JPH0716592A - Aerator for reservoir, etc. - Google Patents

Abstract

PURPOSE:To increase the contact time between air and water, to improve the effect of aeration, and to utilize efficiently supplied air. CONSTITUTION:This aerator is composed of an internal air-water mixing cylinder 3 with both ends opened, an external air-water mixing cylinder 4 installed concentrically outside the mixing cylinder 3, an air-water separation cylinder 5 with a top 5A engaged on the external mixing cylinder 4, a water lead cylinder 6 bonded to the lower end of the external mixing cylinder 4 to form a opening 4B, a diffuser 7, a water discharge pipe 8 connected with the top 5 A of the separation cylinder 5, and an anchor. Compressed air is ejected from the bottom of the internal mixing cylinder 3; a part of the water-air mixture ascending in the cylinder 3 is made to descend countercurrentwise between the inner and outer mixing cylinders to generate a circulating current. Aerated water is discharged from the bottom of the separation cylinder 5 through a water outlet pipe 16 into a reservoir.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerator used for improving water quality in lakes, reservoirs such as dams, and ports.

[0002]

2. Description of the Related Art Various deep layer aeration systems have been proposed in order to activate deep layer water in dam reservoirs and the like. (See, for example, Japanese Patent Laid-Open No. 1-104396) This aeration device includes a gas-water mixing pipe having upper and lower ends opened,
From a toped air / water separation pipe provided outside of the pipe, an air diffuser arranged at the lower end opening of the mixing pipe, and an exhaust pipe connected to the top of the water / water separation pipe. The pond water is made to flow in from the lower end opening of the steam-water mixing pipe, and the water having the increased dissolved oxygen amount which is aerated from the lower end of the steam-water separating pipe is discharged.

[0003]

In the above-mentioned prior art, however, there is a problem that the length of the air-water mixing pipe must be increased in order to increase the contact time between water and air and enhance the aeration effect. is there. The present invention has been made in view of the above-mentioned actual situation, and the purpose thereof is to lengthen the contact time of air and water with the height of the water-water mixing tube being lowered, thereby improving the aeration effect. (EN) It is possible to provide an aeration device such as a reservoir that can be increased and can effectively utilize the supply air.

In the present invention, in order to achieve the above object,
The following technical measures were taken. That is, according to the present invention, a water / water mixing cylinder having upper and lower ends opened, a capped air / water separating cylinder externally fitted on the upper outside of the mixing cylinder, and a lower end opening portion of the mixing cylinder. It consists of an air diffuser provided and an exhaust pipe connected to the top of the steam / water separator, and water is introduced from the lower end opening of the steam / water separator to improve the water quality from the lower end of the steam / water separator. In the aeration device adapted to allow the water to flow out, a plurality of the air-water mixing cylinders are concentrically provided so that the upper ends of the outer sides are higher, and the upper ends of the outer mixing cylinders except the innermost mixing cylinder are reduced in diameter. The steam-water mixture descends and circulates between the inner mixing cylinder and the outer mixing cylinder.

[0005]

According to the present invention, when compressed air is discharged from the lower end of the steam / water separating cylinder by the air diffusing means, the air ascends inside the steam / water mixing cylinder and mixes / contacts with water. The water at the bottom rises along with the air, and the water and air are separated at the top of the air-water separation mixing cylinder, but at the upper end of the inner air-water mixture, part of the air-water mixture is It reverses and descends due to the diameter-reduced portion of the upper end of the water mixing cylinder, reaches the lower end of the inner steam-water mixing cylinder, flows into the innermost steam-water mixing cylinder again, and rises and circulates together.

