JP6817675B2 - Stirrer - Google Patents

Description

The present invention relates to a stirring device suitable for solid-liquid system, gas-liquid system, or gas-solid-liquid system mixed-phase stirring.

As an example 1 of a general conventional stirring device, for example, as shown in FIG. 9, an axial flow type stirring blade c is provided at the lower end of a rotating shaft b hanging from the center of the stirring tank a, and the stirring tank is provided. Some have a baffle d extending in the vertical direction on the inner peripheral surface of a (see Non-Patent Document 1).

Further, as an example 2 of the conventional stirring device when the concentration of the solid or slurry is high or when the solid is slowly dispersed at a low speed, as shown in FIG. 10, the rotating shaft hanging down in the central portion in the stirring tank e. A large wide blade g is provided in f, and a baffle h extending in the vertical direction is provided on the inner peripheral surface of the stirring tank e.

Further, as an example 3 of the conventional stirring device for mixing the gas-liquid system, for example, as shown in FIG. 11, a spoke-type stirring blade k is provided at the lower end of the rotating shaft j hanging from the central portion in the stirring tank i. In addition to the provision, a ventilation pipe l having a gas discharge port arranged just below the lower end of the rotating shaft j in the stirring tank i is provided, and a baffle m extending in the vertical direction is provided on the inner peripheral surface of the stirring tank i. is there.

"Mechanical Engineering Handbook C. Engineering" by the Japan Society of Mechanical Engineers (C1-43, Figure 2-47) Maruzen Publishing Co., Ltd. 1989

In Example 1 of the conventional stirring device, an axial flow stirring blade is installed and vertical convection is generated in the stirring tank a to promote stirring and mixing action, but in the case of solid-liquid system stirring such as slurry. There is a drawback that the fluidity of the central portion A of the bottom portion of the stirring tank a is poor and a dead zone is formed, the solid portion is stagnant, and suitable stirring cannot be performed.

Further, in the case of gas-liquid agitation, there is a problem that the action of dispersing bubbles is insufficient.

Further, in Example 2 of the conventional stirring device, when gas absorption is required, the absorption efficiency is poor, and as a result, a large amount of power is required, which is not economical.

Further, Example 3 of the conventional stirring device has a problem that the dispersion ability of bubbles decreases and the flow action decreases when the aeration flow rate increases.

Further, it is difficult to flow a solid such as sand or slurry, and it is not suitable for stirring a solid-liquid system or a gas-solid-liquid system.

The present invention solves these problems so that a solid-liquid system, a gas-liquid system, or a solid-gas-liquid mixed phase system can be suitably agitated.

To achieve the above object, the present invention is fixed to the lower end of the rotary shaft suspended in the stirred tank, and the bottom impeller lower sides close to the inner bottom surface of the agitation tank, the inner bottom surface of the agitation tank It is composed of a bottom stationary blade having an inner side at a position outside the rotation locus of the outer side of the bottom impeller fixed to the above, and has a gas discharge port in the vicinity of the bottom stationary blade in the stirring tank. An annular tube was provided that penetrated the bottom stationary blade.

According to the present invention, the dispersion action of solids and gases in a solid-liquid system, a gas-liquid system, or a gas-solid-liquid system can be dramatically improved.

It is a vertical sectional view of the stirring apparatus of Example 1 of this invention. FIG. 2 is a sectional view taken along line II-II of FIG. It is a vertical sectional view of the modification of the stirring apparatus of Example 1. FIG. It is a vertical sectional view of the stirring apparatus of Example 2 of this invention. It is a vertical cross-sectional view of the modification 1 of the stirring apparatus of Example 2. It is a vertical cross-sectional view of the modification 2 of the stirring apparatus of Example 2. FIG. 6 is a sectional view taken along line VII-VII of FIG. It is a vertical cross-sectional view of the modification 3 of the stirring apparatus of Example 2. It is a vertical cross-sectional view of Example 1 of the conventional stirring apparatus. It is a vertical cross-sectional view of Example 1 of the conventional stirring apparatus. It is a vertical cross-sectional view of Example 1 of the conventional stirring apparatus.

Examples of embodiments for carrying out the present invention are shown below.

Example 1 of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is an explanatory vertical cross-sectional view of the stirring device according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

Reference numeral 1 denotes a stirring device of the first embodiment, and 2 indicates a stirring tank of the stirring device 1. The stirring tank 2 is cylindrical and its inner bottom surface 2a is formed to be curved downward. A rotating shaft 3 is provided at the center of the stirring tank 2 so as to hang down to the inner bottom of the stirring tank 2, and for example, four bottom impellers 4 are fixed to the lower end of the rotating shaft 3. ..

