JP2010274233A - Membrane type air diffusion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a membrane type air diffusion apparatus which can prevent the breakage of an air diffusion membrane due to fatigue. <P>SOLUTION: The membrane type air diffusion apparatus is provided with a bag-shaped body 2 obtained by joining sheet-shaped members 5, 6, an air diffusion region 7 is provided at the sheet-shaped member 6 forming at least an upper face part of the bag-shaped body 2, and a breaking suppression region 32 having larger rigidity than the air diffusion region 7 is provided at least at a part of a center part of the air diffusion region 7 in a width direction orthogonally crossing an axial direction of the bag-shaped body 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a membrane-type air diffuser installed in a tank such as a sewage treatment facility, and relates to a technique for performing air diffusion for biological treatment or stirring.

  Conventionally, this type of air diffuser includes those shown in FIGS. 15 and 16, for example. In this case, a diffuser film 52 is mounted on the upper surface of the base plate 51 and an air supply port 53 is provided at a predetermined position. The air supply port 53 communicates between the base plate 51 and the air diffuser film 52. The diffuser film 52 is a synthetic resin film or synthetic rubber film provided with a large number of small holes 54, and has a structure in which the periphery of the diffuser film 52 is fixed to the base plate 51 by a fixing portion 55.

  As shown in FIG. 16A, when the operation is stopped, the diffuser membrane 52 receives water pressure and comes into contact with the upper surface of the base plate 51, and the small holes 54 of the diffuser membrane 52 are closed. During operation, compressed air is supplied between the base plate 51 and the diffuser membrane 52. At this time, as shown in FIG. 16B, the diffuser membrane 52 swells away from the upper surface of the base plate 51 due to the pressure of the compressed air, and a small hole 54 is opened. Air is diffused.

  As what has such a structure, there exists a membrane-type aeration apparatus of patent document 1, for example. In this, air holes are formed on the top surface of a plate-like holder having an air chamber inside, and a membrane is mounted on the upper surface of the holder. The membrane is a synthetic resin film or a synthetic rubber film provided with a large number of small holes, and its periphery is fixed to the upper surface of the holder by a frame-like frame. The small holes of the membrane are closed by water pressure when the operation is stopped, and when compressed air is supplied to the air chamber, the membrane expands, and the small holes open to diffuse into the water.

  In addition, the panel-type air diffuser described in Patent Document 2 has an air diffuser disposed on one surface of a flat metal or synthetic resin base plate, and the four edges of the air diffuser and the base plate. The part is fixed to a metal frame through packing. The diffuser membrane has a large number of small holes, and the material thereof is made of synthetic resin or synthetic rubber having moderate elasticity such as polyurethane, silicon, ethylene propylene rubber (EPDM).

JP2003-320388 JP 2004-313938 A

  However, in the conventional configuration, at the time of operation, that is, at the time of foaming, the diffuser film 52 is separated from the upper surface of the base plate 51 due to the pressure of the compressed air, and is curved and swells into a curved shape. The curved surface shape of the diffuser film 52 has a smaller curvature in the short width direction than in the long longitudinal direction, so that the influence of the force acting on the diffuser film 52 is greater in the width direction than in the longitudinal direction.

  When the operation is stopped, the diffuser membrane 52 receives water pressure and comes into contact with the upper surface of the base plate 51, and the diffuser membrane 52 is fixed to the base plate 51 when the small hole 54 of the diffuser membrane 52 is closed. The portion comes into contact with the base plate 51 and sequentially comes into contact from both sides in the width direction toward the central portion. For this reason, as shown in FIG.16 (c), in the center part of the width direction of the diffuser film 52, a wrinkle may arise along a longitudinal direction. When the operation and stop of the air diffuser are repeated, soot is repeatedly generated in the central portion of the air diffuser film 52, and a longitudinal tear 521 is generated in the air diffuser film 52 due to fatigue of the material. The tear 521 is likely to occur starting from the opening edge of the small hole 54, and when the diffuser film 52 is torn between the adjacent small holes 54, the bubble diameter ejected from the small hole 54 becomes large and coarse bubbles are generated.

  This invention solves an above-described subject, and it aims at providing the membrane type air diffuser which can prevent the damage of the air diffuser film by fatigue.

  In order to solve the above-mentioned problems, a membrane-type air diffuser of the present invention includes a bag-like body formed by joining sheet-like members, and an air-diffusing region is provided on the sheet-like member forming at least the upper surface portion of the bag-like body. And a breakage suppression region having a rigidity higher than that of the air diffusion region is provided in at least a part of the central portion of the air diffusion region in the width direction orthogonal to the axial direction of the bag-like body.

