JPS6116495B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mobile stirrer that moves up and down within a stirring tank.

When extracting sludge from sludge storage tanks or tanks that are part of nuclear power plants and other industrial plants, it is necessary to mix the sludge uniformly to make a slurry of uniform consistency due to transport and post-processing issues. There is a need. In addition, some sludges become highly dense, and in this case, periodic stirring is required. Conventionally, this type of stirring has generally used air, water circulation, externally inserted stirrers, submersible pumps, and the like.
However, various problems arise when nuclear power plants contain radioactive sludge or when tanks or storage tanks become larger. That is, in the case of air, the amount of vent gas to be processed increases. In the case of water circulation, larger valves and pumps,
The problem of nozzle clogging arises. With an externally inserted type stirrer, if the tank becomes large, there are mechanical and maintenance concerns. In addition, even immersion type submersible pumps are difficult to maintain.

Therefore, a mobile stirrer is available as a stirrer that can solve the various problems mentioned above. FIG. 1 is an explanatory diagram of the underwater operation of a conventional mobile agitator. In the figure, a mobile stirrer 1 includes a submersible motor 2, a rotating blade (not shown) connected to the submersible motor 2, and a stirring liquid suction casing 3 surrounding the rotating blade.
It is made up of. In the figure, 4 indicates a hanging wire of the stirrer 1, and 5 indicates a stirring tank.

In the above configuration, in order to stir the liquid contained in the stirring tank 5 with the stirrer 1, first, the sludge tank is stirred with the liquid flowing downward, and then the liquid is switched to an upward flow. to maintain an overall uniform mixture and uniform state. Since the stirrer 1 can be placed outside the system when stirring is not required, maintainability is improved and there is no concern about conventional nozzle clogging or generation of vent gas. Furthermore, since a downward flow is used in the early stage of stirring, supernatant water can be blown into the sludge layer and rolled up, and even if the sludge becomes dense, the densification can be easily released.

However, with this conventional stirrer 1, there is no problem in use when the liquid level in the stirring tank 5 is high, but when the liquid level in the stirring tank 5 drops to near the bottom of the tank,
Since the submersible motor 2, which makes up most of the stirrer 1, is exposed to the air and the motor cannot be cooled, the operation of the stirrer 1 must be stopped.

Taking the above points into consideration, the present invention has developed a device of this type that can be used even when the liquid level in the stirring tank is extremely low, and that has improved stirring effects compared to conventional mobile stirrers. This is what we are trying to provide.

The present invention provides a mobile stirrer comprising a submersible motor, a rotating blade connected to the submersible motor, and a stirring liquid suction casing, in which the outer periphery of the side surface of the rotating blade and the submersible motor is connected to the stirring liquid suction casing. This is characterized in that the stirred liquid passageway is completely surrounded by the agitated liquid passageway.

Hereinafter, the present invention will be explained with reference to an embodiment shown in FIGS. 2 to 5. The same reference numerals as in FIG. 1 indicate the same parts, and 6 indicates a rotary blade. As clearly shown in the figure and FIG.
The outer periphery of the side surface is also completely surrounded by the stirred liquid suction casing 3 to form a stirred liquid passageway 7.

Therefore, according to the present invention having the above configuration, as shown by the arrows in FIG. 4, the flow of the liquid in the vertical direction stirred by the stirrer 1 is expanded compared to the conventional mobile stirrer, A good stirring effect can be obtained, and the same effect can be obtained as a larger conventional mobile stirrer.

Figure 5 shows the use of the stirrer 1 in a so-called extremely low level state where the liquid level in the stirring tank 5 is close to the tank bottom. By switching to the submersible motor 2, the submersible motor 2 can be cooled, and the agitator 1 can be continuously used.

As described above, the present invention has the advantage that it can be used even when the liquid level in the stirring tank is extremely low, and that the stirring effect can be improved compared to conventional mobile stirrers.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the underwater operation of a conventional mobile agitator, FIG. 2 is an explanatory diagram of the internal structure of the mobile agitator according to the present invention, FIG. 3 is a partially cutaway perspective view of FIG. 2, and FIG. Both FIG. 5 and FIG. 5 are explanatory views of the underwater operation of the stirrer of the present invention. DESCRIPTION OF SYMBOLS 1... Mobile stirrer, 2... Submersible motor, 3... Stirring liquid suction casing, 6... Rotating blade, 7... Stirring liquid passageway.

Claims (1)

[Claims] 1. In a mobile stirrer comprising a submersible motor, a rotating blade connected to the submersible motor, and a stirring liquid suction casing, the outer periphery of the side surface of the rotating blade and the submersible motor is completely surrounded by the stirring liquid suction casing. A mobile agitator characterized in that a stirring liquid passageway is formed by forming an agitated liquid passage.