JPH0460719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an aeration device used for sewage treatment and the like.

(Prior Art) Aeration purification is performed as a purification treatment for wastewater such as sewage and wastewater. That is, by blowing air from an aeration device installed in the aeration tank into the wastewater mixed with activated sludge stored in the aeration tank,
Wastewater is purified by oxidizing and decomposing the organic matter in the wastewater that has adhered or adsorbed to the activated sludge and absorbing it into the activated sludge. In this type of aeration purification, the efficiency of sewage treatment is determined by how widely and finely the air is dispersed in the aeration tank to allow it to come into contact with the sewage and dissolve oxygen in the air. It's summery.

Various aeration devices of this type have been devised in the past. For example, as shown in Figure 4, 20
has a hollow shaft 21 extending halfway up from the bottom, and has an opening 20a at the top end. The main body is made of synthetic resin and has a stepped shape, and the top of the shaft 21 has a stepped washer for holding a rubber disc, which will be described later. 22 are fitted,
Further, a groove 21a is formed into which a stopper 23 for holding the stepped washer 22 is inserted. 24 is a rubber disk having a hole 24a in the center, and is arranged on the upper part of the shaft 21 via the stepped washer 22, and is connected to the air chamber 2.
form 5. By the way, the rubber disk 24 is a flat disk before being installed, but its peripheral edge 24b is attached to the main body 2.
Since the central portion is pressed in the direction of arrow A by the stepped washer 22 so as to come into pressure contact with the opening 20a of 0, it is deformed into a shallow cup shape at the time of installation. The device supplies air to the air chamber 25 in the direction of arrow B through the vent hole 21b at the bottom of the shaft 21,
Sewage is treated by dispersing pressurized air from the pressure contact between the peripheral edge 24b of the rubber disk and the opening 20a of the main body. Note that the rubber disk 24 used in the device
uses a thick plate with a rubber thickness of approximately 6 mm in order to maintain durability in dirty water and the elastic force that presses the peripheral edge in the direction for a long period of time.

(Problems with the prior art) As mentioned above, in order to improve the efficiency of sewage treatment, it is necessary to diffuse air finely into the sewage water. The pressure contact force with the opening of the main body, that is, the force in the direction of arrow A that presses the center portion of the rubber disk in the axial direction, has a large influence on the air diffusion situation. In addition to increasing the dimensional accuracy of the groove 21a on the upper part of the shaft 21 that holds the part, the stepped washer 2
2. The stopper 23 and the like must also be made of parts with high processing precision. Moreover, regarding the rubber disk 24,
Sludge is deposited on the top surface, and as mentioned above, it is constantly pressed and deformed, so even if thick synthetic rubber material is used, it may become distorted or partially deformed over time. As a result, the air diffused from the periphery becomes uneven, which reduces the effect of the oxygen in the diffused air on oxidizing organic matter in the wastewater, resulting in a reduction in wastewater treatment efficiency.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned conventional drawbacks, and to not only achieve a high degree of aeration, but also to simplify the assembly of the members constituting the aeration device, and to reduce the occurrence of distortion of the members. Another object of the present invention is to provide an aeration device in which distortion and deformation have little effect on the generation of aeration.

(Summary of the Invention) The present invention has a cup-shaped upper main body, a cup-shaped lower main body having an air inlet approximately in the center, and a ring made of synthetic rubber, and each of the upper main body and the lower main body A peripheral part is provided on the outer periphery of the body to form a cavity through which air can flow out, and an air chamber is formed inside the upper main body and the lower main body by joining the upper main body and the lower main body at positions where the respective peripheral parts of the upper main body and the lower main body face each other. At the same time, by wrapping a ring around both peripheral parts and introducing air into the air chamber from the air inlet, air is diffused from the air at both peripheral parts against the elasticity of the ring. This relates to an aeration device.

(Example) Next, an example of the present invention will be described in detail using the drawings.

1 to 3 show an embodiment of the aeration system according to the present invention. In FIG. 1, 1 is a down pipe (riser pipe) whose one end is not shown, but is connected to a blower, and 2 is a riser pipe. A collecting pipe (header pipe) connected to the down pipe 1, 3 is the collecting pipe 2
The branch pipe 10 connected to the branch pipe 3 is an aeration device attached to the branch pipe 3, and is usually installed in an aeration tank containing activated sludge.

