JP2021000589A - Agitation blade assembly and agitation tank - Google Patents

Abstract

To provide an agitation blade assembly and an agitation tank capable of generating a uniform mixed state when mixing, for example, both materials having different specific gravities.SOLUTION: An agitation blade assembly 10 is set in a tank 9 storing a liquid Q1 and used for the agitation of the liquid Q1. The agitation blade assembly 10 is set at the bottom 91 of the tank 9, is rotatably supported around a rotation axis 11 parallel in a vertical direction and has a first agitation blade 1 generating a first flow FL1 flowing upward along the side wall part 92 of the tank 9 after flowing in a direction moving away from the rotation axis 11 to the liquid Q1 when being rotated and a second agitation blade 2A and a second agitation blade 2B set upward from the first agitation blade 1. The second agitation blade 2A and the second agitation blade 2B are rotatably supported around the rotation axis 11, are vertically faced to the liquid Q1 when being rotated in a downward direction while moving away from the rotation axis 11 and generate a second flow FL2 not hindering the first flow FL1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a stirring blade assembly and a stirring tank.

A stirrer for stirring a liquid is known (see, for example, Patent Document 1). The stirrer described in Patent Document 1 includes a stirrer, an upper inclined blade supported by a stirring shaft, and a bottom blade supported by the stirring shaft and arranged below the upper inclined blade. The stirrer described in Patent Document 1 can stir the liquid in the stirrer by rotating the upper inclined blade and the bottom blade around the stirring axis. Further, the rotation diameter of the upper inclined blade and the rotation diameter of the bottom blade are the same.

Japanese Unexamined Patent Publication No. 2009-220083

However, in the stirrer described in Patent Document 1, since the rotation diameter of the upper inclined blade and the rotation diameter of the bottom blade are the same, the upward flow generated by the rotation of the bottom blade and the rotation of the upper inclined blade There is a risk that the resulting downward flow will cancel each other out. In this case, in the stirring tank, for example, the materials rotate together, and even if materials having different specific gravities are mixed with each other, the mixed state of the materials becomes non-uniform, that is, there is a problem that uneven mixing occurs.

An object of the present invention is to provide a stirring blade assembly and a stirring tank capable of producing a uniform mixed state when, for example, materials having different specific gravities are mixed with each other.

One aspect of the stirring blade assembly of the present invention is a stirring blade assembly having a bottom portion and a side wall portion, which is installed in a tank for storing a liquid and used for stirring the liquid.
It is provided on the bottom portion and is rotatably supported around a rotation axis parallel to the vertical direction. When rotated, the liquid is directed away from the rotation axis and then upward along the side wall portion. The first stirring blade that produces the first flow and
A second stirring blade provided above the first stirring blade is provided.
The second stirring blade is rotatably supported around the rotation axis, and when rotated, the second stirring blade moves vertically downward with respect to the liquid while moving away from the rotation axis, and does not obstruct the first flow. It is characterized by producing two flows.

One aspect of the stirring tank of the present invention is a tank having a bottom and storing a liquid.
It is characterized in that it is installed in the tank and includes the stirring blade assembly of the above one aspect used for stirring the liquid.

According to the present invention, the first flow 1 and the second flow can stably generate convection that descends near the rotation axis and rises near the side wall. By this convection, materials having different specific gravities can be agitated and these materials can be uniformly mixed.

FIG. 1 is a partial vertical cross-sectional side view showing a first embodiment of the stirring tank of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a cross-sectional view taken along the line CC in FIG. FIG. 5 is a cross-sectional view taken along the line DD in FIG. FIG. 6 is a diagram showing a state of flow in the tank when the stirring tank shown in FIG. 1 is operated. FIG. 7 is a side view showing a second embodiment of the stirring tank of the present invention. FIG. 8 is a side view showing a stirring blade assembly provided in the stirring tank (third embodiment) of the present invention. FIG. 9 is a vertical cross-sectional view showing a stirring blade assembly provided in the stirring tank (fourth embodiment) of the present invention.

Hereinafter, the stirring blade assembly and the stirring tank of the present invention will be described in detail based on the preferred embodiments shown in the accompanying drawings.
<First Embodiment>
FIG. 1 is a partial vertical cross-sectional side view showing a first embodiment of the stirring tank of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a cross-sectional view taken along the line CC in FIG. FIG. 5 is a cross-sectional view taken along the line DD in FIG. FIG. 6 is a diagram showing a state of flow in the tank when the stirring tank shown in FIG. 1 is operated. In the following, for convenience of explanation, the upper side in FIGS. 1, 3, 4 and 6 is referred to as "upper (or upper)" and the lower side is referred to as "lower (or lower)" (FIGS. 7 to 7). The same applies to 9).

