end of the weight section 34.
  • the hanging portion 35 is included in and integrally formed with the vibrating body 3B.
  • the hanging portion 35 may be a separate member.
  • the bubble generator 1 ⁇ /b>B is fixed by a fixing member 13 with a hanging part 35 suspended from a flange part 12 that projects inward from the liquid tank 10 .
  • the liquid tank 10 is fixed to the hanging part 35 with the bubble generator 1B accommodated therein.
  • the vicinity of the center of the upper end of the weight portion 34 also serves as a node.
  • the position of the hanging portion 35 in FIG. 6 becomes a node. Therefore, the bubble generator 1B can vibrate the diaphragm 2 without substantially transmitting the vibration of the piezoelectric element 4 to the liquid tank 10 by coupling the end of the weight portion 34 to the liquid tank 10.
  • the bubble generation system 100B is configured such that the inside of the second cylindrical body 33 is filled with liquid and the outside of the second cylindrical body 33 is in contact with gas. It can be said that the bubble generation system 100B is configured such that the inside of the weight part 34 is filled with liquid and the outside of the weight part 34 is in contact with gas. In this way, it is possible to suppress vibration damping due to the outside of the second cylindrical body 33 and the weight portion 34 being filled with liquid.
  • the side surface of the second cylindrical body 33 may serve as a node.
  • the liquid tank 10 and the second cylindrical body 33 may be joined by the disk member 11.
  • the bubble generator of the present disclosure is a bubble generator that generates fine bubbles in a liquid, in which a plurality of openings are formed, one surface is in contact with the liquid, and the other surface is in contact with gas.
  • a diaphragm provided at a position, a first cylindrical body supporting the diaphragm by one end, a plate-shaped spring part supporting the other end of the first cylindrical body by a first surface, and a spring part.
  • a second cylindrical body provided to enclose the first cylindrical body from the end of the first surface; and a cylindrical weight part provided on the outer periphery of the end of the second cylindrical body on the opposite side to the spring part. and a piezoelectric element disposed on a second surface of the spring portion opposite to the first surface and vibrating the spring portion.
  • fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
  • the piezoelectric element is provided on the second surface inside a position where the second cylindrical body is provided. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
  • the piezoelectric element is provided on the entire surface of the second surface inside the position where the second cylindrical body is provided. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
  • the bubble generation system of the present disclosure includes the bubble generation device according to any one of (1) to (6), a disc member connected to the bubble generation device at the outer end of the spring part, and It includes a casing that is fixed to the disc member with the generator housed therein. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
  • the bubble generation system of the present disclosure includes the bubble generation device according to any one of (1) to (6), a hanging portion that hangs the bubble generation device at the end of the weight portion, and the bubble generation device.
  • the housing includes a housing that is fixed to the hanging part while housed inside. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

This bubble generation device (1) generates fine bubbles in a liquid. The bubble generation device (1) comprises: a diaphragm (2) in which a plurality of openings are formed, the diaphragm (2) being provided at a position at which one surface thereof is in contact with a liquid and the other surface is in contact with air; a first cylindrical body (31) that supports the diaphragm (2) from one end; a plate-form spring part (32) that supports the other end of the first cylindrical body (31) at a first surface; a second cylindrical body (33) provided so as to surround the first cylindrical body (31) from the end section of the first surface of the spring part (32); a cylindrical weight part (34) provided to the outer periphery of the end section of the second cylindrical body (33) on the side opposite from the spring part (32); and a piezoelectric element (4) that is disposed on a second surface located on the opposite side of the spring part (32) from the first surface and that causes the spring part (32) to vibrate.

Description

気泡発生装置、および気泡発生システムAir bubble generator and air bubble generation system
　本開示は、気泡発生装置、および気泡発生システムに関する。 The present disclosure relates to a bubble generation device and a bubble generation system.
　近年、微細な気泡を使って水質浄化、排水処理、魚の養殖などが行なわれており、微細な気泡が様々な分野において利用されている。そのため、微細な気泡を発生する気泡発生装置が開発されている（特開２０１６－２０９８２５号公報（特許文献１））。 In recent years, microscopic air bubbles have been used for water purification, wastewater treatment, fish farming, etc., and microscopic air bubbles are being used in a variety of fields. Therefore, a bubble generator that generates fine bubbles has been developed (Japanese Patent Laid-Open No. 2016-209825 (Patent Document 1)).
　特許文献１に記載の気泡発生装置では、圧電素子を利用して微細な気泡を発生させている。この気泡発生装置では、屈曲振動により振動板の中央部を上下振動させて、振動板に形成した細孔において発生した気泡を振動により引きちぎり微細化している。 The bubble generator described in Patent Document 1 uses a piezoelectric element to generate fine bubbles. In this bubble generating device, the central part of the diaphragm is vibrated vertically by bending vibration, and the bubbles generated in the pores formed in the diaphragm are torn off by the vibration and made into fine particles.
特開２０１６－２０９８２５号公報JP2016-209825A
　特許文献１に記載の気泡発生装置では、液体槽に入れる液体の種類によって、液体の比重が大きい、液体の表面張力が大きい、液体の粘性が高いなどの原因により、細孔において発生した気泡を振動板の振動により引きちぎって微細な気泡を発生させることができない場合があった。 In the bubble generator described in Patent Document 1, depending on the type of liquid to be put into the liquid tank, the bubbles generated in the pores may be generated due to reasons such as high specific gravity of the liquid, high surface tension of the liquid, high viscosity of the liquid, etc. There were cases in which it was not possible to generate fine bubbles by tearing them off due to the vibration of the diaphragm.
　様々な種類の液体に対して気泡発生装置で微細な気泡を発生させるためには、振動板を圧電素子でより強く振動させる必要がある。しかし、圧電素子により振動板をより強く振動させると、振動板の振動が液体槽に漏れ、液体槽自体を振動させる問題があった。 In order to generate fine bubbles in various types of liquids with a bubble generator, it is necessary to vibrate the diaphragm more strongly with a piezoelectric element. However, when the piezoelectric element vibrates the diaphragm more strongly, the vibration of the diaphragm leaks into the liquid tank, causing the liquid tank itself to vibrate.
　本開示の目的は、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させる気泡発生装置、および気泡発生システムを提供することである。 An object of the present disclosure is to provide a bubble generation device and a bubble generation system that effectively generate fine bubbles regardless of the type of liquid put into a liquid tank.
