JPH0213072Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a liquid stirring device that is capable of stirring a liquid and simultaneously mixing gas.

[Conventional technology]

A conventionally known liquid stirring device of this type is one described in Japanese Patent Publication No. 56-21452.
This stirring device is configured to stir a liquid by rotating a spiral stirring blade and at the same time mix gas, mainly air, into the liquid by using the negative pressure generated at the tip of a hollow stirring shaft. , has the great feature of being able to obtain both stirring and aeration performance with a single device.

However, when this device continuously stirs a liquid, the vortex generated on the water surface is drawn in by the water flow generated by the stirring blade and reaches the tip of the stirring blade.
There is a risk that impurities floating on the liquid surface will be drawn in, or the air on the liquid surface will be sucked into the vortex, causing abnormal noises.In extreme cases, the air sucked into the vortex may cause the It has the disadvantage of destroying air pressure, impairing air suction from the hollow shaft, and reducing aeration performance.

[The problem that the idea attempts to solve]

The present invention was developed in view of this, and its objective is to stop the growth of the vortex to a small scale and prevent the vortex from reaching the liquid surface.

[Means to solve the problem]

In order to solve the above problems, the stirring device of the present invention is provided with vertical blades extending in the axial direction of a hollow stirring shaft above the stirring blades, and a flat plate that is perpendicular to the vertical plate and parallel to the hollow shaft. It is characterized in that it is provided on the cover of the stirring shaft so as to cover at least directly above the air diffuser hole in the installed state.

By providing this vertical plate, the stirring device of the present invention can fully demonstrate its stirring and aeration performance without impairing its stirring power at all, and without impairing the air suction power obtained by negative pressure. be.

〔Example〕

Next, the present invention will be explained based on embodiments shown in the accompanying drawings.

1 indicates the entire liquid stirring device, and this stirring device 1 (also called an aerator) connects a hollow stirring shaft 3 to a driving device 2 directly or through a joint, and this driving device, stirring shaft 3 is covered with a cover 4, and a stirring shaft 3 is made to protrude from the lower end of the cover 4, and a stirring blade 5 having a spiral shape is formed on the outer periphery of the shaft end.
This stirring device is inserted and supported into an aeration tank, pond, or other stirring tank at the required depth and angle of inclination. Further, the hollow stirring shaft 3 is provided with a slit-shaped or circular suction hole 3a at a position above the liquid level, and the lower end of the shaft is opened at the tip of the stirring blade 5 to drain the liquid. A diffuser port 3b is provided for discharging air inside. The suction hole 3a and the aeration port 3b are a hollow hole 3c in the stirring shaft 3.
Conducted by.

In order to prevent the growth of a vortex generated by the rotation of the stirring blade 5, a vortex prevention plate 6 is provided at the lower end of the cover 4.

As shown in FIG. 2, this swirl prevention plate 6 extends in the axial direction of the stirring shaft 3, and is attached to a vertical plate 6a with the stirring blade 5 cut out and at a right angle to this vertical plate 6a. The generally trapezoidal flat plate 6b is provided so as to cover at least directly above the aeration port when the aeration device is installed. In the illustrated example, the airfoil shape is formed by gluing two plates together, but it is also possible to form the airfoil using a single plate.

When the drive device 2 of the stirring device 1 configured as described above is driven, the stirring blades 5 rotate through the stirring shaft, thereby generating a turbulent flow in the liquid, and
Negative pressure is generated on the tip side of the stirring shaft, and this negative pressure sucks the air entering the cover 4 through the suction hole 3a at the top of the hollow stirring shaft, passes through the hollow hole 3c, and moves it to the lower end of the shaft. is released into the liquid from the air diffuser port 3b. At this time, since the vertical plate 6a of the vortex prevention plate 6 is provided at the bottom of the cover in the direction of the stirring shaft axis and covering the stirring blades, the vortex flows at approximately 90 degrees with the vertical blade part 6a of this prevention plate. They begin to intersect and are cut off.

Further, since a large negative pressure section is formed near the aeration port of the stirring device, a water flow is generated toward the negative pressure section, and the water flow also forms a flow on the water surface.
As a result, a vortex is generated on the water surface, and the vortex grows toward the air diffuser. A vortex prevention plate consisting of a vertical plate and a flat plate is used to cut off this vortex in the middle and suppress its growth.
This is especially possible by arranging a flat plate directly above the air diffuser.

As a result, the liquid is sufficiently stirred in the layer below the stirring blade, and gas can be mixed and dissolved.

[Effect of idea]

Therefore, according to the present invention, a vertical plate extending above the stirring blade is provided, and a flat plate is provided perpendicular to the vertical plate and parallel to the hollow shaft directly above the air diffuser. This has the advantage of preventing the generation of vortices and further preventing the vortices formed on the water surface from growing and reaching the air diffuser, thereby ensuring reliable discharge of gas into the liquid.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of the whole, and FIG. 2 is a perspective view of the eddy current prevention plate. 1 is a stirring device, 2 is a drive device, 3 is a stirring shaft, 3
b is an aeration port, 4 is a cover, 5 is a stirring blade, 6 is a swirl prevention plate, 6a is a vertical plate, and 6b is a flat plate.

Claims (1)

[Scope of utility model registration request] The liquid is stirred by the stirring blade installed at the tip of the hollow shaft, and at the same time, a negative pressure is generated at the tip of the hollow shaft, and the gas sucked from the upper part of the shaft is pumped into the liquid through the aeration port installed at the tip of the hollow shaft. In the liquid stirring device, a cover that covers the outer periphery of the hollow shaft is provided between the motor and the spiral stirring blade, and the cover has a cover that extends in the axial direction of the hollow shaft, and includes a cover that covers the outer periphery of the hollow shaft. A vertical plate that reaches above the wing is installed,
A liquid stirring device further comprising a flat plate provided perpendicular to the vertical plate and parallel to the hollow shaft, and the flat plate covers at least directly above the air diffuser port in an installed state.