JP2007021319A - Aerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aerator where the generation of algae such as water bloom in the upper layer can be suppressed by effectively utilizing surplus air, further, scenery is not damaged, and maintenance cost can be reduced as well. <P>SOLUTION: The aerator 11 is moored to the bottom 1 of a lake such as a dam lake, and water in a layer in the vicinity of the lake bottom 1 is circulated by aeration. A cylindrical membrane member 25 bendable to vertical directions is provided, the lower end opening edge 25a of the cylindrical membrane member 25 is fixed to an aerator body 12 so as to surround the diffusion port 21 of surplus air formed at the upper part of the aerator body 12, further, the upper end opening edge 25b of the cylindrical membrane member 25 is provided with an opening-shaped holding frame 26, and, on the other hand, a winch 28 installed in a float 27 floating up on the water face is connected to the opening-shaped holding frame 26, and the opening-shaped holding frame 26 is vertically moved by the winch 28, thus the cylindrical membrane member 25 is bent to the vertical directions between the opening-shaped holding frame 26 and the aerator body 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an aeration apparatus for circulating water in a layer near a lake bottom by aeration.

  Conventionally, as shown in FIG. 4, there is an aeration apparatus 2 that is moored to a lake bottom 1 such as a dam lake and circulates water in a layer near the lake bottom by aeration (see Patent Document 1).

  The aeration apparatus 2 includes an aeration body 3 that is held in an upright state by buoyancy while moored on the lake bottom 1, and absorbs water into the inner cylinder 4 by an upward flow of aeration to increase the amount of dissolved oxygen. By draining water from the outlet 6 between the outer cylinder 5 to the outside (deep layer), anaerobic formation of the deep layer is prevented.

  In the aeration apparatus 2, the upper part (air reservoir) of the aeration body 3 and the exhaust valve 8 of the exhaust float 7 that floats on the water surface L 1 are connected by an exhaust hose 9 to exhaust excess air in the aeration body 3. The water in the upper layer of the aeration body 3 is prevented from being stirred by exhausting air from the hose 9 to the atmosphere via the exhaust valve 8.

For example, if the water depth M1 is 50 m, the aeration body 3 of the aeration apparatus 2 is set so that the water depth M2 is positioned near 20 m, and the length M3 of the exhaust hose 9 is about 30 m.
Japanese Patent Publication No. 7-10396

  However, in the background art, the surplus air in the aeration body 3 is always exhausted into the atmosphere, so the surplus air is completely wasted.

  Further, since the length M3 of the exhaust hose 9 is very long (about 30 m in the above example), when the water surface L1 (for example, water depth 50 m) falls to the water surface L2 (for example, water depth 30 m), it corresponds to about 20 m. As the exhaust hose 9 floats on the surface of the water, there is a risk of damage due to contact with the exhaust float 7, and the scenery deteriorates and the durability decreases due to direct sunlight for a long time. There was a problem that the maintenance and management costs such as replacement of the hose 9 increased.

  The present invention has been made to solve the above problems, and by effectively using surplus air, it is possible to suppress the generation of algae such as sea lions in the upper layer, and also to maintain maintenance costs without damaging the landscape. It aims at providing the aeration apparatus which can be reduced.

  In order to solve the above-mentioned problems, the present invention is an aeration apparatus that is moored at the bottom of a lake such as a dam lake and circulates water in the layer near the bottom of the lake by aeration, and is a cylindrical membrane member that can be bent in the vertical direction. The lower end opening edge of the tubular membrane member is fixed to the aeration body so as to surround the air outlet of the surplus air formed in the upper portion of the aeration body, and the opening shape is formed at the upper end opening edge of the tubular membrane member. While a holding frame is provided, a winch installed on a float that floats on the surface of the water is connected to the opening shape holding frame, and the opening shape holding frame is moved up and down by the winch so that the cylindrical membrane member is aerated with the opening shape holding frame. It is an object of the present invention to provide an aeration apparatus characterized in that it is bent vertically with respect to a main body.

  An inward folding portion may be formed in the tubular film member, and a movable weight that applies tension so as to remove the slack in the vertical direction of the tubular film member can be provided inside the inward folding portion.

  The float is preferably moored from the bottom of the lake so as to be positioned almost directly above the aeration body.

