JP2001079378A - Mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixer giving preferable solubility or degree of mixing by effectively utilizing high speed turning flow generated in the center of mixing blades. SOLUTION: A rotary disk 2B for the mixing blades 2 copes with to be close to the bottom plate 1B of a mixing vessel 1 and a discharge pipe 5 for discharging a material dissolved or mixed in the mixing vessel 1 is provided at a position of the bottom plate 1B opposed to the center of the mixing blades 2. When the mixing blades 2 are rotated, a main turning flow S having a flow velocity fixed by the revolution speed is generated. On the other hand, a free vortex type turning flow S1 increased in the flow velocity with being close to the center part of the rotary disk 2B is generated between the bottom plate 1B and the rotary disk 2B. Because the flow velocity of the turning flow S1 at the vicinity of the center part of the rotary disk 2B becomes higher than that of the main turning flow S, the shear force acting to the dissolving powder or the mixing powder is increased and the particle diameter of the powder is made fine to improve the solubility or the degree of mixing to water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer suitable for mixing powder and liquid or mixing different kinds of liquids.

[0002]

2. Description of the Related Art It is possible to produce drinking water or a drinking drug solution obtained by dissolving a water-soluble powder in water or a drinking drug solution obtained by mixing a water-insoluble powder with water, or to mix a liquid emulsifier with a different liquid such as a solute. A mixer shown in FIG. 3 is known as a mixer used for the above.

This mixer comprises a mixing tank 1 and a mixing blade 2
, A drive device 3 and a discharge passage 4. The mixing blade 2 includes a plurality of (two to four) mixing blades 2 </ b> A, 2 </ b> A, and is charged in the mixing tank 1. The driving device 3 is a rotating shaft 3A
And a motor 3B. The mixing blade 2 is fixed to the tip of the rotating shaft 3A, and the rear end of the rotating shaft 3A is connected to the motor 3B via a coupling 4.

On the other hand, the bottom plate 1 on the peripheral wall 1A of the mixing tank 1
A discharge pipe 5 for discharging the mixture through the vicinity of B is provided. The distal end of the processing liquid supply pipe 6 is inserted into the upper end opening of the mixing tank 1, and the discharge pipe 5 is provided with a valve V1. The processing liquid supply pipe 6 is provided with a valve V2.

[0005] According to this type of mixer, for example, a predetermined amount of water-soluble powder is weighed and charged into the mixing tank 1 with the valve V1 closed, and then the measured predetermined amount of water is added. After being supplied from the processing liquid supply pipe 6 into the mixing tank 1, the valve V2
Is closed and the motor 3B is started. Thereby, the rotating shaft 3A and the mixing blade 2 rotate, and the water-soluble powder can be dissolved in the water in the mixing tank 1. By opening the valve V1 after stopping the motor 3B, the aqueous solution in which the water-soluble powder is dissolved can be discharged from the discharge pipe 5 and collected.

[0006]

According to this type of mixer, the shear rate acting on the water-soluble powder or the water-insoluble powder increases as the flow velocity of the swirling flow generated by the rotation of the mixing blade increases (is higher). It is said that the force is increased, the particle size of the powder is reduced, and the solubility and mixing degree in water can be remarkably improved. For this reason, in the conventional mixer, the speed of the swirling flow is increased by rotating the mixing blade at a high speed to reduce the particle size of the powder.

However, since the high-speed rotation of the mixing blade is limited, the flow velocity of the swirling flow is also limited by the maximum speed of the mixing blade. Therefore, the refinement of the particle size of the powder is limited to the swirling flow rate generated during the highest speed rotation of the mixing blade, and depending on the type of the water-soluble powder or the water-insoluble powder, a preferable solubility or In some cases, the degree of mixing cannot be expected.

On the other hand, when mixing different kinds of liquids such as a liquid emulsifier and a solute, the higher the flow rate of the swirling flow generated by the rotation of the mixing blade, the more significantly the degree of mixing can be improved. The degree of rotation is limited to the limit of the swirling flow rate generated during the highest speed rotation of the mixing blade, and there is a problem that a more preferable degree of mixing cannot be expected.