　本開示の一形態に係る気泡発生装置は、液体中に微細な気泡を発生させる気泡発生装置であって、複数の開口部が形成され、一方の面が液体と接し、他方の面が気体と接する位置に設けられる振動板と、一方の端により振動板を支持する第１筒状体と、第１筒状体の他方の端を第１面で支持する板状のバネ部と、バネ部の第１面の端部から第１筒状体を内包するように設けられる第２筒状体と、バネ部と反対側における第２筒状体の端部の外周に設けられる円筒状の錘部と、バネ部において第１面と反対側の第２面に配置され、バネ部を振動させる圧電素子と、を備える。 A bubble generator according to an embodiment of the present disclosure is a bubble generator that generates fine bubbles in a liquid, and has a plurality of openings, one surface of which is in contact with the liquid, and the other surface of which is in contact with gas. A diaphragm provided at a position in contact with the diaphragm, a first cylindrical body supporting the diaphragm by one end, a plate-shaped spring part supporting the other end of the first cylindrical body by a first surface, and a spring part. a second cylindrical body provided so as to enclose the first cylindrical body from the end of the first surface thereof, and a cylindrical weight provided on the outer periphery of the end of the second cylindrical body on the opposite side to the spring part. and a piezoelectric element that is arranged on a second surface of the spring section opposite to the first surface and vibrates the spring section.
　本開示の別の一形態に係る気泡発生システムは、前述の気泡発生装置と、バネ部の外側の端部において気泡発生装置と接続される円板部材と、気泡発生装置を内部に収容した状態で円板部材と固定される筐体と、を備える。 A bubble generation system according to another embodiment of the present disclosure includes the above-described bubble generation device, a disk member connected to the bubble generation device at the outer end of the spring part, and a state in which the bubble generation device is housed inside. and a casing fixed to the disc member.
　本開示によれば、気泡発生装置において、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることが可能である。 According to the present disclosure, in the bubble generating device, it is possible to effectively generate fine bubbles regardless of the type of liquid put into the liquid tank.
実施の形態１に係る気泡発生装置が用いられる気泡発生システムの概略図である。1 is a schematic diagram of a bubble generation system in which the bubble generation device according to Embodiment 1 is used. 実施の形態１に係る気泡発生装置の構造を示す概略図である。1 is a schematic diagram showing the structure of a bubble generator according to Embodiment 1. FIG. 比較例に係る気泡発生装置の構造を示す概略図である。FIG. 2 is a schematic diagram showing the structure of a bubble generator according to a comparative example. 比較例に係る気泡発生装置の斜視図である。FIG. 3 is a perspective view of a bubble generator according to a comparative example. 実施の形態１に係る気泡発生装置の変位を説明するための図である。FIG. 3 is a diagram for explaining displacement of the bubble generator according to the first embodiment. 実施の形態２に係る気泡発生装置が用いられる気泡発生システムの概略図である。FIG. 2 is a schematic diagram of a bubble generation system in which a bubble generation device according to a second embodiment is used.
　以下に、実施の形態に係る気泡発生装置、および気泡発生システムについて、図面を参照しながら詳細に説明する。なお、図中の同一または相当部分については、同一符号を付してその説明は繰り返さない。 Below, a bubble generation device and a bubble generation system according to an embodiment will be described in detail with reference to the drawings. Note that the same or corresponding parts in the figures are designated by the same reference numerals, and the description thereof will not be repeated.
　（実施の形態１）
　図１は、実施の形態１に係る気泡発生装置１が用いられる気泡発生システム１００の概略図である。図１に示す気泡発生装置１は、例えば、水，ガソリン，軽油などの液体を貯留する筐体としての液体槽１０の底部に設けられ、液体槽１０の液体に微細な気泡２００を発生させる気泡発生システム１００に用いられる。なお、気泡発生システム１００は、例えば、水質浄化装置、排水処理装置、魚の養殖用水槽、燃料噴射装置などの様々なシステムに適用することができる。 (Embodiment 1)
FIG. 1 is a schematic diagram of a bubble generation system 100 in which a bubble generation device 1 according to Embodiment 1 is used. The bubble generator 1 shown in FIG. 1 is installed at the bottom of a liquid tank 10 serving as a housing for storing a liquid such as water, gasoline, or light oil, and generates fine bubbles 200 in the liquid in the liquid tank 10. It is used in the generation system 100. Note that the bubble generation system 100 can be applied to various systems such as, for example, a water purification device, a wastewater treatment device, a fish culture tank, and a fuel injection device.
　液体槽１０は、適用するシステムにより導入される液体が異なり、水質浄化装置であれば水になるが、燃料噴射装置であれば液体燃料になる。液体槽１０は、液体を一時的に貯留することができればよく、液体が導入される管において当該管の中を常に液体が流れるようなものも含む。 The liquid introduced into the liquid tank 10 differs depending on the system to which it is applied; if it is a water purification device, it will be water, but if it is a fuel injection device, it will be liquid fuel. The liquid tank 10 only needs to be able to temporarily store the liquid, and includes a pipe into which the liquid is introduced, in which the liquid always flows.
　気泡発生装置１は、振動板２と、振動体３と、圧電素子４とを備えている。気泡発生装置１は、液体槽１０の底部に設けられ、液体槽１０と円板部材１１を介して結合されている。気泡発生装置１は、円板部材１１より上側が液体に浸かっている。液体に浸かった振動板２を圧電素子４により振動させることにより、振動板２に形成した複数の細孔（開口部）から微細な気泡２００を発生させている。 The bubble generator 1 includes a diaphragm 2, a vibrating body 3, and a piezoelectric element 4. The bubble generator 1 is provided at the bottom of the liquid tank 10 and is coupled to the liquid tank 10 via a disk member 11. The bubble generator 1 is immersed above the disk member 11 in the liquid. By vibrating the diaphragm 2 immersed in liquid by the piezoelectric element 4, fine bubbles 200 are generated from a plurality of pores (openings) formed in the diaphragm 2.
　振動板２は、例えば、樹脂板、金属板、ＳｉもしくはＳＯＩ（Silicon　On　Insulator）基板、多孔質のセラミック板、ガラス板などで形成されている。振動板２をガラス板により形成する場合、例えば、波長が２００ｎｍ～３８０ｎｍの紫外光および深紫外光を透過させるガラス板により形成してもよい。紫外光および深紫外光を透過させるガラス板により形成することで、振動板２の他方の面側から液体槽１０の液体に対して紫外光を発する光源を設け、オゾン生成による殺菌と紫外光照射による殺菌とを兼用させることができる。 The diaphragm 2 is formed of, for example, a resin plate, a metal plate, a Si or SOI (Silicon On Insulator) substrate, a porous ceramic plate, a glass plate, or the like. When the diaphragm 2 is formed of a glass plate, it may be formed of a glass plate that transmits ultraviolet light and deep ultraviolet light having a wavelength of 200 nm to 380 nm, for example. By forming a glass plate that transmits ultraviolet light and deep ultraviolet light, a light source that emits ultraviolet light to the liquid in the liquid tank 10 from the other side of the diaphragm 2 is provided, and sterilization by ozone generation and ultraviolet light irradiation are performed. can also be used for sterilization.
