JP3088089B2 - Nozzle structure of diffuser tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle structure of a diffuser pipe of an aeration tank in a wastewater treatment apparatus or the like.

[0002]

2. Description of the Related Art An aeration tank in a wastewater treatment apparatus is provided with an air diffuser for blowing air into wastewater. The air diffuser is provided with nozzle holes having a diameter of, for example, about 14 mm at appropriate intervals. The air sent to the air diffuser blows out from the nozzle hole into the wastewater, and is aerated.

[0003]

However, since calcium ions are often dissolved in wastewater,
It gradually precipitates around the nozzle hole, deposits as a water-insoluble salt (calcium carbonate), and is inevitable to block the nozzle hole.

[0004] When the number of nozzle holes whose diameter is reduced due to the deposition of calcium carbonate increases or the nozzle holes are completely closed, aeration becomes uneven and the efficiency of wastewater treatment decreases. become.

SUMMARY OF THE INVENTION Under such a background, an object of the present invention is to provide a nozzle structure of an air diffuser tube which can prevent the nozzle hole of the air diffuser nozzle hole from being closed for a long period of time while being a simple improvement. It is assumed that.

[0006]

According to the present invention, there is provided a nozzle structure of a diffuser tube, wherein a metal short pipe is provided in a nozzle hole (2) of a diffuser tube (1) of an aeration tank.
(3) is attached, and a flexible short pipe (4) is fitted on the short metal pipe (3) so as to extend from the short metal pipe (3).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

In the present invention, first, a diffuser pipe of an aeration tank
Attach the short metal tube (3) to the nozzle hole (2) in (1).

The inner diameter of the short metal tube (3) is made as large as the diameter of the nozzle hole (2) of the air diffuser (1) so as not to form a blind spot. For example, when the diameter of the nozzle hole (2) is 14 mm, it is preferable to use a short metal tube (3) having an inner diameter of about 15 to 19 mm.

The short metal tube (3) is usually made of SUS, and the diffuser tube (1) is attached around the nozzle hole (2) by welding.

The length of the short metal tube (3) is 1 to 5 times its inner diameter.
It is usually about twice, especially about 2.3 to 3.0 times.
For example, when the inner diameter of the short metal tube (3) is 15 mm,
Its length is about 15 to 75 mm, especially about 35 to 45 mm.

A short metal tube (3) is inserted into the nozzle hole (2) of the air diffuser (1).
After attaching the flexible short tube (3), a flexible short tube (4) is fitted over the short metal tube (3) so as to extend from the short metal tube (3).

As the material of the flexible short tube (4), rubber, elastomer or soft resin is used. One of the preferable ones is a candy-colored transparent rubber commonly referred to as candy rubber.

The inside diameter of the flexible short tube (4) is
(3) The diameter should be such that it can fit outside. The length of the flexible tube (4) is preferably about 1.5 to 3 times, especially about 1.7 to 2.3 times the length of the short metal pipe (3). For example, when the length of the short metal tube (3) is 30 mm, the length of the flexible short tube (4) is 4 mm.
It is about 5 to 90 mm, especially about 50 to 70 mm. If the length of the flexible short tube (4) is too short, the effect of preventing occlusion is poor, while if it is too long, aeration may not be performed smoothly.

The fixing of the flexible tube (4) to the short metal tube (3) is usually carried out by banding, but can also be carried out by winding and tightening a wire. Flexible short tube (4)
May be fitted to the base of the short metal tube (3) and then fixed, or may be fitted slightly above the base of the short metal tube (3) and then fixed. Then, a flexible short tube is attached to the short metal tube (3).
With the (4) attached, the flexible short tube (4) extends from the distal end of the short metal tube (3) by 1 to 3 with respect to the inner diameter of the flexible short tube (4).
It is preferable to extend the length by a factor of 2, especially 1 to 2 times.

<Operation> In the nozzle structure of the diffuser tube of the present invention, a metal short tube is inserted into the nozzle hole (2) of the diffuser tube (1) of the aeration tank.
(3) is attached, and a flexible short pipe (4) is fitted on the short metal pipe (3) so as to extend from the short metal pipe (3). , Diffuser
(1) The flexible short pipe (4) vibrates due to the force of the air blowing out,
Even if calcium carbonate is deposited or foreign matter adheres to the tip side, the deposits and deposits are washed off at the initial stage and do not accumulate.

