JP2557635B2 - Agitator for stored water - Google Patents

Description

TECHNICAL FIELD The present invention relates to an agitator for stored water for purifying the quality of water stored in a reservoir, a lake or the like.

[Prior Art] A large amount of water is stored in reservoirs, lakes and marshes (hereinafter simply referred to as "ponds"), and the surface of the water is exposed to the atmosphere. It is generally known that the surface water, the intermediate water, and the lower layer water hardly interchange with each other when focusing on the lower layer water and the middle layer intermediate water (see “Water and Wastewater”). Vol.27 No.8
(1985)).

When this phenomenon is illustrated and described in detail, as shown in FIG. 8, when the stored water (2) of the pond (1) is exposed to the atmosphere and the water surface (3) is irradiated with light from the sun (4), Water surface (3)
The surface water (5) in the vicinity is warmed. It has been confirmed by measurement that the surface water (5) has a thickness of, for example, about 10 cm, and the temperature may be warmed up to 25 ° C to 30 ° C depending on the season. This surface water (5) causes convection as shown by the arrow due to the temperature rise. Then
The middle layer water (6) below the surface layer water (5) also causes convection as shown by the arrow due to the temperature rise in the upper part. Due to the convection of the intermediate layer water (6), the upper layer temperature of the lower layer water (7) near the bottom surface (8) also rises in the same manner, causing convection as indicated by the arrow. Although the middle layer water (6) has a single layer in this figure, it may have a plurality of layers.

In this way, convection occurs inside each layer (5), (6), (7), but each layer (5), (6),
(7) Since no convection occurs between the stored water (2), no convection occurs as a whole. Therefore, the surface water (5) whose temperature has risen to 25 ° C to 30 ° C as described above is maintained at that temperature without being cooled. This temperature condition is suitable for the growth of blue powder (blue-green algae: called microalgae that breeds in stored water and collects the entire water in green). ) Breeds in large numbers, turning the entire pond green. Furthermore, since convection does not occur between the layers (5), (6), and (7), the middle layer water (6) and the lower layer water (7) in which oxygen from the water surface (3) is not sufficiently supplied are in an anaerobic state. Then, organisms in the water die and become so-called sludge (10) on the bottom surface (8) to be deposited. This anaerobic state is particularly remarkable in the lower layer water (7), and it is not rare that the oxygen content becomes almost zero.

The generation of blue powder and the phenomenon of sludge formation are currently becoming a major social problem in reservoirs and lakes in various parts of Japan, but they have reached the present day without finding an appropriate solution.
As one of the solutions, there is an agitator for stored water as shown in FIG. 9, for example. In this product, a pair of pipes (11a) and (11b) are vertically floated in the stored water (2) of the pond (1), and upper parts of the pipes (11a) and (11b) are connected to a communication pipe (11c). ), And connect one of these pipes (11
Air is supplied from the air supplier (12) to the inside of the lower part of a). Then, the supplied air becomes many bubbles B and rises in the pipe (11a). Due to the formation of the bubbles B, a rising water flow is generated in the pipe (11a). The water flow containing the bubbles B is passed through the communication pipe (11c) to the pipe (11c).
b) Move down. In this way, a water flow as shown by an arrow is formed, and oxygen can be supplied to the stored water (2) at the same time.

[Problems to be Solved by the Invention] However, in the conventional agitator for stored water as described above, since the water flow is generated by the bubbles B, the force of the water flow is weak and the water flow without the bubbles B is small. There was a problem that it was impossible to cause.

In addition, since air is discharged at a deep water location, there is a problem that high pressure air must be supplied, and that noise generated by the air supply device (12) is large.

Furthermore, since the distance between the pair of pipes (11a) and (11b) facing each other cannot be set large, there is a problem that it is difficult to stir over a wide range of the pond (1).

The present invention has been made to solve such a problem, and purifies the water quality by forming a large circulation path of the stored water and uniformly stirring the stored water over a wide range around the stirring device. An object of the present invention is to provide a stirrer of stored water that can be used.

[Means for Solving Problems] A stirred device for stored water according to the present invention is a floating part arranged floating in the stored water, and is attached to the floating part so as to face downward. A tubular portion having a supply / discharge opening for stored water and a water flow generating portion disposed inside the tubular portion for causing a downward water flow are provided, and the upper opening portion of the tubular portion has a lateral direction. It is formed over the entire circumference, and the lower opening of the tubular portion is formed over the entire lateral direction so that the circulating water flowing downward in the tubular portion is discharged radially in the horizontal direction.

