JP2619810B2 - Air intake device in aeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake device in an aeration apparatus for purifying sewage by sending air to the bottom of a sewage treatment tank for aeration.

[0002]

2. Description of the Related Art To reliably and efficiently aerate sewage in a sewage treatment tank, an air outlet for aeration is installed at a position as deep as possible in the treatment tank. It depends on how to send a large amount of air efficiently. Therefore, as shown in FIG. 7, the conventional air supply means includes an air intake port 6 on the peripheral side near the upper end of the air supply pipe 1 vertically installed from the upper layer of the sewage treatment tank 11 toward the bottom of the treatment tank 11. Is formed, and is operated from a sewage inlet 13 at an upper end of the supply line 1 by an operation of a stirring pump (or a stirring and aerator, hereinafter referred to as a stirring pump and corresponding to a reference numeral 15 in FIG. 1) attached to a lower end portion of the supply line 1. The air taken in from the air inlet 6 is sent to the downward flow of the sewage taken in, and is sent to the bottom of the sewage treatment tank 11 and blown out with stirring to perform aeration.

[0003]

However, the flow velocity distribution of the sewage in the air supply line 1 has the highest speed at the center of the line 1 when viewed in a horizontal section, and the flow rate distribution at the center of the line 1 is high. The slowest is the permeability of the flow.Therefore, it is most effective to blow air directly into the center of the fast flowing water to efficiently send air to deep water. In the inlet means, since the air intake port 6 is directly opened in the pipe wall of the air supply line 1, it is difficult to enter the fastest center of the flow of the sewage in the air supply line 1, and mainly the flow velocity near the pipe wall. Tend to get into the slower part of Accordingly, the rising speed of the bubbles is faster than the flow speed of the water at the pipe wall portion where the water flow is slow, so that the bubbles reversely float in the pipe against the water flow, so that the air supply efficiency is significantly reduced. In other words, the air that has floated in the reverse direction is not used effectively and is wasted, so that the efficiency is reduced. SUMMARY OF THE INVENTION The present invention addresses the above-described drawbacks of the prior art and aims to provide an air intake device capable of efficiently feeding a large amount of air to a deep water position.

[0004]

Means for Solving the Problems An air supply nozzle having an air outlet hole formed in the lower surface on the lower inner surface of a sewage suction port of an air supply pipe provided from the upper layer to the lower layer of sewage in a sewage treatment tank. And protruding non-intersectingly near the center of the air supply line,
A water hole is formed in the side wall of the air supply pipe just below the air supply nozzle.

[0005]

By rotating a submersible agitating pump attached to the lower end of the air supply line, a water flow is generated in the air supply line from the upper layer to the lower layer of the sewage, and near the upper end of the air line. By supplying air from the provided air intake, the air is blown from the fast center position of the water flow in the air supply line through the air supply nozzle, and the water flow hole formed in the pipe wall by the water flow in the air supply line Prevents bubbles from stagnating around the air supply nozzle by flowing water from inside to the water supply pipeline.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to FIGS. 1 to 6. An air supply pipe 1 is vertically provided from an upper layer toward a water bottom in a vertically long sewage treatment tank 11, and the air supply pipe 1 is provided.
A stirring pump 15 is installed at the lowermost end of the air supply pipe 1 through a U-shaped pipe 14, and the upper end of the air supply pipe 1 is
To form a donut-shaped cavity 2 larger than the outer diameter of
A plurality of air supply nozzles 4, 4,... Having an air passage leading to the cavity 3 of the cavity 2 are provided on the inner surface of the air supply line 1 at the center of the air supply line 1 so that their tips do not cross each other. It protrudes toward. That is, the air supply nozzles 4, 4,.
As shown in FIGS. 5 and 6, side plates 8 and 8 are stuck on both sides of a substantially U-shaped edge frame 9 to form a ventilation gap therein, and a plurality of lower edges 9 'of the edge frame 9 are provided. The air outlet holes 7, 7,... Are drilled downward, and are attached to the air supply line 1 so that the open portion of the edge frame 9 opens and communicates with the cavity 3. The air is supplied to the central portion of the main water flow as much as possible from the blowing holes 7, 7... Of the air supply nozzles 4, 4,.

