JP2000070694A - Fluid stirring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To homogeneously stirr and mix a fluid without bringing about trouble such as breakage or curving or the formation of air bubbles from gas occluded in a fluid by attaching a flow distributor to the inside wall of a stirring tank around the rotary body disposed in the stirring tank and generating a spiral flow in the peripheral direction of the fluid accompanied by the rotation of the rotary body. SOLUTION: A fluid is charged in a stirring tank 1 from a supply port 1a and, when the rotary body 2 immersed in the fluid is rotated counterclockwise, the fluid present around the rotary body 2 is rotated in the same direction as the rotary body 2 and the fluid present outside the rotary body 2 is drawn in the center direction of the stirring tank 1 to pass the blade part of the flow distributing member to be let out upwardly. At the same time, the fluid present in the vicinity of the inside wall of the stirring tank 1 is drawn in the stirring tank l by the rotary steam of the center part of the stirring tank 1 to pass the blade part to be let out downwardly. The fluid to which rotary motion is applied flows by spiral motion in a peripheral direction. By this constitution, the positional conversion of the fluid positioned on both inner and outer sides in the stirring tank 1 is performed and the stirring and mixing of the fluid in a diameter direction is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer for mixing and homogenizing fluids.

[0002]

2. Description of the Related Art As a means for homogenizing a fluid, a method of stirring and mixing is known. As a device for stirring and mixing a fluid, a stirring blade 5 is attached to a rotating shaft 4 as shown in FIG. 2. Description of the Related Art Generally, a fluid stirrer that stirs and mixes a fluid by disposing a stirrer in a stirring tank 1 filled with a fluid and rotating the stirrer by a rotation driving unit (not shown) connected to a rotating shaft 4 is generally used. Used. In such a fluid stirring device, the stirring blade 5 shears the fluid located in front of the stirring blade 5 with respect to the rotation direction of the stirring body, and the fluid is stirred and mixed by repeating this shearing. You.

[0003]

By the way, in the above-mentioned conventional fluid stirring device, when the stirring member is rotated in a state where the stirring blade is immersed in the fluid, a rotational resistance force is generated in the fluid due to the viscosity of the fluid. Rotational resistance is transmitted from the impeller to the rotating shaft and acts as a torsional force on the rotating shaft, causing breakage or bending of the rotating shaft. In particular, in order to obtain a strong stirring effect, it is necessary to increase the surface area of the stirring blade to increase the contact area with the fluid, or to rotate the stirring body at a high speed. It is empirically known that a phenomenon of increasing the acting torsional force accompanies, and as a result, failures frequently occur in the fluid agitating device exhibiting a strong agitation force. Further, depending on the type of the fluid, the rapid fluctuation of the pressure on the fluid generated near the stirring blade due to the rotation of the stirring body promotes gasification of the gas stored in the fluid, which is preferable for homogenizing the fluid. There is a problem that no bubbles are formed in the fluid. In particular, in order to stir and mix fluid continuously and continuously in the industrial field, it is necessary to avoid failure of the fluid stirring device and generation of bubbles in the fluid as much as possible.

The present invention has been made in view of the above, and it is an object of the present invention to provide a fluid agitator that is free from breakage, bending, and other troubles, and that involves the formation of gas bubbles stored in the fluid. It is an object of the present invention to provide a fluid stirring device capable of stirring and mixing a fluid uniformly without mixing.

[0005]

According to the present invention, there is provided a fluid stirring apparatus comprising: a cylindrical stirring tank; a rotating body provided in the stirring tank; and an inner wall surrounding the rotating body and surrounding the rotating body. And a rectifier for generating a spiral flow in the circumferential direction with the rotation of the rotating body in the fluid.

[0006]

Since the fluid agitating device of the present invention is constructed as described above, when the rotating body is immersed in a fluid and rotated,
In the fluid in the vicinity of the rotating body, a flow that rotates accompanying the rotating body is generated, and when the fluid passes through the straightening body, a spiral flow is formed in the circumferential direction. By performing this flow conversion continuously, the exchange of the position of the fluid near the center of the stirring tank with the fluid near the inner wall of the stirring tank is promoted, and the stirring and mixing are realized. That is, the rotating motion generated in the fluid by the rotator and the helical motion generated in the fluid by the rectifier are repeated, whereby the stirring and mixing action is provided to the fluid.

In the fluid stirring device of the present invention, the rotating body includes:
Since no agitating blade or agitating arm that causes rotational resistance to the fluid is provided, the torsional force generated on the rotating shaft is small, and breakage or bending of the rotating body can be avoided.

Further, in the fluid stirring apparatus of the present invention, the stirring and mixing action is induced by the rotational movement of the fluid, so that the desired mixing and stirring is performed in proportion to the rotational movement speed of the fluid, that is, the rotation speed of the rotating body. The effect can be obtained.

