JP3385047B2 - Water purification equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water area which is installed in a deep water area of a reservoir, a lake, or the like, and the water area is effectively purified by aeration and agitation of the water area. The present invention relates to a purifying device. 2. Description of the Related Art Conventionally, an air pump as shown in FIG. 2 has been used as a means for stirring a deep water area. This is because the air is blown into the air chamber 13 using a blower, and when the air chamber is filled with air, the air forms a lump of air and rises in the water pumping cylinder 12. Is discharged from the upper part of the pumping cylinder. [0003] In a system in which water is supplied from the bottom of the pumping cylinder by an air lift effect and discharged from the top, energy saving is relatively high, but the aeration and stirring capabilities are small, so that it is expected. There is a problem that a purifying effect cannot be obtained. An object of the present invention is to provide a purifying apparatus suitable for purifying a water area while aerating and purifying water in a deep water area having a depth of 3 to 5 m or more. SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and has a draft tube having a water intake port at the bottom and a discharge port at the top , both of which extend in the radial direction . Set the screw upward in the draft tube.
It includes a location the screw aeration machine, and a vent pipe for guiding the water of air in the negative pressure generating region of the screw tip, Dorafutochi
Draft after sinking by flowing down the surface from the outlet to the shore
The general circulation flowing toward the tube inlet and the draft
As soon as you exit the tube outlet, it sinks and drafts
The gist is that a small circulation that flows toward the suction port is formed so that aeration and stirring are performed simultaneously. The present invention utilizes both an air lift effect and a mechanical stirring force in order to increase the stirring and mixing action. A draft tube having a water suction port at the bottom and a discharge port at the top is provided with an upper float and a bottom. It is fixed with an anchor, and a screw-type aeration stirrer is provided in the draft tube, air on the water is supplied to the screw tip via a diffuser tube by a blower, and the rotation of the screw makes the bubbles finer and the draft tube By absorbing water from the bottom and discharging from the top, water in the water area is efficiently aerated and stirred to purify the water area. An embodiment of the present invention will be described below with reference to the embodiment shown in FIG. In the figure, 3 is a water inlet 3 at the bottom.
a, a draft tube having a discharge port 3b at the top, an anchor 7 at the bottom, and a float 4 at the top, fixed at a predetermined position in water. Both the water inlet 3a and the outlet 3b extend in the radial direction, so that water is absorbed from the periphery toward the draft tube in the bottom layer, and is discharged from the draft tube in all directions around the surface in the surface layer. In the draft tube 3, an aeration stirrer including a screw 1 and a submersible motor 2 is installed with the screw facing upward, and the ventilation pipe is fixed so that the discharge port of the ventilation pipe 6 comes to the tip of the screw. Is connected to the blower 5 and the diffuser 6. The installation position of the aeration stirrer varies depending on the length of the draft tube. However, in consideration of the efficiency of dissolving oxygen from aerated air into water, it is desirable to install the aerator at a depth of at least 3 m. Further, in this embodiment, the discharge port of the ventilation pipe is fixed so as to be located at the tip of the screw. However, the shaft of the screw 1 and the underwater motor 2 are made hollow, and the hollow shaft is formed below the underwater motor. It is also possible to connect the air diffuser 6. Next, the operation and operation of the present invention will be described. When the underwater motor 2 of the aeration stirrer is operated, the rotation of the screw 1 generates a negative pressure at the tip of the screw. The magnitude of this negative pressure depends on the motor capacity, the installation position of the screw, and the like. When the water depth is shallow, the air above the water is sucked through the ventilation pipe by the negative pressure without providing the blower 5 on the water. However, since it is affected by water pressure, the amount of air is very small even when supplying air. However, since such a negative pressure is generated, by applying a slight pressure with the blower 5, required air is supplied to the tip of the screw 1 through the ventilation pipe 6, and is sheared at the edge of the screw to produce fine air. It becomes bubbles. The suction port 3 at the bottom of the draft tube is caused by the rise of air bubbles and the upward flow by the screw.
From a, the water in the bottom layer is sucked and rises in the draft tube to generate a flow which is ejected radially from the upper outlet 3b. At this time, the water in the bottom layer has less dissolved oxygen,
Although it may be anaerobic depending on the conditions, the dissolved oxygen concentration increases due to contact with the fine bubbles in the draft tube. The water jetted from the outlet 3b of the draft tube causes a radial flow toward the shore on the surface layer. However, the water of the jetted bottom layer is usually lower and heavier than the surface water, so that the draft tube outlet is formed. After exiting the river, a stream that sinks can be formed. Therefore, as time elapses, it flows down the surface layer from the draft tube outlet to the shore and sinks, and the general circulation that flows through the surface toward the draft tube inlet in the center of the water body, and the water sinks as soon as it leaves the draft tube outlet. A small circulation returning to the draft tube inlet is formed. According to the present invention, a draft tube having a water suction port at the bottom and a discharge port at the top is fixed by an upper float and a bottom anchor, and a screw type aeration stirrer and a screw are provided in the draft tube. A vent outlet is provided in the negative pressure generation area at the tip, and air is supplied by a blower above the water to make bubbles finer at the screw edge.
It has the following effects. (1) Unlike a conventional air pump, a mechanical aeration stirrer is used, so that stirring can be performed continuously, and a large stirring effect can be obtained because of the use of an air lift function and a water flow by a screw. (2) While a conventional stirrer requires a torque to transfer only water, the present invention transfers a mixture of water and air, so the specific gravity is lighter than water and the transfer can be performed with a small torque. Can be (3) Since the entire water area is stirred and mixed, the entire water area can be maintained in an aerobic state, aerobic decomposition of organic matter is promoted, and generation of algae can be suppressed. Further, since the bottom mud is also aerobic, elution of nutrients from the bottom mud can be prevented, and the growth of phytoplankton can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment of the water purification apparatus of the present invention. FIG. 2 is an explanatory diagram of a known example. [Description of Signs] 1 Screw 2 Underwater motor 3 Draft tube 3a Water intake 3b Discharge 4 Float 5 Blower 6 Ventilation pipe

Claims (1)

(57) Patent Claims 1. A water inlet at the bottom, an outlet at the top, release both
A draft tube that extends in the shooting direction, a screw- type aerator that is installed with the screw facing upward in the draft tube, and a ventilation tube that guides air over water to the negative pressure generation region at the tip of the screw. Equipped, draft tube discharge
It flows down the surface from the mouth to the shore, sinks, and sucks a draft tube.
General circulation flowing toward the inlet and draft tube discharge
As soon as you open the mouth, it sinks into the draft tube suction port
A purifying apparatus for water bodies, wherein a small circulation that flows toward the water is formed to simultaneously perform aeration and stirring.