JPS634495Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid stirring device.The purpose of the invention is to rotatably support a shaft end with stirring blades, to have shaft strength, and to provide gas even for liquids with high liquid density. This allows for efficient stirring while supplying.

In conventional liquid stirring devices, a stirring blade is provided at the lower end of a drive shaft rotated by a drive device placed above the liquid surface, and stirring is performed while the blade is immersed at a desired position below the liquid surface. ing. Therefore, since the lower end of the shaft is a free end, there is a limit to the length of the shaft due to the resistance caused by the rotation of the liquid during agitation. It was unsuitable for stirring in thick liquids.

In order to solve the above problem, conventional
There is a device, such as the device described in Japanese Patent No. 3891, in which the upper and lower sides of a hollow shaft are supported by bearings, respectively, and the hollow shaft is supported on both sides. However, in this device, it is necessary to use a universal joint that can absorb misalignment of the shaft center for connection to the driving machine rotating shaft. Since the stirring blade is still cantilevered, there is a drawback that the effect of whirling motion is large.

The present invention was made in view of this, and the upper end of the stirring shaft is continuously supported by the rotating shaft of the drive machine, and
It is characterized in that it is pivoted at the lowermost end further forward from the tip of the stirring blade, and that an air diffusion hole is provided between the tip of the stirring blade and the bearing. In order to support the shaft at the lowest end, a bracket is provided from the mounting bracket of the drive machine downward in parallel to the drive shaft, and a bearing is provided at the tip of the bracket.

The present invention will be explained below based on the illustrated embodiments.

In the figure, 1 is a stirring tank or pond filled with a liquid to be stirred while being supplied with gas.A bracket 2 is provided on the slab or upper part of the stirring tank 1, and this bracket 2 is placed at a predetermined position below the liquid level in the tank. The lower end of the bracket shall be fixed to the tank bottom by inserting the bracket up to the bottom or reaching the bottom of the tank as shown in the figure. A drive device 3 is installed on this bracket 2 and above the liquid level.
A hollow shaft 4 of a required length is provided on this drive device either directly or via a coupling, and a screw-shaped stirring blade 5 is provided on the outer periphery of the lower end of the shaft. Further, a conical cone 6 is provided at the lower end of the shaft 4, and an aeration port 7 is formed on the outer peripheral surface of the conical cone 6, and the cone 6 is rotatably supported by an underwater bearing 8. The underwater bearing 8 is mounted on a bearing seat 9 that projects from the bracket 2.

When the drive device 3 is driven in the stirring device constructed as described above, the stirring blades 5 are rotated via the hollow shaft 4. As a result, the liquid is stirred by the stirring blade immersed in the liquid to the required depth, and negative pressure is generated in the axial direction of the liquid by stirring and extruding the liquid, and this negative pressure causes a hole to be drilled above the liquid level of the shaft. Gas or air on the liquid surface is sucked through the opening 4a, flows down inside the hollow shaft, and is radiated into the liquid from the aeration port 7 on the outer periphery of the conical cone at the lower end of the shaft.
When gas or air is radiated into the liquid from the aeration port of this hollow shaft, it is guided by the cone and radiated diagonally forward of the shaft, and the stirring flow generated by the rotation of the stirring blades causes fine particles to be blown into the liquid. The mixture is dissolved into a mixed atmosphere.

According to the present invention, the lower end of a hollow shaft equipped with stirring blades is supported by a bearing, and gas or air is mixed into the liquid from inside the shaft through the aeration port at the lower end of the shaft. Gas supply and stirring can be performed easily even when the depth is deep or when the density of the liquid is high.Also, even when a stirring device with a long shaft length is required, the shaft end is supported by a bearing to sufficiently withstand the stirring strength even if the shaft strength is reduced. This has the advantage that the material of the shaft can be selected from a wide range depending on the properties of the liquid.

[Brief explanation of the drawing]

FIG. 1 is an overall front view, and FIG. 2 is an enlarged view of the main parts. 1... Stirring tank, 2... Bracket, 3... Drive device,
4... Shaft, 4a... Opening, 4b... Opening, 5... Stirring blade, 6... Conical cone, 7... Air diffuser port, 8... Underwater bearing, 9... Bearing seat.

Claims (1)

[Scope of utility model registration request] A hollow stirring shaft is fixed to the rotating shaft of the drive device, and a screw-shaped stirring blade is provided on the stirring shaft, and the stirring shaft is extended forward from the tip of the stirring blade, and the extension portion is attached to the bearing. The stirring device for liquid is supported by a stirring shaft, and the extension portion is provided with aeration holes for diffusing gas taken in from the upper part of the stirring shaft into the liquid.