JP4056281B2 - Membrane diffuser using diffuser holder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of an air diffuser used in an aeration tank of a sewage treatment plant, and more particularly to a membrane air diffuser using an existing air diffuser plate holder.
[0002]
[Prior art]
In an aeration tank of a sewage treatment plant, as shown in FIG. 6, there are many air diffusers having a structure in which a porous air diffuser plate 2 is mounted on a square air diffuser plate holder 1 and fixed with fixing metal fittings 3. Although it is installed, it may be required to replace the diffuser plate 2 whose air permeability has been lowered due to long-term use with a membrane (a diffuser membrane). However, since the structure of the conventional membrane diffuser is completely different from the porous ceramic diffuser plate 2, the existing diffuser plate holder 1 is completely removed when replacing the membrane diffuser. There is a problem that it has to be installed, which requires a lot of construction time and cost, and generates a lot of waste.
[0003]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, and uses an existing diffuser plate holder, whereby a membrane diffuser using a diffuser plate holder that can be easily and inexpensively replaced with a membrane. It was made to provide.
[0004]
[Means for Solving the Problems]
The invention of claim 1 has been made in order to solve the aforementioned problem, a holder frame which is formed on the outer circumference, square formed by continuously and dished bottom with a air supply hole to the inside air diffuser The target is an existing diffuser with a ceramic diffuser plate mounted on the holder frame of the plate holder and fixed with fixing brackets, and the outer periphery of the rectangular membrane is fixed to the frame and given tension. The cartridge-shaped membrane was inserted into the dish-shaped bottom of the diffuser plate holder from which the ceramic diffuser plate was removed from the existing diffuser, and the upper surface of the outer peripheral frame was inserted through a frame-shaped presser jig . and by adjusting the thickness of the frame-shaped fixing jig, together with pressure and fixed pressing to the said dish shaped bottom portion with fixing clasp that secured the ceramic diffuser air plate, the dish upon installation work and repair work Water at the bottom of the membrane It is characterized in that which enables preventing燥.
The invention of claim 2 has been made to solve the same problem, a holder frame which is formed on the outer periphery, dusting square formed by continuously and dished bottom with a air supply holes on the inside It is intended for existing diffusers that consist of an air plate holder, and a ceramic diffuser plate is mounted on the holder frame and fixed with fixing metal fittings. A diffuser plate holder in which a membrane is laminated on the upper surface of a plate-like rigid body having an air flow path and only the periphery thereof is fixed to the plate-like rigid body, and the ceramic diffuser plate is removed from the existing diffuser The ceramic diffuser plate is fixed on the holder frame and fixed with the fixing bracket, and the membrane can be supported on the upper surface of the plate-like rigid body when the diffuser is stopped. It is.
[0005]
Furthermore the invention of claim 3 has been made to solve the same problem, dispersion of a holder frame which is formed on the outer periphery, and formed continuously with the dish-shaped bottom portion with a air supply holes on the inside square A bottom plate with a rectangular membrane penetrating the air flow path, intended for an existing diffuser device that consists of a gas plate holder and a ceramic diffuser plate mounted on the holder frame and fixed with a fixing bracket. Place the cartridge-shaped membrane, which is placed on the top and fixed to the frame, on the holder frame of the diffuser plate holder from which the ceramic diffuser plate has been removed from the existing diffuser. used, and by adjusting the thickness of the frame-shaped fixing jig, with pressure to fix pressing an outer peripheral portion of the cartridge-like membrane at the fixing brackets that secured the ceramic diffuser air plate holder frame , Stop aeration It is characterized in that the membrane was capable supported by the upper surface of the bottom plate.
[0006]
Since the membrane diffuser of any of the inventions described above is a membrane attached using the existing diffuser plate holder and the metal fitting for fixing the diffuser plate as they are, the membrane diffuser can be easily and inexpensively replaced with the membrane. be able to.
Preferred embodiments of each invention are shown below.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
(Invention of Claim 1)
In FIG. 1, reference numeral 1 denotes an existing quadrangular diffuser plate holder, and a holder frame 5 is formed on the upper periphery of the dish-shaped bottom 4. Illustrated so on, a holder frame 5 formed on the outer periphery, on the inside, consists diffuser plate holder 1 Tokyo rectangle formed by continuously and dished bottom 4 equipped with air supply holes 15, the holder Targeted is an existing diffuser device in which a ceramic diffuser plate is mounted on a frame 5 and fixed by a fixing bracket 3. In this embodiment, an existing diffuser plate fixed to the diffuser plate holder 1 is used. And a cartridge-like membrane 8 having a frame 6 and a packing 7 around it is inserted into the dish-like bottom 4 of the diffuser plate holder and attached.
