WO2012108008A1 - Diffuseur d'air à membrane - Google Patents

Diffuseur d'air à membrane Download PDF

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Publication number
WO2012108008A1
WO2012108008A1 PCT/JP2011/052685 JP2011052685W WO2012108008A1 WO 2012108008 A1 WO2012108008 A1 WO 2012108008A1 JP 2011052685 W JP2011052685 W JP 2011052685W WO 2012108008 A1 WO2012108008 A1 WO 2012108008A1
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WO
WIPO (PCT)
Prior art keywords
diffuser
air
membrane
pore
pore portion
Prior art date
Application number
PCT/JP2011/052685
Other languages
English (en)
Japanese (ja)
Inventor
久人 辻川
克行 保科
義雄 北川
Original Assignee
株式会社クボタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社クボタ filed Critical 株式会社クボタ
Priority to PCT/JP2011/052685 priority Critical patent/WO2012108008A1/fr
Priority to CN201180045608.0A priority patent/CN103118991B/zh
Publication of WO2012108008A1 publication Critical patent/WO2012108008A1/fr

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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
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B01F23/231243—Diffusers consisting of flexible porous or perforated material, e.g. fabric comprising foam-like gas outlets
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/201—Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
    • 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
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • B01F23/231231—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations
    • B01F23/231232—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations in the form of slits or cut-out openings
    • 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
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • 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
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B01F23/231241—Diffusers consisting of flexible porous or perforated material, e.g. fabric the outlets being in the form of perforations
    • B01F23/231242—Diffusers consisting of flexible porous or perforated material, e.g. fabric the outlets being in the form of perforations in the form of slits or cut-out openings
    • 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
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231262—Diffusers characterised by the shape of the diffuser element having disc shape
    • 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
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231264—Diffusers characterised by the shape of the diffuser element being in the form of plates, flat beams, flat membranes or films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0422—Numerical values of angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a membrane-type air diffuser installed in a tank of a sewage treatment facility or the like, and relates to a technique for performing air diffusion for biological treatment or stirring.
  • this type of membrane diffuser includes, for example, those shown in FIGS.
  • a rectangular diffuser membrane 252 is mounted on the upper surface of a rectangular base plate 251, and an air supply port 253 is provided at a predetermined position.
  • An air supply unit is provided between the base plate 251 and the diffuser membrane 252. 254 is formed.
  • the air supply port 253 communicates with the air supply unit 254.
  • the diffuser film 252 is a synthetic resin film or synthetic rubber film provided with a large number of slits 255 (pores), and the periphery of the diffuser film 252 is fixed to the base plate 251 by a fixing part 256.
  • Each slit 255 is a slit elongated in the longitudinal direction A of the diffuser membrane 252 and is parallel to the longitudinal direction A.
  • the aeration film 252 receives the water pressure in the tank and is pressed against the upper surface of the base plate 251. At this time, the diffuser membrane 252 does not expand and the slit 255 is closed.
  • the air diffusion film 252 receives the pressure of the compressed air from the longitudinal direction A. It expands into a mountain shape.
  • the slit 255 opens in the short direction B, and the air in the air supply unit 254 passes through the slit 255 and becomes a bubble 258, from the inner side to the outer side of the diffuser membrane 252. To erupt.
  • the slit 255 is used when the air supply amount supplied to the air supply unit 254 is small and the air volume is small. There is a problem that the bubbles generated from the bubbles and bubbles generated from the adjacent slits 255 are combined and coarsened, and the oxygen transfer efficiency is lowered.
  • the present invention can suppress an increase in the initial pressure loss and the pressure loss, and it is possible to prevent a decrease in oxygen transfer efficiency by dispersing bubbles uniformly when the air volume is small.
  • An object of the present invention is to provide a membrane diffuser capable of preventing the propagation of cracks.
  • a plurality of pores are formed in a diffuser membrane, At the time of air diffusion, the air diffuser film expands in a mountain shape by the pressure of the air supplied to the air diffuser film, and the pores open.
  • a membrane-type air diffuser that closes the pores when the air diffuser is not expanded when the air diffuser stops,
  • the diffuser membrane is formed by arranging a plurality of first pores and second pores that are more difficult to open than the first pores, A second pore portion is located between adjacent first pore portions.
  • the aeration membrane expands in a mountain shape due to the pressure of the air supplied to the aeration membrane, and a tensile force is generated in the aeration membrane.
  • This tensile force serves as a force for opening the first pore portion and the second pore portion.
  • the second pore portion is harder to open than the first pore portion, air is diffused with a small air volume.
  • the first pore portion is opened before the second pore portion, and most of the air supplied to the diffuser membrane passes through the opened first pore portion and becomes air bubbles from the inside of the diffuser membrane. While being ejected to the outside, there are hardly any bubbles ejected to the outside through the second pore part that is difficult to open.
  • the air supplied to the diffuser membrane passes through the first pore portion and the second pore portion, and is blown out from the inside of the diffuser membrane to the outside.
  • the bubbles are mainly ejected from the first pore portion.
  • the number of the second pore portions that eject the air bubbles increases, so that the initial pressure loss and the pressure loss increase. Can be suppressed.
  • the first air hole is a hole that is long in a predetermined direction of the air diffuser,
  • the direction in which the first pore part opens coincides with the direction of the tensile force generated in the diffuser film when the diffuser film expands in a mountain shape
  • the second pore portion is a hole that is long in a direction inclined with respect to the first pore portion.
  • the aeration membrane expands in a mountain shape due to the pressure of the air supplied to the aeration membrane, and a tensile force is generated in the aeration membrane.
  • This tensile force is a force for opening the first pore portion and the second pore portion.
  • the opening direction of the first pore portion coincides with the direction of the tensile force, but the second pore portion is Since it inclines with respect to the 1st pore part, the direction which the 2nd pore part opens, and the direction of tensile force do not correspond. Thereby, it becomes difficult for the 2nd pore part to open compared with the 1st pore part.
  • a plurality of pores are formed in the diffuser membrane, When diffused, the diffused film expands in a mountain shape when viewed from the longitudinal direction due to the pressure of the air supplied to the diffused film, and the pores open, A membrane-type air diffuser that closes the pores when the air diffuser is not expanded when the air diffuser stops, A plurality of first pore portions and second pore portions are respectively arranged in the longitudinal direction and the short direction of the diffuser membrane, The first pore portion is a long hole in the longitudinal direction of the diffuser membrane, The second pore portion is a long hole in a direction inclined with respect to the longitudinal direction of the diffuser membrane, A second pore portion is located between adjacent first pore portions.