  Further, in the membrane-type air diffuser of the present invention, the fracture suppression region includes a longitudinal region that longitudinally cuts a central portion in the width direction of the air diffused region along the axial direction of the bag-shaped body, and an axial direction of the bag-shaped body. At least one of a transverse region that crosses the diffused region along a direction intersecting with the air diffuser.

  The membrane-type air diffuser of the present invention includes a bag-like body formed by joining sheet-like members, and provides an air-diffusing region in the sheet-like member forming at least the upper surface portion of the bag-like body. A breakage suppression region that vertically cuts along the axial direction of the bag-like body is provided at the center of the air diffusion region in the width direction orthogonal to the direction, and the breakage suppression region forms a non-aeration region.

  Further, in the membrane-type air diffuser of the present invention, the bag-like body is formed of a non-breathable sheet-like member on the lower surface portion, and the air-permeable sheet-like member in which the upper face portion forms a diffused region and the outer periphery of the diffused region. It is characterized by comprising a non-breathable sheet-like member that forms a region, and the rupture suppression region is comprised of a non-breathable sheet-like member.

  The reaction tank of the present invention includes a tank body for storing the target processing liquid and an air diffuser disposed in the tank, and the air diffuser is composed of any one of the above membrane-type air diffusers. .

  As described above, according to the present invention, the air diffusion region has a breakage suppression region having a rigidity higher than that of the air diffusion region in at least a part of the central portion in the width direction orthogonal to the axial direction of the bag-like body, The fracture suppression region becomes a bending resistance against the wrinkling that occurs at the time of transition from the operation state to the operation stop state. For this reason, it can suppress by a fracture | rupture suppression area | region that a diffused area | region bends locally, and it can suppress that a tear arises in the longitudinal direction of a diffused area | region due to fatigue of material.

  The rupture suppression region is preferably formed as a longitudinal region that longitudinally cuts the central portion in the width direction of the air diffusion region along the axial direction of the bag-like body, but at least part of the central portion in the width direction of the air diffusion region If present, it is possible to suppress the occurrence of continuous wrinkling in the longitudinal direction of the diffused region and to exert its effect, so the fracture-suppressed region is the diffused region along the direction intersecting the axial direction of the bag-like body. The present invention can be realized even when formed as a transverse region that crosses.

  Fracture due to material fatigue in the diffused region is likely to occur starting from small holes in the diffused region, so the center of the bag-shaped member is at the center of the diffused region in the width direction perpendicular to the axial direction of the bag-shaped member. By providing a rupture suppression region that longitudinally cuts along the direction and forming the rupture suppression region as a non-aeration region, even if squeezing occurs along the longitudinal direction of the diffusion region, the rupture of the diffusion region is suppressed Is possible.

The top view which shows the bag-shaped body in embodiment of this invention Sectional drawing which shows the nozzle in the same embodiment Sectional drawing which shows the principal part of the bag-shaped body in the embodiment The top view which shows the membrane type diffuser in the same embodiment The front view which shows the membrane type diffuser in the same embodiment Front view showing the coupling fixing part 13 The top view which shows the bag-shaped body in other embodiment of this invention The top view which shows the bag-shaped body in other embodiment of this invention The top view which shows the bag-shaped body in other embodiment of this invention The top view which shows the bag-shaped body in other embodiment of this invention The schematic diagram which shows the effect | action of the fracture | rupture suppression area | region in embodiment of this invention. Sectional drawing which shows the membrane type diffuser in other embodiment of this invention Sectional drawing which shows the membrane type diffuser in other embodiment of this invention Sectional drawing which shows the membrane type diffuser in other embodiment of this invention A perspective view showing a conventional air diffuser Schematic diagram showing the operation of a conventional diffuser

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 6, the membrane-type air diffuser 1 is composed of a bag-like body 2 whose main body extends in a strip shape, and a nozzle 4 is attached to an air supply port 3 provided on one outer edge of the bag-like body 2. And is connected to an air supply source (not shown) via the nozzle 4. The shape of the bag-like body 2 may be any shape such as a balloon shape, a disc shape, a square shape, a rhombus shape, and a cylindrical shape.

  The bag-like body 2 is formed by joining sheet-like members 5 and 6 made of a synthetic resin of a soft elastic material to each other by welding. In this embodiment, the air-permeable sheet-like member 5 and the air-permeable sheet-like member ( The diffuser membrane 6 is made of polyurethane.

