WO2010041565A1 - Pompe génératrice de microbulles, aube de rotor pour pompe génératrice de microbulles et aube de stator pour pompe génératrice de microbulles - Google Patents

Pompe génératrice de microbulles, aube de rotor pour pompe génératrice de microbulles et aube de stator pour pompe génératrice de microbulles Download PDF

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Publication number
WO2010041565A1
WO2010041565A1 PCT/JP2009/066854 JP2009066854W WO2010041565A1 WO 2010041565 A1 WO2010041565 A1 WO 2010041565A1 JP 2009066854 W JP2009066854 W JP 2009066854W WO 2010041565 A1 WO2010041565 A1 WO 2010041565A1
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WO
WIPO (PCT)
Prior art keywords
blade
microbubble generating
main body
generating pump
vortex
Prior art date
Application number
PCT/JP2009/066854
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English (en)
Japanese (ja)
Inventor
阿部敏達
Original Assignee
国立大学法人筑波大学
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Priority to JP2010532876A priority Critical patent/JP5493153B2/ja
Publication of WO2010041565A1 publication Critical patent/WO2010041565A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
    • B01F23/23341—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer with tubes surrounding the stirrer
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
    • B01F23/23366—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced in front of the stirrer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • B01F27/1132—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller with guiding tubes or tubular segments fixed to and surrounding the tips of the propeller blades, e.g. for supplementary mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/548—Specially adapted for liquid pumps

Definitions

  • the present invention relates to a microbubble generating pump based on a novel principle, a moving blade for a microbubble generating pump used for the microbubble generating pump, and a stationary blade for a microbubble generating pump.
  • Microbubbles are fine bubbles having a bubble diameter of generally 10 to several tens of ⁇ m at the time of generation, and are extremely small compared to bubbles of about several millimeters in diameter that are normally generated in water. Since microbubbles are extremely small in this way, they have the property of adsorbing fine dust and floating on the surface of the water, and are applied to various processes such as washing of marine products and water purification.
  • swirl type microbubble generators are often used as the microbubble generators.
  • this swirling flow type microbubble generator a device that injects gas into the center of a swirling flow of liquid and generates microbubbles using centrifugal separation is known (for example, International Publication No. 01/097958). Issue pamphlet).
  • a swirl type microbubble generator using a vortex breakdown phenomenon is also known (see, for example, Japanese Patent Application Laid-Open No. 2005-169286 and International Publication No. 06/075452).
  • a pump especially a pump with a high head, is indispensable.
  • a turbo pump is often used as a pump having a high head.
  • the problem to be solved by the present invention is a microbubble generating pump capable of generating microbubbles with high energy efficiency, a moving blade for a microbubble generating pump used for the microbubble generating pump, and a microbubble generating pump It is to provide a stationary blade.
  • microbubble generating pump capable of generating microbubbles with high energy efficiency even with a small motor, a moving blade for a microbubble generating pump used in the microbubble generating pump, and a microblade. It is to provide a stationary blade for a bubble generating pump.
  • the present invention provides: Inside the casing, it has a moving blade, a stationary blade and a vortex breakdown nozzle arranged sequentially coaxially from the suction port toward the discharge port, Supplying the liquid sucked from the suction port to the moving blade to generate a swirling flow;
  • the swirling flow is supplied to the stationary blade, a gas is introduced into the center of the swirling flow at the stationary blade or the latter stage of the stationary blade, and the swirling flow into which the gas has been introduced is supplied to the vortex breaking nozzle to be swirled.
  • It is a microbubble generating pump that generates microbubbles by causing collapse and discharges them from the discharge port together with the liquid.
  • a moving blade typically includes a cylindrical main body and a plurality of blades provided on the outer peripheral surface of the cylindrical main body, and the plurality of blades run vertically on the outer peripheral surface of the cylindrical main body.
  • the cylindrical body is provided so as to bend from the one end portion on the liquid outlet side toward the other end portion.
  • a plurality of blades having the same shape are provided at equal intervals on the outer peripheral surface of the cylindrical main body.
  • the angle with respect to the circumferential direction (tangential direction) of the moving blade at the edge on the other end side of the plurality of blades is preferably set so that the flow of liquid supplied to the moving blade does not separate from the plurality of blades. Chosen.
  • a stationary blade typically includes a cylindrical main body and a plurality of wings provided on the outer peripheral surface of the cylindrical main body, and the plurality of wings run vertically on the outer peripheral surface of the cylindrical main body.
  • the cylindrical body is provided so as to bend as it goes from the one end to the other end on the side where the swirling flow is supplied.
  • a plurality of blades having the same shape are provided at equal intervals on the outer peripheral surface of the cylindrical main body.
  • the angle with respect to the circumferential direction of the stationary blade at the edge on the one end side of the plurality of blades is preferably selected so that the swirl flow supplied from the moving blade does not separate from the plurality of blades.
  • the angle with respect to the circumferential direction of the stationary blade at the edge on the one end side of the plurality of blades is ⁇ I
  • the ejection angle of the liquid from the moving blade when viewed from the stationary coordinate system is ⁇ F
  • the angle of attack ( ⁇ F ⁇ I ) with respect to the flow of the liquid supplied to the stationary blade is selected to be greater than 0 degree and 20 degrees or less
  • the angle of attack ( ⁇ I ⁇ F ) with respect to the flow of the liquid supplied to the stationary blade is selected to be greater than 0 degree and 20 degrees or less.
  • the plurality of blades are configured such that no gap appears when projected in the direction of the central axis of the stationary blade.
  • the stationary blade is an injection hole provided at the above-mentioned other end of the cylindrical body and the other end of the cylindrical body, for example, at the other end.
  • the air supply hole and the injection hole communicate with each other through a passage provided in the cylindrical main body.
  • a hole is provided in a portion of the casing corresponding to the air supply hole provided in one blade, and a gas introduction pipe is connected to the hole from the outside.
  • the vortex breakdown nozzle typically has a contraction part and a vortex breakdown part, and microbubbles are generated from the vortex breakdown part by supplying a swirl flow into which gas has been introduced.
  • the vortex breakdown portion has a first portion having a cylindrical shape and a second portion having a shape extending toward the outlet, and the inner peripheral surface of the first portion and the end surface of the second portion.
  • ⁇ 0 is preferably 90 degrees ⁇ 0 ⁇ 180 degrees, for example, about 100 degrees.
  • the cross-sectional area of the contracted flow part gradually decreases toward the vortex breakdown part (or the contraction part squeezes toward the vortex breakdown part), and
  • the boundary portion (or connection portion) has the same cross-sectional shape as the vortex breakdown portion.
  • the Coanda effect refers to the property of a fluid that changes the flow direction along the placed object when the object is placed in the flow.
  • the vortex breakdown nozzle may be provided separately from the casing and attached to the casing, or the casing itself may be processed into the same shape as the inner peripheral surface of the vortex breakdown nozzle.
  • the microbubble generating pump may have another moving blade and another stationary blade arranged sequentially coaxially from the suction port toward the discharge port on the suction port side of the moving blade.
