JPS6144557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an aeration device used in activated sludge treatment, fish tank aeration, gas-liquid contact process, etc., and in particular, it is easy and reliable to assemble, dismantle, etc. The present invention relates to an air diffuser that has excellent sealing effects and does not come loose even under vibration.

Conventional diffuser plates and cylinders, which are conventional diffuser devices, have low oxygen dissolution efficiency, making it difficult to reduce power consumption. For this reason, air diffusers that generate microbubbles have been announced.

As shown in FIG. 1, by releasing air through a disc-shaped disk 1 having fine ventilation holes
FIG. 2 is a front cross-sectional view of an air diffuser capable of producing fine bubbles. As is clear from the figure, in this device, a funnel-shaped disk holder 3 is placed via a gasket 4 on the top surface of a header pipe 2, which is a type of air supply pipe that is arranged in parallel at the bottom of the aeration tank. Attach the adapter 5 to the threaded part of the header pipe 2.
The boss portion 6 of the disk holder 3 is clamped between the adapter 5 and the gasket 4 by screwing, and the disk holder 3 is fixed to the header pipe 2. Further, the air-permeable disk 1 placed in the upper opening of the disk holder 3 via the gasket 4 is pressed against the gasket 8 by the mounting bolt 7 screwed into the adapter 5, and the space between the disk holder 3 and the disk 1 is closed. We are making stickers. The adapter 5 has a vertical hole 9 that communicates with the header pipe 2 and a horizontal hole 11 that intersects the vertical hole 9 and communicates with the space 10 inside the disk holder 3. The compressed air inside passes through the vertical holes 9 and horizontal holes 11 into the air 1.
0, and further permeates through the fine holes in the disk 1 and is released into the liquid mixture 12 as fine bubbles.
A large number of such aeration devices are installed at the bottom of the aeration tank in order to uniformly send air throughout the aeration tank. Since there are a large number of air diffusers, the amount of air released from each air diffuser is small, and the force caused by the flow of air bubbles is small, so there is no problem of destroying microorganism flocs. In addition, since the oxygen dissolution efficiency is high, the total amount of air is small, and power consumption is reduced.

However, in the above-mentioned device, the seal between the disk holder 3 and the header tube 2 is achieved by the gasket 4 sandwiched between the upper surface of the header tube and the lower surface of the disk holder. It is difficult to maintain a constant gap between the disk holder and the lower surface of the disk holder, and it is difficult to obtain a state of close contact with both surfaces of the gasket. In particular, when the adapter 5 is tightened, the disk holder 3 may rotate together and the directions of the disk holder and the header tube may not match. If this happens, the bottom surface of the disk holder will not line up perfectly with the header tube surface, and the gasket 4 will No sealing effect is exerted.

Further, the seal between the disk 1 and the disk holder 3 relies only on the pressing force of the bolt 7 at the center, but such pressing force at the center of the disk alone is insufficient to press the disk against the gasket 8 with a sufficiently strong force. If the bolts 7 are tightened to compensate for this, the disk 1 and the disk holder 3 will bend, making it impossible to obtain an even pressure against the gasket 8, and failing to exhibit a sufficient sealing effect.

Furthermore, during the aeration operation, slight vibrations due to the generation of air bubbles etc. constantly act on the aeration device, and with the above-mentioned mounting structure using screws for the bolts 7 and adapters 5, the screws loosen early, causing damage to the threaded parts. Adhesives are used to secure the discs, but with this method, even if the disks become clogged, they cannot be easily replaced, and the equipment may be damaged during disassembly, and work efficiency may be reduced. There were some inconveniences.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the drawbacks inherent in the conventional air diffuser as described above, and to connect a disk holder that opens upwardly to a gas supply pipe in communication with the disk holder. In the air diffuser, the upper opening of the disc is closed by a permeable disc, and the compressed gas that has flowed into the disc holder from the gas supply pipe is released as microbubbles into the external liquid from the ventilation pores of the disc. and a substantially C-shaped clamping member that is fixed to the peripheral end of the disc holder and clamps the disc and disc holder in a sealed manner via a sealing material, and a clamping member that is bored in the mounting neck of the disc holder and the gas supply pipe. and a cylindrical elastic adapter that is installed between the mounting hole and the minimum inner diameter of the adapter is smaller than the outer diameter of the mounting neck, and the mounting neck is inserted into the inner diameter of the elastic adapter inserted into the mounting hole. The object of the present invention is to provide an air diffuser in which the outer diameter of the elastic adapter is expanded by the elastic adapter, and the elastic adapter and the disk holder are sealed in the mounting hole.