In addition, another agitator for stored water according to the present invention is a floating portion which is arranged in a floating manner in the stored water, and is attached to the floating portion so as to face downward. A tubular portion having a portion formed therein, and a water flow generating portion disposed inside the tubular portion for generating an upward water flow, and the lower opening portion of the tubular portion is formed over the entire circumference in the lateral direction. The upper opening of the tubular portion is formed over the entire lateral direction so that the circulating water flowing upward in the tubular portion is discharged radially in the horizontal direction.

[Operation] In the present invention, a water flow generating portion that causes a downward (or upward) water flow is disposed inside the tubular portion, and the upper (or lower) opening portion of the tubular portion is entirely laterally arranged. It is formed over the entire circumference, and the lower (or upper) opening of the tubular portion is formed over the entire lateral direction so that the circulating water flowing downward (or upward) in the tubular portion is horizontally discharged radially. Since it is formed over a wide area, a strong downward (or upward) water flow can be generated in the tubular part, and the circulating water flowing in the tubular part vigorously radiates horizontally from the opening on the discharge side. After being discharged and flowing to a long distance, it flows into the tubular portion again from the opening on the inflow side, and a large circulation path of circulating water is formed around the stirring device.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The one shown in Fig. 1 is mainly used for deep aeration in a deep pond, and in the figure, (20) is a floating portion arranged suspended in the stored water (2). In the example, the colorfully colored float (20) is floating above the water surface (3). The float (20) includes a main body (20a) and a cover (20b) attached above the main body (20a), and the stored water (2) includes a main body (20a) and a cover (20b). The space (20c) between them can be freely accessed. Further, in the float (20), the whole stirring device floats above the water surface (3), the main body (20a) is submerged in water, and the lower part of the space (20c) is filled with the stored water (2). It is made of a material having a predetermined specific gravity. (twenty one)
Is a tubular part attached downward to the body (20a) of the float (20), and in this embodiment, a circular pipe (21) is fixed almost vertically downward. There is. The upper end (22) of the pipe (21) is open, and the upper end (22) and the space (20c) form an upper opening (23) formed over the entire circumference in the lateral direction. ,
The upper opening (23) has a function of supplying the stored water (2) into the pipe (21). (24) Pipe (21)
It is a lower opening for discharging the stored water (2) inside the apparatus to the outside of the apparatus, and in this embodiment, it is formed over the entire circumference in the lateral direction like the upper opening (23). Reference numeral (25) is a water flow generating section that is disposed inside the pipe (21) and generates a water flow in the vertical direction. In this embodiment, the motor (26)
And a propeller (27) that rotates by the power from this motor (26), and a mixer that causes a downward water flow as indicated by arrow A, for example, an underwater mixer is shown. The mixer may be of a type in which the motor is on the water surface. Furthermore, this underwater mixer (2
5) is provided with an air supply device (28) which is arranged in the pipe (21) and discharges air supplied from the outside on the suction side of the propeller (27). (29) is a valve for adjusting the discharge air amount. An anchor (30) is connected to the lower end of the pipe (21) by a chain (31) and regulates the lateral movement of the stirring device. A cable (32) is electrically connected to the motor (26) and is supported by a supporter (33) that floats above the water surface (3).