  • the other moving blade typically includes a cylindrical main body and a plurality of wings provided on the outer peripheral surface of the cylindrical main body, and the plurality of the wings is a cylindrical main body.
  • the cylindrical body is provided so as to bend as it goes from the one end on the liquid outlet side to the other end.
  • the plurality of blades having the same shape as each other are provided at equal intervals on the outer peripheral surface of the cylindrical main body.
  • the other stationary blade is typically composed of a cylindrical main body and a plurality of wings provided on the outer peripheral surface of the cylindrical main body.
  • the outer peripheral surface is provided so as to be longitudinally cut in the direction of the central axis of the other stationary blade.
  • the plurality of blades having the same shape as each other are provided at equal intervals on the outer peripheral surface of the cylindrical main body.
  • the original moving blade typically includes a cylindrical main body and a plurality of wings provided on the outer peripheral surface of the cylindrical main body, and the plurality of wings are formed of the cylindrical main body. It is provided so as to bend in the longitudinal direction on the outer peripheral surface and from the one end portion on the liquid outlet side of the columnar main body toward the other end portion.
  • the original stationary vane is typically composed of a cylindrical main body and a plurality of wings provided on the outer peripheral surface of the cylindrical main body. It is provided so as to bend along the outer peripheral surface as it goes from the one end portion on the liquid inflow side to the other end portion of the cylindrical main body.
  • the moving blade may be configured in the same manner as the moving blade of the mixed flow pump.
  • the moving blades are provided on a frustoconical body whose cross-sectional area increases in a direction from the suction port to the discharge port of the microbubble generating pump, and on the outer peripheral surface of the frustoconical body.
  • the plurality of wings are arranged so as to vertically cross the outer peripheral surface of the frustoconical main body and from one end of the frustoconical main body on the liquid inflow side to the other end. Although it is provided to bend as it goes, it is not limited to this.
  • a pressure blocking nozzle provided opposite to the vortex breakdown nozzle and coaxially may be provided on the downstream end face side of the vortex breakdown nozzle.
  • a gap is formed between the downstream end face of the vortex breaking nozzle and the upstream end face of the pressure blocking nozzle, and the gap is spaced radially from the central axis of the vortex breaking nozzle and the pressure blocking nozzle.
  • the portion of the pressure blocking nozzle that faces the outlet of the vortex breaking nozzle is cut off from the downstream side of the pressure blocking nozzle at the center of the swirling flow that exits from the outlet of the vortex breaking nozzle.
  • the portion of the pressure blocking nozzle that faces the outlet of the vortex breakdown nozzle is configured not to penetrate the outlet of the vortex breakdown nozzle.
  • the microbubbles ejected from the outlet of the vortex breaking nozzle go to the outside through a gap between the downstream end face of the vortex breaking nozzle and the upstream end face of the pressure blocking nozzle.
  • the apex angle of the downstream end face of the vortex breakdown nozzle is ⁇ VB
  • the apex angle of the upstream end face of the pressure blocking nozzle is ⁇ SU
  • ⁇ SU ⁇ ⁇ VB is preferable
  • ⁇ VB ⁇ SU 0 to 20 ° is more preferable.
  • the diameter of the outlet at the downstream end face of the vortex breakdown nozzle is set to D e , the center of the vortex breakdown nozzle and the pressure blocking nozzle when the distance between the vortex breakdown nozzle and pressure shut-off nozzle is t on an axis, it is preferable that t is approximately D e / 4.
  • the exit of the vortex breaker nozzle is typically cylindrical, in which case the diameter De is constant over the entire length of the cylindrical outlet, but is not limited thereto, of it may be changed diameter D e in the length direction.
  • the pressure blocking nozzle is accommodated in the casing, and the microbubbles ejected from the outlet of the vortex breakdown nozzle pass through the gap, and further on the outer peripheral surface of the casing and the pressure blocking nozzle on the central axis of the pressure blocking nozzle. You may comprise so that it may discharge
  • the pressure blocking nozzle has a shape that swells on the downstream side, and the pressure blocking nozzle has a gap adjacent to the inner wall of the casing and the downstream end face of the pressure blocking nozzle. And a plurality of holes that merge with each other on the downstream end face of the pressure blocking nozzle, and the microbubbles ejected from the outlet pass through the gap, and further for pressure blocking You may comprise so that it may discharge
  • the aspect ratio (length / inner diameter) of these grooves or holes is preferably greater than 1. In this microbubble generating pump, vortex breakdown may be caused in the portion between the suction port of the casing and the moving blade.
  • the casing is configured so that the cross-sectional area increases toward the rotor blade after the cross-sectional area of the casing decreases from the suction port toward the rotor blade to the minimum cross-sectional area. That's fine.
  • gas is introduced from the outside into the casing between the suction port and the moving blade, preferably the portion having the minimum cross-sectional area.
  • the liquid that generates the microbubbles may be basically any type, specifically, for example, water (including hot water), various organic solvents (alcohol, acetone, toluene, etc.), Liquid fuels such as oil and gasoline.
  • the gas supplied to the center of the swirling flow and the gas introduced from the outside into the casing in the portion between the suction port and the rotor blade may be basically any type, specifically, For example, air, oxygen, ozone, hydrogen, argon and the like.
  • the present invention also provides Inside the casing, it has a moving blade, a stationary blade and a vortex breakdown nozzle arranged sequentially coaxially from the suction port toward the discharge port, Supplying the liquid sucked from the suction port to the moving blade to generate a swirling flow;
  • the swirling flow is supplied to the stationary blade, a gas is introduced into the center of the swirling flow at the stationary blade or the latter stage of the stationary blade, and the swirling flow into which the gas has been introduced is supplied to the vortex breaking nozzle to be swirled.
  • a microbubble generating pump moving blade used in a microbubble generating pump that generates microbubbles by causing collapse and discharges the liquid from the discharge port together with the liquid It consists of a cylindrical main body and a plurality of wings provided on the outer peripheral surface of the cylindrical main body, and the plurality of wings cut vertically on the outer peripheral surface of the cylindrical main body and the cylindrical shape.
  • the angle of the main blade of the plurality of blades with respect to the circumferential direction of the moving blade is set to bend from the one end portion on the liquid outlet side toward the other end portion.
  • the flow of the liquid supplied to the moving blade is selected so as not to separate from the plurality of blades.
  • the present invention also provides Inside the casing, it has a moving blade, a stationary blade and a vortex breakdown nozzle arranged sequentially coaxially from the suction port toward the discharge port, Supplying the liquid sucked from the suction port to the moving blade to generate a swirling flow;
  • the swirling flow is supplied to the stationary blade, a gas is introduced into the center of the swirling flow at the stationary blade or the latter stage of the stationary blade, and the swirling flow into which the gas has been introduced is supplied to the vortex breaking nozzle to be swirled.
  • a microbubble generating pump stationary blade used for a microbubble generating pump that generates microbubbles by causing collapse and discharges the liquid from the discharge port together with the liquid It consists of a cylindrical main body and a plurality of wings provided on the outer peripheral surface of the cylindrical main body, and the plurality of wings cut vertically on the outer peripheral surface of the cylindrical main body and the cylindrical shape.