In the present embodiment, as an example of application of the stirring tank 1, a case where the stirring tank 100 is used to mix fruit pulp grains and fruit juice juice to produce juice containing pulp will be described. The stirring tank 100 shown in FIG. 1 includes a tank 9 and a stirring blade assembly 10 installed in the tank 9. The configuration of each part will be described below.

The tank 9 has a bottom portion 91 that is rounded downward (outside), and a side wall portion 92 that is erected upward from the bottom portion 91 and has a cylindrical shape. Then, the tank 9 can store the liquid Q1 in the space 93 surrounded by the bottom portion 91 and the side wall portion 92. When the stirring tank 1 is used to produce juice containing pulp as described above, in the present embodiment, the liquid Q1 is fruit juice, and the grains Q2 mixed with the liquid Q1 are pulp grains.

In the present embodiment, the ratio H / D ₉₂ of the inner diameter φD ₉₂ of the side wall portion 92 to the height H from the bottom portion 91 to the liquid level LS of the liquid Q1 is in the range of 1 or more and 1.2 or less.
Further, the tank 9 may have a baffle (obstruction plate). In this case, when the stirring blade assembly 10 operates and rotates, it is possible to prevent the liquid Q1 from rotating together.

A stirring blade assembly 10 is installed in the tank 9. The stirring blade assembly 10 is used for stirring the liquid Q1 and the particles Q2. The stirring blade assembly 10 includes a rotating shaft 11 parallel to the vertical direction, a first stirring blade 1 supported by the rotating shaft 11, and a second stirring blade 1 supported by the rotating shaft 11 above the first stirring blade 1. A blade 2A and a second stirring blade 2B are provided.

The rotary shaft 11 is connected to the drive unit 12 on the lower side thereof.
The drive unit 12 is a drive source that rotates the rotating shaft 11 together with the first stirring blade 1, the second stirring blade 2A, and the second stirring blade 2B in the arrow α direction, and has, for example, a motor. The rotation speed of the rotating shaft 11 by the drive unit 12 is, for example, preferably 30 rpm or more and 300 rpm or less, and more preferably 40 rpm or more and 250 rpm or less. As a result, the first flow FL1 and the second flow FL2, which will be described later, can be generated in just proportion.

A first stirring blade 1 is provided on the bottom 91 side of the tank 9. As shown in FIGS. 1 and 2, the first stirring blade 1 has a boss 3 and two plate-shaped members 4 cantilevered and supported by the boss 3. The number of plate-shaped members 4 included in the first stirring blade 1 is not limited to two in the present embodiment, and may be, for example, one or three or more.

The boss 3 has a cylindrical shape, and a rotating shaft 11 is inserted inside the boss 3. The boss 3 is fixed to the rotating shaft 11. As a result, the first stirring blade 1 is rotatably supported around the rotation shaft 11. The method of fixing the boss 3 is not particularly limited, and for example, a method by welding, a method by screwing, or the like can be used.

Each plate-shaped member 4 projects in a direction intersecting the rotation axis 11 (in the present embodiment, a direction orthogonal to each other). The plate-shaped members 4 project in opposite directions with each other via the boss 3 (rotational shaft 11).
Further, each plate-shaped member 4 has a flat plate shape arranged in parallel with the vertical direction.
When the first stirring blade 1 is rotated by such a plate-shaped member 4, the liquid Q1 collides with the side wall portion 92 from the direction away from the rotation shaft 11 and hits the side wall portion 92. A first flow FL1 (see FIG. 6) can be generated along it upwards.

Each plate-shaped member 4 has a rotating shaft 11 at an end opposite to the rotating shaft 11, that is, an inclined portion 41 inclined at an inclination angle θ ₄₁ with respect to the vertical direction. In the process of generating the first flow FL1 in the liquid Q1 by the inclined portion 41, it is possible to alleviate the collision at the time of the collision with the side wall portion 92 described above. Thereby, for example, it is possible to sufficiently secure the upward flow along the side wall portion 92 after the collision with the side wall portion 92, and thus the first flow FL1 can be stably generated. Further, the liquid Q1 is discharged obliquely upward from the inclined portion 41, and the liquid Q1 promotes the upward flow along the side wall portion 92. The inclination angle θ ₄₁ is not particularly limited, but is preferably, for example, 30 ° or more and 60 ° or less, and more preferably 40 ° or more and 50 ° or less. As a result, the collision with the side wall portion 92 is alleviated without excess or deficiency.

