JP2001129588A - Air bubble excited flow type submerged aeration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the practical use of an aeration device capable of preventing the generation of a huge anoxic water mass braking a food chain in the bottom water layer of a closed water area, by jetting fine bubbles into a number of capillaries installed underwater, so that aeration and water flow generation are carried out at the same time. SOLUTION: A shelter 31, which is a device installed underwater for aeration, is composed of an air pump chamber 32, in which an air pump 38 for aeration and an air pump 34 for supplying the outside air are mounted, and an aeration chamber 33, which is partitioned into two of the upper and lower chambers by a partition wall 33a having a number of orifice pipe in it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to anoxic bottom water in closed water areas, which is not affected by wind waves on the water surface.
Also, the present invention relates to a device for performing air-airing in water so as not to hinder the navigation of a ship.

[0002]

2. Description of the Related Art A conventional energy saving type air supply system using an orifice pipe for directly supplying oxygen to bottom water has a mechanism mainly installed on a floating body above the water surface, and can be circulated by extending only a water intake duct to the water floor. It is like. (See, for example, Japanese Patent Application No. Hei 7-137351.) For example, as shown in FIG. 2, a mechanism of an air irradiating part is housed in an aeration tank 1 floating on the water surface by a buoy 7 of a floating body. In this mechanism, compressed air sent from an external air pump 8 is jetted out of the nozzle 6 provided in the nozzle header 3 as air bubbles, and airing occurs in the process of ascending in the orifice pipe 2 and at the same time, The function of flowing the water in the upper room from the lower room partitioned by the partition wall 1a, thereby sucking the hypoxic water in the bottom layer from the water intake duct 4 and discharging it to the outside by the drain duct 5. have. The feature of this device lies in energy-saving operation that generates air flow at the same time as air-earing using the rising power of bubbles.

[0003]

In the system of the bottom water layer air evaporation system as shown in FIG. 2, the main mechanism of the system is operated by floating above the water surface, so in a relatively wide water area such as a harbor or inland sea. However, there is a problem that the place where the device is installed is restricted in various ways because the wind wave is at the mercy of the ship or it obstructs the navigating ship. An object of the present invention is to devise a device which is not restricted by an installation place while making use of an energy saving principle which is a feature of the conventional technology.

[0004]

In order to solve the above-mentioned problems, according to the means of the present invention, all the mechanisms of the main part of the apparatus are installed underwater. FIG. 3 is a longitudinal sectional view when the device is installed underwater for easy explanation of the operation principle of the system. The configuration of the apparatus is an integrated shelter 10 having an air pump chamber 12 provided above an aeration chamber 11, and is submerged in water by a weight 19. At that time, a space in which air is stored is formed above the air pump chamber 12 and the aeration chamber 11. In this case, the height of the water surface a in the shelter is
Is adjusted by the outside air suction pump 20 so that the level becomes submerged. The inside of the aeration chamber 11 is vertically divided by a partition wall 14, and a water intake port 17 and a discharge port 18 are provided so that water can enter and exit from each compartment. A plurality of orifice pipes 13 each having a nozzle 15 for jetting air set at a lower portion thereof are attached to the partition wall 14, and are connected to an air pump 16 installed in the air pump chamber 12 by pipes. An outside air suction pump 20 is provided in the same air pump chamber 12, and has a structure in which the atmosphere can be taken into the shelter 10 from an outside air suction port 21 above the water surface. The air pump 16 and the outside air suction pump 20 are driven by a motor,
The power is supplied from a power source located on the water surface A.

[0005]

When the air pump 16 is operated, the air stored in the space inside the shelter 10 is sucked in, and bubbles are blown out from the nozzle 15 for jetting air into the orifice 13. The blown air bubbles rise in the orifice 13 with the surrounding water in contact with the air bubbles, generate a rising water flow, diffuse from the water surface a, and return to the space in the shelter 10 again. Aeration chamber 1
When an ascending flow is generated in 1, the oxygen-deficient water is sucked in from the water suction port 17, is aired from the water discharge port 18, and is discharged to the outside as oxygen-dissolved water. The outside air suction pump 20 uses the air inside the shelter 10 to dissolve into the water together with the air rate by using the outside air suction port 2 on the water surface A.
Air fresher than 1 is sent into the shelter 10.

The pressure of the air stored in the space in the shelter 10 corresponds to the water column head pressure corresponding to the depth h of the water surface a. In order for air bubbles to be ejected from the nozzle 15 by the air pump 16, h, the inner water surface a, and the height h to the nozzle tip
It is necessary to supply air having a pressure that is higher than the water column head pressure to which a is added and the water column head pressure α, which is higher by the force required for jetting. However, in this case, the pressure of the air sucked by the air pump 16 is equal to the pressure in the air pump chamber 12 corresponding to that of the water column head having the depth h. Power is water column ha
Only the additional pressure corresponding to + α.

This means that the magnitude of the power required for the bubble ejection is not related to the magnitude of h, that is, the depth h of the inner water surface a from the water surface A. Therefore shelter 1
It is a feature of the operating principle of this device that the amount of power for operating the air pump 16 does not depend on the installation depth, no matter how deep the installation depth is.