  • the angle of the plurality of blades with respect to the circumferential direction of the stationary blade at the edge on the one end portion side is provided so as to bend from the one end portion on the side to which the swirl flow is supplied toward the other end portion.
  • the swirl flow supplied from the moving blade is selected so as not to separate from the plurality of blades.
  • this invention Inside the casing, it has a moving blade and a vortex breakdown nozzle sequentially arranged coaxially from the suction port toward the discharge port, A suction plate having a through hole in the center is provided coaxially with the moving blade and the vortex breaking nozzle so as to close the suction port at the suction port of the casing,
  • the moving blade comprises a vortex impeller having a diameter smaller than the inner diameter of the casing, Supplying the liquid sucked from the through hole of the suction plate provided in the suction port to the vortex impeller to generate a swirl flow, A gas is introduced into the center of the swirling flow, and the swirling flow into which the gas has been introduced is supplied to the vortex breakdown nozzle to cause vortex breakdown, thereby generating microbubbles and discharging the liquid together with the liquid
  • This microbubble generating pump has a stationary blade between the vortex impeller and the vortex breakdown nozzle depending on the application.
  • the microbubble generating pump what has been described in relation to the invention of the microbubble generating pump is valid as long as it is not contrary to the nature. According to the present invention, it is possible to realize a microbubble generating pump capable of generating microbubbles with high energy efficiency.
  • This microbubble generating pump is also suitable for use over a wide range and for a long time, for the purpose of purifying water areas, for example.
  • the microbubble generation pump is also suitable for generating microbubbles with a small motor.
  • FIG. 1 is a sectional view showing a microbubble generating pump according to a first embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing portions of a moving blade and a stationary blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing portions of a moving blade and a stationary blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing portions of a moving blade and a stationary blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 5 is a schematic diagram for explaining the angle of attack ⁇ of the liquid inflow end of the blade of the moving blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 6 is a sectional view showing a stationary blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 7 is a perspective view showing a stationary blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 8 is a developed view showing a specific example of the moving blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIGS. 9A and 9B are schematic diagrams showing a design example of a stationary blade of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 10 is a sectional view showing a vortex breakdown nozzle of the microbubble generating pump according to the first embodiment of the present invention.
  • FIG. 11 is a schematic diagram showing an example in which the microbubble generating pump according to the first embodiment of the present invention is applied to water purification of a pond.
  • FIG. 12 is a sectional view showing a microbubble generating pump according to a second embodiment of the present invention.
  • FIG. 13 is a schematic diagram showing a moving blade of a microbubble generating pump according to a third embodiment of the present invention.
  • 14A and 14B are schematic diagrams showing a moving blade of a microbubble generating pump according to a third embodiment of the present invention.
  • FIG. 15 is a sectional view showing a microbubble generating pump according to a fourth embodiment of the present invention.
  • FIG. 16 is a schematic diagram showing a specific example of a moving blade of a microbubble generating pump according to a fourth embodiment of the present invention.
  • FIG. 17 is a schematic diagram showing the results of an experiment conducted using the microbubble generating pump according to the fourth embodiment of the present invention.
  • FIG. 18 is a schematic diagram showing the results of an experiment conducted using the microbubble generating pump according to the fourth embodiment of the present invention.
  • FIG. 19 is a sectional view showing a microbubble generating pump according to a fifth embodiment of the present invention.
  • FIG. 20 is a schematic diagram showing the results of an experiment conducted using the microbubble generating pump according to the fifth embodiment of the present invention.
  • FIG. 21 is a schematic diagram showing the results of an experiment conducted using the microbubble generating pump according to the fifth embodiment of the present invention.
  • FIG. 22 is a sectional view showing a microbubble generating pump according to a sixth embodiment of the present invention.
  • FIG. 23 is a sectional view showing a microbubble generating pump according to a seventh embodiment of the present invention.
  • FIG. 24 is a sectional view showing a microbubble generating pump according to an eighth embodiment of the present invention.
  • FIG. 25 is a perspective view showing a suction plate of a microbubble generating pump according to an eighth embodiment of the present invention.
  • FIG. 26 is a plan view showing a design example of the vortex impeller of the microbubble generating pump according to the eighth embodiment of the present invention.
  • FIG. 27 is a plan view showing a design example of the vortex impeller of the microbubble generating pump according to the eighth embodiment of the present invention.
  • FIG. 28 is a plan view showing a design example of the vortex impeller of the microbubble generating pump according to the eighth embodiment of the present invention.
  • FIG. 29 is a side view of the vortex impeller shown in FIG.
  • FIG. 30 is a sectional view showing an example of a suction plate when air is supplied from the suction plate in the microbubble generating pump according to the eighth embodiment of the present invention.
  • FIG. 31 is a sectional view showing another example of the suction plate when air is supplied from the suction plate in the microbubble generating pump according to the eighth embodiment of the present invention.
  • FIG. 32 is an enlarged cross-sectional view showing a bent portion of a corner of the through hole of the suction plate shown in FIG.
  • FIG. 33 is a sectional view showing a microbubble generating pump according to a ninth embodiment of the present invention.
  • FIG. 34 is a plan view showing a specific example of a stationary blade of a microbubble generating pump according to an eleventh embodiment of the present invention.
  • FIG. 35 is a side view of the stationary blade shown in FIG. 34.
  • FIG. 36 is a sectional view showing a microbubble generating pump according to a twelfth embodiment of the present invention.
  • FIG. 1 shows a microbubble generating pump according to a first embodiment of the present invention.
  • the microbubble generating pump includes a moving blade 14, a stationary blade 15, and a stationary blade 15 that are sequentially arranged coaxially from a suction port 12 toward a discharge port 13 inside a casing 11 formed of a cylindrical pipe.
  • a vortex breakdown nozzle 16 is provided.
  • the moving blade 14 has a shaft 14 a provided integrally with the moving blade 14.
  • the shaft 14 a is directly connected to the rotating shaft of the motor 17, and the rotating blade 14 can be rotated around the central axis by rotating the shaft 14 a by the motor 17.
  • a submersible motor is used as the motor 17, but is not limited to this.
  • this microbubble generating pump When this microbubble generating pump is placed in a liquid such as water, the liquid sucked from the suction port 12 is supplied to the moving blade 14 rotating around the central axis to generate a swirling flow. That is, the liquid sucked from the suction port 12 is closed at the center by a later-described cylindrical main body 14b of the rotor blade 14, and therefore a groove between the blades 14c existing on the outer peripheral surface of the main body 14b of the rotor blade 14. The swirl flow is generated by the rotation of the moving blade 14 around the central axis.
  • This swirling flow is supplied to the stationary blade 15, and a gas is introduced into the center of the swirling flow at the stationary blade 15 or the subsequent stage of the stationary blade 15, and the swirling flow with the gas introduced into the center is supplied to the vortex breakdown nozzle 16.
  • the vortex breakdown nozzle 16 microbubbles are generated by causing vortex breakdown using the Coanda effect and discharged from the discharge port 13 together with the liquid.