Further, each plate-shaped member 4 has a curved portion 42 curved along a rounded bottom portion 91 at the lower portion. As a result, the gap between each plate-shaped member 4 and the bottom portion 91 can be made as small as possible, thereby preventing the flow generated between each plate-shaped member 4 and the bottom portion 91 from obstructing the first flow FL1. can do.

A second stirring blade 2A and a second stirring blade 2B are provided (arranged) above the first stirring blade 1 along the vertical direction. Such a configuration is suitable for a tank 9 having a ratio H / D _{92 in} the range of 1 or more and 1.2 or less, and convection CV described later can be stably generated in the tank 9.

Of the second stirring blade 2A and the second stirring blade 2B, the second stirring blade 2A is arranged on the lower side, and the second stirring blade 2B is arranged on the upper side. Further, the second stirring blade 2A and the second stirring blade 2B are separated from each other, and the separation distance SD is within the range of 0.3 times or more and 0.5 times or less of the diameter φD ₂ of the second stirring blade 2A. is there.
Since the second stirring blade 2A and the second stirring blade 2B have the same configuration except that the arrangement location is different, the second stirring blade 2A will be described as a representative.

As shown in FIG. 1, the second stirring blade 2A is separated from the first stirring blade 1, and has a boss 5, a first protruding portion 6 cantilevered by the boss 5, and each first protruding portion 6. It has a cantilevered second protrusion 7 on the opposite side of the boss 5. When the second stirring blade 2A rotates, the liquid Q1 can generate a second flow FL2 (see FIG. 6) that moves vertically downward while moving away from the rotating shaft 11.

The boss 5 has a cylindrical shape, and a rotating shaft 11 is inserted inside the boss 5. The boss 5 is fixed to the rotating shaft 11. As a result, the second stirring blade 2A is rotatably supported around the rotation shaft 11. As a method of fixing the boss 5, as shown in FIG. 3, a method by welding is used in the present embodiment. The welded portion 13 is provided at the boundary between the boss 5 and the rotating shaft 11.

Each first protruding portion 6 projects in a direction intersecting the rotation axis 11 (in the present embodiment, a direction orthogonal to each other). The first protruding portions 6 project toward each other in opposite directions via the boss 5 (rotational shaft 11).
Further, each first protruding portion 6 is composed of a first plate-shaped member having a flat plate shape. As shown in FIG. 4, each first protruding portion 6 is inclined at an inclination angle θ ₆ with respect to the horizontal direction. As a result, when the second stirring blade 2 rotates, a vertically downward flow FL2-1 (see FIG. 6) can be generated with respect to the liquid Q1. The inclination angle θ ₆ is not particularly limited, but is preferably 15 ° or more and 75 ° or less, and more preferably 30 ° or more and 60 ° or less. As a result, the flow FL2-1 can be generated in just proportion.

The width (average width) W ₆ of the first protrusion ₆ is smaller than the width (average width) W ₄ of the plate-shaped member 4 of the first stirring blade 1, and is, for example, 5% or more and 50% or less of the width W _4. is there.
In the present embodiment, each first protruding portion 6 is composed of a flat plate-shaped member, but the present invention is not limited to this, and each first protruding portion 6 may be composed of a prismatic member.

A second protrusion 7 is arranged at the end of each first protrusion 6. The distance between the second protrusions 7 gradually increases vertically downward. That is, each of the second projecting portions 7 projects obliquely downward from the first projecting portion 6. As a result, a diagonally downward flow of the second flow FL2 can be formed, and a flow that draws the flow of the liquid Q1 away from the rotating shaft 11 toward the rotating shaft 11 is generated, so that the first flow FL1 (upward flow) It becomes difficult to obstruct the flow of. The inclination angle θ _7-1 of the second protruding portion 7 with respect to the rotation axis 11 is not limited to, but is preferably 5 ° or more and 60 ° or less, and more preferably 10 ° or more and 30 ° or less. preferable.