[0008]
The frame 6 has the same vertical and horizontal dimensions as the existing diffuser plate holder dish-shaped bottom, and is made of, for example, a metal of 28 cm × 28 cm. The periphery of the membrane 8 made of resin or rubber is fixed to the frame 6 with a predetermined tension applied. The fixing method is not particularly limited. For example, the end of the membrane 8 is welded to the frame 6 as shown in FIG. 2A, and the end of the membrane 8 is wound around the frame 6 and fixed as shown in FIG. 2B. As shown in FIG. 2C, various methods such as forming a bead 9 integrally at the end of the membrane 8 and fitting the bead 9 in the groove 10 of the frame 6 and fixing it with the presser frame 11 are used. Can be adopted.
[0009]
If the packing 7 is also provided integrally on the lower surface of the frame 6, the whole is integrated into a cartridge shape, and this is inserted into the dish-shaped bottom portion 4 of the diffuser plate holder 1 as shown in FIG. The upper surface is fixed by the fixing bracket 3 through the frame-shaped presser jig 12. As the fixing metal fitting 3, an existing diffuser plate fixing metal fitting can be used as it is. The cartridge-like membrane 8 is thinner than the existing diffuser plate and is inserted into the dish-like bottom 4 so that the height of the upper surface is lower than that of the existing diffuser plate. It is preferable to increase the thickness of 12 so that it can be fixed with the existing fixing bracket 3. In addition, since the existing fixing metal fitting 3 is composed of a metal fitting 13 having a U-shaped cross section and a bolt 14, a slight thickness difference can be absorbed by the tightening allowance of the bolt 14.
[0010]
The membrane air diffuser of the invention of claim 1 configured as described above can supply compressed air from the membrane 8 by supplying compressed air from the air supply hole 15 formed in the center of the dish-like bottom portion 4 as in the prior art. The air can enter the lower space and diffuse while the membrane 8 is inflated. Further, when the aeration is stopped, the membrane 8 is pressed against the dish-like bottom 4 by water pressure. However, since the distance between the membrane 8 and the dish-like bottom 4 is short, the membrane 8 is not deformed or damaged. Further, if water is stored in the dish-shaped bottom portion 4, the membrane 8 does not dry during the installation work / renovation work, and deterioration of the membrane performance can be easily prevented.
[0011]
(Invention of Claim 2)
FIG. 3 is a sectional view showing an embodiment of the invention of claim 2. In this embodiment, a conventional diffuser plate is used in place of the conventional diffuser plate for the same existing diffuser device as in the previous embodiment using the diffuser plate holder 1 provided with the air supply holes 15. The membrane 8 is fixed to the upper surface of the rigid body 20 having the same size as the above. The material of the rigid body 20 is arbitrary, but in this embodiment, a long glass fiber reinforced foam commercially available as synthetic wood was used. This material is lightweight and corrosion-resistant, and has been used as a blind cover for the diffuser plate holder 1 conventionally. An air flow path 21 from the back surface to the front surface is formed in the rigid body 20. It is assumed that only the periphery of the membrane 8 is fixed to the rigid body 20. The method of fixing the membrane 8 to the rigid body 20 may be only welding. However, the membrane 8 may be pressed with a frame from the welded position, or the end of the welded membrane 8 may be fixed to the side surface of the rigid body 20 with an appropriate metal fitting. Good.
[0012]
In this way, the membrane 8 fixed to the upper surface of the rigid body 20 is placed on the holder frame 5 of the diffuser plate holder 1 with the packing 22 interposed therebetween, and fixed with the fixing bracket 3. And if compressed air is supplied from the air supply hole 15 formed in the center of the dish-shaped bottom part 4 as in the prior art, the compressed air passes between the membrane 8 and the rigid body 20 through the air flow path 21 of the rigid body 20. The air can be diffused while the membrane 8 is inflated. Further, even when the aeration is stopped, the membrane 8 is supported by the upper surface of the rigid body 20, so that it is not deformed or damaged. Furthermore, since this structure can freely increase the size of the rigid body 20 and the membrane 8 in the direction perpendicular to the paper surface of FIG. 3, the substantial foaming area can be expanded while using the existing diffuser plate holder 1.
[0013]
[0014]
[0015]
(Invention of Claim 3 )
FIG. 5 is a sectional view showing an embodiment of the invention of claim 3 . In this embodiment, the membrane 8 fixed on the bottom plate 30 is used for the same existing diffuser as in the previous embodiment using the diffuser plate holder 1 provided with the air supply holes 15. placed over the first holder frame 5 in the packing 33, but is fixed by the fixing bracket 3, in the embodiment of this, using a frame-shaped fixing jig 34 to adjust the height, for existing diffuser air plate The fixing bracket 3 can be used.