FIG. 2 is a cutaway perspective view of the main body of the aeration device 10, and 11 is a cup-shaped lower main body having a central axis 11a, which is a molded product of synthetic resin. The central shaft 11a is connected to the branch pipe 3 and receives pressurized air, so a screw 11b is provided at the lower end, and the shaft center is hollow to form an air inlet 11f to guide the pressurized air to the upper air chamber 12. It's summery. Lower body 1
A peripheral part 11d is provided on the upper part of the outer periphery of 1, and the peripheral part 11d is formed so that the upper surface has continuous wave-like unevenness. A protrusion 11e is provided in a protruding manner. 11c is a support part, and the lower main body 11
A recess is formed toward the outer circumferential direction from the upper center of the upper main body 13, and a recess is provided in the center to support a main shaft portion 13a of the upper main body 13, which will be described later.

Next, reference numeral 13 is an inverted cup-shaped upper main body molded from synthetic resin, and a peripheral part 13c is formed at the lower part of its outer periphery so that its lower surface has continuous wavy irregularities. Furthermore, a peripheral protrusion 13d is provided protruding from the entire circumference of the joint between the peripheral portion 13c and the inverted cup-shaped outer surface. Also, the main shaft portion 1 is used as the central axis of the upper main body 13.
3a is formed in a cylindrical shape, and when placed on the lower main body 11, the lower part of the main shaft part 13a is supported in the recessed part at the center of the support part 11c of the lower main body 11, and furthermore, the lower part of the main shaft part 13a is supported by the recessed part in the center of the support part 11c. The main shaft portion 13a and the support portion 11c are fixed together by the screw.
Next, between the main shaft portion 13a and the peripheral portion 13c,
A cylindrical portion 13b forming a concentric circle with the peripheral portion 13a around the entire circumference
is formed to open downward.
Therefore, the lower surface of the cylindrical portion 13b is supported by the upper surface of the outer peripheral portion of the support portion 11c, and the main shaft portion 13
Together with a, the upper main body 13 is stably held above the lower main body 11, and at the same time, the air chamber 12 formed by the upper and lower main bodies is protected against water pressure in dirty water.

Next, FIG. 3 is a partially cutaway perspective view of the annular ring 14 made of synthetic rubber.
are both peripheral parts 1 of the upper main body 13 and the lower main body 11
It is wound between the circumferential protrusion 13d and the circumferential edge 11e so as to cover the wavy unevenness of the protrusions 3c and 11d. As shown in the figure, the longitudinal section of the ring 14 has an arcuate outer surface and a protrusion 14a formed approximately at the center of the inner surface. During the winding described above, the protrusion 14a is held between the convex portions of the upper and lower peripheral portions 13c and 11d, and a space is formed between the concave portions and the convex portions of the upper and lower peripheral portions The protrusion of 13d and 11e prevents the ring 14 from coming off from both peripheral parts 13c and 11d.

Next, the upper main body 13, the lower main body 11,
To assemble the ring 14, first, the lower inner surface of the ring 14 is wrapped around the peripheral portion 11d of the lower main body 11. Next, while wrapping the upper side of the inner surface of the ring 14 around the peripheral part 13c of the upper main body 13, the upper main body is wrapped so that the lower part of the main shaft part 13a of the upper main body 13 fits into the recessed part at the center of the support part 11c. 13 is placed on the upper part of the lower main body 11, and the supporting part 1
If the main shaft part 13a is fixed with a screw from below the center of the support part 11c, the cylindrical part 13
The lower surface of b is in contact with the upper main body 13 and the lower main body 1
1 and are combined. Therefore, after assembly, the ring 14 is connected to the upper main body 13 and the lower main body 11.
Since it is supported between the convex portions of the circumferential protrusion 13d and the circumferential protrusion 11e by covering the concavo-convex portions of both peripheral portions 13c and 11d, an air chamber is formed inside at three points: the upper main body 13, the lower main body 11, and the ring 14. 12 will be formed.