Next, the operation of the above-described embodiment configured as described above will be described. First, the anchor (30) is placed on the bottom surface (8) of the pond (1) so that the stirring device does not move from a predetermined position in the pond (1). Next, the motor (26) of the underwater mixer (25) is operated, and the propeller (27) is rotated by the power from this motor (26) to generate a strong downward water flow in the pipe (21), Open the valve (29) and supply air to the suction side of the propeller (27). Then, the stored water (2) flows inward from the entire outer circumference of the upper part (20a) of the float (20), enters the pipe (21) through the upper opening (23), and reaches the underwater mixer (25). By the supply of air and the rotating action of the propeller (27), the propeller (27) sucks in air, whereby the stored water (2) becomes a water flow containing a large number of bubbles B, and descends in the pipe (21). Lower opening (24)
It is discharged radially in the horizontal direction toward the entire circumference or in the horizontal direction, and is sucked again from the float (20) portion after a certain retention time has elapsed. The circulation path of such water flow is largely formed. This operating state is shown in FIG. 2 corresponding to FIG. 8, and the stored water (2) is generated by the circulating water flow generated by this device.
It is possible to cause a wide range of convection from the surface layer near the water surface (3) to the lower layer near the bottom surface (8) as a whole and around the stirring device. As a result, the stored water (2) is separated into the surface water (5), the middle water (6), and the lower water (7), so that the temperature of the surface water (5) rises and the blue powder (9) becomes It is possible to prevent the conventional problems such as breeding and sludge (10) accumulation as shown in FIG. In addition, since air is supplied into the water, it also serves as a self-cleaning function for water by aeration.
Since the water flow contains the bubbles B from the time when the water flow descends to the time when the water flow rises, the contact time between the bubbles B and the water becomes longer than in the conventional case, and oxygen in the air can be sufficiently dissolved in the water.
The vicinity of the bottom surface (8) also becomes aerobic, and the sludge (10) deposited on the bottom surface (8) is also decomposed and the purification of the pond (1) can be promoted.

In addition, since the lower opening (24) is formed in the lateral direction, it is possible to prevent sludge at the bottom of the pond and curling of soil.

By the way, most of the main body of this device is in water, and only the float (20) floats above the water surface (3) of the stored water (2), so even if this device is seen from the outside, it will be colored colorfully. Only the disk-shaped float (20) that has been opened will be visible, and the scenery of the pond and the surrounding atmosphere will not be impaired.

Next, FIG. 3 shows another embodiment, which is mainly used for surface agitation in a shallow pond. The propeller (27) of the underwater mixer (25) is arranged upward so as to generate a water flow to the arrow C). The upper opening (23) of the pipe (21) includes the space (20) of the float (20).
Install a separate water guide plate (23a) in c), and pipe (21).
The circulating water that has risen inside is horizontally discharged radially over the entire circumference in the horizontal direction. Therefore, in this embodiment, the stored water (2) is sucked into the pipe (21) from the entire circumference of the lower opening (24) in the lateral direction, and rises in the pipe (21) by the submersible mixer (25). Opening (2
After being discharged radially from 3) in the horizontal direction over the entire circumference in the horizontal direction, it stays for a certain period of time and is sucked again from the lower opening (24) to form a circulating water flow. Produce an effect. In addition, although this figure shows the case where the air supply device (28) is provided, the shallow pond (1)
In some cases, air supply is not necessary for the surface layer stirring in.

FIG. 4 shows still another embodiment of the present invention.
The case where the stirring device shown in FIG. 1 is arranged in the aeration tank (40) is shown. The stirrer in this embodiment will function as a blower and an air diffuser.

5 (a), (b), 6 (a), (b), 7th
The figures show the lower part of the tubular part (21), especially the lower opening (24).
FIG. 5 is a view showing the shape of the above, and if the lower opening (24) is formed over the entire circumference in the lateral direction as shown in FIGS. Radially discharged to. Further, as shown in FIG. 6 (a), the lower opening (24)
May be formed downward, but as shown in FIG. 6 (b), if the lower opening (24) is formed so as to be directed in one horizontal direction, this device can be brought close to the wall surface (50). In the case of arranging, it is convenient that the stored water (2) circulates throughout the tank (51). Further, as shown in FIG. 7, the tubular portion (21)
It is convenient that the lower opening (24) also rotates if the lower part of the lower part is configured to be rotatable around the pipe central axis as indicated by the arrow. In this case, the direction of the lower opening (24) may be upward as shown, but may be sideways or oblique.

In each of the above-described embodiments, the amount of air supplied from the air supply device (28) can be arbitrarily adjusted by the valve (29), so that a water flow can be formed even when air is not supplied, and thus, there is no bubble. Can cause water flow. Also, the installation work of this stirring device is not particularly necessary,
Furthermore, by moving the anchor (30), this stirring device can be moved to any place, which is extremely convenient. Further, the lifting operation of the device for checking the device can be easily performed. Furthermore, since this agitator floats in water and causes an environmental water flow, the agitator can be operated with a small amount of power, requires little power cost, and does not generate noise. Further, since the air shown in FIG. 1 supplies air near the water surface (3), air having a low pressure may be used, and the power cost for air supply can be reduced.