Therefore, the contact time of air and water is doubled in proportion to the number of outside air-water mixing cylinders, and the aeration effect is significantly enhanced. On the other hand, the water flowing between the outermost steam / water mixing cylinder and the steam / water separating cylinder flows down in the steam / water separating cylinder and is discharged from the lower end outlet thereof into the middle or lower layer water. In this way, the water with the increased dissolved oxygen content is mixed with the pond water to supply oxygen, which is activated, that is, the water quality is improved. Then, the separated air accumulated in the top of the air / water separation cylinder and the exhaust pipe is automatically released into the atmosphere when the pressure becomes equal to or higher than a predetermined pressure.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which (1) is an aeration device provided at the bottom (2A) of the pond (2), which is an inner water / water mixing cylinder (3) with upper and lower ends opened. And an outer steam / water mixing cylinder (4) which is concentrically connected to the outside of the mixing cylinder (3) and whose upper and lower ends are open, and a concentric outer fitting to the outer upper part of the outer steam / water mixing cylinder (4). The connected top-and-bottom air / water separating cylinder (5) and its float (9A), the water guiding cylinder (6) and the air diffusing means (7) fixed to the lower end of the steam / water mixing cylinder (4), and the steam / water. An exhaust pipe (8) connected to the center of the top plate (5A) of the separation cylinder (5) and its float (9), a pressure reducing valve (10) provided at the upper end of the exhaust pipe (7), an anchor (11), and It consists of the anchor chain (12) and so on.

The inside air-water mixing cylinder (3) is a straight tube, and the water flowing from the lower end opening (3B) flows out from the upper end opening (3A) and is connected to the cylinder (3). The outer air / water mixing cylinder (4) is vertically longer than the both end openings (3A) and (3B) of the inner air / water mixing pipe (3),
The upper end opening (4A) is elevated by a height (H) from the opening (3A) and is curved in an arc shape toward the axis to form a reduced diameter portion (12), and the reduced diameter portion (13) is formed. ), Part of the rising water-water mixture is inverted and then lowered.

Further, the lower end of the outside air-water mixing cylinder (4) extends below the opening (3B), and the upper end flange (6A) of the water guiding cylinder (6) is fixed. A lower end opening (4B) of the outer steam / water mixture (4) is formed between (6A) and the lower end opening (3A) of the inner steam / water mixing cylinder (3).

A top plate (5A) of the air / water separating cylinder (5),
An air reservoir (14) is provided between the outer air-water mixing cylinder (4) and the upper end, and a ring-shaped connection is provided between the lower end of the air-water separating cylinder (5) and the outer air-water mixing cylinder (4). It is closed by a plate (15), a plurality of water outlet pipes (16) are connected to the connecting plate (15), and aeration water is discharged into the middle or lower layer water in the pond (2).

The water guiding cylinder (6) is for introducing deep-layer water into the steam-water mixing cylinder (3), has the same diameter as the inner steam-mixing cylinder (3), and has a lower end portion expanded in diameter to deep-water. Facilitates the inflow of. Further, an air diffuser box (7A) having the same outer diameter as the inner air-water mixing tube (3) is fixedly connected to the expanded diameter portion (6B) of the water guide tube (6), and the air diffuser box (7A). A large number of air diffusers (not shown) are provided on the upper surface of the air diffuser, and an air diffuser (7) is constituted by an air diffuser box (7A), an air supply pipe (7B), and a land compressor (not shown). .

The air diffuser box (7A) has an anchor (1
1) are connected by an anchor chain (12) and are placed on the pond bottom (2A). A float (not shown) is connected to the outside of the air / water separating cylinder (5) if necessary so that the entire apparatus (1) can be kept in a vertical state. Further, although not shown, the anchor (11) and the air diffusing box (7A) are connected to each other through a sheave by a wire rope, and one end of the wire rope is wound around a winch on land to thereby aerate aeration. The device (1) can be moved up and down.

According to the first embodiment, the aeration device (1) is fixedly fixed to the pond bottom (2A), and compressed from the land compressor into the air diffusion box (7A) through the air supply pipe (7B). When air is supplied, air becomes fine bubbles from the diffuser holes of the diffuser box (7A) and is ejected into the water guiding cylinder (6), and the air is accompanied by the surrounding pond water to form a mixture of steam and water inside. Ascend in the mixing cylinder (3).

The air / water mixture further rises from the upper end opening (3A) of the inner air / water mixing cylinder (3) to be separated into air and water, air is stored in the air reservoir (14), and water is stored in the outer air. After passing the upper end of the water mixing cylinder (4), it spreads in the radial direction and descends, descends in the steam separation cylinder (5), and is discharged from the water outlet pipe (16) into the pond (2).