An air flow path 32 is passed through the bottom plate 30. Also in this air diffuser, if compressed air is supplied from the air supply hole 15 formed in the center of the dish-like bottom portion as in the conventional case, the compressed air passes between the membrane 8 and the bottom plate 30 through the air flow path 32 of the bottom plate 30. The air can be diffused while the membrane 8 is inflated. In addition, since the membrane 8 is supported in close contact with the upper surface of the bottom plate 30 even when the aeration is stopped, the membrane 8 is not deformed or damaged.
[0016]
【The invention's effect】
As described above, since the membrane diffuser of each invention of the present application uses the existing diffuser plate holder and the fixing bracket as they are, it can be easily replaced with the membrane, and the construction period Can also be shortened. Moreover, since it is not necessary to remove the existing diffuser plate holder and its piping, the amount of waste generated can be reduced. In addition, the membrane is reliably prevented from being deformed or damaged when the aeration is stopped, and can perform the same function as a dedicated membrane aeration device.
[Brief description of the drawings]
1 is a cross-sectional view showing an embodiment of the invention of claim 1;
FIG. 2 is a cross-sectional view showing a method for fixing a membrane end.
FIG. 3 is a sectional view showing an embodiment of the invention of claim 2;
4 is a cross-sectional view showing an embodiment of the invention of claim 3. FIG.
FIG. 5 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
1 Diffuser holder, 2 Conventional diffuser plate, 3 Fixing bracket, 4 Dish bottom, 5 Holder frame, 6 frame, 7 Packing, 8 Membrane, 9 Bead, 10 Frame groove, 11 Presser frame, 12 frame Presser jig, 13 U-shaped bracket, 14 bolt, 15 air supply hole, 20 rigid body of the same size as the diffuser plate, 21 air flow path, 30 bottom plate, 31 U-shaped frame in cross section, 32 Air flow path, 33 packing, 34 Frame-shaped presser jig

Claims (3)

A holder frame which is formed on the outer periphery, fixing put the ceramic diffuser air plate to the holder frame diffuser plate holder square formed by continuously and dished bottom with a air supply holes on the inside Targeting an existing diffuser that is fixed with metal fittings, a cartridge-like membrane in a state in which the outer periphery of a rectangular membrane is fixed to a frame and given a predetermined tension is applied to the ceramic diffuser from the existing diffuser. Insert the bottom plate of the diffuser plate holder with the air plate removed , and adjust the thickness of the frame-shaped presser jig on the upper surface of the outer frame through the frame-shaped presser jig . The fixing bracket that fixed the diffuser plate was pressed and fixed to the dish-shaped bottom part, and water was stored in the dish-shaped bottom part during installation work / renovation work to prevent drying of the membrane. Features a diffuser plate holder Use the membrane air diffuser. Place a holder frame which is formed on the outer periphery, composed of a diffuser plate holder square formed by continuously and dished bottom with a air supply holes on the inside, a ceramic diffuser air plate to the holder frame The membrane is laminated on the upper surface of a plate-like rigid body having the same size as the diffuser plate and having an air flow path from the back surface to the front surface. The above-mentioned fixing, in which only the periphery is fixed to a plate-like rigid body is placed on the holder frame of a diffusion plate holder from which the ceramic diffusion plate is removed from the existing diffusion device, and the ceramic diffusion plate is fixed A membrane diffuser using a diffuser plate holder , wherein the membrane is fixed by a metal fitting, and the membrane can be supported on the upper surface of the plate-like rigid body when the diffuser is stopped . Place a holder frame which is formed on the outer periphery, composed of a diffuser plate holder square formed by continuously and dished bottom with a air supply holes on the inside, a ceramic diffuser air plate to the holder frame For the existing diffuser device that is fixed with a fixing bracket, a cartridge-like membrane in which a rectangular membrane is placed on the bottom plate that penetrates the air flow path and the periphery is fixed to a frame, The ceramic diffuser plate is removed from the existing diffuser and placed on the holder frame of the diffuser plate holder. A frame-shaped holding jig is used and the thickness of the frame-shaped holding jig is adjusted. The outer peripheral part of the cartridge-like membrane was pressed against the holder frame and fixed with the fixing bracket that fixed the air diffuser plate, and the membrane could be supported on the upper surface of the bottom plate when the air diffuser stopped. The Membrane air diffuser utilizing diffuser plate holder for the symptoms.

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