  The bag-like body 2 is composed of an air-permeable sheet-like member 5 having a lower surface portion and an air-permeable sheet-like member 6 whose upper surface portion forms an air-diffusing region 7, an outer peripheral region 31 surrounding the air-diffusing region 7, and a diffuser. It consists of an air-impermeable sheet-like member 5 that forms a fracture inhibiting region 32 that covers a part of the air region 7.

  In the present embodiment, the breakage suppression region 32 is formed as a vertical cut region 321 that vertically cuts the central portion in the width direction of the air diffusion region 7 along the axial direction of the bag-like body 2. When the air-permeable sheet-like member 5 and the air-permeable sheet-like member 6 overlap, the breakage suppression region 32 becomes a portion whose rigidity is greater than that of the air diffusion region 7. The rupture suppression region 32 is a single layer of the air-impermeable sheet-like member 5, and the rigidity of the rupture suppression region 32 can be made larger than that of the air diffusion region 7 by adjusting the thickness and material thereof.

  The present invention can be realized by forming the breakage suppression region 32 not only in the longitudinal region 321 but also in at least a part of the central portion in the width direction of the air diffusion region 7. For example, as shown in FIG. 8, the breakage suppression region 32 can be formed as a transverse region 322 that crosses the air diffusion region 7 along the direction intersecting the axial direction of the bag-like body 2. Although the region 322 is formed in a direction orthogonal to the axial direction of the bag-like body 2, it can be formed in a direction inclined with respect to the axial direction of the bag-like body 2. The transverse region 322 may be provided with a pair on both sides of the air diffusion region 7, and may be arranged at a predetermined interval along the axial direction of the bag-like body 2. Therefore, the fracture suppression region 32 may be any one having at least one of the vertical region 321 and the transverse region 322, but the fracture suppression region 32 includes both the vertical region 321 and the transverse region 322 as shown in FIG. It is also possible to have a different shape. Furthermore, as shown in FIG. 9, it is also possible to form the rupture suppression region 32 in the mesh region 323, and at least one of the central part of the air diffusion region 7 in the width direction perpendicular to the axial direction of the bag-like body 2. The present invention can be realized if there is a rupture suppression region 32 having a rigidity higher than that of the air diffusion region 7 in the part.

  Further, as shown in FIG. 10, a breakage suppression region 32 that is longitudinally cut along the axial direction of the bag-like body 2 is provided at the center of the air diffusion region 7 formed of the air-permeable sheet-like member 6, and the breakage suppression region 32 is provided. May be formed in the non-aeration region 324 having no small holes. Further, a small hole is processed in a predetermined region of the air-impermeable sheet-like member 5 without forming the air-diffusing region 7 by joining the air-permeable sheet-like member 6 to the air-impermeable sheet-like member 5. Thus, the air diffusion region 7 may be formed, and the non-air diffusion region 324 may be formed in the air-impermeable sheet-like member 5 as the breakage suppression region 32 that vertically cuts along the axial direction of the bag-like body 2.

  The joining of the sheet-like members 5 and 6 is not limited to thermal welding or high-frequency welding, but can be performed by other welding methods such as ultrasonic welding or bonding, and mechanical means such as bolts can be used in combination. . The sheet-like members 5 and 6 are not limited to polyurethane, but may be made of other materials such as polyurethane reinforced with polyester fiber or nylon fiber, or silicon rubber.

  For example, polyurethane is used for the air-permeable sheet-like member 6 that forms the air diffusion region, and polyurethane reinforced with polyester fiber or the like is used for the air-permeable sheet-like member 5 that forms the outer peripheral region of the air diffusion region 7. It is also possible.

  The bag-like body 2 has an outer edge of the bag-like body 2 having a joint 8 formed by airtightly welding the air-impermeable sheet-like member 5 on the lower surface portion and the air-permeable sheet-like member 5 on the outer peripheral region of the upper surface portion. And a joint portion 9 formed by air-tightly bonding the air-permeable sheet-like member 6 on the upper surface portion and the air-impermeable sheet-like member 5 on the outer peripheral region to the entire periphery of the air-diffusing region 7. It is formed along.

  However, it is also possible to use a resin plate or a resin pipe in place of the non-breathable sheet-like member 5 on the lower surface serving as a substitute member of the conventional base plate, and the breathable sheet-like member 6 forming a diffused film. Any material can be used as long as it can be welded, and the shape and properties thereof are not limited.

  Further, as shown in FIG. 12, it is possible to join the bag-like body 2 to the flat base plate 50a at the peripheral edge, and as shown in FIG. 13, the bag-like body 2 is attached to the base plate 50b curved upward. As shown in FIG. 14, the bag-like body 2 can be joined to the base plate 50c curved downward at the periphery.