Here, if each of the second projecting portions 7 projects directly below the first projecting portion 6, that is, vertically downward, the flow of the liquid Q1 does not flow only directly below (vertically downward), but rather the second There is a possibility of pulling in one flow FL1. On the other hand, when the first protruding portion 6 is shortened so as not to draw in the first flow FL1, stirring occurs only around the rotation shaft 11, and sufficient stirring cannot be achieved.

Further, each second protruding portion 7 is composed of a second plate-shaped member having a flat plate shape. As shown in FIG. 5, each second protrusion 7 is inclined with respect to the tangential TA direction at the second protrusion 7 of the virtual circle CL that is centered on the rotation axis 11 and passes through each second protrusion 7. It is tilted at an angle θ _7-2 . As a result, when the second stirring blade 2 rotates, a flow FL2-2 (see FIG. 6) is generated for the liquid Q1 from the direction away from the rotation shaft 11 and then toward the rotation shaft 11. Can be done. The inclination angle θ _7-2 is not particularly limited, but is preferably 5 ° or more and 75 ° or less, and more preferably 30 ° or more and 60 ° or less. As a result, the flow FL2-2 can be generated in just proportion, coupled with the fact that the second protruding portion 7 protrudes diagonally downward from the first protruding portion 6 at an inclination angle θ _7-1 .

Then, as shown in FIG. 6, the second flow FL2 is generated by the synthesis of the flow FL2-1 and the flow FL2-2.
The first flow FL1, the second flow FL2, the flow FL2-1, and the flow FL2-2 are, for example, various fluid simulations using computational fluid dynamics (abbreviation: CFD), and others. It can be visualized and confirmed by fluid experiments and the like.

In the stirring tank 100, the diameter φD ₂ of the second stirring blade 2A is smaller than the diameter φD ₁ of the first stirring blade 1, and is preferably 30% or more and 100% or less of the diameter φD ₁ , for example, 50% or more. More preferably, it is 80% or less. As a result, the second flow FL2 becomes difficult to join the first flow FL1, and thus the flow does not interfere with the first flow FL1. Then, the first flow FL1 and the second flow FL2 can stably generate a convection CV that descends in the vicinity of the rotation shaft 11 and rises in the vicinity of the side wall portion 212. By this convection CV, the liquid Q1 and the grain Q2 having different specific gravities can be agitated, and the liquid Q1 and the grain Q2 can be uniformly mixed without breaking the grain Q2 (without crushing). Then, after the mixture Q3 is discharged from the tank 9, it is transferred to the next step, stored in a commercial container, for example, and ready for sale.

Consider the case where the mixed state of the liquid Q1 and the grain Q2 having different specific gravities is non-uniform, that is, there is uneven mixing. In this case, when discharged from the tank 9, the material having a lighter specific gravity is discharged later than the material having a heavier specific gravity. For example, when the liquid Q1 has a lighter specific gravity and the grain Q2 has a heavier specific gravity, the grain Q2 is more in the product container manufactured earlier, and the grain Q2 is in the product container manufactured later. The number is low, which is not preferable in terms of quality. On the contrary, when the grain Q2 has a lighter specific gravity and the liquid Q1 has a heavier specific gravity, the inside of the product container manufactured earlier has less grain Q2, and the inside of the product container manufactured later has less. , The number of grains Q2 is large, which is also not preferable in terms of quality.

On the other hand, in the stirring tank 100, for example, when liquids Q1 and grains Q2 having different specific gravities are mixed, the mixture Q3 can be produced in a uniform mixed state. As a result, the mixture Q3 in which the ratio of the liquid Q1 and the grains Q2 is constant is formed in each product container regardless of the order of the product containers to be manufactured, which is preferable in terms of quality.

As described above, each second protrusion 7 is cantilevered and supported. As a result, the centrifugal force acting on each of the second protruding portions 7 changes depending on the rotation speed of the rotating shaft 11, and the inclination angle θ _7-1 also changes with this change. When the inclination angle θ _7-1 changes, the flow FL2-2 also changes. Therefore, the second flow FL2 can be adjusted according to the rotation speed of the rotating shaft 11.