By the way, it is known that if there is an outlet at the center of the swirling flow, the swirling flow increases the swirling speed in a free vortex in inverse proportion to the radius toward the center. Therefore, the present invention focuses on such a phenomenon, and effectively utilizes the high-speed swirling flow generated in this central portion.
It is an object of the present invention to provide a mixer capable of expecting favorable solubility and mixing degree.

[0010]

In order to achieve the above object, a mixer according to the present invention comprises: a rotating disk disposed close to a bottom plate of a mixing tank; and a driving device for rotating the rotating disk. A mixing blade is configured by the rotating disk and a plurality of mixing blades provided on at least the upper surface and the lower surface of the rotating disk, and is mixed at a portion of the bottom plate facing a center portion of the mixing blade. A discharge passage for discharging a substance dissolved or mixed in the tank is provided.

According to the present invention, when the mixing device is rotated by the activation of the driving device, a swirling flow having a flow rate determined by the rotation speed of the mixing blade is generated in the mixing tank. on the other hand,
Between the bottom plate of the mixing tank and the turntable arranged close to the bottom plate, a free-vortex swirling flow is generated in which the flow velocity increases as approaching the center of the turntable. In this free vortex swirl flow, the flow velocity near the center of the rotating disk is higher than the flow velocity of the main swirl flow in the mixing tank determined by the rotation speed of the mixing blade. The shearing force acting on the powder or the mixed powder increases, and acts to improve the solubility in liquid and the degree of mixing by reducing the particle size of the powder. Also, it acts to improve the degree of mixing between different kinds of liquids. On the other hand, since the discharge passage is provided at a portion facing the center of the mixing blade, a liquid in which the dissolved powder is dissolved, a liquid in which the undissolved powder is mixed, a mixed liquid of different liquids, When the powder is discharged from the discharge passage and collected, the powder always passes through the high-speed swirling flow area, so that the particle diameter of the powder is also reduced during the passage to improve the solubility and mixing degree in the liquid. By adding the action, the solubility and the degree of mixing in the liquid can be further improved, and the degree of mixing between different kinds of liquids can be further improved.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, and the same or corresponding parts as those in the conventional example of FIG. In FIG. 1, the mixer includes a mixing tank 1, a mixing blade 2, a driving device 3, and a discharge pipe 5. The mixing blade 2 is a rotary plate 2
B, and a plurality of (two to four) mixing blades 2A, 2A protrudingly provided on the upper surface of the rotating disk 2B,
The rotating disk 2B is inserted into the mixing tank 1 in a state of approaching the bottom plate 1B of the mixing tank 1. The driving device 3 is a rotating shaft 3A
And a motor 3B. The tip of the rotating shaft 3A is inserted into the central boss 2b of the rotating disk 2B, and the rotating disk 2B is fixed to the rotating shaft 3A so as to be simultaneously rotatable by a coupling means (not shown) such as a key connection. I have. The rear end of the rotating shaft 3A is connected to a motor 3B via a coupling 4.

On the other hand, the discharge pipe 5 is for discharging a liquid in which dissolved powder is dissolved, a liquid in which non-dissolved powder is mixed, a mixed liquid of different liquids, and the like from the mixing tank 1. The bottom plate 1B of the mixing tank 1 penetrates a portion facing the center of the mixing blade 2 and is attached to the bottom plate 1B in a liquid-tight manner. The distal end of the processing liquid supply pipe 6 is inserted into the upper end opening of the mixing tank 1, the discharge pipe 5 is provided with a valve V 1, and the processing liquid supply pipe 6 is provided with a valve V 2.

With such a configuration, a predetermined amount of water-soluble powder is weighed and charged into the mixing tank 1 with the valve V1 closed, and then the measured predetermined amount of water is supplied to the processing liquid. Tube 6
, And then the valve V2 is closed to start the motor 3B. Thereby, the rotating shaft 3A and the mixing blade 2 rotate, and the water-soluble powder can be dissolved in the water in the mixing tank 1. By opening the valve V1 while the mixing blade 2 is kept rotating, the aqueous solution in which the water-soluble powder is dissolved can be discharged from the discharge pipe 5 and collected. A predetermined amount of water-insoluble powder is weighed and put into the mixing tank 1, a predetermined amount of water is supplied from the processing liquid supply pipe 6 into the mixing tank 1, and then the valve V2 is closed and the motor 3B
Is activated, the water-insoluble powder can be mixed with the water in the mixing tank 1. By opening the valve V1 while the mixing blade 2 is rotating, the water-insoluble powder is mixed. The discharged water can be discharged from the discharge pipe 5 and collected. Of course, different kinds of liquids are measured and the processing liquid supply pipe 6 is measured.
From the mixing tank 1, the valve V2 is closed and the motor 3B is started to mix the different liquids in the mixing tank 1 with each other. By opening the valve V1, the mixing is performed. The liquid can be discharged from the discharge pipe 5 and collected.