On one outer side of the cavity 2, an elbow 5 provided with an attachment flange 6 at an outer end for connecting to an air supply device (not shown) such as a compressor protrudes. In the lower part of the cavity 2, the air supply nozzle 4
... water holes 10, 10, ...
In addition, the upper part of the cavity 2, that is, the upper end flange 12 of the air supply line 1
A sewage suction port 13 is provided continuously to generate a main water flow from the upper end of the air supply pipe 1 to the bottom of the treatment tank 11. The water passage holes 10, 10,... Are drilled close to and directly below the air supply nozzles 4, 4,.

Next, a series of operations of the above apparatus will be described. The submersible stirring pump 15 installed at the lower end of the air supply line 1
, Wastewater is taken in from the upper end suction port 13 of the air supply line 1, and a high-speed water flow (main water flow) is generated in the line reaching the submersible agitating pump 15. Compressed air generated by a compressor or the like is temporarily transferred to the cavity 3 of the cavity 2 as shown by the dotted arrow.
Each air supply nozzle 4, 4 connected to the cavity 2
.. Are blown into the high-speed water flow indicated by the solid arrows from the blowout holes 7, 7... The air sent from the air supply nozzles 4, 4,... In this way is supplied deep into the water bottom of the sewage treatment tank 11, but by projecting the air supply nozzle toward the center of the air supply line 1. The air can be guided to the center of the water flow, which is the fastest, and can be efficiently sent deep into the water bottom.

In addition, the fact that the air supply nozzle projects toward the center of the air supply line 1 in order to efficiently send air deep into the water bottom as described above is the same as placing an obstacle in a steady flow. As a result, a stagnation of the water flow occurs on the side (opposite side of the flow) of the obstacle (air supply nozzle) which is not opposed to the flow (main water flow). Over time, it grows and increases its buoyancy, eventually rising against the main stream. Therefore, the air bubbles which are going to stay around the blowout holes 7 on the lower surface of the air supply nozzles 4 are generated by the main water flow in the air supply line 1. Water holes 10, 1 from outside
0 is taken into the main water flow in the air supply line 1 by the secondary flowing water flowing inward through 0 ..., the stagnation is prevented, and all the air supplied by the compressor is efficiently transferred to the lower part of the sewage treatment tank. Can be sent.

[0010]

The present invention addresses the fact that it is extremely difficult to efficiently send air to a deep water position in a sewage treatment tank only by increasing the pressure of the supplied air. In a device that generates a high-speed water flow toward the water flow and guides bubbles to the bottom of the water, the air supply nozzle does not intersect toward the center of the air supply line
By projecting from the Jo, the water flow failure of the main water stream the central portion free
To the position where the main water flow is fastest in the air supply line.
In addition, the air can be blown, and the air can be more reliably sent to a deep water position.

[0011] Further, by forming a water flow hole directly below the air supply nozzle in the air supply pipe line, air bubbles which are likely to stay on the lower surface of the air supply nozzle are mainly discharged by the secondary flow water flowing into the pipe from the water supply hole. Since it is extruded into the water stream and guided to the lower part of the water, bubbles cannot be stagnated in the middle of the pipeline, and all can be sent to the water bottom.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an entire sewage treatment apparatus using the apparatus of the present invention.

FIG. 2 is an enlarged plan view of a main part of the above.

FIG. 3 is a front view of the same.

FIG. 4 is a right side view of the same.

FIG. 5 is an enlarged side view of a main part of FIG. 3;

FIG. 6 is a left side view of the same.

FIG. 7 is a partial longitudinal sectional side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air supply line 2 Cavity 3 Cavity 4 Air supply nozzle 7 Blow-out hole 10 Water passage hole 11 Sewage treatment tank

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-U 4-91799 (JP, U) JP-JP 2-39959 (JP, B2)

Claims (2)

(57) [Claims] An upper end opening of an air supply pipe provided between an upper part and a deep part of a sewage in a sewage treatment tank is defined as a sewage suction port.
And, the inner periphery of the lower the sewage inlet, one or a plurality of air supply nozzles bored blowing holes of the air to the lower surface, projecting positioned Then toward the center of the fed-duct to the non-cross-shaped Both
And a submersible agitating pump installed at the lower end of the air supply line. 2. An upper end opening of an air supply pipe provided between an upper part and a deep part of a sewage in a sewage treatment tank is defined as a sewage suction port.
And, the inner periphery of the lower the sewage inlet, one or a plurality of air supply nozzles bored blowing holes of the air to the lower surface, to project disposed toward the center of the fed-duct to the non-cross-shaped And one or a plurality of water holes are respectively formed at positions immediately below the air supply nozzles of the air supply line so as to generate side water. apparatus.