Here, the water pressure difference due to the height (H) between the upper end opening (3A) of the inner air-water mixing cylinder (4) and the upper end opening (4A) of the outer air-water mixing (4) and the reduced diameter portion (13). ) By
A part of the air / water mixture tries to descend in the outer air / water mixing cylinder (4), and a negative pressure is generated in the lower portion of the mixing cylinder (4).
The inflow velocity of the downward precipitation from the lower end opening (4B) into the inner air-water mixing cylinder (3) is continuously added to the inner-outer water-water mixing cylinder (3),
Convection occurs between (4), and the aeration effect is promoted by the circulation flow.

At the upper end of the exhaust pipe (8), a pressure reducing valve (1
0) is provided, air is accumulated in the air reservoir (14) and the exhaust pipe (8), and when the pressure in the air reservoir (14) exceeds a set value, the pressure reducing valve (10) opens and air is discharged. The pressure in the reservoir (14) is maintained below a certain value, and the contact time between water and air is extended.

According to the first embodiment described above, since the steam-water mixture that has risen in the inner steam-water mixing cylinder (3) descends in the outer steam-water mixing cylinder (4), the steam-water contact time is doubled, The length of the air / water mixing cylinders (3), (4) can be shortened, and the aeration effect can be greatly enhanced. Then, deep aeration can be performed by fixing the aeration device (1) to the pond bottom (2A), and if the aeration device (1) can be moved up and down, it can be utilized as a pond water circulation control device. Further, oxygen can be supplied only to the salt water of the lower layer without mixing the fresh water and the salt water by installing the upper layer of fresh water and the middle and lower layers of salt water.

FIG. 2 shows the essential parts of a second embodiment of the present invention.
The difference from the first embodiment is that a second outer (intermediate) steam / water mixing cylinder (41) is provided between the inner steam / water mixing cylinder (3) and the outer steam / water mixing cylinder (4) to mix steam and water. The number of cylinders is three, and it is possible to cause convection (downflow) of the steam-water mixture between the steam-water mixing cylinders (3), (41), and (4). Furthermore, the air-water contact time can be extended, the aeration effect can be further enhanced, and the length of each air-water mixing cylinder can be shortened.

Since the second embodiment is the same as the first embodiment except that the second outside air-water mixing cylinder (41) is added, the same reference numerals as those in FIG. 1 are given and detailed description thereof is omitted. To do. The present invention is not limited to the above embodiment, but can be modified in design as appropriate.

[0020]

As described above, according to the present invention, in the aeration device in which the air / water mixing cylinder and the air / water separating cylinder are concentrically connected to each other, a plurality of the previous mixing cylinders are concentric and the outer upper end is high. The upper end of the outer mixing cylinder except the innermost mixing cylinder is reduced in diameter so that the steam-water mixture descends and circulates between the inner mixing cylinder and the outer mixing cylinder. Therefore, the contact time of air and water can be doubled in proportion to the number of air-water mixing cylinders, and the aeration effect can be greatly improved by effectively using the supply air, and the length of each mixing cylinder can be shortened. It is possible to reduce the total height.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional partial view showing a main part of a second embodiment of the present invention.

[Explanation of symbols]

 1 Aeration 3 Inner Air / Water Mixing Cylinder 3A Upper Opening 3B Lower Opening 4 Outer Steam / Water Mixing Cylinder 4A Upper Opening 4B Lower Opening 5 Air / Water Separation Cylinder 5A Top Plate 7 Diffuser 8 Exhaust Pipe 13 Reduced Diameter 41 Second Outer Water Mixing cylinder

Claims (1)

[Claims] 1. A steam / water mixing cylinder having upper and lower ends opened, a capped steam / water separating cylinder provided externally on the upper outside of the mixing cylinder, and a lower end opening of the mixing cylinder. The air diffusion means and an exhaust pipe connected to the top of the steam / water separation cylinder, inflowing water from the lower end opening of the steam / water mixing cylinder and flowing out water from the lower end of the steam / water separation cylinder. In the aeration device, the plurality of air / water mixing cylinders are concentrically provided so that the outer upper ends thereof are higher, and the upper ends of the outer air / water mixing cylinders except the innermost air / water mixing cylinder are reduced in diameter. An aerating device for a reservoir or the like, characterized in that the air-water mixture is structured to descend and circulate between an inner air-water mixing cylinder and an outer air-water mixing cylinder.