JP2003181265A - Agitation apparatus of sewage treating tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitation apparatus of a sewage treating tank, which has a scum accumulation preventing function in itself without necessitating the installation of a separate scum removing equipment and by which sewage can be treated effectively at a low cost by circulating carriers efficiently. <P>SOLUTION: An agitator 2 is supported by a supporting body 1 in the sewage treating tank. A forked discharge bend 9 is extended from the peripheral part of an opening of a guide ring 6 and branched up and down to have a discharge port 10b opened upward and another discharge port 10a opened downward. A flap valve 11 turnable up and down freely while using the horizontal shaft 12 pivoted on the side wall of the bend 9 as a fulcrum is arranged in the bend 9. A holding angle of the valve 11 is adjusted optionally by managing a control lever installed on the outside of the bend 9. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring device in a sewage treatment tank. [0002] In a reaction tank for treating sewage,
In the stirring process, scum is generated and floats on the water surface to form a layer. And since a support | carrier is supplemented by the layer of scum and stirring is inhibited, the processing efficiency of sewage falls. Conventionally, as a countermeasure, scum is removed by a shower type defoaming apparatus S1 as shown in FIG.
Alternatively, it is necessary to separately install a dedicated device in addition to the stirring device, such as sucking out the scum by the pump S2 floated by a float as illustrated in FIG. 5, and a space for the installation must be secured. It also becomes a factor that increases initial cost and running cost. The object of the present invention is to eliminate the need for a separate scum removal device and to have a scum accumulation prevention function in the agitator itself so that the carrier can be circulated efficiently. An object of the present invention is to provide a stirring device in a sewage treatment tank in which effective sewage treatment is performed at a low cost. In the agitation apparatus in the sewage treatment tank according to the present invention, a sewage treatment tank is provided with a stirrer in which a propeller is fitted to the rotating shaft of a horizontal submersible motor and the outer periphery of the propeller is surrounded by a guide ring. A bifurcated discharge bend that is supported by an inner support and is extended forward from the mouth periphery of the guide ring and branched upward and downward to open an upward discharge port and a downward discharge port. A flap valve that can be pivoted up and down with the horizontal axis pivotally supported on the side wall of the bend as a fulcrum is installed in front of the propeller, and a horizontal axis operation lever is attached to the outside of the discharge bend. The holding angle was adjusted arbitrarily. If the internal flap valve is turned upward by the operation of the operation lever to close the flow path to the upward discharge port, only the flow path to the downward discharge port is opened. When the underwater motor is driven in this state, a downward water flow is generated by the rotation of the propeller, and the inside of the sewage treatment tank is agitated.
If the internal flap valve is turned downward to close the flow path to the downward discharge port, only the flow path to the upward discharge port is opened, and an upward water flow is generated, causing a scum diffusion action on the water surface. Thus, the carrier is easily circulated. After spreading the scum and turning the internal flap valve upward again to close the flow path to the upward discharge port, only the flow path to the downward discharge port is opened and sewage is generated due to the generation of downward water flow. The inside of the treatment tank is agitated. Also, if the holding angle of the internal flap valve is adjusted so that the flow paths to both the upper and lower outlets are opened in half, an upward water flow and a downward water flow are generated at the same time, diffusing the scum on the water surface. The inside of the sewage treatment tank will be stirred. As described above, effective or sewage treatment is performed by efficiently circulating the carrier by the alternating or simultaneous generation of the upward water flow and the downward water flow. Embodiments of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a support such as a guide pipe standing upright in the sewage treatment tank, and 2 denotes a propeller 5 fitted on the rotary shaft 4 of the horizontal submersible motor 3, and the outer periphery of the propeller 5 is surrounded by a guide ring 6. For example, the agitator is supported by being engaged with the support 1 by an engaging member 7 attached to the rear of the horizontal submersible motor 3, and is configured to be movable up and down by operating the suspension chain 8. Reference numeral 9 denotes a discharge bend that is provided by extending forward from the peripheral portion of the guide ring 6, and is formed in a forked shape having an upward discharge port 10b and a downward discharge port 10a by branching the extended portion up and down. ing. Reference numeral 11 denotes a flap valve installed in front of the propeller 5, which is rotatable up and down with a horizontal shaft 12 pivotally supported on the side wall of the discharge bend 9 as a fulcrum, and an operation lever attached to the outside of the discharge bend 9. (Not shown)