Further, the width (mean width) W ₇ of the second protruding portion 7 (second plate-shaped member) is smaller than the width W ₆ of the first protruding portion 6 (first plate-shaped member), for example, the width W. _It is preferably 20% or more and 80% or less, and more preferably 40% or more and 60% or less of 6. As a result, for example, the magnitude relationship between the size of the flow FL2-1 generated by the first protrusion 6 and the size of the flow FL2-2 generated by the second protrusion 7 causes the second flow FL2 to be generated in just proportion. It becomes a big and small relationship to the extent that it makes you. Further, since the second protruding portion 7 is cantilevered and supported by the first protruding portion 6, the relationship of "width W ₇ <width W ₆ " also has a second aspect in terms of the load applied to the second protruding portion 7. In terms of the strength of the stirring blade 2A and the second stirring blade 2B, it is preferable that the width W ₇ becomes smaller and the load becomes smaller as the distance from the rotating shaft 11 increases. As a result, the plate thickness of the flat plate of the second protruding portion 7 and the first protruding portion 6 can be reduced, and there is an advantage that the cantilever connecting portion (support portion) can be easily connected.

<Second Embodiment>
FIG. 7 is a side view showing a second embodiment of the stirring tank of the present invention.
Hereinafter, the second embodiment of the stirring blade assembly and the stirring tank of the present invention will be described with reference to this figure, but the differences from the above-described embodiments will be mainly described, and the same matters will be omitted. To do.
The present embodiment is the same as the first embodiment except that the number of arrangements of the second stirring blades is different.

As shown in FIG. 7, in the present embodiment, the stirring blade assembly 10 includes the second stirring blade 2A, the second stirring blade 2B, the second stirring blade 2C, and the second stirring blade 2D arranged in order from the lower side. Be prepared. Such a configuration is suitable for a tank 9 having a ratio H / D _{92 in} the range of 1.7 or more and 2.2 or less, and convection CV can be stably generated in the tank 9.
When the second stirring blade 2D is omitted, it is suitable for the tank 9 having a ratio H / D _{92 in} the range of 1.2 or more and 1.7 or less.

<Third Embodiment>
FIG. 8 is a side view showing a stirring blade assembly provided in the stirring tank (third embodiment) of the present invention.
Hereinafter, the third embodiment of the stirring blade assembly and the stirring tank of the present invention will be described with reference to this figure, but the differences from the above-described embodiments will be mainly described, and the same matters will be omitted. To do.
The present embodiment is the same as the second embodiment except that the configuration of the second stirring blade is different.

As shown in FIG. 8, in the present embodiment, the second stirring blade 2A, the second stirring blade 2B, the second stirring blade 2C, and the second stirring blade 2D all have one first protruding portion 6 and the same. It has a second protruding portion 7 supported by the first protruding portion 6.
The protruding directions of the first protruding portions 6 of the second stirring blade 2A and the second stirring blade 2C are the same.

The protruding direction of the first protruding portion 6 of the second stirring blade 2B and the second stirring blade 2D is also the same direction, but the protruding direction of the first protruding portion 6 of the second stirring blade 2A and the second stirring blade 2C. It is in the opposite direction.
Compared to the stirring blade assembly 10 in the second embodiment, such a stirring blade assembly 10 can suppress the size of the second flow FL2 even at the same rotation speed, for example, grains. This configuration is effective when Q2 is easily collapsed.

<Fourth Embodiment>
FIG. 9 is a vertical cross-sectional view showing a stirring blade assembly provided in the stirring tank (fourth embodiment) of the present invention.
Hereinafter, the fourth embodiment of the stirring blade assembly and the stirring tank of the present invention will be described with reference to this figure, but the differences from the above-described embodiments will be mainly described, and the same matters will be omitted. To do.
The present embodiment is the same as the first embodiment except that the configuration of the second stirring blade is different.

As shown in FIG. 9, in the present embodiment, the boss 5 of the second stirring blade 2A is fixed to the rotating shaft 11 by screwing. A female screw 51 is formed through the boss 5. A screw 14 is screwed into the female screw 51. The screw 14 is engaged with a recess 111 formed on the outer peripheral portion of the rotating shaft 11. As a result, the boss 5 can be fixed to the rotating shaft 11, and the boss 5 is also positioned with respect to the rotating shaft 11.

Although the stirring blade assembly and the stirring tank of the present invention have been described above with respect to the illustrated embodiment, the present invention is not limited to this, and the parts constituting the stirring blade assembly and the stirring tank are the same. It can be replaced with any configuration that can exert its function. Moreover, an arbitrary composition may be added.
Further, the stirring blade assembly and the stirring tank of the present invention may be a combination of any two or more configurations (features) in each of the above embodiments.