  • the swirl flow into which the gas has been introduced enters the vortex breakdown nozzle 16
  • the swirl flow is contracted, and a vortex breakdown occurs due to the generation of a positive pressure gradient from the discharge port 13 toward the center of the stationary blade 15. . Due to this vortex breakdown, large bubbles are finely crushed and microbubbles are generated.
  • FIG. 2 and 3 show ⁇ F ⁇ ⁇ F ( ⁇ F Shows the rotor blade 14 and the stator blade 15 in the case of the angle of the terminal portion 15d of the stator blade 15 with respect to the circumferential direction of the blade 15b.
  • Figure 4 shows ⁇ F ⁇ F
  • the moving blade 14 and the stationary blade 15 in the case of are shown.
  • the rotor blade 14 is composed of a cylindrical main body 14b and a plurality of same-shaped pieces provided on the outer peripheral surface of the cylindrical main body 14b at the same angle from each other. Wing 14c.
  • the plurality of blades 14c are arranged so as to cut vertically on the outer peripheral surface of the cylindrical main body 14b, and from one end of the cylindrical main body 14b on the liquid outlet side, that is, from the end 14d to the other end, that is, the start end. It is provided to bend as it goes to 14e.
  • the angle with respect to the circumferential direction of the moving blade 14 at the edge on the start end portion 14e side of the plurality of blades 14c is selected so that the liquid flow supplied to the moving blade 14 does not separate from the plurality of blades 14c.
  • the angle with respect to the circumferential direction of the moving blade 14 at the edge on the start end portion 14e side of the plurality of blades 14c is ⁇ .
  • the angle of attack ⁇ ( ⁇ with respect to the flow of the liquid supplied to the moving blade 14 as viewed from the rotating coordinate system rotating with the moving blade 14 I - ⁇ I ) Is larger than 0 degree and 20 degrees or less, typically 5 degrees or more and 20 degrees or less (see FIG. 5).
  • ⁇ I Tan -1 (U I / R ⁇ )
  • U I I the flow velocity of the liquid sucked into the moving blade 14 when viewed from the stationary coordinate system
  • R is the radius of the moving blade 14
  • ⁇ is the angular velocity of the moving blade 14.
  • an angle ⁇ with respect to the circumferential direction of the moving blade 14 at the edge on the terminal end 14d side of the plurality of blades 14c.
  • F Is selected, for example, from 85 degrees to 90 degrees.
  • Q volume flow rate of the liquid passing through this microbubble generating pump
  • S I , S F Are the fluid cross-sectional areas at the start end 14e and the end end 14d of the rotor blade 14, respectively.
  • the stationary blade 15 includes a columnar body 15a and a plurality of blades 15b having the same shape and provided on the outer peripheral surface of the columnar body 15a at the same angle.
  • the plurality of wings 15b are arranged so as to be longitudinally cut on the outer peripheral surface of the cylindrical main body 15a and to one end on the side to which the swirling flow of the cylindrical main body 15a is supplied, that is, from the start end 15c to the other end, That is, it is provided so as to bend toward the end portion 15d.
  • the stationary blade 15 is designed as follows.
  • the angle ⁇ of the blade 15b at the terminal end 15d of the stationary blade 15 with respect to the circumferential direction of the stationary blade 15 from the condition that causes the vortex breakdown that is, the condition that the swirling flow velocity is twice or more the flow velocity in the central axis direction.
  • ⁇ F And ⁇ F The size is compared with (the ejection angle of the fluid from the moving blade 14 as seen from the stationary coordinate system), and determined so as to satisfy the following condition, that is, the condition that the flow does not separate.
  • the plurality of blades 15 b are configured such that no gap appears when projected in the central axis direction of the stationary blade 15. Specifically, the plurality of blades 15 b are projected in the central axis direction of the stationary blade 15. Sometimes configured to overlap each other.
  • the final flow velocity direction is ⁇ F
  • the design may be made so as to satisfy the vortex breakdown condition in the direction of the flow velocity.
  • the final flow direction is ⁇ F
  • the plurality of blades 15b need to be configured to overlap each other when projected in the direction of the central axis of the stationary blade 15.
  • the plurality of blades 15b are configured to overlap each other when projected in the direction of the central axis of the stationary blade 15, so that a reverse flow (pump generated due to the low pressure in the casing 11 due to the generated swirling flow) It is also possible to effectively prevent the liquid sucked from the discharge port 13 from being discharged from the suction port 12 of the pump.
  • 6 and 7 are a longitudinal sectional view and a perspective view of the stationary blade 15, respectively. As shown in FIGS. 6 and 7, one of the plurality of blades 15b of the stationary blade 15 is provided with an air supply hole 15e. An injection hole 15f is provided on the central axis of the other end 15d of the cylindrical main body 15a.
  • a hole (not shown) is provided in a portion of the casing 11 corresponding to the air supply hole 15e provided in one blade 15b, and a pipe for gas introduction (not shown) is connected to the hole from the outside.
  • a specific example of the rotor blade 14 is shown in FIG.
  • the moving blade 14 has four blades 14c.
  • FIG. 8 is a developed view in the circumferential direction of the outer peripheral surface of the cylindrical main body 14b of the moving blade 14, and shows the shape of the four blades 14c.
  • the length (blade length) of the moving blade 14 in the central axis direction is 4.1 cm.
  • FIG. 9A shows a specific example of the stationary blade 15, and FIG. 9B shows a state where the stationary blade 15 is inside the casing 11.
  • the stationary blade 15 has four blades 15b.
  • the arrows indicate the direction of flow.
  • the four blades 15b are interposed between them when projected in the direction of the central axis of the stationary blade 15. It is comprised so that a clearance gap may not arise.
  • the angle formed by the circumferential edge of the edge on the side where the swirling flow of the blade 15b of the stationary blade 15 exits is approximately 0 degrees.
  • the details of the vortex breakdown nozzle 16 are shown in FIG. As shown in FIG.
  • the vortex breakdown nozzle 16 includes a contracted flow portion 16a and a vortex collapse portion 16b that are formed into a tapered shape.
  • the contracted flow portion 16a is a tube that is tapered, and the narrow side is connected to the vortex collapse portion 16b.
  • the narrowing angle (taper angle) 16e of the contracted flow portion 16a depends on the size of the casing 11 and is selected as necessary. An example of the angle 16e is about 20 degrees, but is not limited thereto.
  • a tapered portion 16h is provided at the tip of the vortex breaking portion 16b, and the outlet extends in a tapered shape.
  • the exit angle (taper angle) 16i of the vortex breakdown part 16b is, for example, about 60 degrees or 80 degrees, but is not limited thereto.
  • the air column formed at the center of the swirl flow 18 passes through the vortex breakdown portion 16b and sticks as bubbles in the tapered portion 16h by the Coanda effect.
  • the bubbles stuck to the taper portion 16h are sheared or crushed by the swirling flow 18, and microbubbles are generated.
  • the time during which the bubbles are subjected to shearing becomes longer, and the atomization of the bubbles is promoted.