　振動板２は、複数の細孔が形成され、一方の面が液体槽１０の液体（例えば、水）と接し、他方の面が気体（例えば、空気）と接している。つまり、気泡発生装置１では、振動板２により液体と空気とを分離し、他方の面に背圧を加え（図１に示す矢印方向）ることで、複数の細孔を通って気体が液体槽１０の液体に送り込まれる。気泡発生装置１は、複数の細孔を通って送り込まれた気体を、振動板２の振動により引きちぎることで微細な気泡２００を発生させている。 The diaphragm 2 has a plurality of pores formed therein, and one surface is in contact with the liquid (eg, water) in the liquid tank 10, and the other surface is in contact with the gas (eg, air). In other words, in the bubble generator 1, the diaphragm 2 separates the liquid from the air, and by applying back pressure to the other side (in the direction of the arrow shown in Figure 1), the gas passes through the plurality of pores into the liquid. into the liquid in tank 10. The bubble generator 1 generates fine bubbles 200 by tearing off gas sent through a plurality of pores by vibration of the diaphragm 2.
　さらに詳しく説明すると、複数の細孔から気体が出ようとする際、液体の表面張力によって液体側へ気体が侵入するのを阻害する一方、気体の浮力によりその表面張力を断ち切る力が働くことになる。このバランスにより気泡２００の径が決まることになるが、振動板２の振動により細孔の壁面からの引きはがし効果が生じ、あたかも表面張力が小さくなったかのような状態となる。その結果、複数の細孔から気体が出ようとする初期の段階で、振動板２の振動により気体が引きちぎられ、振動板２の振動を加えない場合に比べて１／１０程度の径の微細な気泡２００を発生させることができる。 To explain in more detail, when gas tries to exit from multiple pores, the surface tension of the liquid prevents the gas from entering the liquid side, while the buoyancy of the gas acts to break the surface tension. Become. This balance determines the diameter of the bubble 200, and the vibration of the diaphragm 2 causes a peeling effect from the wall of the pore, creating a state as if the surface tension had decreased. As a result, at the initial stage when gas is about to come out from the multiple pores, the vibration of the diaphragm 2 causes the gas to be torn off, resulting in fine particles with a diameter of about 1/10 compared to when the diaphragm 2 is not vibrated. bubbles 200 can be generated.
　図示していないが、例えば、直径１４ｍｍの振動板２の中央部に設けた５ｍｍ×５ｍｍの領域に複数の細孔が形成されている。細孔の孔径を１μｍ、細孔の間隔を０．２５ｍｍにした場合、５ｍｍ×５ｍｍの領域に４４１個の細孔を形成することができる。 Although not shown, for example, a plurality of pores are formed in a 5 mm x 5 mm area provided in the center of the diaphragm 2 with a diameter of 14 mm. When the diameter of the pores is 1 μm and the interval between the pores is 0.25 mm, 441 pores can be formed in an area of 5 mm×5 mm.
　圧電素子４は、コントローラ２０と配線で電気的に接続されている。コントローラ２０から圧電素子４に電力を供給することで、圧電素子４は、振動体３の一部を図中の上下方向に振動する。気泡発生装置１では、振動体３を介して圧電素子４で振動板２を振動させている。具体的には、圧電素子４が振動することにより、振動体３を伝わった振動が振動板２に伝わり、振動板２を略均一に上下方向に変位させる。 The piezoelectric element 4 is electrically connected to the controller 20 by wiring. By supplying power from the controller 20 to the piezoelectric element 4, the piezoelectric element 4 vibrates a part of the vibrating body 3 in the vertical direction in the figure. In the bubble generator 1, a diaphragm 2 is vibrated by a piezoelectric element 4 via a vibrating body 3. Specifically, when the piezoelectric element 4 vibrates, the vibration transmitted through the vibrating body 3 is transmitted to the diaphragm 2, thereby displacing the diaphragm 2 substantially uniformly in the vertical direction.
　図２は、実施の形態１に係る気泡発生装置１の構造を示す概略図である。振動体３は、第１筒状体３１、バネ部３２、第２筒状体３３、および錘部３４を含んでいる。振動体３は、第１筒状体３１、バネ部３２、第２筒状体３３、および錘部３４が一体で形成される構造でも、別々に形成されて結合される構造でもよい。 FIG. 2 is a schematic diagram showing the structure of the bubble generator 1 according to the first embodiment. The vibrating body 3 includes a first cylindrical body 31 , a spring portion 32 , a second cylindrical body 33 , and a weight portion 34 . The vibrating body 3 may have a structure in which the first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 are integrally formed, or may have a structure in which they are formed separately and combined.
　振動板２の端部は、上部において振動板２を支持するように拡がる円筒状の第１筒状体３１により保持されている。振動板２に形成された複数の細孔の貫通方向が、第１筒状体３１の振動方向に対して平行となる位置において、振動板２が第１筒状体３１に支持されている。第１筒状体３１は、振動板２側とは反対側の端部がバネ部３２に支持されている。バネ部３２は、弾性変形可能な板状の部材であり、円筒状の第１筒状体３１の端である底面を上側の第１面で支持し、支持した位置から内側および外側に向かって延伸している。バネ部３２は、中空円状であり、中空部より外側の位置において第１筒状体３１と繋がっている。なお、第１筒状体３１の内径とバネ部３２の内径とを同じにしてもよい。 The end of the diaphragm 2 is held by a first cylindrical body 31 that expands to support the diaphragm 2 at the top. The diaphragm 2 is supported by the first cylindrical body 31 at a position where the penetrating direction of the plurality of pores formed in the diaphragm 2 is parallel to the vibration direction of the first cylindrical body 31. The first cylindrical body 31 has an end opposite to the diaphragm 2 supported by a spring portion 32 . The spring portion 32 is an elastically deformable plate-like member that supports the bottom surface, which is the end of the cylindrical first cylindrical body 31, on the upper first surface, and moves inward and outward from the supported position. It is stretched. The spring portion 32 has a hollow circular shape and is connected to the first cylindrical body 31 at a position outside the hollow portion. Note that the inner diameter of the first cylindrical body 31 and the inner diameter of the spring portion 32 may be made the same.