In each of the above-described embodiments, the case where the float (20), which is the floating portion, floats above the stored water (2) has been described, but the float (20) is immersed below the water surface (3). Even in such a case, the same effect as above can be obtained.

Further, in the above description, the tubular portion (21) has shown the case where a circular pipe is used, but other than the circular shape, for example, a triangular shape, a quadrangular shape, another polygonal shape, an elliptic shape, or another irregular shape may be used. By setting the length of the tubular portion (21) to a predetermined dimension in accordance with the depth of the stored water (2), this device can be applied to stored water of various depths.

[Effects of the Invention] As described above, according to the present invention, the stirring device is floated in the stored water, and the water flow generating portion for generating the downward water flow is disposed inside the tubular portion having the openings formed in the upper and lower portions. The upper opening of the tubular part is formed over the entire circumference in the horizontal direction, and the lower opening of the tubular part is completely opened in the horizontal direction so that the annular water flowing downward in the tubular part is horizontally discharged radially. Since it is formed over the circumference, a large circulation path for the stored water is formed, and it becomes possible to stir the stored water evenly over a wide area around the stirrer, preventing the generation of blue powder and sludge formation, and improving the water quality. There is an effect that can be purified. In particular, since the warm and oxygen-rich surface water near the water surface is supplied downward, the anaerobic state of the water below is eliminated, which is effective in preventing sludge formation.

Further, in the case of a structure in which the water flow generation part causes an upward water flow inside the tubular part, the lower opening part of the tubular part is formed over the entire circumference in the lateral direction, and the upper opening part of the tubular part is tubular. Since the annular water flowing upward in the part was formed over the entire circumference in the horizontal direction so as to be discharged radially, a large circulation path for the stored water was formed, and it was uniform over a wide area around the stirring device. Since the stored water can be agitated, the water quality can be purified by preventing the generation of blue powder and sludge formation. In particular, since the cold water below is supplied to the vicinity of the water surface, the temperature of the surface water is lowered while being stirred, and the generation of blue powder can be prevented.

[Brief description of drawings]

FIG. 1 is a front sectional view of a stirrer showing an embodiment of the present invention, FIG. 2 is an explanatory view showing a state in which the stirrer is similarly installed in a pond (1), and FIG. 3 is another embodiment of the present invention. FIG. 5 (a) is a front sectional view corresponding to FIG. 1 showing an example, and FIG. 4 shows still another embodiment of the present invention, showing the state in which this device is installed in the aeration tank (40). ) Is a front view showing the shape of the lower portion of the tubular portion (21) according to the present invention, and FIG.
Fig. 6 (a) is a perspective view, Fig. 6 (a), (b), and Fig. 7 are front views corresponding to Fig. 5 (a), respectively, and Fig. 8 is conventional stored water (2) in a pond (1). 2) corresponding to FIG. 2, and FIG. 9 are illustrations showing a conventional stirring device. (2) …… Reserved water, (20) …… Float, (21) …… Tube (pipe), (23) …… Upper opening, (24) …… Lower opening, (25 ) …… Water flow generator (mixer), (26) …… Motor, (27) …… Propeller, (28) …… Air supply device. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

(57) [Claims] Claims: 1. A floating part which is suspended in stored water, a tubular part which is attached to the floating part so as to face downward, and in which upper and lower parts of the floating part are respectively formed supply and drain openings of stored water. The tubular part is provided inside, and comprises a water flow generating part for generating a downward water flow, the upper opening of the tubular part is formed over the entire lateral direction, and the lower opening of the tubular part is An apparatus for stirring stored water, characterized in that the circulating water flowing downward in the tubular portion is formed over the entire circumference in the horizontal direction so as to be discharged radially in the horizontal direction. 2. A floating part which is floated in the stored water, a tubular part which is attached to the floating part so as to face downward, and in which a stored water supply / discharge opening is formed in the upper part and the lower part, respectively. The tubular part is provided inside, and comprises a water flow generating part for generating an upward water flow, the lower opening of the tubular part is formed over the entire circumference in the lateral direction, and the upper opening of the tubular part is An agitating device for stored water, characterized in that the circulating water flowing upward in the tubular portion is formed over the entire circumference in the horizontal direction so as to be discharged radially in the horizontal direction.