  • the diffuser membrane expands in a mountain shape when viewed from the longitudinal direction due to the pressure of the air supplied to the diffuser membrane (that is, the cross-sectional shape orthogonal to the longitudinal direction of the diffuser membrane is a mountain shape) And a tensile force in the short direction is generated in the diffuser membrane.
  • This tensile force is a force for opening the first pore portion and the second pore portion.
  • the opening direction of the first pore portion coincides with the direction of the tensile force, but the second pore portion is Since it inclines with respect to the longitudinal direction, the direction in which the second pore portion opens and the direction of the tensile force do not match. Thereby, it becomes difficult for the 2nd pore part to open compared with the 1st pore part.
  • the first pore portion is opened before the second pore portion, and most of the air supplied to the diffuser membrane passes through the opened first pore portion, and bubbles
  • the air bubbles are ejected from the inside to the outside of the diffuser membrane, whereas there are almost no air bubbles ejected to the outside through the second pore portion that is difficult to open.
  • the air supplied to the diffuser membrane passes through the first pore portion and the second pore portion, and is blown out from the inside of the diffuser membrane to the outside.
  • the bubbles are mainly ejected from the first pore portion.
  • the number of the second pore portions that eject the air bubbles increases, so that the initial pressure loss and the pressure loss increase. Can be suppressed.
  • a plurality of pores are formed in the diffuser membrane, When air diffuses, the pores open when the air diffuser expands into a mountain shape due to the pressure of the air supplied to the air diffuser.
  • a membrane-type air diffuser that closes the pores when the air diffuser is not expanded when the air diffuser stops,
  • a plurality of first pore portions and second pore portions are arranged in concentric circles on the diffuser membrane, The first pore portion is a hole long in the circumferential direction of the diffuser membrane, The second pore portion is a hole long in a direction inclined with respect to the circumferential direction of the diffuser membrane, A second pore portion is located between adjacent first pore portions.
  • the aeration membrane expands in a mountain shape due to the pressure of the air supplied to the aeration membrane, and a tensile force is generated in the aeration membrane.
  • This tensile force is a force for opening the first pore portion and the second pore portion.
  • the opening direction of the first pore portion coincides with the direction of the tensile force, but the second pore portion is Since it inclines with respect to the 1st pore part, the direction which the 2nd pore part opens, and the direction of tensile force do not correspond. Thereby, it becomes difficult for the 2nd pore part to open compared with the 1st pore part.
  • the first pore portion is opened before the second pore portion, and most of the air supplied to the diffuser membrane passes through the opened first pore portion, and bubbles
  • the air bubbles are ejected from the inside to the outside of the diffuser membrane, whereas there are almost no air bubbles ejected to the outside through the second pore portion that is difficult to open.
  • the air supplied to the diffuser membrane passes through the first pore portion and the second pore portion, and is blown out from the inside of the diffuser membrane to the outside.
  • the bubbles are mainly ejected from the first pore portion.
  • the number of the second pore portions that eject the air bubbles increases, so that the initial pressure loss and the pressure loss increase. Can be suppressed.
  • the second pore portion is a long hole in a direction inclined at an angle of 5 ° to 25 ° with respect to the first pore portion.
  • the membrane type air diffuser has a third pore portion formed adjacent to at least one of the longitudinal direction of the first pore portion or the second pore portion,
  • the third pore portion is a hole that is long in a direction substantially perpendicular to the first pore portion.
  • the membrane-type air diffuser in the seventh invention is formed by arranging a plurality of first and third pore portions in the air diffuser film, At the time of air diffusion, the first pore part is opened by the air diffusion film expanding in a mountain shape by the pressure of the air supplied to the air diffusion film, When the aeration is stopped, the first pore portion is closed in a state where the aeration film is not expanded, The third pore portion is formed at a position adjacent to at least one of the longitudinal directions of the first pore portion, The third pore portion is a hole that is long in the direction intersecting the first pore portion.
  • the air diffusion film expands in a mountain shape by the pressure of the air supplied to the air diffusion film, and the first pore portion is opened by the tensile force generated in the air diffusion film.
  • the supplied air passes through the first pore portion, becomes a bubble, and is ejected from the inside to the outside of the diffuser membrane.
  • the third pore portion is a hole that is long in a direction intersecting the first pore portion, even if a crack occurs at the end portion of the first pore portion due to the tensile force, When reaching the third pore portion from the end portion of the pore portion, it does not proceed further from there. Therefore, the crack can be prevented from propagating from the first pore portion to the adjacent first pore portion.
  • the supply of air to the aeration film is interrupted, the aeration film does not expand, and the first and second pores are closed.
  • the third pore portion is a hole that is long in a direction substantially perpendicular to the first pore portion.
  • the first pore portion is opened, and the supplied air passes through the first pore portion and becomes a bubble to be ejected from the inside of the diffuser membrane to the outside.
  • the third pore portion is a hole that is long in a direction substantially orthogonal to the first pore portion, even if a crack occurs at the end portion of the first pore portion, this crack is not generated in the first pore portion.
  • this crack is not generated in the first pore portion.
  • the third pore portion is closed, and there are almost no bubbles ejected to the outside through the third pore portion.
  • the membrane diffuser in the ninth invention is formed by arranging a plurality of first and third pores on the diffuser membrane,
  • the first pore portion is a long hole in the longitudinal direction of the diffuser membrane
  • the third pore portion is a hole that is long in the short direction of the diffuser membrane, and is formed at a position adjacent to at least one of the first pore portions in the longitudinal direction of the diffuser membrane,
  • the air diffusion film expands in a mountain shape by the pressure of the air supplied to the air diffusion film, and the first pore portion opens in the short direction,
  • the first pore portion is closed in a state where the aeration film is not expanded.
  • the air diffuser film expands in a mountain shape due to the pressure of the air supplied to the air diffuser film, and the first pore portion is short in the short direction due to the short direction tensile force generated in the air diffuser film. Open to. The supplied air passes through the first pore portion, becomes a bubble, and is ejected from the inside to the outside of the diffuser membrane.
  • the second pore portion is closed, and there are almost no bubbles ejected to the outside through the second pore portion.
  • the supply of air to the aeration film is interrupted, the aeration film does not expand, and the first and second pores are closed.
  • the membrane-type air diffuser in the tenth aspect of the present invention is formed by arranging a plurality of first and third pore portions concentrically on the air diffuser membrane,
  • the first pore portion is a hole long in the circumferential direction of the diffuser membrane
  • the third pore portion is a hole that is long in the radial direction of the diffuser membrane, and is formed at a position adjacent to at least one of the first pore portions in the circumferential direction of the diffuser membrane,
  • the air diffusion film expands in a mountain shape by the pressure of the air supplied to the air diffusion film, and the first pore portion opens in the radial direction,
  • the first pore portion is closed in a state where the aeration film is not expanded.