　第２筒状体３３は、円筒状であり、バネ部３２の第１面の端部から第１筒状体３１を内包するようにバネ部３２の上側に設けられる。錘部３４は、円筒状であり第２筒状体３３の端部の外周に設けられている。なお、錘部３４は、圧電素子４を駆動させた場合に、バネ部３２が設けられる側と反対側の錘部３４の上端部の中央が振動のノード（圧電素子４の振動によっても変位しない部分）となる形状および位置である。また、錘部３４は、圧電素子４を駆動させた場合に、振動板２が平行に上下振動する駆動が可能となる形状および位置である。 The second cylindrical body 33 has a cylindrical shape and is provided above the spring part 32 so as to enclose the first cylindrical body 31 from the end of the first surface of the spring part 32. The weight portion 34 has a cylindrical shape and is provided on the outer periphery of the end of the second cylindrical body 33. Note that when the piezoelectric element 4 is driven, the center of the upper end of the weight part 34 on the side opposite to the side where the spring part 32 is provided is a vibration node (not displaced even by the vibration of the piezoelectric element 4). the shape and position of the part). Further, the weight portion 34 has a shape and a position that allows the diaphragm 2 to vibrate vertically in parallel when the piezoelectric element 4 is driven.
　錘部３４の形状、位置および質量は、気泡発生装置１の他の構成を含めてシミュレーションを行ない、上記の内容を満たすように決定すればよい。気泡発生装置１は、バネ部３２の外側の端部についても振動のノードとなっている。なお、液体槽１０と結合される位置が振動のノードとなる形状であれば、錘部３４を有していなくてもよい。もちろん、気泡発生装置１は、振動板２が平行に上下振動する駆動が可能であれば、錘部３４を有していなくてもよい。 The shape, position, and mass of the weight portion 34 may be determined by performing a simulation including other configurations of the bubble generator 1 so as to satisfy the above contents. In the bubble generator 1, the outer end of the spring portion 32 also serves as a vibration node. Note that the weight portion 34 may not be provided as long as the position where the liquid tank 10 is connected is a vibration node. Of course, the bubble generator 1 does not need to have the weight part 34 as long as the vibration plate 2 can be driven to vibrate vertically in parallel.
　バネ部３２の下側の第２面には、第２筒状体３３が設けられる位置よりも内側に圧電素子４が設けられている。圧電素子４は、バネ部３２の形状に合わせて中空円状の形状であり、バネ部３２の全面に設けられている。圧電素子４は、第１筒状体３１の貫通方向（図中、上下方向）に振動する。圧電素子４が第１筒状体３１の貫通方向に振動することにより、バネ部３２を第１筒状体３１の貫通方向に振動させて第１筒状体３１が略均一に上下方向に変位する。なお、圧電素子４は、バネ部３２の外側の端部まで延伸して設けられていてもよい。また、圧電素子４は、バネ部３２の全面ではなく、複数の圧電素子４が間隔を空けて配置されるようにしてもよい。 A piezoelectric element 4 is provided on the lower second surface of the spring portion 32 on the inner side of the position where the second cylindrical body 33 is provided. The piezoelectric element 4 has a hollow circular shape matching the shape of the spring section 32, and is provided on the entire surface of the spring section 32. The piezoelectric element 4 vibrates in the penetrating direction of the first cylindrical body 31 (vertical direction in the figure). The piezoelectric element 4 vibrates in the penetrating direction of the first cylindrical body 31, thereby causing the spring portion 32 to vibrate in the penetrating direction of the first cylindrical body 31, thereby displacing the first cylindrical body 31 substantially uniformly in the vertical direction. do. Note that the piezoelectric element 4 may be provided extending to the outer end of the spring portion 32. Further, the piezoelectric element 4 may be arranged not on the entire surface of the spring portion 32, but in such a manner that a plurality of piezoelectric elements 4 are arranged at intervals.
　第１筒状体３１、バネ部３２、第２筒状体３３、および錘部３４は、一体的に形成される。第１筒状体３１、バネ部３２、第２筒状体３３、および錘部３４は、例えば、ステンレスなどの金属や合成樹脂からなる。好ましくは、ステンレスなどの剛性の高い金属が望ましい。なお、第１筒状体３１、バネ部３２、第２筒状体３３、および錘部３４を別体として形成してもよいし、別部材として形成してもよい。振動板２と第１筒状体３１との接合方法は、特に問わない。振動板２と第１筒状体３１とを、接着剤、溶着、嵌合、圧入、などで接合してもよい。 The first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 are integrally formed. The first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 are made of metal such as stainless steel or synthetic resin, for example. Preferably, a highly rigid metal such as stainless steel is desirable. Note that the first cylindrical body 31, the spring portion 32, the second cylindrical body 33, and the weight portion 34 may be formed as separate bodies or may be formed as separate members. The method of joining the diaphragm 2 and the first cylindrical body 31 is not particularly limited. The diaphragm 2 and the first cylindrical body 31 may be joined by adhesive, welding, fitting, press-fitting, or the like.
　気泡発生装置１は、図１に示すように、バネ部３２の外側の端部において、円板部材１１を介して液体槽１０と係合している。バネ部３２の外側の端部または錘部３４の上側の端部は、圧電素子４により振動板２を振動させても、ほぼ無振動である。そのため、圧電素子４の振動を液体槽１０に伝えずに、実質的に振動板２のみを振動させることが可能である。 As shown in FIG. 1, the bubble generator 1 is engaged with the liquid tank 10 via the disk member 11 at the outer end of the spring portion 32. The outer end of the spring portion 32 or the upper end of the weight portion 34 does not vibrate substantially even when the diaphragm 2 is vibrated by the piezoelectric element 4. Therefore, it is possible to substantially vibrate only the diaphragm 2 without transmitting the vibration of the piezoelectric element 4 to the liquid tank 10.
　圧電素子４は、例えば、厚み方向において分極することで振動する。圧電素子４は、チタン酸ジルコン酸鉛系圧電セラミックスからなる。もっとも、（Ｋ，Ｎａ）ＮｂＯ３などの他の圧電セラミックスが用いられてもよい。さらにＬｉＴａＯ３などの圧電単結晶が用いられてもよい。 For example, the piezoelectric element 4 vibrates by being polarized in the thickness direction. The piezoelectric element 4 is made of lead zirconate titanate piezoelectric ceramics. However, other piezoelectric ceramics such as (K,Na)NbO3 may also be used. Furthermore, a piezoelectric single crystal such as LiTaO3 may be used.