When the mixing blade 2 is rotated by the activation of the motor 3B, a main swirling flow S having a flow velocity determined by the rotation speed of the mixing blade 2 is generated in the mixing tank 1. On the other hand, between the bottom plate 1B of the mixing tank 1 and the rotating disk 2B approaching the bottom plate 1B, a free vortex swirling flow S1 whose flow velocity increases as approaching the center of the rotating disk 2B is generated. Since the flow velocity near the center of the rotating disk 2B in the free vortex swirling flow S1 is higher than the flow velocity of the main swirling flow S determined by the rotation speed of the mixing blade 1, the molten powder The shear force acting on the body or the mixed powder increases, and the particle size of the powder can be reduced to improve the solubility in water and the degree of mixing. Also, it acts to improve the degree of mixing between different liquids.

On the other hand, since the discharge pipe 5 is provided at a portion facing the center of the mixing blade 2, water in which the dissolved powder is dissolved, water in which the undissolved powder is mixed, or water of a different kind is mixed. When the mixed liquid and the like are discharged from the discharge pipe 5 and collected, the mixed liquid always passes through the high-speed swirling flow area. For this reason, even when passing through the high-speed swirling flow region, the action of improving the solubility and mixing degree in the liquid by making the particle size of the powder finer is added, and further improving the solubility and the mixing degree in the liquid, The degree of mixing between different kinds of liquids can be improved.

That is, since there is a limit to the high-speed rotation of the mixing blade, the flow velocity of the main swirling flow S is limited to the maximum rotation speed of the mixing blade 2 as a limit. The shear force acting on the dissolved powder or the mixed powder by the flow S1 can be increased, and the particle size of the powder can be further reduced, so that preferable solubility and mixing degree can be expected, and the mixing degree between different liquids can be expected. Can be further improved.

In the above embodiment, the rotating disk 2B
A mixing blade 2 having a configuration in which a plurality of mixing blades 2A, 2A are provided so as to protrude only on the upper surface of the rotating disk 2B is used, but as shown in FIG. And a mixing blade 2 having a configuration in which a plurality of mixing blades 2A, 2A are provided on the lower surface of the rotating disk 2B. By using the mixing blade 2 having such a configuration, the bottom plate 1B of the mixing tank 1 and the bottom plate 1B
The shearing action in the high-speed swirling flow region between the rotating disk 2B approaching B and the rotating disk 2B can be further increased.

[0019]

As described above, according to the present invention, the rotating disk of the mixing blade is arranged close to the bottom plate of the mixing tank, and the discharge passage is provided at a portion of the bottom plate facing the center of the mixing blade. Therefore, the shear force acting on the dissolved powder or the mixed powder is increased by the swirling flow having a higher flow velocity than the main swirling flow having a higher flow velocity than the swirling flow in the tank determined by the rotation of the mixing blade, and the particle size of the powder is increased. Since the diameter can be further reduced, favorable solubility and mixing degree can be expected, and the mixing degree between different kinds of liquids can be further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional example.

[Description of Signs] 1 Mixing tank 1B Bottom plate of mixing tank 2 Mixing blade 2A Mixing blade 2B Rotating disk (rotating disk) 5 Discharge pipe (discharge passage)

Claims (1)

[Claims] 1. A rotating disk disposed close to a bottom plate of a mixing tank, and a drive device for rotating the rotating disk, and provided on at least the upper surface and the lower surface of the rotating disk and the upper surface and the lower surface of the rotating disk. A mixing blade is constituted by the plurality of mixing blades, and a discharge passage for discharging a substance dissolved or mixed in the mixing tank is provided at a portion of the bottom plate facing the center of the mixing blade. A mixing machine.