To explain the operation of this embodiment with such a configuration, the pressurized air from the blower via the down pipe 1, the collecting pipe 2, and the branch pipe 3 passes through the air supply port 11f of the central axis 11a of the lower main body 11. The air is introduced into the air chamber 12. Next, the pressurized air filling the air chamber 12 resists the pressing force of the ring 14 from the outer circumferential direction of the upper and lower peripheral parts and the water pressure of the waste water in the aeration tank,
The air passes through the air in the recesses 3c and 11d, passes through the pressure contact with the ring 14, and becomes countless fine air bubbles that are diffused into the waste water. Therefore, this diffused air is ejected from the upper and lower parts of the entire circumference of the ring 14, and according to experiments, the solubility of oxygen in water in the diffused air is improved by about 20% compared to the conventional example described above. are doing.

Although the present invention has been described with reference to the above-mentioned embodiment, various modifications may be made within the scope of the gist of the present invention, such as making the peripheral portions of the upper and lower main bodies not wavy but straight, having an uneven shape, a sawtooth shape, etc. Modifications are possible, and these are not excluded from the scope of the present invention.

Further, in the above embodiment, when the ring 14 is wrapped around the outer periphery of the upper main body 13 and the lower main body 11,
If the upper part of the ring 14 is configured so as not to come into contact with the peripheral protrusion 13d, air bubbles diffused through the air in the concave part of the peripheral part 13c and through the pressure contact part with the ring 14 collide with the peripheral protrusion 13d. Because it will be necessary to
The bubbles become finer and the degree of aeration improves.

(Effects of the Invention) As described above in detail, the present invention comprises a cavity through which air can flow out around the upper main body and the lower main body constituting the air chamber, and the peripheral part is surrounded by a synthetic rubber ring. Because the air is wrapped around the ring, the pressure from the air is diffused into fine air bubbles from the entire circumference of the ring, which improves the solubility of oxygen in the air bubbles and purifies the waste water. Effect increases.

Next, in the present invention, the pressing force of the ring against both the upper and lower peripheral parts has little effect on the degree of aeration, and the simple structure does not apply strong load or pressure to the aeration-related members, so each member There is no need to increase processing accuracy, and the ring structure causes less distortion of the synthetic rubber ring. Note that even if the ring is distorted or deformed over time, the effect on air diffusion is small because the ring is dispersed over the entire circumference due to the ring shape.

Furthermore, since the synthetic rubber is ring-shaped, the amount used is small, and therefore the manufacturing cost is low.

Furthermore, the exterior and interior of this embodiment are vertically symmetrical, and the air bubbles and rings that emit diffused air are vertically symmetrical, so the entire device can be installed upside down in wastewater. However, it has almost no effect on aeration and can be installed over a wide range of areas. In addition to this, the ring is removable from the top and bottom, so
If the ring becomes old and corroded, you can easily replace it. Furthermore, since the protrusion of the ring is fitted into the gap between the peripheral parts, when the air pressure is low, the gap does not open completely and the blowout area becomes small, so the air outflow speed becomes faster and the air flows out. It mixes well with sewage.
Furthermore, when the air pressure is large, the protrusion is blown out from the gap due to this pressure, and air is blown out from the entire surface of the gap. This allows extremely efficient aeration.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the installed state of the aeration device according to the present invention, Fig. 2 is a broken perspective view of the upper and lower main bodies of an embodiment of the aeration device according to the present invention, and Fig. 3 is a perspective view of the ring. FIG. 4 is a partially cutaway perspective view of an example of a conventional aeration device. 10...Aeration device, 11...Lower main body, 11c
... Support part, 11d ... Peripheral part, 11e ... Peripheral convexity, 11f ... Air supply port, 12 ... Air chamber, 13
... Upper main body, 13c ... Peripheral part, 13d ... Peripheral convexity, 14 ... Ring.

Claims (1)

[Claims] 1 It has a cup shape and has an air inlet in the center top part to send pressurized air from the outside into the inside.
The opening periphery includes a lower main body having a periphery having a continuous uneven protrusion in the opening direction and a peripheral protrusion protruding in the radial direction of the periphery; The peripheral part has a continuous uneven protrusion and a peripheral protrusion protruding in the radial direction of the peripheral edge, and is fixed to the opening of the lower main body so that the uneven peripheral part is connected to the uneven peripheral part of the lower main body. The above-mentioned upper main body has an upper main body facing each other with a gap therebetween, and a protrusion that is sandwiched between the peripheral protrusion of the upper main body and the peripheral protrusion of the lower main body and fitted into the peripheral parts of the upper main body and the lower main body, and An aeration device comprising a flexible ring that closes a gap formed between two peripheral protrusions.