　気泡発生装置１では、液体に接する振動板２の構造を例えばガラス板とし、振動体３を介して圧電素子４により振動板２を振動させる構成にすることで、気体を導入する空間と液体とを完全分離することができる。気体を導入する空間と液体とを完全分離することで、圧電素子４の電気配線等が液体に浸かることを防止できる。また、気泡発生装置１では、液体槽１０の液体に対して紫外光を発する光源を設ける場合でも、気体を導入する空間に当該光源を設けることができるので、当該光源の電気配線等が液体に浸かることも防止できる。 In the bubble generator 1, the structure of the diaphragm 2 in contact with the liquid is, for example, a glass plate, and the diaphragm 2 is vibrated by a piezoelectric element 4 via a vibrating body 3, so that the space into which gas is introduced and the liquid are separated. can be completely separated. By completely separating the space into which gas is introduced from the liquid, it is possible to prevent the electrical wiring of the piezoelectric element 4 from being immersed in the liquid. Furthermore, in the bubble generator 1, even when a light source that emits ultraviolet light to the liquid in the liquid tank 10 is provided, the light source can be provided in the space where gas is introduced, so that the electrical wiring etc. of the light source can be connected to the liquid. It can also prevent you from getting soaked.
　次に、比較例について説明する。図３は、比較例に係る気泡発生装置１Ａの構造を示す概略図である。図４は、比較例に係る気泡発生装置１Ａの斜視図である。比較例においては、振動体３Ａの形状が実施の形態１の振動体３の形状と異なっている。 Next, a comparative example will be explained. FIG. 3 is a schematic diagram showing the structure of a bubble generator 1A according to a comparative example. FIG. 4 is a perspective view of a bubble generator 1A according to a comparative example. In the comparative example, the shape of the vibrating body 3A is different from the shape of the vibrating body 3 of the first embodiment.
　図３，図４に示すように比較例の気泡発生装置１Ａは、振動体３Ａにおいてバネ部３２の端部から下側に第２筒状体３３Ａが設けられている。錘部３４は、円筒状であり、第２筒状体３３の下側の外周に設けられている。比較例において、錘部３４Ａは、圧電素子４を駆動させた場合に、バネ部３２と第２筒状体３３Ａとが繋がる位置が振動のノードとなる形状および位置であるとともに、圧電素子４を駆動させた場合に、振動板２が平行に上下振動する駆動が可能となる形状および位置である。 As shown in FIGS. 3 and 4, in the bubble generator 1A of the comparative example, a second cylindrical body 33A is provided below the end of the spring portion 32 in the vibrating body 3A. The weight portion 34 has a cylindrical shape and is provided on the lower outer periphery of the second cylindrical body 33. In the comparative example, the weight part 34A has a shape and position such that when the piezoelectric element 4 is driven, the position where the spring part 32 and the second cylindrical body 33A are connected becomes a vibration node, and the weight part 34A The shape and position enable the diaphragm 2 to vibrate vertically in parallel when driven.
　ここで、圧電素子４をバネ部３２に貼付する場合について説明する。実施の形態１の気泡発生装置１は、振動体３において第２筒状体３３がバネ部３２から上側に円筒が延伸されている。それに対し、比較例の気泡発生装置１Ａは、振動体３において第２筒状体３３Ａがバネ部３２から下側に円筒が延伸されている。 Here, a case in which the piezoelectric element 4 is attached to the spring portion 32 will be described. In the bubble generating device 1 of the first embodiment, the second cylindrical body 33 of the vibrating body 3 has a cylinder extending upward from the spring portion 32 . On the other hand, in the bubble generating device 1A of the comparative example, the second cylindrical body 33A of the vibrating body 3 has a cylinder extending downward from the spring portion 32.
　バネ部３２の下側の面である第２面においては、製造時のばらつきにより凹凸が生じる可能性がある。バネ部３２の第２面に凹凸が生じると圧電素子４を貼り付ける際に圧電素子４とバネ部３２の第２面との接触できる面積が凹凸が大きいほど小さくなる。これにより、圧電素子４の振動がバネ部３２に伝わり難くなるため、その振動が伝わる第１筒状体３１への振動も伝わり難くなる。よって、振動板２の振動が想定している振動よりも弱くなる可能性がある。しかしながら、比較例の気泡発生装置１Ａによると、第２筒状体３３Ａおよび錘部３４Ａにより圧電素子４を貼付する面が錘部３４Ａの端部よりも内側にくるため、凹凸が生じたとしてもバネ部３２の第２面の研磨が難しい。 On the second surface, which is the lower surface of the spring portion 32, unevenness may occur due to variations during manufacturing. If the second surface of the spring section 32 has irregularities, the larger the irregularities, the smaller the contact area between the piezoelectric element 4 and the second surface of the spring section 32 when the piezoelectric element 4 is attached. This makes it difficult for the vibrations of the piezoelectric element 4 to be transmitted to the spring portion 32, so that the vibrations are also difficult to be transmitted to the first cylindrical body 31, to which the vibrations are transmitted. Therefore, there is a possibility that the vibration of the diaphragm 2 becomes weaker than expected. However, according to the bubble generator 1A of the comparative example, the surface to which the piezoelectric element 4 is attached by the second cylindrical body 33A and the weight part 34A is located inside the end of the weight part 34A, so even if unevenness occurs Polishing the second surface of the spring portion 32 is difficult.
　それに対し、実施の形態１の気泡発生装置１は、圧電素子４が設けられるバネ部３２の下側の第２面が振動体３の最も外側に露出されるので、比較例の気泡発生装置１Ａと比べ研磨が容易である。これにより、圧電素子４を貼付する面に平坦性を確保することができ、振動板２を強く振動させることができる。 In contrast, in the bubble generating device 1 of the first embodiment, the lower second surface of the spring portion 32 where the piezoelectric element 4 is provided is exposed to the outermost side of the vibrating body 3, so the bubble generating device 1A of the comparative example It is easier to polish than. Thereby, flatness can be ensured on the surface to which the piezoelectric element 4 is attached, and the diaphragm 2 can be strongly vibrated.