[0008]

FIG. 1 is a longitudinal sectional view of an embodiment. Shelter 3
1 is divided into two chambers, an air pump chamber 32 and an aeration chamber 33, between which air can freely flow. Shelter 3
1 is buoyant because of an air pocket formed inside, and is installed by the weight 22 in a state of floating near the bottom of a water area in an oxygen-deficient state. In that case, shelter 3
The air pressure is adjusted in advance so that the position of the water surface a in 1 is balanced at a fixed position. Since the height of the inner water surface a needs to be kept constant during operation of the device, the height is detected by the water surface sensor 23, and the inner water surface a is connected to the outside air suction port 35 floating on the water surface by the hose 35a. The air supply operation of the outside air suction pump 34 is controlled. The inside of the aeration chamber 33 is vertically divided by a partition wall 33a in which a number of orifice pipes 36 are set. A drain port 27 is provided in the upper room, and a water inlet 28 is provided in the lower room. Each of the orifice pipes 37 contains a nozzle pipe 36 for jetting air bubbles, and the air pump 3
8 and an air distribution pipe 39 and an air distribution header 39a.

When the air pump 38 operates, the pump chamber 32
The air inside is sent to a nozzle pipe 36 for ejecting bubbles in the orifice pipe 37 and is ejected as bubbles.
The jetted air bubbles rise around the inside of the orifice pipe 37 while attracting water around them while airing. The rising water flow generated at this time collects all the pipes and
The oxygen in the oxygen-deficient state is inhaled from the air, and the dissolved oxygen is added by the airation, and is sent out from the drain port 27. The jetted air bubbles are scattered from the inner water surface a into the aeration chamber 33, but move to the pump chamber 32 and re-enter the air pump 38.
Is again sucked into the nozzle pipe 36 and sent to the nozzle pipe 36 to be used for airation. As the air in the shelter 31 is repeatedly used for the eyelet as described above, a part of the air is dissolved in the water, and the air in the shelter 31 decreases and the height of the inland surface a increases. The water level sensor 23 detects the changing height of the inner water level a, and activates the outside air suction pump 34 to discharge fresh air from the outside air suction port 35 to the shelter 31.
And the height of the inner water surface a is kept constant.

[00010]

The power required for this device to function is the operating power of the air pump 38 and the outside air suction pump 34. Comparing the two operating powers, the air pump 38 requires an overwhelmingly large power. However, since the size is not related to the depth at which the shelter 31 is installed in the water, the power for ejecting bubbles from the nozzle pipe 36 is small enough to supply air having a pressure slightly higher than the atmospheric pressure in the shelter 31. Power is enough. Therefore, there is an effect that large-capacity air ration can be performed with small power even in the operation of a low-rise deep water layer.

For example, the water surface a in the shelter 31 has a water depth of 1
If the apparatus is installed at a position where the distance becomes 0 m, the water column head pressure in the shelter 31 becomes 1 atm. If the depth from the inner water surface a to the tip of the nozzle pipe 36 is 0.8 m, the air can be ejected if the air pressure sent from the air pump 38 is 1.1 atm. However, since the pressure of the air sucked by the air pump 38 is 1 atm in the air pump chamber, the power required to eject the bubbles is only required to increase the pressure by 0.1 atm. The power required for the pressure increase is determined by the depth from the inner water surface a to the tip of the nozzle pipe 36, and is not related to the depth at which the device is installed. Therefore, there is an effect that even aeration of an anoxic water mass at a deep water position can be performed with a small power.

Although the air pressure in the shelter 31 is high and the air density is high even in the air depth at a deep place, the discharge capacity of the air pump 38 is not changed. Has the effect of not falling. Further, the property that the rate of dissolution of air into water increases in proportion to the density also has the effect of providing conditions that are advantageous for air ration in a deep air with high water density.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a state in which a device installed in water is operating.

FIG. 2 is a longitudinal sectional view of a conventional device operating above the water surface.

FIG. 3 is a vertical cross-sectional view for explaining the operation principle of the underwater aireration device.

[Explanation of symbols]

 14, 33a Partition wall 17, 28 Water suction port 18, 27 Drain port 19, 22 Weight 20, 34 Outside air suction pump 21, 35 Outside air suction port 23 Water level sensor 35a Hose 36 Nozzle pipe 38 Air pump 39 Discharge pipe 39a Air distribution header h The height of the water column between the inner water surface a and the water surface A ha The height of the water column between the inner water surface a and the nozzle 6 α The height of the water column corresponding to the ejection pressure of the bubbles A Water surface a The inner water surface

Claims (2)

[Claims] 1. An aeration chamber 33 of a type in which air bubbles are ejected into a number of orifice pipes 37 to simultaneously generate air ration and a water flow, an air pump 38 for generating air bubbles and a pump 34 for supplying air. When the apparatus provided with the pump chamber 32 provided in one shelter 31 is installed at a position near the water bottom, air is confined in the upper part of the pump chamber 32 and the aeration chamber 33 so that an air chamber is formed. By using the trapped air in the air ration device, the size of the driving power of the air pump 38 for generating air bubbles is independent of the installation depth of the device. Underwater air evaporation device. 2. A water level detection sensor 23 is provided in an aeration chamber 33 so that the height of a water level a formed by air trapped in a shelter 31 can be detected. A mechanism which controls the operation of the pump 34 and functions so that the same amount of air as the air that dissolves into the water due to air replenishment is supplied from the atmosphere so that the height of the water surface a is always constant. (1) A bubble-excitation type underwater aireration device.