  • the swirling flow 18 enters the tapered portion 16h from the vortex breaking portion 16b and spreads in a tapered shape, so that the air column also spreads, and the bubbles stick to the tapered portion 16h.
  • the dimensions of the vortex breakdown nozzle 16 are about the same as the inner diameter 16f for the length 16g of the cylindrical vortex breakdown portion 16b.
  • an application example of this microbubble generating pump will be described. Below, the example which applied this microbubble generation pump to the water purification of pond water is demonstrated. An example of this is shown in FIG. As shown in FIG. 11, in this example, the microbubble generating pump 22 is installed near the bottom 21 a of the pond 21, the microbubbles 23 are generated from the microbubble generating pump 22, and supplied to the water of the pond 21. To do. For example, a submersible motor is used as the motor 17 of the microbubble generating pump 22.
  • the electric power of the motor 17 is supplied via a cable 25 from a solar cell panel 24 that receives sunlight and generates electric power. Since the energy efficiency of the microbubble generating pump 22 is high and therefore the power consumption of the motor 17 is also low, the power supplied by the solar cell panel 24 is sufficient to drive the motor 17. For example, the power generation capacity of the solar cell panel 24 may be about 0.3 kW.
  • the microbubble generating pump includes a moving blade 14, a stationary blade 15, and a vortex breaking nozzle 16 that are sequentially arranged coaxially from the suction port 12 toward the discharge port 13 inside the casing 11.
  • microbubbles are generated by sucking the liquid from the suction port 12 and causing the vortex breakup nozzle 16 to cause vortex collapse, and the microbubbles are discharged from the discharge port 13 together with the liquid. Can be generated. Moreover, this microbubble generating pump is suitable for low flow and large flow rate applications. For this reason, this microbubble generating pump is suitable for application over a wide range of time for the purpose of purifying water areas.
  • a microbubble generating pump according to a second embodiment of the present invention will be described. As shown in FIG. 12, this micro-bubble generating pump is sequentially arranged coaxially from the suction port 12 to the discharge port 13 inside the casing 11 formed of a cylindrical pipe, as in the first embodiment.
  • the microbubble generating pump includes a moving blade 31 and a stationary blade 32 that are sequentially arranged coaxially from the suction port 12 toward the discharge port 13 on the suction port 12 side of the moving blade 14.
  • the moving blade 31 is provided integrally with the shaft 14 a of the moving blade 14, and the shaft 14 a can be rotated around the central axis together with the moving blade 14 by rotating the shaft 14 a by the motor 17.
  • the moving blade 31 includes a cylindrical main body 31a and a plurality of blades 31b provided on the outer peripheral surface of the cylindrical main body 31a.
  • the plurality of blades 31b are arranged so as to cut vertically on the outer peripheral surface of the columnar main body 31a and from one end of the columnar main body 31a on the liquid outlet side, that is, from the terminal end 31c to the other end, that is, the start end. It is provided so as to bend toward 31d.
  • the plurality of blades 31b have the same shape on the outer peripheral surface of the cylindrical main body 31a and are provided at equal intervals.
  • the stationary blade 32 includes a columnar main body 32a and a plurality of blades 32b provided on the outer peripheral surface of the columnar main body 32a.
  • the plurality of blades 32 b are provided so as to cut vertically on the outer peripheral surface of the cylindrical main body 32 a in the direction of the central axis of the stationary blade 32. That is, the plurality of blades 32 b are provided in a direction parallel to the central axis of the stationary blade 32.
  • the moving blade 14 includes a cylindrical main body 14b and a plurality of blades 14c provided on the outer peripheral surface of the cylindrical main body 14b. Are provided so as to be longitudinally cut on the outer peripheral surface of the columnar main body 14b and to bend from the end portion 14d to the start end portion 14e of the columnar main body 14b.
  • the stationary blade 15 includes a cylindrical main body 15a and a plurality of blades 15b provided on the outer peripheral surface of the cylindrical main body 15a. Are provided so as to be longitudinally cut on the outer peripheral surface of the columnar main body 15a and to bend from the start end portion 15c to the end portion 15d of the columnar main body 15a.
  • a high-lift microbubble generating pump can be realized as compared with the microbubble generating pump according to the first embodiment.
  • the advantage of being able to Next explained is a microbubble generating pump according to the third embodiment of the invention.
  • the moving blade 14 in the microbubble generating pump according to the first embodiment has the same shape as the moving blade of the mixed flow pump that generates the head by the centrifugal force of the liquid.
  • An example of the shape of the moving blade 14 is shown in FIGS. 13, 14A and 14B.
  • the shape of the edge on the suction port 12 side of the plurality of blades 14c of the moving blade 14 is selected to be a shape capable of obtaining a high head, and the shape on the discharge port 13 side is a shape capable of obtaining the swirling flow 18. Has been chosen.
  • the moving blade 14 is formed on, for example, a truncated cone-shaped main body 14b whose cross-sectional area increases in the direction from the suction port 12 to the discharge port 13 of the microbubble generating pump, and the outer peripheral surface of the main body 14b.
  • the blades 14c are provided so as to be longitudinally cut on the outer peripheral surface of the main body 14b and to bend from the terminal portion to the starting end portion of the main body 14b.
  • the shape on the discharge port 13 side of the plurality of blades 14c of the moving blade 14 is selected to be a shape capable of obtaining the swirling flow 18, which is largely different from the mixed flow pump.
  • the shape of the blade 14c in the mixed flow pump is shown by a one-dot chain line in FIG. 14B.
  • Other configurations of the microbubble generating pump are the same as those of the microbubble generating pump according to the first embodiment.
  • the third embodiment in addition to the same advantages as those of the first embodiment, it is possible to obtain the advantage that a higher-lift microbubble generating pump can be obtained.
  • a microbubble generating pump according to the fourth embodiment of the invention As shown in FIG. 15, in this microbubble generating pump, a pressure blocking nozzle 41 is provided at the tip (downstream side) of the vortex breaking nozzle 16 in the microbubble generating pump according to the first embodiment. .
  • a pressure blocking nozzle 41 is installed on the downstream end face P1 side of the vortex breakdown nozzle 16b, coaxially with the vortex breakdown nozzle 16 and facing the vortex breakdown nozzle 16b. Yes.
  • the outer shape of the pressure blocking nozzle 41 has a cylindrical shape like the vortex breaking nozzle 16 and has the same diameter as the outer diameter of the casing 11, for example, but is not limited thereto.
  • the vortex breaking portion 16b has a cylindrical bubble outlet T.
  • a gap 42 is formed between the end face P1 on the downstream side of the vortex breaking portion 16b and the end face P2 on the upstream side of the pressure blocking nozzle 41.
  • the gap 42 gradually increases linearly from the central axis of the vortex breaking nozzle 16 and the pressure blocking nozzle 41 in the radial direction.
  • the portion of the pressure blocking nozzle 41 facing the jet outlet T is configured to block the low pressure portion at the center of the swirling flow coming out of the jet outlet T from the downstream side of the pressure blocking nozzle 41. ing.
  • a through hole is not provided in a portion of the pressure blocking nozzle 41 that faces the ejection port T.