　実施の形態１の気泡発生装置１は、振動体３において第２筒状体３３がバネ部３２から上側に円筒が延伸されているため、比較例の気泡発生装置１Ａよりも全体の高さを低くすることで小型化することができる。 In the bubble generator 1 of the first embodiment, the second cylindrical body 33 in the vibrating body 3 has a cylinder extending upward from the spring portion 32, so that the bubble generator 1 of the first embodiment has a lower overall height than the bubble generator 1A of the comparative example. By making it lower, it can be made smaller.
　次に、気泡発生装置１での振動板２の振動について詳しく説明する。図５は、実施の形態１に係る気泡発生装置１の変位を説明するための図である。図５には、気泡発生装置１の端面図に、振動板２の振動についてシミュレーションした結果の変位が示されている。図５では、振動を開始する前の気泡発生装置１の基準位置を破線で示し、変位後の気泡発生装置１の位置を実線で示す。 Next, the vibration of the diaphragm 2 in the bubble generator 1 will be explained in detail. FIG. 5 is a diagram for explaining the displacement of the bubble generator 1 according to the first embodiment. In FIG. 5, an end view of the bubble generator 1 shows the displacement as a result of simulating the vibration of the diaphragm 2. In FIG. 5, the reference position of the bubble generator 1 before starting vibration is shown by a broken line, and the position of the bubble generator 1 after displacement is shown by a solid line.
　コントローラ２０（図１参照）からの駆動信号に基づいて、圧電素子４を第１筒状体３１の貫通方向に振動させると、例えば、図５に示すようにバネ部３２が下方に変位する。第１筒状体３１を支持しているバネ部３２の位置が下側に沈み込むことにより、第１筒状体３１の全体が下方に変位する結果、第１筒状体３１に保持されている振動板２の全体が下方に変位する。このとき、ノードは、バネ部３２の外側の端部に形成される。そのため、気泡発生装置１は、バネ部３２の外側の端部において円板部材１１を介して液体槽１０と結合することにより、圧電素子４の振動を実質的に液体槽１０に伝えずに振動板２を振動させることができる。なお、図５に示すように、錘部３４の上端部の中央付近もノードとなる。 When the piezoelectric element 4 is vibrated in the penetrating direction of the first cylindrical body 31 based on a drive signal from the controller 20 (see FIG. 1), the spring portion 32 is displaced downward as shown in FIG. 5, for example. As the position of the spring portion 32 supporting the first cylindrical body 31 sinks downward, the entire first cylindrical body 31 is displaced downward, and as a result, the first cylindrical body 31 is held by the first cylindrical body 31. The entirety of the diaphragm 2 is displaced downward. At this time, the node is formed at the outer end of the spring portion 32. Therefore, by connecting the outer end of the spring portion 32 to the liquid tank 10 via the disc member 11, the bubble generator 1 vibrates without substantially transmitting the vibration of the piezoelectric element 4 to the liquid tank 10. The plate 2 can be vibrated. Note that, as shown in FIG. 5, the vicinity of the center of the upper end of the weight portion 34 also serves as a node.
　図示していないが、圧電素子４を振動させ続けることにより、バネ部３２が下方に変位した後、バネ部３２が上方に変位する。第１筒状体３１を支持しているバネ部３２の位置が上側にせり上がることにより、第１筒状体３１の全体が上方に変位する結果、第１筒状体３１に保持されている振動板２の全体が上方に変位する。 Although not shown, by continuing to vibrate the piezoelectric element 4, the spring portion 32 is displaced downward, and then the spring portion 32 is displaced upward. As the position of the spring portion 32 supporting the first cylindrical body 31 rises upward, the entire first cylindrical body 31 is displaced upward, and as a result, it is held by the first cylindrical body 31. The entire diaphragm 2 is displaced upward.
　本実施の形態に係る気泡発生装置１では、上述したように圧電素子４を振動させることにより、振動板２自体がほぼ変形することなく、振動板２の全体が略均一に上下方向に変位する。そのため、気泡発生装置１では、バネ部３２の上下共振を利用して振動板２を平面的に駆動することにより、振動板２のどの位置においても引きちぎりの発生する加速度となり、振動板２の複数の細孔を通って送り込まれた気体を当該せん断応力により引きちぎり均等な気泡を発生させる。これにより、液体槽１０に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 In the bubble generating device 1 according to the present embodiment, by vibrating the piezoelectric element 4 as described above, the entire diaphragm 2 is substantially uniformly displaced in the vertical direction without substantially deforming the diaphragm 2 itself. . Therefore, in the bubble generator 1, by driving the diaphragm 2 in a planar manner using the vertical resonance of the spring portion 32, an acceleration that causes tearing of the diaphragm 2 is generated at any position of the diaphragm 2, and the vibration plate 2 is The gas fed through the plurality of pores is torn off by the shear stress to generate uniform bubbles. Thereby, fine bubbles can be effectively generated regardless of the type of liquid to be put into the liquid tank 10.
　（実施の形態２）
　実施の形態１の気泡発生装置１は、液体槽１０と円板部材１１を介して結合されていたが、液体槽１０とは別の構造で結合されるようにしてもよい。図６は、実施の形態２に係る気泡発生装置１Ｂが用いられる気泡発生システム１００Ｂの概略図である。 (Embodiment 2)
Although the bubble generator 1 of Embodiment 1 was coupled to the liquid tank 10 via the disc member 11, the bubble generator 1 may be coupled to the liquid tank 10 using a different structure. FIG. 6 is a schematic diagram of a bubble generation system 100B in which a bubble generation device 1B according to the second embodiment is used.
　図６に示すように、気泡発生システム１００Ｂは、錘部３４の上端部において気泡発生装置１Ｂを吊り下げるための吊り下げ部３５を備えている。吊り下げ部３５は、振動体３Ｂに含まれて一体的に形成されている。吊り下げ部３５を別部材としてもよい。気泡発生装置１Ｂは、液体槽１０から内側に突出するフランジ部１２に吊り下げ部３５を吊り下げた状態で固定部材１３により固定されている。 As shown in FIG. 6, the bubble generation system 100B includes a hanging section 35 for hanging the bubble generation device 1B at the upper end of the weight section 34. The hanging portion 35 is included in and integrally formed with the vibrating body 3B. The hanging portion 35 may be a separate member. The bubble generator 1</b>B is fixed by a fixing member 13 with a hanging part 35 suspended from a flange part 12 that projects inward from the liquid tank 10 .