Next, embodiments embodying the present invention will be described in detail with reference to the accompanying drawings starting from FIG. Here, FIG. 2 is an exploded perspective view of an air diffuser that is an embodiment of the present invention, FIG. 3 is a front sectional view showing the assembled state of the air diffuser, and FIG. 4 is a front sectional view of the air diffuser. Figure 5 is a front cross-sectional view showing the attached state of the gas supply pipe that can be used in the air diffuser, and Figure 6 is a front cross-sectional view of the elastic adapter that can be used in the air diffuser. FIG. 7 is a perspective view showing one aspect of how the clamping member is attached. FIG. 7 is a front sectional view showing a modified example of the structure for attaching the disk holder to the elastic adapter.

In FIGS. 2 and 3, a header pipe 20, which is a type of gas supply pipe, is arranged horizontally and has a plurality of mounting holes 21 formed at equal pitches on its upper surface. A substantially cylindrical elastic adapter 22 is made of an elastic material such as synthetic rubber having an appropriate hardness, and has a vertical hole 23 passing through it along the central axis of the cylinder. The elastic adapter 22 has a lower cylindrical part 24 for insertion into the attachment hole 21 of the header pipe, and an upper cylindrical part 25 with a larger diameter than the lower cylindrical part 24, and a connecting part between the two cylindrical parts 24 and 25. A saddle portion 26 having an arcuate cross-sectional shape projects laterally on the outer periphery. The saddle portion 26 is abutment against the header pipe 20 when the lower cylindrical portion 24 is inserted into the mounting hole 21. The vertical hole 23 vertically passes through both the cylindrical parts 24 and 25,
It is divided into an upper vertical hole 29 having an annular groove 20 on its inner circumferential surface with a stepped portion 27 in between, and a lower vertical hole 30 below the upper vertical hole 29 . The lower vertical hole 30 has a tapered shape that widens upward in the single unit state shown in FIG. 4 before assembly.

Reference numeral 31 denotes a disk having fine ventilation holes, which is placed on the upper opening 34 of a substantially funnel-shaped disk holder 33 which has a mounting neck 32 at the bottom that is fitted into the lower vertical hole 30, and closes the opening 34. . The mounting neck portion 32 is integral with a tapered portion 36 with a cylindrical body portion 35 in between, and is an outer peripheral surface of the body portion 35 until the bottom surface 37 of the body portion 35 comes into contact with the stepped portion 27. When inserted into the upper vertical hole 29, an annular groove 2 is formed at a height corresponding to the annular groove 28.
An annular projection 38 having the same cross-sectional shape as 8 is formed. The inside of the body part 35 has a hollow part 39 that communicates with the opening part 34.
and communicates with the inner hollow part 41 of the mounting neck 32 via the orifice 40.

The disk 31 is placed on an upper end plate 42 surrounding the upper opening 34 of the disk holder 33 with a gasket 43 in between. The free length l between the clamping parts 45 and 46 of the approximately C-shaped clamping member 44 made of a leaf spring or the like is smaller than the thickness l ₀ from the disk upper surface 47 to the lower surface 48 of the upper end plate, and the clamping member 44 is As shown in the figure, a disk 31 and a disk holder 3
3 and 3 are spread apart and attached to the circumferential edge of the overlapping state, the circumferential edge of the disk is compressed to the circumferential edge of the disk holder by sandwiching the gasket due to its elastic force. Since three or more such clamping members 44 are attached to the circumferential edge of the disk at equal angles, the force for pressing the disk against the disk holder is applied evenly over the circumference.

A plurality of rows of annular protrusions 49 and annular grooves 50 that engage with each other are formed on the lower surface of the gasket 43 and on the upper surface of the upper end plate of the disk holder on which the gasket is placed.

