JPS5946655B2 - "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 had stirring blades suspended in the liquid, or rake-like stirrers, which directly stirred the entire liquid in the tank, but in this case, the power required was large. In addition, string-like materials, vinyl, paper, cloth, etc. were wrapped around the rotating parts, requiring a great deal of effort for maintenance.

As an improvement to these, as shown in Figures 1 and 2, a draft tube 1 is provided vertically in the tank,
A screw 3 attached to the tip of a shaft 2 is disposed 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. By the reverse rotation of the screw 3, the softened scum is sucked into the draft tube 1 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.As a result, the suction of the scum into the draft tube 1 is incomplete, and the liquid level of the scum accumulates. In addition, the stirring effect was not satisfactory. This invention was made in view of the above-mentioned circumstances, and it increases the amount of sludge scattered without increasing the stirring power, sufficiently moistens and softens the scum, and completely sucks 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 agitator according to the invention, the shaft is provided with a specially constructed liquid scattering member.

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

In FIGS. 3 and 4, a liquid scattering member 14 is attached to the shaft 12 slightly above the sludge liquid level.

The liquid scattering member 14 includes a cylindrical inner tube portion 15 attached to the shaft 12 above the screw 13, an outer tube portion 16 with an upwardly facing flap opening, and a connection between the inner and outer tube portions 15 and 16. A liquid passageway 18 is formed between the plurality of blades 15 and 16 provided in the housing. The blades 17 are curved in an arc shape when viewed from above, and the upper end portions are curved outward along the outer cylindrical portion 16. The other components of the stirrer are the same as the conventional one shown in FIG. That is, a screw 13 is attached to the lower end of the shaft 12 and is arranged within the draft tube 11. The screw 13 and the liquid scattering member 14 are rotated forward and backward by the operation of a rotating section installed on the top wall of the tank. In the agitator configured as described above, when the screw 13 is rotated in the direction of arrow A shown in the upper part of FIG. It hits the outer surface of the outer cylindrical body 16 and scatters outward. The remaining portion enters the flow path 18 and rises, is guided by the blades 17, and is scattered outward in large quantities over a long distance by centrifugal force. As a result, the scum that has accumulated on the liquid surface, particularly near the peripheral wall of the tank, is moistened and softened by the scattered sludge. 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. Therefore, only two blades may be provided at a small interval so as to form one liquid passage. After softening the scum in this way, when the screw 13 is rotated in the opposite direction of arrow A, the softened scum is transferred to the draft tube 1 along with the sludge.
1 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 is as described above, and includes a cylindrical inner tube portion 15 attached to the shaft 12 above the screw 13;
A fluid consisting of an outer cylindrical portion 16 with an upwardly facing opening that forms a water passage 18 with the cylindrical portion 15, and a plurality of blades 17 connected between the inner and outer cylindrical portions 15 and 16. Since the scattering member 14 is provided, it rises inside the draft tube 11 by the forward rotation of the screw 1 and spreads the liquid through the liquid passage 1.
The sludge that has entered the chamber 8 can be scattered outward in large quantities and far away by the blades 17.

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 drawings]

1 and 2 are longitudinal cross-sectional views of a conventional stirrer, FIG. 3 is a longitudinal cross-sectional view of essential parts of a stirrer according to the present invention, and FIG. 4 is a cross-sectional view taken along the - line in FIG. 3. 11...Draft tube, 12...
・Shaft, 13... Screw 1, 14...
...Liquid scattering member, 15...Inner cylinder part, 16.
...Outer cylinder part, 17...Blade, 18...
...Liquid passage.

Claims (1)

[Claims] 1. A cylindrical inner tube portion 15 attached to the shaft 12 above the screw 13, and an outer tube portion 16 with an upwardly facing opening that forms a liquid passage 18 between the cylindrical portion 15.
and a plurality of blades 17 connected between the inner and outer cylindrical parts 15 and 16.