  • the air diffusion film expands in a mountain shape by the pressure of the air supplied to the air diffusion film, and the first pore portion opens in the radial direction by the radial tensile force generated in the air diffusion film. .
  • the supplied air passes through the first pore portion, becomes a bubble, and is ejected from the inside to the outside of the diffuser membrane.
  • the crack can be prevented from propagating from the first pore portion to the adjacent first pore portion in the circumferential direction of the diffuser membrane.
  • the third pore portion is closed, and there are almost no bubbles ejected to the outside through the third pore portion.
  • the supply of air to the aeration film is cut off, the aeration film does not expand, and the first and third pores are closed.
  • the membrane-type air diffuser according to the eleventh aspect of the present invention is such that a plurality of second pore portions that are long in the direction inclined at an angle of 5 ° to 25 ° with respect to the first pore portion are formed on the diffuser membrane.
  • the air diffuser film expands in a mountain shape due to the pressure of the air supplied to the air diffuser film, and the tensile force generated in the air diffuser film leads to the second pore part.
  • the first pore portion opens.
  • the supplied air passes through the opened first pore portion and becomes a bubble and is ejected from the inside to the outside of the diffuser membrane, whereas the bubble that is ejected to the outside through the second pore portion that is difficult to open There is almost no.
  • the second pore portion is easily opened as the air supply amount is increased, and the number of the second pore portions ejecting bubbles is increased. For this reason, the air supplied to the diffuser membrane passes through the first pore portion and the second pore portion, and is blown out from the inside of the diffuser membrane to the outside.
  • the bubbles are mainly ejected from the first pore portion.
  • the number of the second pore portions that eject the air bubbles increases, so that the initial pressure loss and the pressure loss increase. Can be suppressed.
  • the present invention it is possible to suppress an increase in the initial pressure loss and the pressure loss, and it is possible to prevent a decrease in oxygen transfer efficiency by dispersing and generating bubbles uniformly when the air volume is small. Is possible. Moreover, propagation of cracks can be prevented.
  • FIG. 2 is an SS arrow view in FIG. 1 and shows a state during an aeration operation. It is a top view which shows the arrangement pattern of the slit of a membrane type air diffuser.
  • FIG. 4 is an enlarged plan view of the slit of the membrane-type air diffuser, where (a) shows a state in which the first to third slits are closed, and (b) shows a state in which the first and second slits are opened and the third slit is closed. It shows the state.
  • FIG. 4 is an enlarged plan view of the slit of the membrane-type air diffuser, where (a) shows a state in which the first to third slits are closed, and (b) shows a state in which the first and second slits are opened and the third slit is closed. It shows the state.
  • FIG 3 is an enlarged cross-sectional view of the first and second slits of the membrane-type air diffuser, in which (a) is a state where the first and second slits are closed, and (b) is a state where the first slit is opened and the second slit is opened. (C) shows a state in which the first and second slits are open. It is a figure for demonstrating the general relational expression of the maximum stress which generate
  • the graph (a) shows the relationship between the membrane surface ventilation rate and the number of foam slits
  • the graph (b) shows the membrane surface ventilation rate and the ratio of the first to third slits in all the foam slits. This shows the relationship. It is a graph which shows the relationship between the inclination-angle of a 2nd slit, and the ratio of the number of the 2nd slit to foam when the number of the 1st slit to foam is set to 100.
  • FIG. FIG. 5 is a plan view showing an arrangement pattern in which slit directions are arranged at random, which is in proportion to the first embodiment. It is a top view which shows the arrangement pattern of the slit of the membrane type air diffuser in the 2nd Embodiment of this invention.
  • FIG. 14 is an SS arrow view in FIG. 13. It is a top view which shows the arrangement pattern of the slit of a membrane type air diffuser. It is a top view of the membrane type air diffuser in the 6th Embodiment of this invention.
  • FIG. 17 is an SS arrow view in FIG. 16.
  • FIG. 19 is a view taken along the line SS in FIG. 18 and shows a state during the aeration operation. It is a top view which shows the arrangement pattern of the slit of a membrane type air diffuser.
  • FIG. 4 is an enlarged plan view of the slit of the membrane diffuser, where (a) shows a state where the first and third slits are closed, and (b) shows a state where the first slit is open and the third slit is closed. Indicates.
  • FIG. 1 It is an expanded sectional view of the 1st slit of a membrane type diffuser, (a) shows the state where the 1st slit is closed, and (b) shows the state where the 1st slit is opened. It is a figure for demonstrating the general relational expression of the maximum stress which generate
  • FIG. 4 is an enlarged plan view of the slit of the membrane-type air diffuser, where (a) shows a state in which the first to third slits are closed, and (b) shows a state in which the first and second slits are opened and the third slit is closed. It shows the state.
  • the graph (a) shows the relationship between the membrane surface ventilation rate and the number of foam slits, and the graph (b) shows the membrane surface ventilation rate and the ratio of the first to third slits in all the foam slits. This shows the relationship.
  • FIG. 29 is an SS arrow view in FIG. 28. It is a top view which shows the arrangement pattern of the slit of a membrane type air diffuser. It is a top view of the membrane type air diffusion apparatus in the 10th Embodiment of this invention.
  • FIG. 32 is an SS arrow view in FIG. 31. It is a perspective view of the conventional membrane type diffuser.
  • reference numeral 1 denotes a membrane-type air diffuser installed in an aeration tank such as a sewage treatment facility.
  • the membrane diffuser 1 includes a rectangular base plate 2 made of plastic or metal, and a rectangular (an example of a shape that is long in one direction) attached to the upper surface of the base plate 2.
  • the air diffusion membrane 3 has elasticity, and is made of, for example, rubber such as EPDM or silicon, or resin such as polyurethane.
  • the periphery of the diffuser membrane 3 is fixed to the base plate 2 by a fixing portion 6 (for example, a caulking member), and an air supply portion 4 is formed between the base plate 2 and the diffuser membrane 3. Further, a short cylindrical air supply port 5 is provided at one end portion in the longitudinal direction A (an example of a predetermined direction) of the diffuser membrane 3. The air supply port 5 communicates with the air supply unit 4 and is connected to an air supply source (not shown).
  • the diffuser membrane 3 may have, for example, the following properties (1) to (3). * Properties (1) Material: Rubber (EPDM), Hardness (A): 50-70, Thickness (mm): 1-3 * Properties (2) Material: Rubber (silicon), Hardness (A): 35-55, Thickness (mm): 1-3 * Properties (3) Material: Resin (Polyurethane), Hardness (A): 70-98, Thickness (mm): 0.3-1
  • Properties of the air diffusing membrane 3 are examples, and are not limited to these, and can be appropriately changed and optimized according to the conditions to be used.