Next, the assembly procedure of the above-mentioned air diffuser will be explained. As shown in FIG. 5, a base frame 52 is connected by anchor bolts 51 embedded in the bottom of the aeration tank.
are fixed in multiple rows, and long holes 53 are formed in the base frame.
The mounting frame 55 is height-adjustably mounted using bolts 54, and the header pipe 20 is placed on the arcuate receiving portion 56 of the mounting frame 55, and the header pipe is secured by a band 58 tightened with bolts and nuts 57. 20 attached to the frame 55
Fix it on top. Depending on the size of the aeration tank, for example, about 80 header pipes of about 10 meters in length are laid in parallel and connected to connect to one or several air sources. Make it. Therefore, in order to reduce the pressure change between the front end and the rear end of the header pipe and to adjust the amount of air blown out, the restriction ratio of the orifice 40 is appropriately selected. The orifice 40 may be provided as 40' at the distal end of the neck, for example, as shown by the two-dot chain line. The lower cylindrical portion 24 of the elastic adapter 22 is inserted into the mounting holes 21 formed in the header tube thus arranged until the saddle portion 26 comes into contact with the upper surface of the header tube. Next, as shown in FIG. 4, the elastic adapter 2 is inserted into the mounting hole 21.
The neck 32 of the disk holder is inserted into the lower vertical hole 30 of No. 2 as shown by the arrow 59. The neck 32 has a right cylindrical shape, and the outer diameter d of the neck is the minimum diameter d ₀ of the lower vertical hole 30.
larger and smaller than its maximum diameter d ₁ . Desirably, the value is close to the maximum diameter _d1 . Therefore, when the neck portion 32 is press-fitted into the lower vertical hole 30, the lower vertical hole 3
0 is pushed out and the outer diameter of the lower cylindrical part 24 expands as shown by the two-dot chain line 24', and the outer diameter part is strongly pressed against the mounting hole 21, completing the seal at the mounting hole edge 21'. . In addition, since the outer diameter of the lower cylindrical portion 24 bulges beyond the inner diameter of the mounting hole 21, the adapter 22
is firmly fixed to the mounting hole 21, making it difficult to remove it from the mounting hole 21. Disk holder 33
In this case, the annular projection 38 provided on the body portion 35 is connected to the upper cylindrical portion 2.
the elastic adapter 22 until it engages with the annular groove 28 of 5.
Press it inside. Due to the engagement between the annular groove 28 and the annular protrusion 38, the disk holder 33 will not hold the elastic adapter 22 unless it is pulled upward with a fairly strong force.
There is no way to separate from it. The seal between the disk holder 33 and the elastic adapter 22 is perfect because the lower vertical hole 30 is in close contact with the neck 32.

The disk 31 is inserted into the upper end plate 4 of the upper opening 34 of the disk holder 33 before or after the disk holder 33 is press-fitted into the elastic adapter 22.
2 through a gasket 43, and is pressed against the gasket 43 by a plurality of clamping members 44, so that the end of the disk is completely sealed. A lower clamping part 46 of the clamping member 44 holds the disk holder 3.
Since the holding member 44 is engaged with the lower peripheral surface 48 of the disk holder by riding over the annular protrusion 60 provided on the peripheral edge of the disk holder, the holding member 44 will not come off in the radial outward direction due to vibration or the like. In order to prevent such radial dislodgement, the surface of the upper holding portion 45 that contacts the top surface of the disk 31 is knurled (grooved) in the circumferential direction.
Alternatively, a burr may be formed that protrudes outward. In order to prevent the clamping member 44 from shifting in the circumferential direction due to vibration etc., a plurality of notches 61 are formed radially on the outermost surface of the disk holder as shown in FIG. Part 4
4, the clamping part 46 of the clamping member 44 is inserted.
may be arranged so that it passes over the annular protrusion 60 on the lower surface of the holder.

The method of fixing the disk holder 33 to the elastic adapter 22 is to carve a male screw structure 62 on the outer surface of the body 35, as shown in FIG. A female screw structure 63 is provided on the inner peripheral surface of the upper vertical hole 29 of the adapter 22.
Alternatively, the two may be screwed together. In this case, if the body part 35 is formed into a tapered shape that widens upward, it is effective in preventing the screw from loosening. By employing such a screw structure, fitting of the neck portion 32 into the tapered vertical hole 30 becomes extremely easy.