Further, in the conversion of the fluid from the rotational motion to the helical motion, there is no local change in the flow velocity of the fluid, and the pressure on the fluid has a continuous distribution in the stirring tank. It is possible to suppress the bubble generation phenomenon of the stored gas in the fluid, which is seen in the device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fluid stirring device of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing a fluid stirring device of the present invention. FIG. 2 is an explanatory diagram of a flow straightener and a fluid streamline centered on the flow straightener constituting the fluid stirring device of the present invention. 1 and 2, reference numeral 1 denotes a stirring tank, 2 denotes a rotating body, and 3 denotes a straightening body.

The stirring tank 1 is a cylindrical container, and a supply port 1a for filling a fluid into the stirring tank 1 is provided on an upper side wall, and a discharge port 1 for taking out a fluid from the stirring tank 1 is provided on a lower side wall.
b are provided respectively.

The rotating body 2 includes a cylindrical body 2a and a body 2
a shaft part 2b provided continuously and coaxially above a, and is inserted into the stirring tank 1 from the ceiling of the stirring tank 1, and the upper end thereof is rotationally driven so as to be rotatable about the shaft ( (Not shown).

The rectifier 3 has an annular lower plate 3a fixed to the inner wall of the stirring tank 1 and an annular upper plate having a diameter slightly smaller than that of the lower plate 3a and provided opposite to the lower plate 3a. 3b and a plurality of wings 3c which are sandwiched between the lower plate 3a and the upper plate 3b and are erected at equal intervals in the circumferential direction with different phases.

A method for stirring and mixing a fluid using the fluid stirring device of the present invention will be described below. In FIG. 2, G indicates a streamline of the fluid.

When the fluid is filled into the stirring tank 1 through the supply port 1a and the rotating body 2 immersed in the fluid rotates counterclockwise by the rotation driving means, the fluid around the rotating body 2 It rotates in the same direction as the rotation direction, and further passes through the wings 3c of the rectifying body 3 and escapes above the upper plate 3b while drawing the fluid outside thereof toward the center of the stirring tank 1. At the same time, the fluid in the vicinity of the inner wall of the stirring tank 1 is drawn into the stirring tank 1 by the rotational flow in the center of the stirring tank 1, passes through the blades 3 c, and falls below the upper plate 3 b. As described above, the fluid given the rotational motion by the rotary body 2 flows along with the circumferential spiral motion around the upper plate 3b when passing through the flow regulating body 3. As described above, the fluid alternates between the rotational motion and the spiral motion, whereby the position of the fluid located inside the stirring tank 1 and the position of the fluid located outside the stirring tank 1 are changed. Is realized in the radial direction.

Further, by mounting a plurality of flow regulating members 3 in the vertical direction in the stirring tank 1, the position of the fluid in the stirring tank 1 and the fluid in the lower part of the stirring tank 1 are changed. Stirring and mixing of the fluid in the axial direction in the stirring tank 1 are realized.

After stirring and mixing as described above, the stirring tank 1
The fluid taken out from the discharge port 1b did not contain bubbles, and the fluid was highly homogenized.

FIG. 1 shows an example in which three rectifiers 3 are attached to the inner side wall in the stirring tank 1, but the number of rectifiers 3 may be appropriate. It is preferable that the rectifiers 3 are provided so as to be substantially equally spaced apart from each other in the vertical direction.

The shape of the flow regulating body 3 is not limited to the shape shown in FIG. 2, but may be applied to any structure having a structure that generates a spiral flow in the fluid in the circumferential direction.

The stirring tank 1, the rotating body 2, and the rectifying body 3 constituting the fluid stirring apparatus of the present invention can be made of any material having a certain mechanical strength. Those that exhibit erosion are preferred.

[0022]

According to the fluid agitating device of the present invention, the torsional force generated on the rotating shaft is reduced so that the rotating body does not break down or bend, and the gas bubbles occluded in the fluid. Therefore, an excellent effect of enabling stable stirring and mixing over a long period of time is exhibited.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a fluid stirring device of the present invention.

FIG. 2 is an explanatory diagram of a rectifier and a fluid streamline centered on the rectifier that constitute the fluid stirring device of the present invention.

FIG. 3 is a partially cutaway perspective view showing a conventional fluid stirring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stirring tank 2 Rotating body 3 Rectifier 3a Lower board 3b Upper board 3c Wing

Claims (1)

[Claims] 1. A cylindrical stirring tank, a rotating body provided in the stirring tank, and a peripheral part of the rotating body, which is attached to an inner wall of the stirring tank. A fluid agitator comprising: a rectifier that generates a spiral flow in the circumferential direction.