  • the air diffusion film 3 expands in a mountain shape when viewed from the longitudinal direction A by the pressure of the air supplied to the air diffusion film 3.
  • the diffuser membrane 3 does not have a mountain shape when viewed from the longitudinal direction A, but most regions excluding both ends of the diffuser membrane 3. Since the diffuser membrane 3 expands in a mountain shape when viewed from the longitudinal direction A, the two ends of the diffuser membrane 3 are excluded here.
  • a plurality of first to third slits 8 to 10 are formed in the diffuser membrane 3.
  • the first slit 8 is an elongated hole (slit) in the longitudinal direction A, and is parallel to the longitudinal direction A.
  • the second slit 9 is an elongated hole (slit) in a direction inclined at a predetermined inclination angle ⁇ with respect to the longitudinal direction A (that is, the first slit 8).
  • the predetermined inclination angle ⁇ is set to 13 ° (acute angle).
  • the third slit 10 is a hole (slit) elongated in the short direction B and is orthogonal to the longitudinal direction A (that is, the first slit 8).
  • the first to third slits 8 to 10 are arranged in a predetermined arrangement pattern in the longitudinal direction A and the short direction B. That is, a plurality of first slits 8 are formed at predetermined intervals in the longitudinal direction A, and the second slits 9 are located between the first slits 8 adjacent in the longitudinal direction A. Further, the third slit 10 is located between the first slit 8 and the second slit 9 adjacent in the longitudinal direction A, and is located between the first slits 8 adjacent in the longitudinal direction A, As a result, the first slit 8 and the second slit 9 are adjacent to each other. The second slit 9 is also located between the first slits 8 adjacent in the short direction B.
  • air of a predetermined pressure is supplied from the air supply source (not shown) through the air supply port 5 to the membrane-type air diffuser 1, so that air is supplied from the air supply port 5 as shown by the solid line in FIG.
  • the diffuser membrane 3 expands in a mountain shape when viewed from the longitudinal direction A by the pressure of air supplied to the supply unit 4, and a tensile force F in the short direction B is generated in the diffuser membrane 3.
  • the tensile force F is a force for opening the first slit 8 and the second slit 9.
  • the direction in which the first slit 8 opens and the direction of the tensile force F coincide with each other.
  • the second slit 9 is inclined at the inclination angle ⁇ , the direction in which the second slit 9 opens and the direction of the tensile force F do not match. That is, the first slit 8 is opened by the tensile force F, while the second slit 9 is opened by the Fcos ⁇ force F ′, which is smaller than the tensile force F. For this reason, the second slit 9 becomes harder to open than the first slit 8 as the inclination angle ⁇ increases.
  • the first slit 8 opens before the second slit 9, and most of the air supplied to the air supply unit 4 is While passing through the opened first slit 8 and forming bubbles 13 from the inside of the diffuser membrane 3 to the outside, almost no bubbles are ejected to the outside through the second slit 9 that is difficult to open.
  • the air pressure of the air supply unit 4 increases as the amount of air supplied to the air supply unit 4 increases, and the second slit 9 It becomes easy to open, and the number of the second slits 9 for ejecting bubbles increases. For this reason, as shown in FIG.5 (c), the air of the air supply part 4 passes the 1st slit 8 and the 2nd slit 9, becomes the bubble 13, and is ejected from the inner side of the diffuser film 3 to the outer side.
  • the bubbles 13 are mainly ejected from the first slit 8, but as the air volume increases, the number of the second slits 9 that eject the air bubbles 13 increases, so that the initial pressure loss and pressure loss are increased. Can be suppressed.
  • the first slit 8 when the air is diffused, the first slit 8 is opened by the tensile force F in the short direction B acting on the first slit 8, and the first slit 8 is opened by this tensile force F. Even if a crack 12 occurs at the end of the first slit, the crack 12 does not advance further from the end of the first slit 8 until it reaches the third slit 10. Therefore, the crack 12 can be prevented from propagating from the first slit 8 to the adjacent first slit 8 in the longitudinal direction A.
  • the maximum stress ⁇ max increases as the radius ⁇ at the tip of the notch 15 decreases.
  • the radius ⁇ at the tip is very small, so that the crack 12 gradually grows due to the stress concentration.
  • the third slit 10 has a notch with a very large radius ⁇ at the tip. Can be considered.
  • the maximum stress ⁇ max obtained by the above formula becomes very small, and the stress concentration hardly occurs in the third slit 10, thereby preventing the propagation of the crack 12 in the third slit 10.
  • the third slit 10 is closed. There is almost no air jetted from the air supply unit 4 through the third slit 10 to the outside.
  • the supply of air to the aeration film 3 is interrupted, and the aeration film 3 receives water pressure as shown in the phantom line of FIG. 2 and FIG. It will be in the state pressed against. At this time, the diffuser membrane 3 does not expand, and the first to third slits 8 to 10 are closed.
  • the graph of FIG. 7 is an example of measurement data of the number of foam slits by air volume, and among these, the graph of FIG. 7A shows the relationship between the membrane surface ventilation rate and the number of foam slits.
  • the graph of FIG. 7B shows the relationship between the membrane surface air flow rate and the ratio of the first to third slits 8 to 10 occupying in all the foaming slits.
  • the membrane surface air flow rate indicates the air flow rate of air passing through the diffuser membrane 3 per hour and per m 2, and from the membrane surface air flow rate M1 to the membrane surface air flow rate M4. It has increased to become. It should be noted that the smaller the amount of air supplied to the membrane-type air diffuser 1, the smaller the air flow rate on the membrane surface, and the greater the air flow rate, the greater the air flow rate on the membrane surface.
  • the number of foam slits is the number of first slits 8 that ejected bubbles from among the 100 first slits 8 and the number of second slits 9 that ejected bubbles from among the 100 second slits 9.
  • the number and the number of the third slits 10 from which the bubbles are jetted out of the 100 third slits 10 are shown.
  • the ratio occupied in all the foam slits is the first to the second of the total number of foam slits for each membrane surface air flow rate M1 to M4 in the graph of FIG. 7 (a).
  • the ratio of the three slits 8 to 10 is shown.
  • the diffuser membrane 3 at this time is made of polyurethane resin (hardness 85A) and has a thickness of 0.6 mm, and the lengths of the first to third slits 8 to 10 are about 0.4 mm.
  • the inclination angle ⁇ of the second slit 9 is set to the optimum value of 13 ° based on the relationship shown in the graph of FIG. 8, it is not limited to 13 ° but is in the range of 5 ° to 25 °. An angle of 10 ° to 15 ° is more preferable.