  According to the present invention, when the opening shape holding frame is moved up to the vicinity of the float with the winch, surplus air in the aeration body diffused from the air diffuser passes through the tubular membrane member and enters the atmosphere from above the water surface. Since it is exhausted, the water in the upper layer of the aeration body is not stirred.

  Further, when the opening shape holding frame is moved down to a predetermined water depth with a winch, the cylindrical membrane member is bent downward along with this, and excess air in the aeration main body diffused from the air diffuser is transferred to the cylinder. Since it is released into the water from the predetermined depth through the membrane member, water flows due to aeration in the upper layer between the water surface and the predetermined depth (circulation aeration and agitation), and excess air is used effectively By doing so, it becomes possible to suppress the generation of algae such as blue-green algae in the upper layer.

  Furthermore, since the tubular membrane member can be bent in the vertical direction, the tubular membrane member does not float on the water surface even if the water level is lowered, so there is no risk of damage due to contact with the float, and there is also a risk of damaging the landscape. In addition, since it is not exposed to direct sunlight, durability is improved and maintenance costs can be reduced. Moreover, since the tubular membrane member does not float on the water surface even when the water level is lowered, the aeration apparatus can be used for both the deep layer and the shallow layer.

  In addition, when a movable weight is provided inside the inwardly folded portion of the cylindrical membrane member, when the cylindrical membrane member is made of rubber or cloth, it is slack in the vertical direction by applying tension with the movable weight. Since the tubular membrane member does not float on the water surface even if the water level drops, there is no risk of damage due to contact with the float, there is no risk of damaging the landscape, and no direct sunlight. As a result, durability is improved and maintenance costs can be reduced.

  Further, when the float is moored from the bottom of the lake so as to be located almost directly above the aeration body, it is possible to effectively prevent the tubular membrane member from moving around together with the float and the float by wind force or water flow.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the aeration body 12 of the aeration apparatus 11 is provided with an outer cylinder 13 and an inner cylinder 14, and the inner cylinder 14 is fitted into the outer cylinder 13 to form a plurality of spaces. The lower flow path 16 is formed between the cir member 15 and the outer cylinder 13 and is fixed to the outer cylinder 13.

  A float 17 is attached to the outer periphery of the outer cylinder 13, and a downward cone-shaped portion 14 a is attached to the lower portion of the inner cylinder 14. The cone-shaped portion 14 a is attached to a sinker 18 installed on the lake bottom 1. They are connected by a chain or rope 19.

  Then, due to the buoyancy of the float 17, the outer cylinder 13 and the inner cylinder 14 become self-supporting in a substantially vertical state in water in a state where the chain 19 is pulled up by the connection length.

  The top of the outer cylinder 13 is formed in a hemispherical shape, and an air reservoir chamber 20 is formed between the upper end of the inner cylinder 14. Excess air from the air reservoir chamber 20 is submerged in the top of the outer cylinder 13. A diffuser port 21 is provided for aeration.

  When air is supplied to an aeration nozzle (not shown) via a hose 22 extending from a compressor chamber installed on the shore of a lake such as a dam lake, aeration (aeration) generated by this nozzle is transmitted from the cone-shaped portion 14a. It is supplied to the lower end opening of the inner cylinder 14.

  The aeration rises in the inner cylinder 14, and deep water is absorbed from the lower end opening of the inner cylinder 14 into the inner cylinder 14 by the upward flow of the aeration, and rises with the aeration. In this deep water, oxygen in the aeration dissolves in the process of rising with aeration. And the aeration discharged | emitted from the upper end part of the inner cylinder 14 to the inside of the outer cylinder 13 is stored in the air reservoir chamber 20, and is diffused into the water from the air diffusion port 21 as excess air (refer code | symbol a). become.

  Further, when deep water in which oxygen is dissolved is discharged from the upper end opening of the inner cylinder 14 into the outer cylinder 13 together with aeration, the upward flow is reversed to the downward flow, and the downward flow path between the inner cylinder 14 and the inner cylinder 14 By descending 16 and draining into the deep layer from the outlet 23 (see arrow b), anaerobic formation of the deep layer is prevented.