Therefore, the nozzle hole (2) of the air diffuser (1) is prevented from being clogged for a long period of time, and power is saved by increasing the air diffusion efficiency, and sludge deposited on the tank bottom is reduced.

[0018]

The present invention will be further described with reference to the following examples.

Embodiment 1 FIG. 1 is an explanatory view showing an example of a nozzle structure of an air diffuser according to the present invention. FIG. 2 is an enlarged view of a main part of FIG.

In FIG. 1, (1) is an aeration tube of an aeration tank, and the aeration tube (1) is provided with a number of nozzle holes (2) having a diameter of 14 mm (256 per nozzle).

A metal short tube (3) made of SUS having an inner diameter of 15 mm, an outer diameter of 21.7 mm and a length of 30 mm was attached to each of the nozzle holes (2) of the air diffuser (1) by welding.

A flexible short tube made of candy rubber (4) having an inner diameter of 20 mm, an outer diameter of 28 mm and a length of 60 mm is prepared, and this is a metal short tube.
(3) was externally fitted to a position about 5 mm from the base, and fixed firmly with a band (5). Flexible short tube (4)
Extends about 35 mm from the tip of the short metal tube (3).

As described above, the metal short pipe (3) is attached to the nozzle hole (2) of the air diffuser (1), and the flexible short pipe (4) is fitted to the metal short pipe (3). However, conventionally the nozzle hole
(2) The degree of occlusion is 256 on average in one year, 4
In the same period, the number of occlusions was 0 to 60%, the degree of occlusion was 90% or more, and the total occlusion was 64, whereas the degree of occlusion remained at an average of 5 to 10% for 256 during the same period, None of them had an occlusion degree exceeding 30%. For The variation in aeration efficiency of the aeration tube (1) is small, it was able to send the air almost constant power over a long period of time.

[0024]

As described in the section of operation, in the nozzle structure of the diffuser according to the present invention, the short metal pipe (3) is attached to the nozzle hole (2) of the diffuser (1) of the aeration tank. In addition, since the flexible short pipe (4) is externally fitted to the short metal pipe (3) so as to extend from the short metal pipe (3), the air diffusion pipe (1 ) The flexible short pipe (4) vibrates due to the force of the air blowing out, and even if calcium carbonate deposits or foreign matter adheres to the distal end side, the deposits and deposits will be removed at the initial stage. They are paid off and do not accumulate.

Therefore, the nozzle hole (2) of the air diffuser (1) is prevented from being clogged for a long period of time, and power is saved by increasing the efficiency of air diffusion, and sludge deposited on the tank bottom is reduced.

The present invention as described above is a simple improvement, yet reliable and for a long time, of the nozzle hole of the air diffuser (1).
This is practically extremely useful because it can prevent the blockage of (2).

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a nozzle structure of an air diffuser according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 (1) ... diffuser tube, (2) ... nozzle hole, (3) ... short metal tube, (4) ... flexible short tube, (5) ... band

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Kataoka 2-35 Kandacho, Ogaki-shi, Gifu Japan Synthetic Chemical Industry Co., Ltd. Ogaki Plant (72) Inventor Toshihiro Kawase 2-35 Kandacho, Ogaki-shi, Gifu address Nippon synthetic chemical industry Co., Ltd. Ogaki in the factory (56) reference Patent flat 10-235390 (JP, a) (58 ) investigated the field (Int.Cl. ^7, DB name) C02F 3/20 B01F 3/04

Claims (2)

(57) [Claims] 1. A metal short pipe (3) is attached to a nozzle hole (2) of an aeration tank (1) of an aeration tank, and further extends from the metal short pipe (3) to the metal short pipe (3). Of the diffuser tube having a structure in which the flexible short tube (4) is fitted to the outside as described above. 2. The length of a short metal tube (3) is 1 to 5 times its inner diameter, and the length of a flexible short tube (4) externally fitted to the short metal tube (3) is short. 1.5 to 3 times the length of the tube (3), and a short metal tube with the flexible short tube (4) fitted over the short metal tube (3)
2. A nozzle structure for a diffuser tube according to claim 1, wherein the flexible short tube extends from the tip end of the flexible short tube by 1 to 3 times the inner diameter of the flexible short tube. .