  • FIG. 9 shows an example of the diffuser membrane 3 in which the orientations of the slits 18 are randomly arranged.
  • the smaller the inclination angle ⁇ with respect to the longitudinal direction A the easier the slit 15 opens.
  • the ratio of the slits 15 having the small inclination angle ⁇ decreases, there is a problem that the pressure loss increases.
  • the air is foamed from the slit 15 having a larger inclination angle ⁇ , which increases the pressure loss.
  • the third slit 10 is formed at the most effective angle of 90 ° with respect to the longitudinal direction A, but it is about 70 ° to 110 °. You may form in the angle within the range.
  • two types of second slits 9 and 11 (an example of the second pore portion) having different inclination angles ⁇ between the first slits 8 adjacent in the longitudinal direction A. ) May be formed.
  • the inclination angle ⁇ of one second slit 9 is set to 13 °
  • the inclination angle ⁇ of the other second slit 11 is set to 6 °.
  • one second slit 9 is harder to open than the other second slit 11, and the other second slit 11 is harder to open than the first slit 8. Therefore, when the air is diffused with a small air volume, the first slit 8 is opened before the second slits 9 and 11, and most of the air supplied to the air supply unit 4 passes through the opened first slit 8. Erupted through. Further, when the air volume is increased from the small air volume to the large air volume, the other second slit 11 is easily opened after the first slit 8, and the number of the other second slits 11 ejecting bubbles is increased. Then, when the air volume further increases, one of the second slits 9 is easily opened, and the number of one of the second slits 9 for ejecting bubbles increases.
  • the inclination angle ⁇ of the other second slit 11 is set to 6 °, but is not limited to 6 ° and is set to an angle in the range of 5 ° to 20 °. May be.
  • the shapes of the base plate 2 and the diffuser membrane 3 are rectangular. However, the shape is not limited to the rectangle, and the fifth embodiment. As shown in FIGS. 13 to 15, the shape of the base plate 2 and the diffuser membrane 3 may be circular.
  • the short tubular air supply port 5 is provided at the center of the base plate 2, the upper end of the air supply port 5 communicates with the air supply unit 4, and the lower end of the air supply port 5 is connected to the air supply tube 21 and communicates therewith. ing.
  • the air diffusion film 3 expands in a mountain shape when viewed from the radial direction R by the pressure of the air supplied to the air diffusion film 3.
  • a plurality of first to third slits 8 to 10 are formed in the diffuser membrane 3.
  • the first slit 8 is a hole (slit) elongated in the circumferential direction C of the diffuser membrane 3.
  • the second slit 9 is a hole (slit) elongated in a direction inclined at a predetermined inclination angle ⁇ with respect to the circumferential direction C (that is, the first slit 8).
  • the predetermined inclination angle ⁇ is set to 13 ° (acute angle).
  • the third slit 10 is a hole (slit) elongated in the radial direction R of the diffuser membrane 3 and is orthogonal to the circumferential direction C.
  • the first to third slits 8 to 10 are arranged in a plurality of concentric circles in a predetermined arrangement pattern. That is, a plurality of first slits 8 are formed at predetermined intervals in the circumferential direction C, and the second slits 9 are located between the first slits 8 adjacent in the circumferential direction C. Further, the third slit 10 is located between the first slit 8 and the second slit 9 adjacent in the circumferential direction C, and is positioned between the first slits 8 adjacent in the circumferential direction C. Yes.
  • air of a predetermined pressure is supplied from the air supply pipe 21 through the air supply port 5 to the membrane-type air diffuser 1, so that the air supply port 5 supplies the air supply unit 4 as shown by the solid line in FIG. 14.
  • the diffuser membrane 3 expands in a mountain shape when viewed from the radial direction R by the pressure of the supplied air, and a tensile force F in the radial direction R is generated in the diffuser membrane 3.
  • the tensile force F is a force for opening the first slit 8 and the second slit 9.
  • the direction in which the first slit 8 opens coincides with the direction of the tensile force F.
  • the second slit 9 is inclined at an inclination angle ⁇ , the direction in which the second slit 9 opens and the direction of the tensile force F do not match.
  • the second slit 9 becomes harder to open than the first slit 8 as the inclination angle ⁇ increases.
  • the first slit 8 is opened before the second slit 9, and most of the air supplied to the air supply unit 4 passes through the opened first slit 8, While it becomes a bubble and is ejected from the inside of the diffuser film 3 to the outside, there are almost no bubbles that are ejected to the outside through the second slit 9 that is difficult to open.
  • the air pressure of the air supply unit 4 increases as the amount of air supplied to the air supply unit 4 increases, and the second slit 9 It becomes easy to open, and the number of the second slits 9 for ejecting bubbles increases. For this reason, the air of the air supply part 4 passes the 1st slit 8 and the 2nd slit 9, becomes a bubble, and is ejected from the inner side of the diffuser film 3 to the outer side.
  • the first slit 8 is opened by the tensile force F in the radial direction R acting on the first slit 8, but even if a crack 12 occurs at the end of the first slit 8 due to this tensile force F.
  • the crack 12 reaches the third slit 10 from the end of the first slit 8, the crack 12 does not advance further from there. Therefore, the crack 12 can be prevented from propagating from the first slit 8 to the adjacent first slit 8 in the circumferential direction C.
  • the aeration film 3 receives a water pressure and is pressed against the upper surface of the base plate 2. At this time, the diffuser membrane 3 does not expand, and the first to third slits 8 to 10 are closed.
  • the shape of the base plate 2 and the diffuser membrane 3 is circular, but it may be a regular polygon such as a square.
  • the membrane diffuser 1 is provided with the diffuser film 3 on the upper surface of the base plate 2.
  • a rectangular diffuser film 3 may be provided on the upper surface of the rectangular bag 25.
  • the bag-like body 25 is made of an air-impermeable sheet-like member and has an air supply part 4 inside.
  • An air supply port 5 is provided on one outer edge of the bag-like body 25. The air supply port 5 communicates with the air supply unit 4 and is connected to an air supply source (not shown).
  • the diffuser film 3 is attached to the diffuser opening 26 formed on the upper surface of the bag 25 and covers the diffuser opening 26. As in the first embodiment, a large number of first to third slits 8 to 10 are formed in the diffuser membrane 3. At the time of air diffusion, as shown by the solid line in FIG. 17, the air diffusion film 3 is mountain-shaped when viewed from the longitudinal direction A due to the pressure of air supplied from the air supply port 5 to the air supply unit 4 in the bag-like body 25. Inflates.
  • the bag 25 and the diffuser membrane 3 are rectangular, but may be circular.
  • the slit arrangement pattern in the longitudinal direction A is set to “X, Z, Y, Z, X, Z, Y, Z, X.