The holding angle is arbitrarily adjusted by this operation. For adjusting the holding angle of the internal flap valve 11, the operation lever may be operated by remote operation from above the water surface, or manually after the agitator 2 is pulled up to the water surface by operating the suspension chain 8. It may be done. The flow path to the upward discharge port 10a is closed,
When the horizontal submersible motor 3 is driven in the state of FIG. 1 in which the internal flap valve 11 is rotated upward so that only the flow path to the downward discharge port 10a is opened, a downward water flow is generated by the rotation of the propeller 5. Stir the inside of the sewage treatment tank. Next, in the state of FIG. 2 in which the internal flap valve 11 is rotated downward so that the flow path to the downward discharge port 10a is closed and only the flow path to the upward discharge port 10b is opened, an upward water flow is generated. Then, a scum diffusion action on the water surface is generated, and the carrier is easily circulated. After the scum is diffused, the flow path to the upward discharge port 10b is closed again, and the downward discharge port 1
Internal flap valve 11 so that only the flow path to 0a is opened
1 is rotated upward, the inside of the sewage treatment tank is agitated by the generation of a downward water flow. Further, if the internal flap valve 11 is held horizontally so that the flow paths to both the discharge ports 10a and 10b are opened in half, an upward water flow and a downward water flow are generated simultaneously. It is desirable that the holding angle of the flap valve 11 be adjusted as shown in FIG. 3 so that the flow path to the downward discharge port 10a is wider than the flow path to the discharge port 10b. As described above, effective or sewage treatment is performed by efficiently circulating the carrier by the alternating or simultaneous generation of the upward water flow and the downward water flow. According to the stirring device in the sewage treatment tank of the present invention, the stirring device itself has a scum accumulation preventing function,
Since effective sewage treatment is performed by efficiently circulating the carrier, there is no need to separately install a conventional scum removing device, and there is an advantage that initial cost and running cost can be significantly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view illustrating an operation mode of a stirring device in a sewage treatment tank according to the present invention, in which a flow path to an upward discharge port is closed and Only the flow path is opened. FIG. 2 is an explanatory view illustrating an installation mode of a stirring device in a sewage treatment tank according to the present invention, in which a flow path to a downward discharge port is closed and only a flow path to an upward discharge port is opened. Indicates the state. FIG. 3 is an explanatory view exemplifying an installation mode of a stirring device in a sewage treatment tank according to the present invention, showing a state in which flow paths to both upper and lower discharge ports are opened. FIG. 4 is an explanatory view exemplifying an installation mode of a stirrer in a conventional sewage treatment tank, and shows an example in which a shower-type defoaming device is additionally provided. FIG. 5 is an explanatory view exemplifying a conventional installation mode of a stirring device in a sewage treatment tank, and shows an example in which a scum suction device using a floating pump is additionally provided. [Description of Symbols] 1 Support 2 Stirrer 3 Horizontal submersible motor 4 Rotating shaft 5 Propeller 6 Guide ring 9 Discharge bend 10a Downward discharge port 10b Upward discharge port 11 Flap valve 12 Horizontal shaft

Claims (1)

What is claimed is: 1. A stirrer, in which a propeller is fitted to a rotating shaft of a horizontal submersible motor and the outer periphery of the propeller is surrounded by a guide ring, is supported by a support in a sewage treatment tank. Equipped with a bifurcated discharge bend that extends forward from the periphery of the mouth and branches upward and downward to open an upward discharge port and a downward discharge port, and the horizontal axis pivotally supported on the side wall of the discharge bend A flap valve that can be pivoted up and down as a fulcrum is installed in front of the propeller, and an operation lever on the horizontal axis is attached to the outside of the discharge bend so that the holding angle of the internal flap valve can be adjusted arbitrarily by operating the lever. It is characterized by
A stirring device in a sewage treatment tank.