  • the portion of the pressure blocking nozzle 41 that faces the jet outlet T does not penetrate the vortex collapse portion 16b, more specifically, the jet outlet T.
  • a gas-liquid mixed phase flow (for example, a mixed phase flow of water and air) is ejected from the outlet T of the vortex breaking portion 16b, and microbubbles are generated at the edge 16k and the tapered portion 16h. Microbubbles are released into (liquid such as water).
  • the following effects can be obtained by providing the pressure blocking nozzle 41 at the tip of the vortex breaking nozzle 16.
  • Noise accompanying generation of sound waves can be reduced.
  • the generation of sound waves causes noise problems when the microbubble generation pump is used for consumer goods or water quality improvement, and the sound waves emitted from the microbubble generation pump are the swirl frequency and the natural frequency of the air column formed inside the pump. There are two types of vibrations.
  • the pressure blocking nozzle 41 is installed on the downstream side of the vortex breakdown nozzle 16, the vortex breakdown can be changed from the spiral type to the bubble type.
  • the bubble-type vortex collapse has a small external force to expand and contract the air column, so the air column sound is reduced.
  • the pressure blocking nozzle 41 is fixed to the end face P1 side on the downstream side of the vortex breakdown nozzle 16, the turbulence of the swirling flow 18 is reduced, and swirling noise and air column noise are reduced.
  • (B) It is possible to prevent re-suction of the released fluid when released in water. ⁇ The floc is destroyed and dispersed in the liquid can be prevented by re-inhaling the released fluid when the floc is floated and separated by microbubbles.
  • the inner diameter of the casing 11 is 79 mm
  • the inner diameter 16f of the vortex breaking portion 16b of the vortex breaking nozzle 16 is 30 mm
  • the pressure blocking nozzle 41 is used (between the vortex breaking nozzle 16 and the pressure blocking nozzle 41).
  • the minimum flow distance h 3.0 mm) and when not used were measured for flow rate and suction pressure.
  • the outer diameter of the rotor blade 14 is 78 mm
  • the length (blade length) of the cylindrical main body 14 b is 41.8 mm or 23.0 mm
  • the diameter of the main body 14 b is 38 mm
  • the height of the blade 14 c is high.
  • the length is 20 mm
  • the number of blades 14c is four.
  • the experiment was performed by cutting the front edge portion of the blade 14c and sufficiently increasing the cross-sectional area of the groove between the blades 14c.
  • the outer diameter of the stationary blade 15 is 79 mm
  • the length (blade length) of the cylindrical main body 15a is 10 mm
  • the diameter of the main body 15a is 38 mm
  • the height of the blade 15c is 20 mm
  • the number of the blades 15c is four. Further, a submersible motor was used as the motor 17.
  • 17 and 18 show the experimental results. 17 and 18 are plots of the flow rate (L / min) and the suction pressure (kPa) against the power consumption of the submersible motor. As shown in FIGS. 17 and 18, both the flow rate and the suction pressure are greatly affected by the pressure blocking nozzle 41.
  • the minimum distance h between the vortex breaking nozzle 16 and the pressure blocking nozzle 41 to be the optimum value of 3.0 mm, the flow rate is increased by more than 50% compared to when the pressure blocking nozzle 41 is not provided. .
  • the flow rate and suction pressure at the same power consumption are increased. This indicates that the energy efficiency of the microbubble generating pump can be further improved by optimally selecting the shape of the blade 14c.
  • the vortex breaking nozzle 16 is accommodated and fixed inside the casing 11, whereas in the microbubble generating pump, as shown in FIG.
  • the casing 11 corresponding to the vortex breakdown nozzle 16 is processed into the same shape as the inner peripheral surface of the contracted flow portion 16 a and the vortex breakdown portion 16 b of the vortex breakdown nozzle 16, and this portion becomes the vortex breakdown nozzle 16. ing.
  • the motor 17 for driving the rotor blade 14 is not shown. Others are the same as those of the microbubble generating pump according to the first embodiment. The results of experiments using this microbubble generation pump will be described.
  • each part of the microbubble generating pump is set as shown in FIG. 19 and a pressure blocking nozzle 41 (not shown in FIG. 19) is used (vortex breaking nozzle 16 and pressure blocking).
  • a flange portion 11 a is provided on the suction port 12 side of the casing 11, and the suction port 12 side is covered with a bottom plate 51. The bottom plate 51 was fixed to the flange portion 11a with screws 52.
  • the moving blade 14 is rotated by a motor 17, but only the rotating shaft 17a of the motor 17 directly connected to the shaft 14a of the moving blade 14 is shown in FIG.
  • a submersible motor was used as the motor 17. This submersible motor can be loaded up to 0.55 kW with a rating of 0.3 kW.
  • a through hole 51a having a diameter larger than the diameter of the rotating shaft 17a is provided. And water is sucked from the gap between the through hole 51a and the rotating shaft 17a.
  • 20 and 21 show the experimental results. 20 and 21 plot the flow rate (L / min) and the suction pressure (kPa) against the power consumption of the submersible motor. As shown in FIGS.
  • both the angles of both ends of the blade 14c are in the circumferential direction of the cylindrical main body 14b so that the rotor blade 14 can generate a swirling flow not only downstream but also upstream.
  • the angle is about 90 to 85 degrees.
  • the portion of the casing 11 corresponding to the vortex breaking nozzle 16 is compressed. It is processed into the same shape as the inner peripheral surface of the flow part 16a and the vortex breaking part 16b.
  • the casing 11 in the portion between the suction port 12 and the moving blade 14 has a cross-sectional area that decreases from the suction port 12 toward the moving blade 14, and reaches the minimum cross-sectional area. It is processed to increase again toward. Gas (air or the like) is supplied from the outside to the inside of the casing 11, preferably the portion having the smallest cross-sectional area, between the inlet 12 and the rotor blade 14.
  • the condition for causing vortex breakdown is that the flow becomes supercritical in the section of the cross section where the cross sectional area is minimized.
  • the pump flow rate is Q
  • the radius of the cross section where the cross sectional area is minimum is r
  • the rotational angular velocity of the moving blade 14 is ⁇
  • S e cr Is about 2 in terms of critical circulation.
  • the cross-sectional area of the casing 11 is reduced from the suction port 12 toward the moving blade 14, the liquid sucked from the suction port 12 is contracted to generate a swirling flow.
  • the angle of attack ⁇ on the upstream side (suction port 12 side) of the blade 14c of the rotor blade 14 is set to be large so that a swirl flow is easily generated, specifically, for example, 20 degrees ⁇ ⁇ 90 degrees. Is selected within the range.
  • This swirling flow becomes unstable (instability of the vortex core) and enters into a portion where the cross-sectional area increases from the minimum cross-sectional area portion of the casing 11, and vortex collapse occurs.
  • the flow changes from supercritical to subcritical, and strong turbulence is generated.
  • this microbubble generation pump in addition to the vortex breakdown nozzle 16 that causes the vortex breakdown using the Coanda effect, the instability of the vortex core is provided in the preceding stage (on the suction port 12 side). Therefore, it can be considered that another vortex breakdown nozzle for causing vortex breakdown is provided.