  As shown in FIG. 2, the nozzle 4 inserted into the air supply port 3 of the bag-like body 2 includes a plurality of welded portions 10 having an air-impermeable sheet-like member 5 on the lower surface portion and an air-impermeable sheet-like shape on the upper surface portion. The air supply port 3 and the nozzle 4 are opened in a direction parallel to the sheet-like members 5 and 6. The shape of the nozzle 4 is not limited to that shown in FIG. 2, and any shape can be adopted. The connection of the air supply source to the nozzle 4 can be made from any angle such as upward, downward, and horizontal. good.

  As shown in FIG. 3, the bag-like body 2 is provided with insertion holes 11 extending in the longitudinal direction of the bag-like body 2 in the outer peripheral region of the air diffusion region 7 on both sides in the width direction. The support member 12 is inserted into the insertion hole 11.

  As shown in FIGS. 5 and 6, the support member 12 is fixed to the connecting and fixing portions 13 that are parallel to the longitudinal direction of the bag-like body 2 and are arranged on both ends in the axial direction of the support member 12. Specifically, the screw portions 14 formed at both ends of the support member 12 are inserted into L-shaped cutouts 15 formed in the connection fixing portion 13, and the connection fixing portion 13 is sandwiched and fixed between a pair of nuts 16. is there. A member such as a rod or a wire may be used in place of the support member 12. Note that the fastening with the nut 16 is not necessarily required, and the support member 12 may be merely engaged with the L-shaped cut-out opening 15. Therefore, the support member 12 is not separated from the cut opening 15.

  The structure for fixing the support member 12 to the connection fixing portion 13 is not limited to the above-described structure, and there are various forms, and the support member 12 can be fixed to the upper surface of the connection fixing portion 13 with bolts and nuts.

  The nozzle 4 is pressed against the connection fixing part 13 by a fixing band 17, and the fixing band 17 is fixed to the connection fixing part 13 by a bolt 18 and a nut 19. The connection fixing part 13 is fixed to the reaction vessel 21 with anchor bolts 20.

The nozzle 4 does not necessarily have to be fixed to the connection fixing portion 13, and the nozzle 4 can be provided on the upper surface of the bag-like body 2.
The present invention can be applied to various reaction tanks 21 and, for example, performs water treatment and is used in an activated sludge method or the like.

  Hereinafter, the operation of the above-described configuration will be described. During operation, air of a predetermined pressure is supplied from the air supply source (not shown) through the nozzle 4 and the air supply port 3 into the bag 2. During operation, the bag-like body 2 is inflated by the pressure of the air supplied to the inside, and air is blown out from the air diffusion region 7 through the air-permeable sheet-like member 6 forming the air diffusion film. Aeration occurs in the water to be treated.

  The air supply port 3 and the nozzle 4 provided on the outer edge of the bag-like body 2 open in a direction parallel to the sheet-like members 5 and 6, so that air flows in the axial direction of the air supply port 3 and the nozzle 4. The air supply port 3 and the air supplied from the nozzle 4 have no air-permeable sheet-like member 5 on the lower surface portion, air-permeable sheet-like member 6 on the upper surface portion, and air-impermeable air. Since it spreads along the sheet-like members 5, 6 between the sheet-like member 5, smoothly spreads to the air supply port and the opposite end opposite to the nozzle 4, and air blows out from the entire surface of the air diffusion region 7. There is no bias in the aeration.

  In addition, since the support members 12 arranged on both sides in the width direction of the bag-like body 2 support the bag-like body 2 over the entire length of the bag-like body 2 in the outer peripheral region of the air diffusion region 7, The bag-like body 2 can be held in a horizontally elongated state against the generated buoyancy, and the stress generated in the bag-like body 2 due to the buoyancy is dispersed over the entire length of the bag-like body 2 to form a bag-like shape. Damage to the body 2 can be prevented.

  When the supply of air is stopped when the operation is stopped, the bag-like body 2 receives the surrounding water pressure, and the air-permeable sheet-like member 6 and the air-permeable sheet-like member 5 on the upper surface part are impermeable sheet-like on the lower surface part. By press-contacting the member 5, the soft elastic material comes into close contact with each other, so that a higher water-stopping property is exhibited. The air-permeable sheet-like member 5 on the upper surface and the air-impermeable on the lower surface are provided around the air supply port 3. When the sheet-like member 5 is in pressure contact, even if water enters from a small hole, the area around the air supply port is sealed, so that the water-stopping property becomes high, and the water receiving the surrounding water pressure flows back to the air supply port. There is no.