According to the present invention, as described in detail above, a disk holder having an upward opening is attached to the gas supply pipe in a communicating manner, and the upper opening of the disk holder is closed by a disk having air permeability. In an air diffuser that releases compressed gas that has flowed into the disk holder from the ventilation pores of the disk into the external liquid as microbubbles, the air diffuser is fixed to the peripheral edge of the disk and disk holder to seal the disk and disk holder. A substantially C-shaped clamping member is installed between the mounting neck of the disk holder and the mounting hole drilled in the gas supply pipe, and the minimum inner diameter of the clamping member is the same as the outer diameter of the mounting neck. The outer diameter of the elastic adapter is expanded by fitting the mounting neck into the inner diameter of the elastic adapter inserted into the mounting hole, and the elastic adapter is inserted into the mounting hole. Since the air diffuser is characterized by fixing the disk holder in a sealed manner, simply fitting the mounting neck of the disk holder into the elastic adapter completes the firm attachment to the gas supply pipe, and when it is removed. However, it is not only necessary to pull out the disk holder with a slightly larger force, but it is not only extremely easy to install and remove, but it is firmly fixed and will not come loose due to vibrations, etc., and the edge of the mounting hole is Since it bites into the elastic adapter and performs a sealing action, even if the mounting direction of the elastic adapter is slightly misaligned, the seal around the mounting hole remains complete, and the clamping member directly presses the top surface of the disc's contact surface with the gasket. Complete contact with the gasket can be obtained without bending the disk or the disk holder, and the seal between the disk and the disk holder can be improved. In addition, the clamping member can be easily attached and detached, and does not come off easily due to vibrations, etc., so the assembly work can be speeded up, and loosening due to vibrations etc. does not occur.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a conventional air diffuser, Fig. 2 is an exploded perspective view of an air diffuser according to an embodiment of the present invention, and Fig. 3 is a front view showing the assembled state of the air diffuser. 4 is a front sectional view of a single elastic adapter that can be used in the aeration device, and FIG. 5 is a front sectional view showing the attached state of a gas supply pipe that can be used in the aeration device. , FIG. 6 is a perspective view showing one mode of attachment of a clamping member that can be used in the air diffuser, and FIG. 7 is a front cross-sectional view showing a modified example of the attachment structure of the disk holder to the elastic adapter. It is a diagram. 33...Disk holder, 20...Header pipe (gas supply pipe), 34...Top opening, 31...Disk, 43...Gasket (sealing material), 44...
...Holding member, 32...Mounting neck, 21...Mounting hole, d ₀ ...Minimum inner diameter, 22...Elastic adapter, 3
0... Inner diameter part, 26... Saddle part, 28... Annular groove,
38... Annular projection, 62, 63... Screw structure.

Claims (1)

[Scope of Claims] 1. A disk holder that opens upward is attached in communication with a gas supply pipe, the upper opening of the disk holder is closed with a disk having ventilation, and the gas supply pipe is connected to the inside of the disk holder. The diffuser releases the compressed gas that has flowed into the disk into the external liquid from the ventilation pores of the disk as microbubbles, which is fixed to the circumferential edges of the disk and disk holder, and connects the disk and disk holder with each other through a sealing material. A cylinder that is installed between a substantially C-shaped clamping member that is clamped in a sealing manner and a mounting neck of the disk holder and a mounting hole drilled in the gas supply pipe, and whose minimum inner diameter is smaller than the outer diameter of the mounting neck. By fitting the mounting neck into the inner diameter part of the elastic adapter inserted into the mounting hole, the outer diameter of the elastic adapter is expanded, and the elastic adapter and the disk holder are inserted into the mounting hole. An air diffuser characterized by being fixed in a sealed manner. 2. The air diffuser according to claim 1, wherein the inner diameter part of the elastic adapter has a tapered shape that expands upward. 3. The air diffuser according to claim 1, wherein the elastic adapter has a saddle portion on its outer periphery that comes into contact with the gas supply pipe. 4. The air diffuser according to claim 1, wherein an annular projection and an annular groove for accommodating the annular projection are formed on the fitting surface of the mounting neck and the elastic adapter. 5. The air diffuser according to claim 1, wherein a screw structure is formed on the fitting surface of the mounting neck and the elastic adapter.