  On the other hand, a cylindrical film member 25 that can be bent in the vertical direction is provided. The cylindrical film member 25 is made of rubber, cloth, or rubber-drawn cloth that can be bent in the vertical direction, and does not require strict water shielding. Therefore, it is made of mesh-like metal or synthetic resin, or chain-knitted. It may be made of metal or synthetic resin.

  The cylindrical membrane member 25 is formed in a cone shape having a narrow lower end opening side and a wide upper end opening side, and the lower end opening edge 25a is formed on the aeration main body 12 so as to surround the air diffusion port 21 on the upper part of the aeration main body 12. While being fixed, an opening shape holding frame 26 is provided at the upper end opening edge 25b. The cylindrical film member 25 is not necessarily cylindrical, and may be a polygonal cylinder such as a square cylinder. Further, the opening shape holding frame 26 is not necessarily provided as long as the upper end opening edge 25b is cured and can hold the opening shape similarly to the opening shape holding frame.

  The aeration body 12 of the aeration apparatus 11 is set so that the water depth M2 is located in the vicinity of 20 m, for example, when the water depth M1 is 50 m, as in the background art, and the length of the cylindrical membrane member 25 in this case M3 is about 30 m. As shown in FIG. 1, the lower end opening side of the cylindrical membrane member 25 is folded inward by the inward folding portion 25 c, and thus is actually longer by the folding length.

  A float 27 that floats on the water surface L <b> 1 is provided, and an electric winch 28 is installed on the float 27, and a plurality of ropes 29 of the electric winch 28 are connected to the opening shape holding frame 26. The electric winch 28 can be driven forward and backward by remote control.

  Then, the rope 29 is wound up and rewound by forward / reverse driving of the electric winch 28, and the opening shape holding frame 26 is moved up and down so that the cylindrical membrane member 25 is located between the opening shape holding frame 26 and the aeration body 12. Will bend up and down.

  A ring-shaped movable weight (weight) 30 that provides tension so as to remove the slack in the vertical direction of the cylindrical film member 25 is provided inside the inwardly folded portion 25 c of the cylindrical film member 25.

  In the case of the aeration apparatus 11 having the above-described configuration, as shown in FIG. 2A, for example, when the water depth M1 is 50 m and the float 27 floats on the water surface L1 at this water depth M1, the electric winch. When the rope 29 is wound up by 28 and the opening shape holding frame 26 is moved up to the vicinity of the float 27, the cylindrical membrane member 25 is expanded in the vertical direction between the aeration body 12 and the float 27. As a result, surplus air in the aeration body 12 diffused from the aeration port 21 passes through the cylindrical membrane member 25 and is exhausted from the water surface to the atmosphere (see symbol a). Do not stir the water.

  Further, as shown in FIG. 2B, for example, when the water depth M4 is 40 m and the float 27 floats on the water surface L3 at the water depth M4, the rope 29 is rewound by the winch 28 to open the opening shape holding frame. 26 is moved down from the water surface L3 to a water depth M5 of 30 m, for example, by 10 m, the cylindrical membrane member 25 is bent downward along with this, and the surplus of the aeration body 12 diffused from the air diffusion port 21 Since the air passes through the cylindrical membrane member 25 and is discharged from the water depth M5 of 30 m into the water, a water flow (see arrow c) is generated by air diffusion in the upper layer between the water surface L3 and the water depth M5 (circulation). Aeration and agitation) and the effective use of surplus air makes it possible to suppress the generation of algae such as sea lions in the upper layer.

  Further, as shown in FIG. 2C, for example, when the water depth M5 is 30 m and the float 27 floats on the water surface L2 at this water depth M5, the rope 29 is rewound by the winch 28 to open the opening shape holding frame. 26 is moved downward from the water surface L2 to a water depth M6 of 20 m, for example, by 10 m, the cylindrical membrane member 25 is bent downward along with this, and from the air diffuser port 21 as in FIG. 2 (b). Since the excess air of the aerated main body 12 that has been diffused passes through the cylindrical membrane member 25 and is discharged into the water from the water depth M6 of 20 m, the water flow due to air diffusion (arrow c) is formed in the upper layer between the water surface L2 and the water depth M6. (See Fig. 1)) (circulation aeration and agitation), and effective use of surplus air makes it possible to suppress the generation of algae such as sea lions in the upper layer.