  • the arrangement pattern of the slits in the circumferential direction C is “X ⁇ Z ⁇ Y ⁇ Z ⁇ X ⁇ Z ⁇ Y ⁇ Z ⁇ X.
  • the present invention is not limited to this arrangement pattern.
  • Pattern (1) X, Y, X, Y, X, Y, X ...
  • Pattern (2) X, X, Y, X, X, Y, X, X, Y, X ...
  • Pattern (3) X, Y, Y ', X, Y, Y', X, Y, Y ', X ...
  • Pattern (4) X, Y, X, Y ', X, Y, X, Y', X ...
  • the slits 8 to 11 are exaggerated and enlarged as compared with actual ones for easy understanding, but in actuality, the slits 8 to 11 have a minute size.
  • the length of each of the slits 8 to 11 is preferably set in the range of 0.2 mm to 1 mm, more preferably in the range of 0.4 mm to 0.6 mm.
  • the actual number of slits 8 to 11 is larger than the number depicted in FIGS.
  • the first slit 8 and the second slit 9 may have the same length or different lengths.
  • the first slit 8 is parallel to the longitudinal direction A.
  • the first slit 8 may be slightly inclined with respect to the longitudinal direction A.
  • the second slit 9 can be set to be more difficult to open than the first slit 8.
  • an embodiment in which the first slit 8 is inclined by 3 ° with respect to the longitudinal direction A and the second slit 9 is inclined by 15 ° with respect to the longitudinal direction A can be considered.
  • these can be suitably adjusted according to the material of the diffuser film 3, and the length of a slit.
  • the second slit 9 is more difficult to open than the first slit 8 by providing an angle between the first slit 8 and the second slit 9.
  • the second slit 9 can be set to be more difficult to open than the first slit 8.
  • the second slit 9 is set to be harder to open than the first slit 8.
  • the diffuser membrane 3 has a rectangular or circular shape.
  • an elliptical shape an elliptical shape in which both ends are formed in an arc shape, an L shape, A square shape, a rhombus shape, etc. may be sufficient.
  • 101 is a membrane type air diffuser installed in an aeration tank such as a sewage treatment facility.
  • This membrane-type air diffuser 101 includes a rectangular base plate 102 made of plastic, metal, or the like, and a rectangular air diffuser membrane 103 attached to the upper surface of the base plate 102.
  • the air diffusion membrane 103 has elasticity, and is made of, for example, rubber such as EPDM or silicon, or resin such as polyurethane.
  • the periphery of the diffuser membrane 103 is fixed to the base plate 102 by a fixing unit 106 (for example, a caulking member), and an air supply unit 104 is formed between the base plate 102 and the diffuser membrane 103. Further, a short cylindrical air supply port 105 is provided at one end in the longitudinal direction A of the diffuser membrane 103. The air supply port 105 communicates with the air supply unit 104 and is connected to an air supply source (not shown).
  • a fixing unit 106 for example, a caulking member
  • the diffuser membrane 103 for example, the following properties (1) to (3) can be used.
  • the properties of the air diffusing membrane 103 are examples, and are not limited to these, and can be appropriately changed and optimized according to the conditions to be used.
  • the air diffusion film 103 expands in a mountain shape when viewed from the longitudinal direction A due to the pressure of the air supplied to the air diffusion film 103.
  • both ends in the longitudinal direction A of the diffuser membrane 103 are fixed to the base plate 102, it does not have a mountain shape when viewed from the longitudinal direction A, but most regions excluding both ends of the diffuser membrane 103. Since the diffuser membrane 103 expands in a mountain shape when viewed from the longitudinal direction A, the two ends of the diffuser membrane 103 are excluded here.
  • first and third slits 108 and 109 are formed in the diffuser membrane 103.
  • the first slit 108 is an elongated hole (slit) in the longitudinal direction A, and is parallel to the longitudinal direction A.
  • the third slit 109 is a hole (slit) that is elongated in the lateral direction B, and is orthogonal to the longitudinal direction A.
  • a plurality of first and third slits 108 and 109 are arranged in a predetermined arrangement pattern in the longitudinal direction A and the transverse direction B. That is, a plurality of the first slits 108 are formed at predetermined intervals in the longitudinal direction A, and the third slits are disposed between the first slits 108 adjacent in the longitudinal direction A (an example of positions adjacent to at least one of the first slits 108). A slit 109 is located. In addition, a plurality of first slits 108 are formed at predetermined intervals also in the short direction B, and the third slits 109 are located between adjacent first slits 108 in the short direction B.
  • air of a predetermined pressure is supplied from the air supply source (not shown) through the air supply port 105 to the membrane type air diffuser 101 so that the air is supplied from the air supply port 105 as shown by the solid line in FIG.
  • the diffuser membrane 103 expands in a mountain shape when viewed from the longitudinal direction A due to the pressure of the air supplied to the supply unit 104, and a tensile force F in the short direction B is generated in the diffuser membrane 103.
  • the first slit 108 is opened in the short direction B by the tensile force F.
  • the air supplied to the air supply unit 104 passes through the first slit 108, becomes a bubble 113, and is ejected from the inside of the diffuser membrane 103 to the outside.
  • the maximum stress ⁇ max increases as the radius ⁇ at the tip of the notch 115 decreases.
  • the radius ⁇ at the tip is very small, and the crack 112 gradually grows due to the stress concentration.
  • the maximum stress ⁇ max obtained by the above formula becomes very small, and the stress concentration hardly occurs in the third slit 109, whereby the propagation of the crack 112 in the third slit 109 can be prevented.
  • the diffuser film 103 that expands in a mountain shape mainly generates a tensile force F in the short direction B and hardly generates a force in the longitudinal direction A.
  • the third slit 109 remains closed, and almost no air is ejected from the air supply unit 104 through the third slit 109 to the outside.
  • the aeration film 103 receives water pressure and is pressed against the upper surface of the base plate 102. Become. At this time, the diffuser membrane 103 does not expand, and the first and second slits 8 and 9 are closed.
  • the diffuser membrane 103 has a predetermined inclination angle ⁇ with respect to the longitudinal direction A in addition to the first and third slits 108 and 109.
  • a plurality of second slits 110 (an example of a second pore portion) that are elongated holes are formed in the direction inclined at.
  • the predetermined inclination angle ⁇ is set to 13 ° (acute angle).
  • the second slit 110 is located between the first slits 108 adjacent in the longitudinal direction A.
  • the third slit 109 is located between the first slit 108 and the second slit 110 adjacent in the longitudinal direction A, and is located between the first slits 108 adjacent in the longitudinal direction A.
