JPS5946656B2 - "Stir" stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an agitator, and more particularly to an agitator installed in a sludge digestion tank.

Conventionally, many of these types of stirrers were ones with stirring blades suspended in the liquid, rake-like stirrs, etc., which directly stirred the entire liquid in the tank, but in this case, the required power was low. In addition to being bulky, string-like objects, vinyl, paper, cloth, etc. were wrapped around the rotating parts, requiring a great deal of effort for maintenance.

As an improvement over these, a draft tube 1 is provided vertically in the tank, as shown in Figures 1 and 2.
A screw 9 attached to the tip of the shaft 2 is arranged inside the draft tube 1, and a splash disk 4 or a rectifying plate 5 is attached to the shaft above the screw 3. The sludge is sent upward or downward through the draft tube 1 by the rotation of the propeller 3, and the sludge coming out from above is diverted outward by the splash disk 4 or baffle plate 5. The scum is dispersed, moistening and softening the scum. The softened scum is sucked into the draft tube 1 by the reverse rotation of the scoop 9 and sent to the bottom of the tank. This prevents scum from accumulating on the liquid surface. However, with conventional agitators, the sludge is not sufficiently scattered, and the scum near the peripheral wall of the tank often remains unbroken, resulting in incomplete suction of the scum into the draft tube 1.
It was not possible to prevent the accumulation of scum on the liquid level, and the stirring effect was not satisfactory. This invention was made in view of the above circumstances, and it is possible to increase the amount of sludge scattered without increasing the stirring power, sufficiently moisten and soften the scum, and completely suck the scum into the draft tube. It is possible to reliably prevent the accumulation of scum on the liquid level, and
It is an object of the present invention to provide a stirrer that can greatly improve the stirring effect.

To achieve this objective, in the stirrer according to the invention, the shaft is provided with a specially designed curved cylinder for liquid splashing.

Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

In FIG. 3, a curved cylinder 14 for liquid scattering is provided on the shaft 12 above the screw 9 13.

A lower opening 15 of the curved cylinder 14 is concentric with the shaft 12 and faces the screw 13. Also, the upper opening 1
6 is placed horizontally. The curved cylinder 14 has a lower opening 1
The diameter gradually decreases from 5 toward the upper opening 16, and is fixed to the shaft with bolts and nuts at the cylindrical fixing part IT at the top. Note that the curved cylinder for liquid scattering is not limited to that of the above embodiment, and may have a plurality of upper openings. The other components of the stirrer are the same as the conventional one shown in FIG. That is, a starry unit 13 is attached to the lower end of the shaft 12, and this is arranged within the draft tube 11. The screw 13 and the curved cylinder 14 are rotated forward and backward by the operation of a rotating section installed on the top wall of the tank. Regarding the agitator with the above configuration,
When the screw 13 is rotated in the direction of arrow A shown in FIG. 3, the sludge is sent upward in the draft tube 11.
The liquid flows from the lower opening 15 into the curved cylinder 14 which exits from the tube 11 and rotates D1 on the liquid surface.

Then, the sludge is guided inside the cylinder 14 and is scattered outward to a far distance from the upper opening 16 by centrifugal force. As a result, a large amount of scum accumulated on the liquid surface, especially near the peripheral wall of the tank, is absorbed into the scattered sludge and is moistened and softened.
In this case, it is not necessary to constantly beat the accumulated scum on the liquid surface with the scattered sludge, and it may be done intermittently as long as the beating force is strong. After the scum is softened by the strong intermittent beating force, when the screw 13 is rotated in the opposite direction of arrow A, the softened scum is sucked into the draft tube 11 along with the sludge, and the screw 13 is rotated in the opposite direction of arrow A. 13 and sent out from the lower end of the draft tube 11 to the bottom of the tank. In this way, the entire sludge is efficiently stirred. The stirrer according to the present invention has the above-mentioned triplication (b), and the shaft 12 is provided with a curved cylinder 14 for liquid scattering, with the lower opening 15 facing the screw 13 and the upper opening 16 facing sideways. The sludge that rises in the draft tube 11 by the forward rotation of the screw 13 and enters the curved cylinder 14 for liquid scattering from the lower opening 15 is scattered far away from the upper opening 16 by centrifugal force. be able to.

As a result, the scum on the liquid surface is softened by the scattered sludge, and the reverse rotation of the screw causes the softened scum to become a draft.
It is sucked into the tube 11 and crushed by the screw. In this way, accumulation of scum on the liquid level can be reliably prevented, and the stirring effect can be greatly improved.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views of a conventional stirrer, and FIG. 3 is a longitudinal cross-sectional view of essential parts of a stirrer showing an embodiment of the present invention. 11...Draft tube, 12...
・Shaft, 13... Screw 1, 14...
...Curved cylinder, 15...Lower opening, 16...
...Top opening.

Claims (1)

[Claims] 1. A stirrer in which a shaft 12 is provided with a curved cylinder 14 for liquid scattering, with a lower opening 15 facing the screw 13 and an upper opening 16 facing sideways.