The bottom impeller 4 has a large vertical width of the inner side 4a on the root side close to the rotation axis 3, and the width gradually decreases toward the outer side 4b on the outer tip side, and the outer side 4b Is extended in the vertical direction, and the lower side 4c close to the inner bottom surface 2a of the stirring tank 2 is formed from a substantially trapezoidal plate-like body formed in a curved shape along the inner bottom surface 2a.

Reference numeral 5 denotes a bottom stationary blade, and the bottom stationary blade 5 is radially fixed to the inner bottom surface 2a of the stirring tank 2 at a position near the outer side of the rotation locus of the outer side 4b of the bottom impeller 4, for example, 4. It is composed of a plate-shaped obstruction plate having a substantially right-angled triangular shape, and the outer side 4b of the bottom impeller 4 passes close to the inner side 5a extending in the vertical direction of the bottom stationary blade 5.

Next, the operation and effect of the stirring device 1 of this embodiment will be described.

After filling the stirring tank 2 with a solid liquid such as a slurry to be agitated to a predetermined level, the bottom impeller 4 is rotated by the rotating shaft 3.

As the bottom impeller 4 rotates, the slurry generates a swirling flow in the lower portion of the stirring tank 2. Then, when the slurry reaches the bottom stationary blade 5, the swirling flow has a radius due to the bottom stationary blade 5 due to the outer peripheral 4b of the bottom impeller 4 passing close to the inner side 5a of the bottom stationary blade 5. It is converted into a discharge flow in the direction, becomes an upward flow along the inner peripheral surface of the stirring tank 2, and reaches the upper part, becomes a flow toward the center of the stirring tank 2. Then, the liquid flows downward in the central portion of the stirring tank 2 to form a circulating flow.

According to the stirring device of the present embodiment, as described above, a circulating flow is formed in the stirring tank 2, and at the bottom, between the inner side 5a of the bottom stationary blade 5 and the outer side 4b of the bottom impeller 4. It has the effect that the slurry can be agitated by the strong radial discharge action generated in, and the dispersion uniformity in the solid-liquid system is improved, and the strong shearing force generated at the same time dramatically improves the dispersion action in the gas-liquid system. It became possible to improve.

In addition, as shown in the modification of Example 1 of FIG. 3, when the stirring tank 2 is a deep bottom type or a large size, for the purpose of absorbing gas from the gas phase portion, or for dissolving light powder or solid matter. In the case of disassembling or disassembling, the stirring device 1 further forms an inner peripheral surface baffle 6 extending vertically on the inner peripheral surface 2b in the stirring tank 2 and a downward flow on the upper part of the rotating shaft 3. An axial flow type auxiliary stirring blade 7 is provided.

In this embodiment, even when the stirring tank 2 is of a deep bottom type or large size, for the purpose of absorbing gas from the gas phase portion, or when light powder or solid matter is dissolved or decomposed. The auxiliary stirring blade 7 and the inner peripheral surface baffle 6 can create a downward flow that sends light powder or solid matter downward in the upper part of the tank 2, so that a circulating flow is formed in the entire tank. Also, at the bottom, it can be agitated by the strong shearing force generated between the inner side 5a of the bottom stationary blade 5 and the outer side 4b of the bottom impeller 4, so that low power can be achieved. Become.

Example 2 of the present invention will be described with reference to FIG.

FIG. 4 is a vertical sectional view of the stirring device 8 according to the second embodiment of the present invention.

In the stirring device 8 of the second embodiment, a gas discharge port 9 is provided at the center of the inner bottom surface 2a of the stirring tank 2 of the stirring device 1 of the first embodiment, and a ventilation pipe 10 is provided in the gas discharge port 9. Communicate.

The operation and effect of the stirring device 8 of the second embodiment will be described.

In the case of gas-liquid stirring, after the liquid is filled in the stirring tank 2 to a predetermined level, the gas is discharged from the ventilation pipe 10 into the stirring tank 2, and the bottom impeller is operated by the rotating shaft 3. Rotate 4.

With the rotation of the bottom impeller 4, the liquid forms a circulating flow in the stirring tank 2 as described in the stirring device 1 of the first embodiment, and the stirring tank 2 is formed from the gas discharge port 9. The gas discharged inside is drawn between the inner side 5a of the bottom stationary blade 5 and the outer side 4b of the bottom impeller 4, and the inner side 5a of the bottom stationary blade 5 and the outer side of the bottom impeller 4 are drawn. Due to the strong shearing force generated between 4b and 4b, the gas is diffused, gas is efficiently dispersed, and high gas absorption performance is exhibited.

Further, in the case of stirring a gas-solid-liquid system, after filling the stirring tank 2 with a solid-liquid such as a slurry to be stirred to a predetermined level, the gas is discharged from the ventilation pipe 10 into the stirring tank 2. At the same time, the bottom impeller 4 is rotated by the rotation shaft 3.