  • the tensile force F in the short direction B generated in the diffuser film 103 that has expanded in a mountain shape serves as a force for opening the first slit 108 and the second slit 110.
  • the direction in which the first slit 108 opens coincides with the direction of the tensile force F.
  • the second slit 110 is inclined at the inclination angle ⁇ , the direction in which the second slit 110 opens and the tensile force F Does not match the direction. That is, the first slit 108 is opened with the tensile force F, while the second slit 110 is opened with the force F ′ of Fcos ⁇ , which is smaller than the tensile force F. For this reason, as the inclination angle ⁇ increases, the second slit 110 becomes harder to open than the first slit 108.
  • the second slit 110 is located between the adjacent first slits 108, the interval D between the first slits 108 is enlarged, and the bubbles ejected from the first slit 108 and the neighboring first slits 108 are increased. Bonding with the ejected bubbles can be prevented. Thereby, at the time of a small air volume, bubbles can be dispersed and generated uniformly, and a decrease in oxygen transfer efficiency can be prevented.
  • the air supply of the air supply unit 104 increases as the amount of air supplied to the air supply unit 104 increases, and the second slit 110 It becomes easy to open, and the number of the second slits 110 for ejecting bubbles increases.
  • the air of the air supply part 104 passes through the 1st slit 108 and the 2nd slit 110, and is ejected from the inner side of the diffuser film 103 to the outer side as a bubble.
  • the bubbles are mainly ejected from the first slit 108 at a small air volume.
  • the number of the second slits 110 that eject the air bubbles increases. The rise can be suppressed.
  • the graph of FIG. 26 is an example of measurement data of the number of foam slits by air volume, and among these, the graph of FIG. 26A shows the relationship between the membrane surface air flow rate and the number of foam slits.
  • the graph of FIG. 26 (b) shows the relationship between the air flow rate on the membrane surface and the ratio of the first to third slits 108 to 110 in the total foaming slits.
  • the membrane surface ventilation rate indicates the ventilation rate of air passing through the diffuser membrane 103 per hour and per 1 m 2, and from the membrane surface ventilation rate M1 to the membrane surface ventilation rate M4. It has increased to become. It should be noted that the smaller the amount of air supplied to the membrane type air diffuser 101, the smaller the air flow rate on the membrane surface, and the greater the air volume, the greater the air flow rate on the membrane surface.
  • the number of foam slits is the number of first slits 108 that ejected bubbles from among the 100 first slits 108 and the number of third slits 109 that ejected bubbles from among the 100 third slits 109.
  • the number and the number of second slits 110 from which bubbles are ejected out of 100 second slits 110 are shown.
  • the ratio occupied in all the foaming slits is the first to the second of the total number of foaming slits for each membrane surface air flow rate M1 to M4 in the graph of FIG.
  • the ratio occupied by the three slits 108 to 110 is shown.
  • the diffuser membrane 103 at this time is made of polyurethane resin (hardness 85A) and has a thickness of 0.6 mm, and the lengths of the first to third slits 108 to 110 are about 0.4 mm.
  • the inclination angle ⁇ of the second slit 110 is set to the optimum value of 13 ° based on the relationship shown in the graph of FIG. 27, but is not limited to 13 ° and is in the range of 5 ° to 25 °. An angle of 10 ° to 15 ° is more preferable.
  • the third slit 109 is formed at the most effective angle of 90 ° with respect to the longitudinal direction A, but it is within the range of about 70 ° to 110 °. You may form at an angle.
  • the first slit 108 is parallel to the longitudinal direction A.
  • the first slit 108 may be slightly inclined with respect to the longitudinal direction A.
  • the shapes of the base plate 102 and the diffuser membrane 103 are rectangular. However, the shape is not limited to a rectangle, and FIGS. 28 to 30 show the ninth embodiment. As shown, the shape of the base plate 102 and the diffuser membrane 103 may be circular.
  • the short tubular air supply port 105 is provided at the center of the base plate 102, the upper end of the air supply port 105 communicates with the air supply unit 104, and the lower end of the air supply port 105 communicates with the air supply tube 121. ing.
  • first and third slits 108 and 109 are formed concentrically on the diffuser membrane 103.
  • first slit 108 is a hole (slit) elongated in the circumferential direction C of the diffuser membrane 103.
  • the third slit 109 is a hole (slit) elongated in the radial direction R of the diffuser membrane 103 and is orthogonal to the circumferential direction C.
  • a plurality of first and third slits 108 and 109 are arranged in a predetermined arrangement pattern in the circumferential direction C and the radial direction R.
  • a plurality of first slits 108 are formed at predetermined intervals in the circumferential direction C, and between the first slits 108 adjacent in the circumferential direction C (an example of a position adjacent to at least one of the first slits 108).
  • a third slit 109 is located.
  • the air diffusion film 103 is mountain-shaped when viewed from the radial direction R due to the pressure of air supplied from the air supply pipe 121 through the air supply port 105 to the air supply unit 104.
  • the tensile force F in the radial direction R is generated in the diffuser membrane 103, and the first slit 108 is opened in the radial direction R by the tensile force F.
  • the air supplied to the air supply unit 104 passes through the first slit 108 and becomes a bubble, and is ejected from the inside of the diffuser membrane 103 to the outside.
  • the third slit 109 is closed. There is almost no air jetted from the air supply unit 104 to the outside through the third slit 109.
  • the supply of air to the aeration film 103 is interrupted, and the aeration film 103 is pressed against the upper surface of the base plate 102 under water pressure. At this time, the diffuser membrane 103 does not expand, and the first and third slits 108 and 109 are closed.
  • the first and third slits 108 and 109 are formed in the diffuser membrane 103.
  • the first to third slits 108 to 110 may be formed.
  • bubbles can be dispersed and uniformly generated when the air volume is small, and it is possible to prevent a decrease in oxygen transfer efficiency. An increase in pressure loss and initial pressure loss can be suppressed.
  • the shape of the base plate 102 and the diffuser membrane 103 is circular, but it may be a regular polygon such as a square.
  • the membrane diffuser 101 is provided with the diffuser film 103 on the upper surface of the base plate 102.
  • a rectangular diffuser film 103 may be provided on the upper surface of the rectangular bag-shaped body 125.
  • the bag-like body 125 is made of an air-impermeable sheet-like member and has an air supply unit 104 inside.
  • An air supply port 105 is provided on one outer edge of the bag-like body 125, and the air supply port 105 communicates with the air supply unit 104 and is connected to an air supply source (not shown).
  • the diffuser membrane 103 is attached to the diffuser opening 126 formed on the upper surface of the bag-like body 125 and covers the diffuser opening 126.
  • the diffuser membrane 103 is formed with first and third slits 108 and 109.