  Further, since the cylindrical membrane member 25 can be bent in the vertical direction, the cylindrical membrane member 25 does not float on the water surface even when the water level is lowered (L1 → L3 → L2). There is no risk of damage, there is no risk of damaging the landscape, and there is no exposure to direct sunlight, so durability is improved and maintenance costs can be reduced.

  Moreover, since the cylindrical membrane member 25 does not float on the water surfaces L1, L3, and L2 even when the water level is lowered, the aeration apparatus 11 can be used for both the deep layer and the shallow layer. For example, the aeration apparatus 11 for a shallow layer having a water depth M1 of 50 m to a shallow layer having a water depth M5 of 30 m (or a water depth M6 of 20 m) can be used.

  When the cylindrical membrane member 25 is made of rubber or cloth, a movable type that applies tension to the inside of the inward folded portion 25c of the cylindrical membrane member 25 so as to remove the slack in the vertical direction of the cylindrical membrane member 25. When the weight 30 is provided, the slack in the vertical direction of the cylindrical membrane member 25 can be surely taken. Therefore, even if the water level is lowered, the cylindrical membrane member 25 does not float on the water surface at all. There is no fear, there is no risk of damaging the landscape, and there is no direct sunlight, so durability is improved and maintenance costs can be reduced.

  Instead of providing the movable weight 30 inside the inwardly folded portion 25c of the cylindrical membrane member 25, as shown in FIG. 3A, an appropriate position in the vertical direction on the inner surface (or the outer surface is also acceptable) of the cylindrical membrane member 25. Further, a ring-shaped fixed weight 31 can be provided. By using the multistage fixed weight 31 to form the cylindrical film member 25 in a bellows shape, the cylindrical film member 25 can be bent in the vertical direction. Also, a large number of weights (iron balls and chain pieces) can be hung and attached to the inner surface and the outer surface of the cylindrical membrane member 25.

  Further, as shown in FIG. 3 (b), if the cylindrical membrane member 25 has a certain amount of weight as in the case of the chain braided metal as described above, the cylindrical membrane member 25 is slack in the vertical direction by its own weight. Therefore, the weights 30 and 31 are unnecessary.

  As shown in FIG. 1, when the float 27 is moored with a mooring rope 33 or the like from the bottom of the lake so that the float 27 is positioned almost directly above the aeration body 12, the cylindrical membrane member 25 together with the float 27 and the float 27 has the wind and water flow. Can effectively prevent moving around.

It is a side view of the aeration apparatus concerning the embodiment of the present invention. (A)-(c) is a side view of the aeration apparatus which shows the state of the cylindrical membrane member accompanying the change of the water depth. (A) is a side view of a cylindrical membrane member provided with a fixed weight, (b) is a side view of a chain membrane metal cylindrical membrane member. It is a side view of the conventional aeration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lake bottom 11 Aeration apparatus 12 Aeration main body 25 Cylindrical membrane member (tubular membrane member)
25a Lower end opening edge 25b Upper end opening edge 25c Inward turning portion 26 Open shape holding frame 27 Float 28 Electric winch 29 Rope 30 Movable weight 33 Mooring rope

Claims (3)

An aeration device that is moored to the bottom of a lake such as a dam lake and circulates the water in the vicinity of the bottom of the lake by aeration.
A cylindrical membrane member that can be bent in the vertical direction is provided, and the lower end opening edge of the cylindrical membrane member is fixed to the aeration body so as to surround an air diffuser of excess air formed in the upper portion of the aeration body, and the cylinder An opening shape holding frame is provided at the upper end opening edge of the membrane member, while a winch installed on a float floating on the water surface is connected to the opening shape holding frame, and the opening shape holding frame is moved up and down by the winch, thereby An aeration apparatus characterized in that a film-like film member is bent vertically between an opening shape holding frame and an aeration body.   An inward folding portion is formed in the tubular membrane member, and a movable weight is provided inside the inward folding portion to apply tension so as to remove the slack in the vertical direction of the tubular membrane member. The aeration apparatus according to claim 1.   The aeration apparatus according to claim 1, wherein the float is moored from a lake bottom so as to be positioned almost directly above the aeration main body.

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