Further, the stirring tank (stirring blade assembly) is applied to mixing the pulp grains and the fruit juice in each of the above-described embodiments, but is not limited to this, for example, when mixing materials having different specific gravities. If there is, the application mode is not limited. For example, in the case of food, a stirring tank can be applied when mixing nata de coco grains and liquid yogurt. In addition, the stirring tank can also be applied when metal powder is mixed with oil, or when clay or limestone is mixed with water to obtain a slurry such as cement.

Further, the rotation direction of the first stirring blade and the rotation direction of the second stirring blade are the same in each of the above-described embodiments, but are not limited to this, and may be in opposite directions to each other, for example. In this case, the rotating shaft can be composed of two concentrically arranged members.
Further, the rotation speed of the first stirring blade and the rotation speed of the second stirring blade are the same in each of the above-described embodiments, but are not limited to this, and may be different, for example.

Further, the plurality of second stirring blades have the same rotation speed in each of the above embodiments, but the rotation speed is not limited to this, and the rotation speed may be gradually decreased or increased upward.
Further, the plurality of second stirring blades have the same diameter in each of the above-described embodiments, but the diameter is not limited to this, and the diameter may be gradually reduced toward the upper side.

100 Stirring tank 10 Stirring blade assembly 1 1st stirring blade 2A, 2B 2nd stirring blade 3 Boss 4 Plate-shaped member 41 Inclined part 42 Curved part 5 Boss 51 Female screw 6 1st protruding part 7 2nd protruding part 9 Tank 91 Bottom 92 Side wall 93 Space 11 Rotating shaft 111 Recess 12 Drive 13 Welded 14 Screw CL Virtual circle CV Convection φD ₁ Diameter φD ₂ Diameter φD ₉₂ Inner diameter H Height FL1 1st flow FL2 2nd flow FL2-1 Flow FL2- 2 Flow LS Liquid level TA Welding SD Separation distance Q1 Liquid Q2 Grains Q3 Mixture W ₄ Width (mean width)
W ₆ width (mean width)
W ₇ width (mean width)
α Arrow θ ₄₁ Tilt angle θ ₆ Tilt angle θ _7-1 Tilt angle θ _7-2 Tilt angle

Claims (11)

A stirring blade assembly having a bottom portion and a side wall portion, which is installed in a tank for storing a liquid and used for stirring the liquid.
It is provided on the bottom portion and is rotatably supported around a rotation axis parallel to the vertical direction. When rotated, the liquid is directed away from the rotation axis and then upward along the side wall portion. The first stirring blade that produces the first flow and
A second stirring blade provided above the first stirring blade is provided.
The second stirring blade is rotatably supported around the rotation axis, and when rotated, the second stirring blade moves vertically downward with respect to the liquid while moving away from the rotation axis, and does not obstruct the first flow. A stirring blade assembly characterized by producing two flows. The stirring blade assembly according to claim 1, wherein the diameter of the second stirring blade is smaller than the diameter of the first stirring blade. The second stirring blade has a boss and
A first protruding portion that is cantilevered by the boss and protrudes in a direction intersecting the rotation axis.
The stirring blade assembly according to claim 1 or 2, further comprising a second protruding portion that is cantilevered and supported on the side of the first protruding portion opposite to the boss and protrudes downward. The first protruding portion is composed of a first plate-shaped member having a plate shape inclined with respect to the horizontal direction.
The stirring according to claim 3, wherein the second protruding portion is composed of a second plate-shaped member having a plate-like shape centered on the rotation axis and inclined with respect to the tangential direction of a circle passing through the second protruding portion. Blade assembly. The stirring blade assembly according to claim 4, wherein the width of the second plate-shaped member is smaller than the width of the first plate-shaped member. According to any one of claims 3 to 5, two first protrusions are arranged via the rotation shaft, and the second protrusions are arranged in the two first protrusions, respectively. The stirring blade assembly described. The stirring blade assembly according to claim 6, wherein the distance between the second protrusions gradually increases vertically downward. The stirring blade assembly according to any one of claims 1 to 7, wherein a plurality of the second stirring blades are arranged along the vertical direction. The stirring blade assembly according to any one of claims 1 to 8, wherein the first stirring blade has a plate-shaped member that protrudes in a direction intersecting the rotation axis and is arranged in parallel with the vertical direction. Three-dimensional. The stirring blade assembly according to claim 9, wherein the plate-shaped member has an end portion opposite to the rotating shaft that is inclined with respect to the rotating shaft. A tank that has a bottom and stores liquid,
A stirring tank installed in the tank and comprising the stirring blade assembly according to any one of claims 1 to 10, which is used for stirring the liquid.

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