  • the air diffusion film 103 is mountain-shaped when viewed from the longitudinal direction A due to the pressure of the air supplied from the air supply port 105 to the air supply unit 104 in the bag-like body 125. Inflates.
  • the bag-like body 125 and the diffuser membrane 103 are rectangular, but they may be circular.
  • first to third slits 108 to 110 similar to those in the eighth embodiment may be formed in the diffuser membrane 103.
  • the slits 108 to 110 are exaggerated and enlarged as compared with actual ones for easy understanding, but in actuality, the slits 108 to 110 have a minute size.
  • the length of each of the slits 108 to 110 is preferably set in the range of 0.2 mm to 1 mm, more preferably in the range of 0.4 mm to 0.6 mm.
  • the actual number of the slits 108 to 110 is larger than the number depicted in FIGS. Further, the first slit 108 and the third slit 109 may have the same length, or may have different lengths.
  • the shape of the diffuser membrane 103 is rectangular or circular.
  • an elliptical shape, an oval shape in which both ends are formed in an arc shape, an L shape, A square shape, a rhombus shape, etc. may be sufficient.

Abstract

L'invention concerne un diffuseur d'air à membrane dans lequel des parties trous d'air sont ouvertes par l'expansion d'une membrane à diffusion d'air (3) pour former un dôme lorsqu'on l'observe dans une direction longitudinale (A) grâce à la pression de l'air fourni à la membrane de diffusion d'air (3) lorsque l'air est diffusé, une pluralité de premières parties trous d'air (8) et une pluralité de deuxièmes parties trous d'air (9) étant formées et disposées dans la direction longitudinale (A) et dans la direction latérale (B) de la membrane de diffusion d'air (3), les premières parties trous d'air (8) étant chacune un trou qui est plus long dans la direction longitudinale (A) de la membrane de diffusion d'air (3), les deuxièmes parties trou d'air (9) étant chacune un trou qui est plus long dans la direction inclinée par rapport à la direction longitudinale (A) de la membrane de diffusion d'air (3), et les deuxièmes parties trous d'air (9) étant chacune situées entre les premières parties trou d'air (8) adjacentes les unes aux autres dans la direction longitudinale (A) et/ou la direction latérale (B).
PCT/JP2011/052685 2011-02-09 2011-02-09 Diffuseur d'air à membrane WO2012108008A1 (fr)

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CN201180045608.0A CN103118991B (zh) 2011-02-09 2011-02-09 膜片式散气装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130093106A1 (en) * 2010-06-07 2013-04-18 Invent Umwelt-Und Verfahrenstechnik Ag Device for gassing liquids
WO2023278137A1 (fr) * 2021-06-30 2023-01-05 Corning Incorporated Macrobarboteur pour bioréacteurs de référence

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111246931A (zh) * 2017-09-29 2020-06-05 爱科特麦克司有限公司 用于流体曝气的扩散器

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB824376A (en) * 1956-12-19 1959-11-25 Distillers Co Yeast Ltd Gas liquid contacting means
EP0385198A1 (fr) * 1989-03-03 1990-09-05 Passavant-Werke Ag Appareil pour l'aération d'eau et d'eau usée
JPH0343400U (fr) * 1989-09-01 1991-04-23
JPH0427496A (ja) * 1990-05-22 1992-01-30 Fuji Electric Co Ltd 廃水処理装置の曝気装置
JP2000185245A (ja) * 1998-12-22 2000-07-04 Monobe Engineering:Kk 曝気装置
JP2001246394A (ja) * 2000-03-06 2001-09-11 Suido Kiko Kaisha Ltd 曝気槽における散気体の昇降装置
JP2005262140A (ja) * 2004-03-19 2005-09-29 Kurita Water Ind Ltd 下水処理方法及び装置
JP2007000777A (ja) * 2005-06-23 2007-01-11 Mitsubishi Cable Ind Ltd 多孔膜材及び散気装置
JP2007117871A (ja) * 2005-10-27 2007-05-17 Mitsubishi Cable Ind Ltd 多孔膜材及び散気装置
JP2007307439A (ja) * 2006-05-16 2007-11-29 Kubota Corp 浄化槽及びノズル体
JP2010104900A (ja) * 2008-10-30 2010-05-13 Kubota Corp メンブレン式散気装置
JP2010274233A (ja) * 2009-06-01 2010-12-09 Kubota Corp メンブレン式散気装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3636274A1 (de) * 1986-10-24 1988-04-28 Jaeger Arnold Vorrichtung zum belueften von wasser
CN101411968B (zh) * 2007-10-18 2011-06-01 康那香企业股份有限公司 曝气系统用的散气器
CN101870517A (zh) * 2009-04-24 2010-10-27 得利满水处理系统(北京)有限公司 一种曝气生物滤池的空气扩散器

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB824376A (en) * 1956-12-19 1959-11-25 Distillers Co Yeast Ltd Gas liquid contacting means
EP0385198A1 (fr) * 1989-03-03 1990-09-05 Passavant-Werke Ag Appareil pour l'aération d'eau et d'eau usée
JPH0343400U (fr) * 1989-09-01 1991-04-23
JPH0427496A (ja) * 1990-05-22 1992-01-30 Fuji Electric Co Ltd 廃水処理装置の曝気装置
JP2000185245A (ja) * 1998-12-22 2000-07-04 Monobe Engineering:Kk 曝気装置
JP2001246394A (ja) * 2000-03-06 2001-09-11 Suido Kiko Kaisha Ltd 曝気槽における散気体の昇降装置
JP2005262140A (ja) * 2004-03-19 2005-09-29 Kurita Water Ind Ltd 下水処理方法及び装置
JP2007000777A (ja) * 2005-06-23 2007-01-11 Mitsubishi Cable Ind Ltd 多孔膜材及び散気装置
JP2007117871A (ja) * 2005-10-27 2007-05-17 Mitsubishi Cable Ind Ltd 多孔膜材及び散気装置
JP2007307439A (ja) * 2006-05-16 2007-11-29 Kubota Corp 浄化槽及びノズル体
JP2010104900A (ja) * 2008-10-30 2010-05-13 Kubota Corp メンブレン式散気装置
JP2010274233A (ja) * 2009-06-01 2010-12-09 Kubota Corp メンブレン式散気装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130093106A1 (en) * 2010-06-07 2013-04-18 Invent Umwelt-Und Verfahrenstechnik Ag Device for gassing liquids
US9556047B2 (en) * 2010-06-07 2017-01-31 Invent Umwelt-Und Verfahrenstechnik Ag Device for gassing liquids
WO2023278137A1 (fr) * 2021-06-30 2023-01-05 Corning Incorporated Macrobarboteur pour bioréacteurs de référence

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