　液体槽１０は、気泡発生装置１Ｂを内部に収容した状態で吊り下げ部３５と固定されている。ここで、図５に示すように、錘部３４の上端部の中央付近もノードとなる。つまり、図６の吊り下げ部３５の位置がノードとなる。そのため、気泡発生装置１Ｂは、錘部３４の端部において液体槽１０と結合することにより、圧電素子４の振動を実質的に液体槽１０に伝えずに振動板２を振動させることができる。 The liquid tank 10 is fixed to the hanging part 35 with the bubble generator 1B accommodated therein. Here, as shown in FIG. 5, the vicinity of the center of the upper end of the weight portion 34 also serves as a node. In other words, the position of the hanging portion 35 in FIG. 6 becomes a node. Therefore, the bubble generator 1B can vibrate the diaphragm 2 without substantially transmitting the vibration of the piezoelectric element 4 to the liquid tank 10 by coupling the end of the weight portion 34 to the liquid tank 10.
　気泡発生システム１００Ｂでは、第２筒状体３３の内側に液体が満たされるとともに第２筒状体３３の外側には気体が接するように構成される。気泡発生システム１００Ｂでは、錘部３４の内側に液体が満たされるとともに錘部３４の外側には気体が接するように構成されるとも言える。このようにすれば、第２筒状体３３および錘部３４の外側が液体で満たされることによる振動の減衰を抑制することができる。 The bubble generation system 100B is configured such that the inside of the second cylindrical body 33 is filled with liquid and the outside of the second cylindrical body 33 is in contact with gas. It can be said that the bubble generation system 100B is configured such that the inside of the weight part 34 is filled with liquid and the outside of the weight part 34 is in contact with gas. In this way, it is possible to suppress vibration damping due to the outside of the second cylindrical body 33 and the weight portion 34 being filled with liquid.
　（その他の変形例）
　前述の実施の形態では、第２筒状体３３の側面がノードとなるようにしてもよい。このような場合は、液体槽１０と第２筒状体３３とを円板部材１１で接合するようにすればよい。 (Other variations)
In the embodiment described above, the side surface of the second cylindrical body 33 may serve as a node. In such a case, the liquid tank 10 and the second cylindrical body 33 may be joined by the disk member 11.
　（態様）
　（１）本開示の気泡発生装置は、液体中に微細な気泡を発生させる気泡発生装置であって、複数の開口部が形成され、一方の面が液体と接し、他方の面が気体と接する位置に設けられる振動板と、一方の端により振動板を支持する第１筒状体と、第１筒状体の他方の端を第１面で支持する板状のバネ部と、バネ部の第１面の端部から第１筒状体を内包するように設けられる第２筒状体と、バネ部と反対側における第２筒状体の端部の外周に設けられる円筒状の錘部と、バネ部において第１面と反対側の第２面に配置され、バネ部を振動させる圧電素子と、を備える。 (mode)
(1) The bubble generator of the present disclosure is a bubble generator that generates fine bubbles in a liquid, in which a plurality of openings are formed, one surface is in contact with the liquid, and the other surface is in contact with gas. a diaphragm provided at a position, a first cylindrical body supporting the diaphragm by one end, a plate-shaped spring part supporting the other end of the first cylindrical body by a first surface, and a spring part. a second cylindrical body provided to enclose the first cylindrical body from the end of the first surface; and a cylindrical weight part provided on the outer periphery of the end of the second cylindrical body on the opposite side to the spring part. and a piezoelectric element disposed on a second surface of the spring portion opposite to the first surface and vibrating the spring portion.
　本開示の気泡発生装置によれば、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 According to the bubble generating device of the present disclosure, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
　（２）（１）に記載の気泡発生装置であって、圧電素子は、第２面において第２筒状体が設けられる位置よりも内側に設けられる。これにより、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 (2) In the bubble generating device according to (1), the piezoelectric element is provided on the second surface inside a position where the second cylindrical body is provided. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
　（３）（１）または（２）に記載の気泡発生装置であって、圧電素子は、第２面において第２筒状体が設けられる位置よりも内側の全面に設けられる。これにより、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 (3) In the bubble generator described in (1) or (2), the piezoelectric element is provided on the entire surface of the second surface inside the position where the second cylindrical body is provided. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
　（４）（１）～（３）のいずれかに記載の気泡発生装置であって、錘部は、圧電素子を駆動させた場合に、バネ部が設けられる側と反対側の錘部の端部が振動のノードとなる形状および位置である。これにより、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 (4) The bubble generator according to any one of (1) to (3), wherein the weight portion is provided at an end of the weight portion on the opposite side to the side where the spring portion is provided when the piezoelectric element is driven. This is the shape and position where the part becomes a vibration node. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
　（５）（１）～（４）のいずれかに記載の気泡発生装置であって、錘部は、圧電素子を駆動させた場合に、振動板が平行に上下振動する駆動が可能となる形状および位置である。これにより、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 (5) The bubble generator according to any one of (1) to (4), wherein the weight part has a shape that allows the diaphragm to vibrate vertically in parallel when the piezoelectric element is driven. and location. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
　（６）（１）～（５）のいずれかに記載の気泡発生装置であって、第２筒状体の内側に液体が満たされる。これにより、液体による振動体の減衰の影響を抑制することができる。 (6) The bubble generating device according to any one of (1) to (5), in which the inside of the second cylindrical body is filled with liquid. Thereby, the influence of damping of the vibrating body due to the liquid can be suppressed.
　（７）本開示の気泡発生システムは、（１）～（６）のいずれかに記載の気泡発生装置と、バネ部の外側の端部において気泡発生装置と接続される円板部材と、気泡発生装置を内部に収容した状態で円板部材と固定される筐体と、を備える。これにより、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 (7) The bubble generation system of the present disclosure includes the bubble generation device according to any one of (1) to (6), a disc member connected to the bubble generation device at the outer end of the spring part, and It includes a casing that is fixed to the disc member with the generator housed therein. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
　（８）本開示の気泡発生システムは、（１）～（６）のいずれかに記載の気泡発生装置と、錘部の端部において気泡発生装置を吊り下げる吊り下げ部と、気泡発生装置を内部に収容した状態で吊り下げ部と固定される筐体と、を備える。これにより、液体槽に入れる液体の種類によらず、微細な気泡を効果的に発生させることができる。 (8) The bubble generation system of the present disclosure includes the bubble generation device according to any one of (1) to (6), a hanging portion that hangs the bubble generation device at the end of the weight portion, and the bubble generation device. The housing includes a housing that is fixed to the hanging part while housed inside. Thereby, fine bubbles can be effectively generated regardless of the type of liquid put into the liquid tank.
　今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本開示の範囲は、上記した説明ではなく、請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.