With the rotation of the bottom impeller 4, the slurry forms a circulating flow in the stirring tank 2 as described in the stirring device 1 of the first embodiment, and at the bottom, inside the bottom stationary blade 5. The slurry is agitated by a strong discharge flow generated between the side 5a and the outer side 4b of the bottom impeller 4, and the gas discharged from the gas discharge port 9 into the stirring tank 2 is the bottom stationary blade. It is drawn between the inner side 5a of the bottom impeller 4 and the outer side 4b of the bottom impeller 4, and diffuses due to the strong shearing force generated between the inner side 5a of the bottom stationary blade 5 and the outer side 4b of the bottom impeller 4. Therefore, gas is efficiently dispersed and high gas absorption performance is exhibited.

As described above, according to the stirring device 8 of the second embodiment, the dispersion action in the gas-liquid system or the gas-solid-liquid system can be dramatically improved.

In particular, in the agitation of a gas-solid-liquid system, even under agitation conditions in which solids (slurries) having a high specific gravity are mixed, it becomes possible to obtain both excellent solid flow action and gas absorption action.

As shown in the modified example 1 of the second embodiment of FIG. 5, when the stirring tank 2 is a deep bottom type or a large size, a wide plate-shaped blade 11 is continuously provided at the upper end of the bottom impeller 4. Therefore, the mixed phase system may be agitated by the large wide blade 12 formed by the bottom impeller 4 and the blade 11.

Also in the modified example 1 of the second embodiment, the dispersion action of the solid and the gas in the solid-liquid system, the gas-liquid system, and the gas-solid-liquid system can be dramatically improved.

As shown in the second modification of the second embodiment of FIGS. 6 and 7, a gas discharge port 9 is provided at the center of the inner bottom surface 2a of the stirring tank 2, and the ventilation pipe 10 communicates with the discharge port 9. Instead, in order to provide a gas discharge port near the inner side 5a of the bottom stationary blade 5, for example, an annular pipe 13 is provided in the stirring tank 2 so as to penetrate the inner portion of each bottom stationary blade 5. A discharge port 13a may be provided in the vicinity of each of the bottom stationary blades 5 of the annular pipe 13, and gas may be ventilated into the stirring tank 2 from the discharge port 13a.

A ventilation pipe (not shown) communicates with the annular pipe 13.

Also in the modified example 2 of the second embodiment, the dispersion action of the solid and the gas in the solid-liquid system, the gas-liquid system, and the gas-solid-liquid system can be dramatically improved.

Instead of providing the annular pipe 13, a ventilation pipe having a gas discharge port may be provided near the inner side 5a of each bottom stationary blade 5 (not shown).

Depending on the type of gas to be ventilated, when the gas discharge port is located near the inner side 5a of the bottom vane 5, air bubbles are entangled with the bottom impeller 4 and the bottom vane 5 due to the instantaneous reaction system, and the slurry is fixed. There is.

Therefore, as shown in the modified example 3 of the second embodiment of FIG. 8, a ventilation pipe having a gas discharge port 14a near the outer end 5b of each bottom stationary blade 5 may be provided in the stirring tank 2.

Also in the modified example 3 of the second embodiment, the dispersion action of solids and gases in the solid-liquid system, the gas-liquid system, and the gas-solid-liquid system can be dramatically improved, and particularly in the stirring of the gas-solid-liquid system. Solids will not stick to the bottom impeller 4 and the bottom stationary blade 5.

The stirring device of the present invention is used for solid-liquid stirring and air-solid-liquid stirring in medical products, foods, and the like.

1 Stirrer 2 Stirrer 2a Inner bottom surface 2b Inner peripheral surface 3 Rotating shaft 4 Bottom impeller 4a Inner side 4b Outer side 4c Lower side 5 Bottom stationary blade 5a Inner side 5b Outer end 6 Inner peripheral surface baffle 7 Auxiliary stirring blade 8 Stirrer 9 Gas discharge port 10 Ventilation pipe 11 Wing 12 Large wide blade 13 Circular pipe 13a Discharge port 14 Ventilation tube 14a Discharge port

Claims (3)

A bottom impeller fixed to the lower end of the rotating shaft hanging in the stirring tank and whose lower side is close to the inner bottom surface of the stirring tank.
Was fixed to the inner bottom surface of the agitation tank, and more become the bottom vane having an inner edge in the vicinity of the outside of the rotation locus of the outer edges of the bottom impeller,
A stirring device provided with an annular tube penetrating the bottom stationary blade having a gas discharge port in the vicinity of the bottom stationary blade in the stirring tank. The stirring device according to claim 1, wherein an axial-flow type rotary blade is provided above the rotating shaft, and an inner peripheral surface baffle extending in the vertical direction is provided on the inner peripheral surface of the stirring tank. The stirring device according to claim 1 or 2, wherein a large wide blade is continuously provided at the upper end of the bottom impeller.

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