  • this microbubble generating pump can be used in water, for example, and can produce a large amount of air having a volume flow rate of several percent of the volume flow rate of water and release it in water in a large amount unless microbubble generation is involved.
  • a microbubble generating pump according to the seventh embodiment of the invention a microbubble generating pump according to the seventh embodiment of the invention.
  • a submersible motor is used as the motor 17, but it is not always necessary to use a submersible motor. Therefore, in this microbubble generating pump, a case where a normal motor other than the submersible motor is used as the motor 17 will be described. That is, as shown in FIG. 23, a hole is made in the casing 11, and the rotating shaft 14a of the rotor blade 14 is passed through this hole. Then, a mechanical seal is applied to the motor 17.
  • a microbubble generating pump according to the eighth embodiment of the invention.
  • the suction plate 61 and the vortex impeller 62 are provided with a stationary blade instead of the moving blade 14 of the micro-bubble generating pump according to the first embodiment.
  • 15 and the vortex breaking nozzle 16 are sequentially provided from the suction port 12 toward the stationary blade 15.
  • the suction plate 61 is fixed to the casing 11.
  • the vortex impeller 62 is provided with a shaft 63 directly connected to the tip of the rotating shaft 17 a of the motor 17, and the vortex impeller 62 can be rotated by rotating the shaft 63 by the motor 17. It can be done.
  • a perspective view of the suction plate 61 is shown in FIG. As shown in FIG. 25, a through hole 61a is provided in the center of the suction plate 61. The cross-sectional shape of the through hole 61a in the direction perpendicular to the central axis of the suction plate 61 is circular.
  • the suction plate 61 is fitted into the suction port 12 of the casing 11 and closes the suction port 12 except for the through hole 61a.
  • the vortex impeller 62 includes a disk 62a and a plurality of blades 62b provided on one surface of the disk 62a perpendicular to the surface. These blades 62b are rotationally symmetric about the central axis of the vortex impeller 62 and have a radius D from the central axis of the disk 62a. mi Extending from the circumference of the disc to the outer circumference of the disc 62a.
  • the shape of the blades 62b is not particularly limited as long as a swirl flow can be generated by the liquid entering the swirl impeller 62. For example, as shown in FIG.
  • FIG. 28 shows a plan view of the vortex impeller 62. As shown in FIG. FIG. 29 shows a side view of the vortex impeller 62. FIG. 28 shows a case where the number of blades 62b is five as an example, but the present invention is not limited to this.
  • the angle formed by the radial direction of the disc 62a and the tangent of the blade 62b is ⁇ Fdeg (Angle expressed in degrees).
  • the diameter of the vortex impeller 62 is D m0
  • D m0 ⁇ D is selected. Further, the portion (diameter D) where the vortex impeller 62 does not have the vane 62b. mi ), A jet passing through the through hole 61a of the suction plate 61 is formed.
  • the diameter of the through hole 61a of the suction plate 61 is D s
  • D mi in order to increase the suction pressure
  • D mi in general
  • D mi in order to increase the suction pressure
  • the diameter of the shaft 63 is set to D to ensure a fluid cross-sectional area.
  • p D s > D p
  • the diameter D of the shaft 63 p Is D s Should be as small as possible, for example D s ⁇ 2D p Is preferable.
  • FIG. 30 is a sectional view including the central axis of the suction plate 61.
  • an air supply hole 61c is provided on the inner surface of the through hole 61a.
  • the air supply hole 61 c reaches the outer peripheral surface of the suction plate 61 through a passage 61 d provided in the suction plate 61.
  • a hole (not shown) is provided in the casing 11 corresponding to the passage 61d, and a pipe for gas introduction (not shown) is connected to the hole from the outside.
  • the shape of the through hole 61a of the suction plate 61 is preferably selected as follows.
  • the through hole 61a has a tapered shape in which the diameter of the through hole 61a gradually increases in the liquid flow direction.
  • the taper angle ⁇ is, for example, about 2 to 5 degrees, but is not limited to this.
  • the corner of the through hole 61a has a large curvature so that the flow is separated. By doing so, as shown in FIG. 32, an air film 64 is generated on the inner surface of the through hole 61a, so that gas is evenly supplied in the circumferential direction of the vortex impeller 62.
  • the advantage of supplying air from the suction plate 61 is that the bubbles are crushed by the vortex impeller 62 and are pressurized and dissolved by the lift of the vortex impeller 62, so that the generation efficiency of fine bubbles is improved. Be able to.
  • the stator blade 15 can be designed as follows.
  • the radius of the stationary blade 15 is R D
  • D D m0 ⁇ 2R I
  • Region I a region without the blades 62b of the vortex impeller 62 (r ⁇ R in )
  • Region II Region where the blade 62b of the vortex impeller 62 is present (R in ⁇ R ⁇ R I )
  • Region III Region outside the vortex impeller 62 (r> R I )
  • Q is a flow rate supplied from the through hole 61a of the suction plate 61, that is, the suction port.
  • the pressure P caused by this flow ignores the viscosity, and Euler's equation of motion Calculate from
  • ⁇ is the density of the fluid.
  • the pressure is Asymptotically.
  • the same advantages as those of the first embodiment can be obtained, and microbubbles can be generated efficiently using the small motor 17 with low power consumption.
  • FIG. 33 when it is desired to reduce the swirl direction flow velocity of the flow generated by the vortex impeller 62 and increase the axial flow velocity, the vane 15b of the stationary blade 15 is formed in a straight line as a simple shape. To do.
  • microbubble generating pump according to the tenth embodiment of the invention.
  • a motor 17 is incorporated in the main body 15a of the stationary blade 15, and the vortex impeller 62 can be rotated by the motor 17.
  • Other configurations of the microbubble generating pump are the same as those of the microbubble generating pump according to the eighth embodiment.
  • the rotating shaft 17a of the motor 17 does not penetrate the through hole 61a of the suction plate 61.
  • microbubble generating pump according to the eleventh embodiment of the invention.
  • this microbubble generating pump unlike the microbubble generating pump according to the eighth embodiment, when the blade 15b of the stationary blade 15 is projected in the direction of the central axis of the stationary blade 15, these blades 15b overlap each other. Not. That is, since the flow generated by the vortex impeller 62 does not generate a backflow, it is not necessary to overlap the blade 15b of the stationary blade 15.
  • the gap between the blades 15b becomes large, and suspended matters (fibers, solids, etc.) in the liquid can be easily passed through the gap.
  • the blade 15b of the stationary blade 15 is projected in the direction of the central axis of the stationary blade 15, there is a gap between the blade 15b and the blade 15b.
  • ⁇ F > ⁇ F Therefore, the shape of the blade 15b of the stationary blade 15 can be the same as that of the first embodiment.
  • FIG. 34 and 35 A side view of the stationary blade 15 is shown in FIG. As shown in FIGS. 34 and 35, each of the plurality of blades 15b of the stationary blade 15 is provided with an air supply hole 15e. An injection hole 15f is provided on the central axis of the start end 15d of the main body 15a.