　１，１Ａ，１Ｂ　気泡発生装置、２　振動板、３，３Ａ，３Ｂ　振動体、４　圧電素子、１０　液体槽、１１　円板部材、１２　フランジ部、１３　固定部材、２０　コントローラ、３１　第１筒状体、３２　バネ部、３３，３３Ａ　第２筒状体、３４，３４Ａ　錘部、３５　吊り下げ部、１００，１００Ｂ　気泡発生システム、２００　気泡。 1, 1A, 1B bubble generator, 2 diaphragm, 3, 3A, 3B vibrator, 4 piezoelectric element, 10 liquid tank, 11 disc member, 12 flange, 13 fixing member, 20 controller, 31 first cylindrical body, 32 spring part, 33, 33A second cylindrical body, 34, 34A weight part, 35 hanging part, 100, 100B bubble generation system, 200 bubbles.

Claims (8)

  1. 　液体中に微細な気泡を発生させる気泡発生装置であって、
    　複数の開口部が形成され、一方の面が液体と接し、他方の面が気体と接する位置に設けられる振動板と、
    　一方の端により前記振動板を支持する第１筒状体と、
    　前記第１筒状体の他方の端を第１面で支持する板状のバネ部と、
    　前記バネ部の前記第１面の端部から前記第１筒状体を内包するように設けられる第２筒状体と、
    　前記バネ部と反対側における前記第２筒状体の端部の外周に設けられる円筒状の錘部と、
    　前記バネ部において前記第１面と反対側の第２面に配置され、前記バネ部を振動させる圧電素子と、を備える、気泡発生装置。     A bubble generator that generates fine bubbles in a liquid,
    a diaphragm formed with a plurality of openings and provided at a position where one surface is in contact with liquid and the other surface is in contact with gas;
    a first cylindrical body supporting the diaphragm with one end;
    a plate-shaped spring portion that supports the other end of the first cylindrical body on a first surface;
    a second cylindrical body provided to enclose the first cylindrical body from an end of the first surface of the spring portion;
    a cylindrical weight part provided on the outer periphery of the end of the second cylindrical body on the opposite side to the spring part;
    A bubble generating device, comprising: a piezoelectric element disposed on a second surface of the spring section opposite to the first surface and vibrating the spring section.
  2. 　前記圧電素子は、前記第２面において前記第２筒状体が設けられる位置よりも内側に設けられる、請求項１に記載の気泡発生装置。 The bubble generator according to claim 1, wherein the piezoelectric element is provided on the second surface inside a position where the second cylindrical body is provided.
  3. 　前記圧電素子は、前記第２面において前記第２筒状体が設けられる位置よりも内側の全面に設けられる、請求項１または請求項２に記載の気泡発生装置。 The bubble generating device according to claim 1 or 2, wherein the piezoelectric element is provided on the entire surface of the second surface inside a position where the second cylindrical body is provided.
  4. 　前記錘部は、前記圧電素子を駆動させた場合に、前記バネ部が設けられる側と反対側の前記錘部の端部が振動のノードとなる形状および位置である、請求項１～請求項３のいずれか１項に記載の気泡発生装置。 The weight part has a shape and position such that when the piezoelectric element is driven, an end of the weight part on the opposite side to the side where the spring part is provided becomes a vibration node. 3. The bubble generator according to any one of 3.
  5. 　前記錘部は、前記圧電素子を駆動させた場合に、前記振動板が平行に上下振動する駆動が可能となる形状および位置である、請求項１～請求項４のいずれか１項に記載の気泡発生装置。 The weight portion has a shape and a position that allows the vibration plate to vibrate vertically in parallel when the piezoelectric element is driven. Bubble generator.
  6. 　前記第２筒状体の内側に液体が満たされる、請求項１～請求項５のいずれか１項に記載の気泡発生装置。 The bubble generating device according to any one of claims 1 to 5, wherein the inside of the second cylindrical body is filled with liquid.
  7. 　請求項１～請求項６のいずれか１項に記載の前記気泡発生装置と、
    　前記バネ部の外側の端部において前記気泡発生装置と接続される円板部と、
    　前記気泡発生装置を内部に収容した状態で前記円板部と固定される筐体と、を備える、気泡発生システム。     The bubble generator according to any one of claims 1 to 6,
    a disk portion connected to the bubble generator at an outer end of the spring portion;
    A bubble generation system comprising: a casing fixed to the disk portion with the bubble generation device housed therein.
  8. 　請求項１～請求項６のいずれか１項に記載の前記気泡発生装置と、
    　前記錘部の端部において前記気泡発生装置を吊り下げる吊り下げ部と、
    　前記気泡発生装置を内部に収容した状態で前記吊り下げ部と固定される筐体と、を備える、気泡発生システム。     The bubble generator according to any one of claims 1 to 6,
    a hanging part that hangs the bubble generator at an end of the weight part;
    A bubble generation system comprising: a casing fixed to the hanging part with the bubble generation device housed therein.
PCT/JP2023/013899 2022-05-25 2023-04-04 Bubble generation device and bubble generation system WO2023228588A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006087984A (en) * 2004-09-21 2006-04-06 Ngk Insulators Ltd Apparatus for jetting air bubble
JP2016209825A (en) * 2015-05-11 2016-12-15 国立大学法人群馬大学 Gas minimizing device
KR20200104775A (en) * 2019-02-27 2020-09-04 (주)나노바이오랩 Ultra fine bubble generator and system
WO2020189270A1 (en) * 2019-03-19 2020-09-24 株式会社村田製作所 Air bubble generation device
WO2021245995A1 (en) * 2020-06-03 2021-12-09 株式会社村田製作所 Bubble generation device and bubble generation system
CN113813804A (en) * 2020-06-18 2021-12-21 高宏鑫 Microbubble generating device and related microbubble generating apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006087984A (en) * 2004-09-21 2006-04-06 Ngk Insulators Ltd Apparatus for jetting air bubble
JP2016209825A (en) * 2015-05-11 2016-12-15 国立大学法人群馬大学 Gas minimizing device
KR20200104775A (en) * 2019-02-27 2020-09-04 (주)나노바이오랩 Ultra fine bubble generator and system
WO2020189270A1 (en) * 2019-03-19 2020-09-24 株式会社村田製作所 Air bubble generation device
WO2021245995A1 (en) * 2020-06-03 2021-12-09 株式会社村田製作所 Bubble generation device and bubble generation system
CN113813804A (en) * 2020-06-18 2021-12-21 高宏鑫 Microbubble generating device and related microbubble generating apparatus

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