  By the way, when the operation is stopped, there is a case where wrinkles occur along the longitudinal direction in the center in the width direction of the air diffused region 7, and the wrinkles are repeatedly generated by the operation and stop of the air diffuser, and are scattered by the fatigue of the material. A longitudinal tear may occur in the air region 7, and this tear is likely to start from the opening edge of the small hole.

  However, in the present invention, the air diffusion region 7 includes a longitudinal region 321, a breakage suppression region 32 having a rigidity higher than that of the air diffusion region 7 in at least a part of the central portion in the width direction orthogonal to the axial direction of the bag-like body 2. As shown in FIG. 11, the rupture suppression region 32 becomes a bending resistance against the wrinkling that occurs at the time of transition from the operation state to the operation stop state. For this reason, it can suppress by the fracture | rupture suppression area | region 32 that the aeration area | region 7 bends locally, and it can suppress that a tear arises in the longitudinal direction of the aeration area | region 7 resulting from fatigue of material.

  In addition, since fracture due to material fatigue in the air diffused region 7 is likely to occur starting from the small holes in the air diffused region 7, the material diffuses in the center of the air diffused region 7 in the width direction perpendicular to the axial direction of the bag 2. By forming the rupture suppression region 32 that vertically cuts along the axial direction of the bag-like body 2 as the non-aeration region 324, even if squeezing occurs along the longitudinal direction of the diffusion region 7, It is possible to suppress breakage.

  Since the joint portions 8 and 9 of the bag-like body 2 are formed by welding the sheet-like members 5 and 6 made of a soft elastic material, both members are integrated at the joint surfaces of the joint portions 8 and 9 by melting the resin. In addition, airtightness at the joints 8 and 9 is improved, and there is no structural element that causes stress concentration at the joints 8 and 9, and damage due to stress concentration during operation and when operation is stopped can be prevented.

  In addition, there is no need for caulking frames, fastening bolts and nuts as in the past, and the number of parts can be reduced, and the press pressure and tightening torque when installing caulking frames, fastening bolts and nuts can be reduced. Adjustment is unnecessary, and troubles caused by processing errors and construction errors can be reduced.

DESCRIPTION OF SYMBOLS 1 Membrane type diffuser 2 Bag-like body 3 Air supply port 4 Nozzle 4a Flange 5 Air-impermeable sheet-like member 6 Air-permeable sheet-like member 7 Air diffused region 8, 9 Joint part 10 Welding part 11 Insertion hole 12 Support Member 13 Connection fixing part 14 Thread part 15 Cut port 16 Nut 17 Fixing band 18 Bolt 19 Nut 20 Anchor bolt 21 Reaction tank 31 Outer peripheral area 32 Breaking suppression area 50a Flat base plate 50b Base plate curved upward 50c Base plate curved downward Longitudinal area 322 Transverse area 323 Mesh area 324 Non-aeration area

Claims (5)

  A bag-like body formed by joining sheet-like members, a diffused region is provided in the sheet-like member forming at least the upper surface portion of the bag-like body, and the air-diffusing region in the width direction orthogonal to the axial direction of the bag-like body A membrane type air diffuser characterized in that a breakage suppression region having a rigidity higher than that of the air diffusion region is provided in at least a part of the central portion of the membrane.   The rupture suppression region traverses the diffused region along a direction intersecting the axial center direction of the bag-like body and a longitudinal region that vertically cuts the central portion in the width direction of the diffused region along the axial direction of the bag-like body. The membrane-type air diffuser according to claim 1, further comprising at least one of a crossing region.   A bag-like body formed by joining sheet-like members, a diffused region is provided in the sheet-like member forming at least the upper surface portion of the bag-like body, and the air-diffusing region in the width direction orthogonal to the axial direction of the bag-like body A membrane-type air diffuser characterized in that a breakage suppression region that longitudinally cuts along the axial direction of the bag-like body is provided at the center of the bag, and the breakage suppression region forms a non-aeration region.   The bag-like body is made of a sheet-like member having an air-impermeable lower surface portion, and a gas-permeable sheet-like member having an upper surface portion forming an air diffused region and an air-impermeable sheet-shaped member forming an outer peripheral region of the air diffused region, The membrane-type air diffuser according to any one of claims 1 to 3, wherein the rupture suppression region is made of an air-impermeable sheet-like member.   A tank body for storing the target treatment liquid and an air diffuser disposed in the tank are provided, and the air diffuser comprises the membrane air diffuser according to any one of claims 1 to 4. To the reaction tank.

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