  • a hole (not shown) is provided in a portion of the casing 11 corresponding to each air supply hole 15e, and a gas introduction pipe (not shown) is connected to the hole from the outside.
  • ⁇ is 20 degrees or more, separation occurs, and the flow rate becomes smaller.
  • the same advantages as in the eighth embodiment can be obtained, and when the blade 15b of the stationary blade 15 is projected in the direction of the central axis of the stationary blade 15, the blade 15b. Since there is a gap between the blade 15b and the blade 15b, the flow rate through the stationary blade 15 can be increased, and the generation efficiency of microbubbles can be sufficiently increased.
  • a microbubble generating pump according to the twelfth embodiment of the invention As shown in FIG. 36, in this microbubble generating pump, unlike the microbubble generating pump according to the eighth embodiment, no stationary blade 15 is provided. The conditions for generating vortex breakdown by the vortex breakdown nozzle 16 without providing the stationary blade 15 are shown below.
  • the radius of the inner surface of the vortex breakdown part 16b of the vortex breakdown nozzle 16 is r e If it is set as (1/2 of the inner diameter 16f of the vortex collapse part 16b), the average flow velocity in the axial direction in the vortex collapse part 16b is Given in.
  • the swirling flow velocity in the vortex breaking portion 16b of the vortex breaking nozzle 16 can be calculated assuming that the swirling flow generated by the vortex impeller 62 follows the law of circulation. Circulation C generated by the vortex impeller 62 is In the vortex breakdown portion 16b of the vortex breakdown nozzle 16, the circumferential flow velocity is V e After all, It becomes. From equations (20) and (21) Is obtained. U F Is based on continuous flow conditions It becomes.
  • the circulation number ⁇ of the vortex breakdown part 16b of the vortex breakdown nozzle 16 e Is It becomes. Since the flow rate Q generated in the vortex impeller 62 is proportional to the area and rotational speed of the blade 62b, And can be put.
  • ⁇ is the radius r of the inner surface of the vortex breakdown portion 16b of the vortex breakdown nozzle 16.
  • ⁇ for vortex breakdown to occur e Since it needs to be ⁇ 2, If the vortex impeller 62 and the vortex breakdown nozzle 16 are designed so as to be, even if there is no stationary blade 15, vortex breakdown can be generated and microbubbles can be generated. From dimensional analysis, ⁇ is R s / R e And ⁇ F Therefore, if the relationship between parameters is specified in equation (27), It becomes. From formula (28), a smaller h is advantageous for vortex breakdown. This is because the swirl flow is stronger than the flow rate. R s ⁇ r e In this case, that is, when the vortex breaking nozzle 16 is not provided, the flow rate becomes maximum. It becomes.
  • the present invention is not limited to the above-described embodiments, and various modifications based on the technical idea of the present invention are possible.
  • the numerical values, shapes, structures, arrangements, and the like given in the above-described embodiments are merely examples, and different numerical values, shapes, structures, arrangements, etc. may be used as necessary.

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Abstract

L'invention concerne une pompe génératrice de microbulles comprenant une aube de rotor, une aube de stator et une tuyère à rupture de tourbillon disposée de façon coaxiale en série entre un orifice d’admission et un orifice de refoulement à l’intérieur d’un carter. Un liquide aspiré par l’orifice d’admission est amené jusqu’à l’aube de rotor pour générer un écoulement tourbillonnant. Cet écoulement tourbillonnant est amené jusqu’à l’aube de stator et un gaz est introduit au milieu de l’écoulement tourbillonnant soit au niveau de l’aube de stator, soit après l’aube de stator. L’écoulement tourbillonnant dans lequel le gaz a été introduit est amené jusqu’à la tuyère à rupture de tourbillon où se produit la rupture du tourbillon, des microbulles étant de ce fait produites et éjectées par l’orifice de refoulement en même temps que le liquide.
PCT/JP2009/066854 2008-10-06 2009-09-18 Pompe génératrice de microbulles, aube de rotor pour pompe génératrice de microbulles et aube de stator pour pompe génératrice de microbulles WO2010041565A1 (fr)

Priority Applications (1)

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JP2010532876A JP5493153B2 (ja) 2008-10-06 2009-09-18 マイクロバブル発生ポンプ、マイクロバブル発生ポンプ用動翼およびマイクロバブル発生ポンプ用静翼

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JP2008-259722 2008-10-06
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JP2009166739 2009-07-15
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013034953A (ja) * 2011-08-09 2013-02-21 Univ Of Tsukuba スタティックミキサー
WO2014192896A1 (fr) * 2013-05-29 2014-12-04 株式会社アースリンク Procédé de production de micro-nano-bulles, générateur de micro-nano-bulles, et dispositif de production de micro-nano-bulles
JP6077627B1 (ja) * 2015-10-30 2017-02-08 昭義 毛利 ウルトラファインバブル発生用具
CN106523319A (zh) * 2016-11-29 2017-03-22 上海卫星装备研究所 一种超高热流密度控温用射流一体泵及其组装方法
GB2548074A (en) * 2016-01-11 2017-09-13 Belart Holding & Trade Gmbh Fluid mixer device and method
WO2022266721A1 (fr) * 2021-06-25 2022-12-29 Weir Minerals Australia Ltd Épaulement de rotor de pompe centrifuge à boue doté d'une lèvre
CN117627938A (zh) * 2024-01-25 2024-03-01 佛山市南海圣罗兰卫浴洁具有限公司 一种用于浴缸生成泡沫的水泵

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JP2013034953A (ja) * 2011-08-09 2013-02-21 Univ Of Tsukuba スタティックミキサー
WO2014192896A1 (fr) * 2013-05-29 2014-12-04 株式会社アースリンク Procédé de production de micro-nano-bulles, générateur de micro-nano-bulles, et dispositif de production de micro-nano-bulles
JP2014231046A (ja) * 2013-05-29 2014-12-11 株式会社アースリンク マイクロナノバブルの生成方法、マイクロナノバブル生成器及びマイクロナノバブル生成装置
JP6077627B1 (ja) * 2015-10-30 2017-02-08 昭義 毛利 ウルトラファインバブル発生用具
GB2548074A (en) * 2016-01-11 2017-09-13 Belart Holding & Trade Gmbh Fluid mixer device and method
GB2548074B (en) * 2016-01-11 2021-09-29 F B Fire Tech Ltd Fluid mixer device and method
CN106523319A (zh) * 2016-11-29 2017-03-22 上海卫星装备研究所 一种超高热流密度控温用射流一体泵及其组装方法
WO2022266721A1 (fr) * 2021-06-25 2022-12-29 Weir Minerals Australia Ltd Épaulement de rotor de pompe centrifuge à boue doté d'une lèvre
CN117627938A (zh) * 2024-01-25 2024-03-01 佛山市南海圣罗兰卫浴洁具有限公司 一种用于浴缸生成泡沫的水泵
CN117627938B (zh) * 2024-01-25 2024-04-02 佛山市南海圣罗兰卫浴洁具有限公司 一种用于浴缸生成泡沫的水泵

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