JPH0213071Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vertical underwater agitator suitable for use in sewage treatment plants and the like.

There are various types of vertical underwater agitators used in sewage treatment plants etc. on the market, but in order to expand the agitation area, it is necessary to increase the size of the agitation blades or increase the motor horsepower. This increases the size of the device and increases the cost.

In view of the current situation, the present invention aims to expand the stirring area without increasing the size of the device and contribute to improving the capacity.An example of the implementation of the present invention will be described below with reference to the drawings.

1 is a device board, 2 is a plurality of devices (3 to 6 devices) on the board.
This is a guide tube that is erected via a support column 3 (of the order of 30 degrees). The upper and lower parts of the guide tube 2 are expanded into a fork-like shape, and a plurality of arm rods 4 (approximately 3 to 6 pieces) protrude toward the center within the upper part A, which will be described below. A pedestal 5 for stirring means is fixed. On the other hand, in the lower part B, a constant gap 6 is formed that is open toward the entire circumference of the base 1.

Reference numeral 7 denotes stirring means, and a motor 8 and a speed reducer 9 are attached from above to the pedestal 5 held by the arm rod 4, and a stirring blade is attached to the lower part of the pedestal 5 via a bearing case 10 equipped with a shaft sealing means. 11 is rotatably attached. Here, the stirring blade 11 is arranged horizontally at the center pinching position P of the guide tube 2, and the starting end of the stirring blade 11 starts at a position approximately half the distance between the tip and the center. In this structure, a blade 12 of a constant length is attached downwardly at the position so as to have a constant inclination angle θ with respect to the rotation direction A. Reference numeral 13 denotes an inner plate for forming a flow channel f in the guide cylinder 2, and is provided vertically from the pedestal 5 to above the starting end of the stirring blade 11.

Reference numeral 14 denotes a funnel-shaped bowl, which is fixed onto the base 1 so that the bottom surface a faces upward within the center of the stirring blade 11 and the expanded wall surface b faces downward. Therefore, the outer circumferential wall c surrounding the bottom part is formed so that a certain gap t is formed in the vertical direction inside the blade 12, and a large number of through holes 15 are bored around the bottom part a. It will be set up.

16 is a jet nozzle for compressed air to flow out into the bowl 14 at the center of the base 1; 17, 18 and 19 are air pipes and hoses for this purpose; It is connected to the compressor mounted on the

In the drawings, reference numeral 20 indicates a hanging fixture for suspending the entire apparatus in a stable horizontal state, and reference numeral 21 indicates a power cord.

The device of the present invention has the above-described construction, and when in use, it is suspended by a chain or the like above the bottom of a tank such as an aeration tank and lowered. Then, by switching on the power cord 20, the motor 8 is driven, and the rotation of the stirring blade generates a water flow in the direction of arrow B in the flow channel f. At this time, the device of the present invention simultaneously operates a separate compressor and blows it out into the bowl body 14 through the compressed air hose 19, air supply pipe 17, and nozzle 16, so that the compressed air inside the bowl flows into the upper part of the bowl body 14. The water is ejected from the through hole 15 from the inside to the outside of the stirring blade 11, that is, flows over the upper edge of the wall c, through the gap t between the stirring blade 11, and flows out toward the flow channel f. At this time, since the stirring blade 11 is rotated, the outflowing compressed air stream is cut by the blades 12 below the stirring blade 11 and dispersed in a finely divided state into the flowing water.

As described above, in this invention, as the stirring blade rotates, finely divided compressed air is ejected and mixed into the water channel, thereby forming a large convection current using the compressed air. In this way, it is possible to increase the number of people. This, in turn, can make the stirrer significantly larger compared to a stirrer of the same size and capacity. Specifically, for a 600 m ³ aeration tank, the conventional system required at least 5 to 6 units to be installed, but according to the present invention, it is now sufficient to install only 3 units.

[Brief explanation of drawings]

The drawing is a partially cutaway vertical sectional view of a vertical underwater agitator according to the present invention. 1... Device base, 2... Guide tube, 4... Bowl rod,
7... Stirring blade, 8... Motor, 9... Speed reducer, 11... Stirring blade, 12... Blade, 14
... Bowl body, 15 ... Through hole, 16 ... Nozzle, 17
...Air pipe.

Claims (1)

[Scope of utility model registration request] A guide tube is erected on the base so that a constant gap is formed with its lower part open toward the entire circumference of the base, and the motor, speed reducer, and stirring blade are arranged downward in this order from the top to the inside of the center. The blade part of the stirring blade is configured to start at approximately half the distance from the rotation axis to the inner wall of the guide cylinder, and a blade of a certain length is attached downward at the starting end, while a blade of a certain length is attached to the center of the base. The bowl body is fixed so that the bottom part a is upward and the expanding wall surface b is facing downward, and a certain gap is formed between the outer peripheral wall surface c surrounding the bottom part and the blade, and the other bottom part A has a large number of through holes, and a compressed air jet nozzle is installed inside the bowl body, and compressed air is introduced from the outside through the through hole in the upper part of the bowl body, through the gap between the blade and the flow channel. A rigid underwater agitator characterized by being designed to eject water toward the target.